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Thursday, May 18, 2023

Human rights in Bangladesh

From Wikipedia, the free encyclopedia

https://en.wikipedia.org/wiki/Human_rights_in_Bangladesh

Human rights in Bangladesh are enshrined as fundamental rights in Part III of the Constitution of Bangladesh. However, constitutional and legal experts believe many of the country's laws require reform to enforce fundamental rights and reflect democratic values of the 21st century.

In 2022, Freedom House rated Bangladesh’s human rights at 37 out 100 (partly free).

Overview

Reforms were proposed in 2017 and included strengthening parliamentary supremacy, judicial independence, the separation of powers, repealing laws which restrain freedom of the press and disbanding security agencies which violate civil liberties.

Even though Bangladesh has Islam as its state religion and has constitutional references to Hindus, Christians and Buddhists, the political system is modeled as a secular democracy. Governments have generally respected freedom of religion, a cornerstone of the Bangladeshi constitution. However, the police have been slow in responding to and investigating attacks against minorities, opposition activists & supporters and purportedly brutally suppress lawful protest against the government. According to Human Right Watch, around five hundred people have been disappeared since last ten years. In southeastern Bangladesh, the Chittagong Hill Tracts remains a militarized region due to a historical insurgency. Tribal people in Bangladesh have demanded constitutional recognition.

According to Dr. Mizanur Rahman, the former chairman of the National Human Rights Commission, 70% of allegations of human rights violations are against law enforcement agencies (2015). Torture and enforced disappearances are rampantly employed by Bangladeshi security forces. In recent years, free speech and media freedom have been repressed by the government through laws regulating newspapers, TV channels and the internet. Elected MPs in parliament lack voting freedoms. The future of elections is a concern among the population, with opposition parties alleging free and fair elections are not possible under the incumbent government. Local government elections in 2015 were marred by widespread allegations of vote rigging.

According to Professor M Nazrul Islam Tamiji, the chairman of National Human Rights Society Bangladesh, we can ensure human rights through the speed of liberation war 1971.

Capital punishment remains legal in Bangladesh. Worker's rights are effected by a ban on trade unions in special economic zones. The government has often targeted trade union leaders for persecution. The people have the right to enjoy their own culture, to profess and practice and practise their own religion, and to use their own language in both private and publics spheres (Article 2 (1))

Citizenship and minority rights

Non-Bengalis

Non-Bengali minorities are often culturally and politically discriminated in the country. Article 23A of the constitution goes on to describe minorities as "tribes" and "minor races", notably the Chakmas, Biharis, Garos, Santhals, Marmas, Manipuris, Tripuris, Tanchangyas, Bawms. Article 6 of the constitution, which proclaims "the people of Bangladesh shall be known as Bangalees as a nation", was criticized for discrimination against the country's significant non-Bengali population. Chakma politician Manabendra Narayan Larma addressed it during proceedings of the constituent assembly of Bangladesh in 1972, famously proclaimed that "Under no definition or logic can a Chakma be a Bengali or a Bengali be a Chakma....As citizens of Bangladesh, we are all Bangladeshis, but we also have a separate ethnic identity, which unfortunately the Awami League leaders do not want to understand".

Refugees

The substantial Bihari population also complain of discrimination. In 2008, the Dhaka High Court granted citizenship to the stateless Stranded Pakistani community.

Bangladesh has been criticized for the poor living conditions in which over Rohingya refugees from Myanmar are kept in the country's southeast. There was international outcry after the army and government planned to relocate refugee camps to a remote island in the Bay of Bengal. There were an estimated 22,000 registered refugees and over 100,000 unregistered refugees until 2016. Following the 2016-present Rakhine State crackdown, 1.5 million refugees entered Bangladesh from Myanmar.

Bangladesh has not signed the 1951 Convention Relating to the Status of Refugees.

Persecution of non-Muslims

List of massacre targeted at Hindus and Buddhists minorities, mainly by radical Islamists:

Persecution of minority Muslims

Different denominational minority Muslim groups are often targeted by the dominant Sunnis for sectarian violence, such as Ahmadiyya and Shia community of the country. In 2004, the Government of Bangladesh banned all religious texts of the Ahmadiyya community. In 2015, a Shi'ite Ashura gathering was bombed.

Labour rights

The constitution's proclamation of a People's republic and socialism in its preamble and Article 10 are at odds with Bangladesh's current free market economy system, entrepreneurial class, diverse corporate sector and owners of private property. Six general elections were won by pro-market political parties, while four elections were won by left-wing parties.

Bangladesh ranked 128th out of 178 countries in the 2017 Index of Economic Freedom.

In spite of Article 38 calling for freedom of association, trade union leaders from the textile industry often face arbitrary arrests and politically motivated lawsuits. Forming trade unions is banned in export processing zones (EPZs), but the government has pledged to remove the ban.

Forced labours

Forced labor is prohibited under Article 34, but Bangladesh has significant challenges of human trafficking and modern slavery. Child labour is common in the country, with 4.7 million children aged 5 to 14 in the work force. 93% of child labourers are employed in the informal sector such as small factories and workshops, on the street, in home-based businesses and domestic employment. In 2006, Bangladesh passed a Labor Law setting the minimum legal age for employment as 14.

Freedom of speech

Free speech is enshrined under Article 39. During the 1990s and first decade and a half of the 21st century, the Bangladeshi media enjoyed more freedom than at any other time in history. However, since the 2014 election in which the incumbent Awami League won a boycotted election, the freedom of the press has dramatically declined. The ruling party has targeted the country's two leading newspapers The Daily Star and Prothom Alo with numerous lawsuits and has encouraged businesses to stop advertising in them. Pro-opposition journalists Mahmudur Rahman and Shafik Rehman were detained for prolonged periods. Nurul Kabir, editor of the New Age, has faced threats to personal life. Mahfuz Anam, editor of The Daily Star, has faced 83 lawsuits since 2016. Reporters without Borders ranked Bangladesh at 146th out of 180 countries in its index of press freedom.

According to Amnesty International, independent media outlets and journalists have come under severe pressure by the government. Several journalists faced arbitrary criminal charges, often for publishing criticism of Prime Minister Sheikh Hasina, her family or the Awami League Government. Journalists reported increased threats from governmental officials or security agencies. The government continued to use a range of repressive laws to restrict the right to freedom of expression extensively. It increasingly used the Information and Communications Technology Act which arbitrarily restricted online expression. The human rights organization Odhikar reported increased arrests under the Act. Journalists, activists, and others were targeted. Dilip Roy, a student activist, was detained for criticizing the Prime Minister on Facebook, but later released on bail. Parliament adopted the Foreign Donations (Voluntary Activities) Regulation Act which significantly increased government control over the work of NGOs and threatened them with deregistration for making “inimical” or “derogatory” remarks against the Constitution or constitutional bodies. Several other bills that threatened freedom of expression were proposed in parliament, including the Digital Security Act and the Liberation War Denial Crimes Act.

The government has also been slow to investigate attacks on secularists in Bangladesh.

On 20 June 2020, a 15-year-old child was arrested by Bangladeshi authority for criticizing Prime Minister Sheikh Hasina Wazed in a Facebook post. The child was arrested under Digital Security Act. He was sent to a juvenile detention center. Human Rights Watch urged the Bangladeshi government to order their police force not to arrest people for criticizing the government and release all children held in juvenile detention facilities and prisons for petty crimes. According to Human Rights Watch, Bangladeshi authorities are perpetually detaining journalist, activist and government's critics under misuse of Digital Security Act. People are being detained for posting social media comments against the ruling party. HRW urged the authority to release detainees who were held under DSA for criticizing the government.

Article 11 proclaims that "the Republic shall be a democracy in which fundamental human rights and freedoms and respect for the dignity and worth of the human person shall be guaranteed". The government enacted the anti-torture law, called Torture and Custodial Death (Prevention) Act, in 2013. However, torture is widely used by Bangladeshi security forces, including the police, paramilitary and military. In 2017, the police asked the prime minister to scrap the anti-torture law.

Although there is general freedom of assembly in Bangladesh, the political opposition is often restricted from holding public meetings and rallies by the government.

On 3 January 2019, Human Rights Watch called for an investigation on attack on members of the opposition party on and before Bangladesh elections.

Democracy

Elections

In 2011, the Awami League-led parliament abolished the caretaker government of Bangladesh, which was intended to act as a neutral guarantor during general elections. The opposition Bangladesh Nationalist Party maintains that free and fair elections are not possible under the incumbent Awami League government, particularly after the League amended the constitution to have a sitting parliament while elections take place, in contradiction of Westminster norms.

In 2015, local government elections were marred by allegations of vote rigging and intimidation of voters and the media. Opposition parties have demanded a neutral interim government during the election period. In response, the government has proposed to restrict its political activities while organizing and holding elections.

Free votes

Parliament is not allowed to have free votes due to Article 70

Article 70 of the Constitution of Bangladesh is described as one of the most significant constraints on Bangladesh's democracy. The article restricts free votes in parliament. This means MPs have no voting freedom. According to the article, MPs will lose their seats if they vote against their party. Critics have argued the article tramples free speech in parliament itself. As a result, parliament has been termed a rubber stamp and a lame duck.

Emergency powers

Part IXA of the constitution concerns a state of emergency. Emergency powers were increased in the second amendment. Three emergency periods have been declared in Bangladesh's history, including in 1973, 1990 and 2007. Article 141 (B) and Article 141 (C) allows for the suspension of fundamental rights during an emergency period. The articles have been strongly criticized. In January 2007, when the 2006-2008 Bangladeshi political crisis saw a declaration of emergency rule, the New Age stated in an editorial "...by declaring a state of emergency to undo his mistakes, it is once again the people that the president is hurting by suspending their fundamental democratic rights. The citizens are not at fault for the existing political situation and therefore should not be punished for the failures of the caretaker government and the political parties. The president, therefore, should immediately restore the fundamental rights of the citizens."

Law and justice

Extrajudicial killings

Members of the Rapid Action Battalion

Article 32 proclaims "no person shall be deprived of life or personal liberty save in accordance with law". In reality, Bangladesh has a number of extrajudicial killings and enforced disappearances each year. The Rapid Action Battalion is accused of being the leading perpetrator of such human rights abuses, followed by the Bangladesh Police, the Directorate General of Forces Intelligence and the Bangladesh Army.

Capital punishment

Capital punishment remains legal in Bangladesh. There has been three executions in the country in 2015, and one in 2016 (as of July 5, 2016). It can theoretically be applied to anyone over the age of 16, but in practice is not applied to those under 18.

The death penalty may be used as a punishment for crimes such as murder, sedition, offences related to possession of or trafficking in drugs, offences related to trafficking in human beings, treason, espionage, military crimes, rape, hijacking planes, sabotage, or terrorism. It is carried out by hanging and firing squad; authorities usually use only hanging.

Bangladesh is not a state party to the Second Optional Protocol to the International Covenant on Civil and Political Rights on abolishing the death penalty.

Bangladesh's Law Minister Anisul Huq proposed a law on behalf of the government under which the highest form of punishment would be imposed on those accused of rape. The decision followed public outrage over the video of a woman circulated online showing a group of men sexually assaulting her. It was later found that the girl was also repeatedly gang raped by the same men.

Women rights

The United Nations country team in Bangladesh has identified "marital instability" as the key cause of poverty and "ultra and extreme" poverty among female-headed households. The Bangladesh Planning Commission has said that women are more susceptible to becoming poor after losing a male earning family member due to abandonment or divorce. Women in Bangladesh are especially vulnerable to a form of domestic violence known as acid throwing, in which concentrated acid is thrown onto an individual (usually at the face) with the aims of extreme disfiguration and social isolation. In Bangladesh, women are discriminately targeted: according to one study, from 1999 to 2009, 68% of acid attack survivors were women/girls.

In 2010, a law against domestic violence was introduced, which defines causing "economic loss" as an act of domestic violence and recognises the right to live in the marital home. The law also empowers courts to provide temporary maintenance to survivors of domestic violence. In 2012, the Law Commission of Bangladesh, supported by the Ministry of Law, Justice and Parliamentary Affairs, completed nationwide research into reforms for Muslim, Hindu, and Christian personal laws. In May 2012, the cabinet approved a bill for optional registration of Hindu marriages. The Ministry of Law, Justice and Parliamentary Affairs is also considering reforms to civil court procedures—especially on issuance of summons that will improve family court efficiency.

Bangladesh has a high rate of early marriages. The government had vowed to end marriage of children younger than 15 by 2021. But in February 2017, a law was passed that permits girls less than 18 years of age to marry under “special circumstances,” such as “accidental” or “illegal pregnancy,” with permission from their parents and court.

LGBT rights

In 2014, the Bangladeshi government officially recognized hijras as a third gender.

The British Raj-era penal code remains in force in Bangladesh. Section 377 of the code criminalizes homosexuality. In 2016, Terrorist groups claimed responsibility for the murders of Bangladesh's first LGBTQ magazine editor Xulhaz Mannan and his partner Tanay Majumdar.

Corruption

In 2017, Bangladesh scored a 28 out of 100 (0 being highly corrupt and 100 being clean), in the “Corruption Perceptions Index” by Transparency International, and ranked the 143rd most corrupt out of 180 nations. In 2016, they scored 16, and in 2015 they scored a 25.

The Anti Corruption Commission was founded in 2004 in hopes of relieving some corruption in Bangladesh, but was ineffective. After the Bangladesh Nationalist Party lost power in 2006 after their term ended, the corruption in Bangladesh continued to worsen due to poor governance until 2008 when the caretaker government stepped in to resolve some of the issues present. In 2018, corruption can be found in hospitals, laboratories, and pharmacies in the form of bribery. In 2018 alone, it is estimated that 10,688 TK has been treated through bribery. Over 66% of homes claimed to be victims of corruption in the service industries. Corruption is also found in law enforcement, where over 72% of homes claimed to be victims of corruption in regards to law enforcement. Those who fell victim to corruption found that the most commonly corrupt officials were in law enforcement and passport offices, needing bribes in order to have your claims processed. In addition to bribery, corruption also exists in the forms of lobbying, in the gas industry, in education, water supply, electricity industries, and in many other major industries. Bribery is an underlying theme, linking the problems together. Slave labor is also quite common in Bangladesh, with over 1.5 million people being forced into labor, directly breaking the prohibition on forced labor. 85% of the slaves are male, and 15% are female, making Bangladesh rank 4th in terms of slave count in the world, only being topped by India, China and Pakistan. Most men work in labor industries like farming or construction, while many women and young girls are enslaved in brothels. Linking back in to bribery, brothel owners have been found to bribe the police to convince them that the children are at least 18, the legal age to work as a sex worker in Bangladesh. These women and girls make very little money, as the brothel owners keep most of the profits. Less than 10% of sex workers in Bangladesh have entered the field on their own will, as most of them have been sold or forced into slavery, having to pay off their debts to their owners before becoming free.

Stealth aircraft

From Wikipedia, the free encyclopedia

https://en.wikipedia.org/wiki/Stealth_aircraft

F-117 Nighthawk, the first operational aircraft specifically designed around stealth technology.

Stealth aircraft are designed to avoid detection using a variety of technologies that reduce reflection/emission of radar, infrared, visible light, radio frequency (RF) spectrum, and audio, collectively known as stealth technology. The F-117 Nighthawk was the first operational aircraft specifically designed around stealth technology. Other examples of stealth aircraft include the B-2 Spirit, the B-21 Raider, the F-22 Raptor, the F-35 Lightning II, the Chengdu J-20, and the Sukhoi Su-57.

While no aircraft is totally invisible to radar, stealth aircraft make it more difficult for conventional radar to detect or track the aircraft effectively, increasing the odds of an aircraft successfully avoiding detection by enemy radar and/or avoiding being successfully targeted by radar guided weapons. Stealth is the combination of passive low observable (LO) features and active emitters such as low-probability-of-intercept radars, radios and laser designators. These are usually combined with active measures such as carefully planning all mission maneuvers in order to minimize the aircraft's radar cross-section, since common actions such as hard turns or opening bomb bay doors can more than double an otherwise stealthy aircraft's radar return. It is accomplished by using a complex design philosophy to reduce the ability of an opponent's sensors to detect, track, or attack the stealth aircraft. This philosophy also takes into account the heat, sound, and other emissions of the aircraft as these can also be used to locate it. Sensors made to reduce the impact of current low observable technologies exist or have been proposed such as IRST (infrared search and track) systems to detect even reduced heat emissions, long wavelength radars to counter stealth shaping and RAM focused on shorter wavelength radar, or radar setups with multiple emitters to counter stealth shaping. However these do so with disadvantages compared to traditional radar against non-stealthy aircraft.

Full-size stealth combat aircraft demonstrators have been flown by the United States (in 1977), Russia (in 2000) and China (in 2011). As of December 2020, the only combat-ready stealth aircraft in service are the Northrop Grumman B-2 Spirit (1997), the Lockheed Martin F-22 Raptor (2005); the Lockheed Martin F-35 Lightning II (2015); the Chengdu J-20 (2017), and the Sukhoi Su-57 (2020), with a number of other countries developing their own designs. There are also various aircraft with reduced detectability, either unintentionally or as a secondary feature.

In the 1999 NATO bombing of Yugoslavia two stealth aircraft were used by the United States, the veteran F-117 Nighthawk, and the newly introduced B-2 Spirit strategic stealth bomber. The F-117 performed its usual role of striking precision high-value targets and performed well, although one F-117 was shot down by a Serbian Isayev S-125 'Neva-M' missile brigade commanded by Colonel Zoltán Dani.

Background

World War I and World War II

The Linke-Hofmann R.I prototype, an experimental German World War I bomber covered with transparent covering material (1917–1918)

During World War I, the Germans experimented with the use of Cellon (Cellulose acetate), a transparent covering material, in an attempt to reduce the visibility of military aircraft. Single examples of the Fokker E.III Eindecker fighter monoplane, the Albatros C.I two-seat observation biplane, and the Linke-Hofmann R.I prototype heavy bomber were covered with Cellon. However, it proved ineffective, and even counterproductive, as sunlight glinting from the covering made the aircraft even more visible. The material was also found to be quickly degraded both by sunlight and in-flight temperature changes, so the attempt to make transparent aircraft was not proceeded with.

In 1916, the British modified a small SS class airship for the purpose of night-time aerial reconnaissance over German lines on the Western Front. Fitted with a silenced engine and a black gas bag, the craft was both invisible and inaudible from the ground, but several night-time flights over German-held territory produced little useful intelligence, and the idea was dropped.

Nearly three decades later, the Horten Ho 229 flying wing fighter-bomber was developed in Nazi Germany during the last years of World War II. In 1983, its designer Reimar Horten claimed that he planned to add charcoal to the adhesive layers of the plywood skin of the production model to render it invisible to radar. This claim was investigated, as the Ho 229's lack of vertical surfaces, an inherent feature of all flying wing aircraft, is also a key characteristic of all stealth aircraft. Tests were performed in 2008 by the Northrop-Grumman Corporation to establish if the aircraft's shape would have avoided detection by top-end HF-band, 20–30 MHz primary signals of Britain's Chain Home early warning radar, if the aircraft was traveling at high speed (approximately 550 mph (890 km/h)) at extremely low altitude – 50–100 feet (15–30 m). The testing did not find any evidence that charcoal was used, and confirmed that it would have been a poor absorber if used, concluding that the Ho 229 did not have stealth characteristics and was never intended to be a stealth aircraft.

Modern era

Modern stealth aircraft first became possible when Denys Overholser, a mathematician working for Lockheed Aircraft during the 1970s, adopted a mathematical model developed by Petr Ufimtsev, a Soviet scientist, to develop a computer program called Echo 1. Echo made it possible to predict the radar signature of an aircraft made with flat panels, called facets. In 1975, engineers at Lockheed Skunk Works found that an aircraft made with faceted surfaces could have a very low radar signature because the surfaces would radiate almost all of the radar energy away from the receiver. Lockheed built a proof of concept demonstrator aircraft, the Lockheed Have Blue, nicknamed "the Hopeless Diamond", a reference to the famous Hope Diamond and the design's shape and predicted instability. Because advanced computers were available to control the flight of an aircraft that was designed for stealth but aerodynamically unstable such as the Have Blue, for the first time designers realized that it might be possible to make an aircraft that was virtually invisible to radar.

Reduced radar cross section is only one of five factors the designers addressed to create a truly stealthy design such as the F-22. The F-22 has also been designed to disguise its infrared emissions to make it harder to detect by infrared homing ("heat seeking") surface-to-air or air-to-air missiles. Designers also addressed making the aircraft less visible to the naked eye, controlling radio transmissions, and noise abatement.

The first combat use of purpose-designed stealth aircraft was in December 1989 during Operation Just Cause in Panama. On 20 December 1989, two United States Air Force F-117s bombed a Panamanian Defense Force barracks in Rio Hato, Panama. In 1991, F-117s were tasked with attacking the most heavily fortified targets in Iraq in the opening phase of Operation Desert Storm and were the only jets allowed to operate inside Baghdad's city limits.

General design

The general design of a stealth aircraft is always aimed at reducing radar and thermal detection. It is the designer's top priority to satisfy the following conditions, which ultimately decide the success of the aircraft:

Reducing thermal emission from thrust
Reducing radar detection by altering some general configuration (like introducing the split rudder)
Reducing radar detection when the aircraft opens its weapons bay
Reducing infra-red and radar detection during adverse weather conditions

Limitations

B-2 Spirit stealth bomber of the U.S. Air Force

Instability of design

Early stealth aircraft were designed with a focus on minimal radar cross section (RCS) rather than aerodynamic performance. Highly stealthy aircraft like the F-117 Nighthawk are aerodynamically unstable in all three axes and require constant flight corrections from a fly-by-wire (FBW) flight system to maintain controlled flight. As for the B-2 Spirit, which was based on the development of the flying wing aircraft by Jack Northrop in 1940, this design allowed for a stable aircraft with sufficient yaw control, even without vertical surfaces such as rudders.

Aerodynamic limitations

Earlier stealth aircraft (such as the F-117 and B-2) lack afterburners, because the hot exhaust would increase their infrared footprint, and flying faster than the speed of sound would produce an obvious sonic boom, as well as surface heating of the aircraft skin, which also increases the infrared footprint. As a result, their performance in air combat maneuvering required in a dogfight would never match that of a dedicated fighter aircraft. This was unimportant in the case of these two aircraft since both were designed to be bombers. More recent design techniques allow for stealthy designs such as the F-22 without compromising aerodynamic performance. Newer stealth aircraft, like the F-22, F-35 and the Su-57, have performance characteristics that meet or exceed those of current front-line jet fighters due to advances in other technologies such as flight control systems, engines, airframe construction and materials.

Electromagnetic emissions

The high level of computerization and large amount of electronic equipment found inside stealth aircraft are often claimed to make them vulnerable to passive detection. This is highly unlikely and certainly systems such as Tamara and Kolchuga, which are often described as counter-stealth radars, are not designed to detect stray electromagnetic fields of this type. Such systems are designed to detect intentional, higher power emissions such as radar and communication signals. Stealth aircraft are deliberately operated to avoid or reduce such emissions.

Current Radar Warning Receivers look for the regular pings of energy from mechanically swept radars while fifth generation jet fighters use Low Probability of Intercept Radars with no regular repeat pattern.

Vulnerable modes of flight

Stealth aircraft are still vulnerable to detection while and immediately after using their weaponry. Since stealth payload (reduced RCS bombs and cruise missiles) is not yet generally available, and ordnance mount points create a significant radar return, stealth aircraft carry all armaments internally. As soon as weapons bay doors are opened, the plane's RCS will be multiplied and even older generation radar systems will be able to locate the stealth aircraft. While the aircraft will reacquire its stealth as soon as the bay doors are closed, a fast response defensive weapons system has a short opportunity to engage the aircraft.

This vulnerability is addressed by operating in a manner that reduces the risk and consequences of temporary acquisition. The B-2's operational altitude imposes a flight time for defensive weapons that makes it virtually impossible to engage the aircraft during its weapons deployment. New stealth aircraft designs such as the F-22 and F-35 can open their bays, release munitions and return to stealthy flight in less than a second.

Some weapons require that the weapon's guidance system acquire the target while the weapon is still attached to the aircraft. This forces relatively extended operations with the bay doors open.

Such aircraft as the F-22 Raptor and F-35 Lightning II Joint Strike Fighter can also carry additional weapons and fuel on hardpoints below their wings. When operating in this mode the planes will not be nearly as stealthy, as the hardpoints and the weapons mounted on those hardpoints will show up on radar systems. This option therefore represents a trade off between stealth or range and payload. External stores allow those aircraft to attack more targets further away, but will not allow for stealth during that mission as compared to a shorter range mission flying on just internal fuel and using only the more limited space of the internal weapon bays for armaments.

Reduced payload

In a 1994 live fire exercise near Point Mugu, California, a U.S. Air Force B-2 Spirit dropped forty-seven 500 lb (230 kg) class Mark 82 bombs, which represents about half of a B-2's total ordnance payload in Block 30 configuration

Fully stealth aircraft carry all fuel and armament internally, which limits the payload. By way of comparison, the F-117 carries only two laser- or GPS-guided bombs, while a non-stealth attack aircraft can carry several times more. This requires the deployment of additional aircraft to engage targets that would normally require a single non-stealth attack aircraft. This apparent disadvantage however is offset by the reduction in fewer supporting aircraft that are required to provide air cover, air-defense suppression and electronic counter measures, making stealth aircraft "force multipliers".

Sensitive skin

Stealth aircraft often have skins made with radiation-absorbent materials or RAMs. Some of these contain carbon black particles, while some contain tiny iron spheres. There are many materials used in RAMs, and some are classified, particularly the materials that specific aircraft use.

Cost of operations

Stealth aircraft are typically more expensive to develop and manufacture. An example is the B-2 Spirit that is many times more expensive to manufacture and support than conventional bomber aircraft. The B-2 program cost the U.S. Air Force almost $45 billion.

Countermeasures

Reflected waves

Passive (multistatic) radar, bistatic radar and especially multistatic radar systems detect some stealth aircraft better than conventional monostatic radars, since first-generation stealth technology (such as the F117) reflects energy away from the transmitter's line of sight, effectively increasing the radar cross section (RCS) in other directions, which the passive radars monitor. Such a system typically uses either low frequency broadcast TV and FM radio signals (at which frequencies controlling the aircraft's signature is more difficult).

Researchers at the University of Illinois at Urbana–Champaign with support of DARPA, have shown that it is possible to build a synthetic aperture radar image of an aircraft target using passive multistatic radar, possibly detailed enough to enable automatic target recognition.

In December 2007, SAAB researchers revealed details for a system called Associative Aperture Synthesis Radar (AASR) that would employ a large array of inexpensive and redundant transmitters and receivers that could detect targets when they directly pass between the receivers/transmitters and create a shadow. The system was originally designed to detect stealthy cruise missiles and should be just as effective against low-flying stealth aircraft. That the array could contain a large amount of inexpensive equipment could potentially offer some "protection" against attacks by expensive anti-radar (or anti-radiation) missiles.

Infrared (heat)

Some analysts claim Infra-red search and track systems (IRSTs) can be deployed against stealth aircraft, because any aircraft surface heats up due to air friction and with a two channel IRST is a CO₂ (4.3 µm absorption maxima) detection possible, through difference comparing between the low and high channel. These analysts point to the resurgence in such systems in Russian designs in the 1980s, such as those fitted to the MiG-29 and Su-27. The latest version of the MiG-29, the MiG-35, is equipped with a new Optical Locator System that includes more advanced IRST capabilities. The French Rafale, the British/German/Italian/Spanish Eurofighter and the Swedish Gripen also make extensive use of IRST.

In air combat, the optronic suite allows:

Detection of non-afterburning targets at 45 kilometres (28 mi) range and more;
Identification of those targets at 8-to-10-kilometre (5.0 to 6.2 mi) range; and
Estimates of aerial target range at up to 15 kilometres (9.3 mi).

For ground targets, the suite allows:

A tank-effective detection range up to 15 kilometres (9.3 mi), and aircraft carrier detection at 60 to 80 kilometres (37 to 50 mi);
Identification of the tank type on the 8-to-10-kilometre (5.0 to 6.2 mi) range, and of an aircraft carrier at 40 to 60 kilometres (25 to 37 mi); and
Estimates of ground target range of up to 20 kilometres (12 mi).

Longer wavelength radar

VHF radar systems have wavelengths comparable to aircraft feature sizes and should exhibit scattering in the resonance region rather than the optical region, allowing most stealth aircraft to be detected. This has prompted Nizhny Novgorod Research Institute of Radio Engineering (NNIIRT) to develop VHF AESAs such as the NEBO SVU, which is capable of performing target acquisition for Surface-to-air missile batteries. Despite the advantages offered by VHF radar, their longer wavelengths result in poor resolution compared to comparably sized X band radar array. As a result, these systems must be very large before they can have the resolution for an engagement radar. An example of a ground-based VHF radar with counter-stealth capability is the P-18 radar.

The Dutch company Thales Nederland, formerly known as Holland Signaal, developed a naval phased-array radar called SMART-L, which is operated at L Band and has counter-stealth. All ships of the Royal Dutch Navy's De Zeven Provinciën class carry, among others, the SMART-L radar.

OTH radar (over-the-horizon radar)

Over-the-horizon radar is a concept increasing radar's effective range over conventional radar. The Australian JORN Jindalee Operational Radar Network can overcome certain stealth characteristics. It is claimed that the HF frequency used and the method of bouncing radar from ionosphere overcomes the stealth characteristics of the F-117A. In other words, stealth aircraft are optimized for defeating much higher-frequency radar from front-on rather than low-frequency radars from above.

Operational stealth aircraft

The F-22 Raptor, is an American fifth-generation stealth air superiority fighter

The U.S, UK, and Israel are the only countries to have used stealth aircraft in combat. These deployments include the United States invasion of Panama, the first Gulf War, the Kosovo Conflict, the War in Afghanistan, the War in Iraq and the 2011 military intervention in Libya. The first use of stealth aircraft was in the U.S. invasion of Panama, where F-117 Nighthawk stealth attack aircraft were used to drop bombs on enemy airfields and positions while evading enemy radar.

In 1990 the F-117 Nighthawk was used in the First Gulf War, where F-117s flew 1,300 sorties and scored direct hits on 1,600 high-value targets in Iraq while accumulating 6,905 flight hours. Only 2.5% of the American aircraft in Iraq were F-117s, yet they struck 40% of the strategic targets, dropping 2,000 tons of precision-guided munitions and striking their targets with an 80% success rate.

In the 1999 NATO bombing of Yugoslavia two stealth aircraft were used by the United States: the veteran F-117 Nighthawk, and the newly introduced B-2 Spirit strategic stealth bomber. The F-117 performed its usual role of striking precision high-value targets and performed well, although one F-117 was shot down by a Serbian Isayev S-125 'Neva-M' missile commanded by Colonel Zoltán Dani. The then-new B-2 Spirit was highly successful, destroying 33% of selected Serbian bombing targets in the first eight weeks of U.S. involvement in the War. During this war, B-2s flew non-stop to Kosovo from their home base in Missouri and back.

In the 2003 invasion of Iraq, F-117 Nighthawks and B-2 Spirits were used, and this was the last time the F-117 would see combat. F-117s dropped satellite-guided strike munitions on selected targets, with high success. B-2 Spirits conducted 49 sorties in the invasion, releasing 1.5 million pounds of munitions.

During the May 2011 operation to kill Osama bin Laden, one of the helicopters used to clandestinely insert U.S. troops into Pakistan crashed in the bin Laden compound. From the wreckage it was revealed this helicopter had stealth characteristics, making this the first publicly known operational use of a stealth helicopter.

Stealth aircraft were used in the 2011 military intervention in Libya, where B-2 Spirits dropped 40 bombs on a Libyan airfield with concentrated air defenses in support of the UN no-fly zone.

Stealth aircraft will continue to play a valuable role in air combat with the United States using the F-22 Raptor, B-2 Spirit, and the F-35 Lightning II to perform a variety of operations. The F-22 made its combat debut over Syria in September 2014 as part of the US-led coalition to defeat ISIS.

From February 2018, Su-57s performed the first international flight as they were spotted landing at the Russian Khmeimim Air Base in Syria. These Su-57s were deployed along with four Sukhoi Su-35 fighters, four Sukhoi Su-25s, and one Beriev A-50 AEW&C aircraft. It is believed that at least 4 Su-57 are deployed in Syria and that they have likely been armed with cruise missiles in combat.

In 2018, a report surfaced noting that Israeli F-35I stealth fighters conducted a number of missions in Syria and even infiltrated Iranian airspace without detection. In May 2018, Major General Amikam Norkin of IAF reported that Israeli Air Force F-35I stealth fighters carried out the first-ever F-35 strike in combat over Syria.

The People's Republic of China started flight testing its Chengdu J-20 stealth multirole fighter around in 2011 and made its first public appearance at Airshow China 2016. The aircraft entered service with the People's Liberation Army Air Force (PLAAF) in March 2017. Another fifth-generation stealth multirole fighter from China, the Shenyang FC-31 is also under flight testing.

Fifth-generation fighter

From Wikipedia, the free encyclopedia

https://en.wikipedia.org/wiki/Fifth-generation_fighter

Fifth-generation fighter

A Lockheed Martin F-35 Lightning II (top) and Lockheed Martin F-22 Raptor (bottom), two fifth-generation fighters used by the United States Air Force
Role	Fighter aircraft
National origin	United States China Russia
First flight	1990 (YF-22)
Introduction	2005 (F-22 Raptor)
Status	In service
Developed from	Fourth-generation fighter
Developed into	Sixth-generation fighter

A fifth-generation fighter is a jet fighter aircraft classification which includes major technologies developed during the first part of the 21st century. As of 2023, these are the most advanced fighters in operation. The characteristics of a fifth-generation fighter are not universally agreed upon, and not every fifth-generation type necessarily has them all; however, they typically include stealth, low-probability-of-intercept radar (LPIR), agile airframes with supercruise performance, advanced avionics features, and highly integrated computer systems capable of networking with other elements within the battlespace for situation awareness and C³ (command, control and communications) capabilities.

As of January 2023, the combat-ready fifth-generation fighters are the Lockheed Martin F-22 Raptor, which entered service with the United States Air Force (USAF) in December 2005; the Lockheed Martin F-35 Lightning II, which entered service with the United States Marine Corps (USMC) in July 2015; the Chengdu J-20, which entered service with the People's Liberation Army Air Force (PLAAF) in September 2017; and the Sukhoi Su-57, which entered service with the Russian Air Force (VVS) on 25 December 2020. Other national and international projects are in various stages of development.

Characteristics

The emerging generation of advanced fighter aircraft in the first decades of the 21st century have come to be known as the fifth generation. The defining characteristics of such a fifth-generation fighter are not universally agreed and not every fifth-generation type necessarily has them all. Some generation counts include more than five leading up to the emerging new generation.

Whereas previous fourth-generation fighters emphasized maneuverability and close-range dogfighting, typical fifth generation characteristics include:

Stealth, with munitions stored internally.
High maneuverability, which tends to include short-field capabilities.
Supercruise, i.e. prolonged supersonic cruise without the use of reheat.
Advanced avionics, including low-probability-of-intercept radar (LPIR).
Networked data fusion, enabling situation awareness on the battlefield.
Multirole capabilities, such as battlefield C³ (command, control and communications).

In order to minimize their radar cross-section (RCS), most fifth-generation fighters use chines instead of standard leading edge extensions and lack canards, though the Sukhoi T-50 has engine intake extensions that seem to function somewhat like canards, and the Chengdu J-20 designers have chosen the agility enhancements of canards in spite of their poor stealth characteristics. They all have twin canted vertical tails (similar to a V-tail) also to minimize side RCS. Most fifth-generation fighters with supermaneuverability achieve it through thrust vectoring.

They all have internal weapon bays in order to avoid high RCS weapon pylons, but they all have external hardpoints on their wings for use on non-stealthy missions, such as the external fuel tanks the F-22 carries when deploying to a new theater.

All fifth-generation fighters have a high percentage of composite materials, in order to reduce RCS and weight.

Software defined aircraft

All revealed fifth-generation fighters use commercial off-the-shelf main processors to directly control all sensors to form a consolidated view of the battlespace with both onboard and networked sensors, while previous-generation jet fighters used federated systems where each sensor or pod would present its own readings for the pilot to combine in their own mind a view of the battlespace.The F-22A was physically delivered without synthetic aperture radar (SAR) or situation awareness infra-red search and track. It will gain SAR later through software upgrades. However, any flaw in these complex software systems can disable supposedly unrelated aircraft systems, and the complexity of a software-defined aircraft can lead to a software crisis with additional costs and delays. By the end of 2013, the biggest concern with the F-35 program was software, especially the software required for data fusion across the many sensors.

Sukhoi calls their expert system for sensor fusion the artificial intelligence of the Su-57. Flight tests of their integrated modular avionics started in 2017 on a fiber optic networked multicore processor system. The system is not without faults. In December 2020, a malfunction with the computer flight control system caused the first production Su-57 to crash.

An automatic software response to an overheat condition apparently has contributed to a crash of an F-22. Issues with the avionics also contributed to an F-35A crash in 2020.

The F-35 uses software-defined radio systems, in which common middleware controls field-programmable gate arrays. Col. Arthur Tomassetti has said that the F-35 is a "software intensive airplane and software is easy to upgrade, as opposed to hardware."

In order to ease the addition of new software features, the F-35 has adopted a kernel and application separation of security responsibilities.

Steve O'Bryan of Lockheed Martin has said that the F-35 may gain the ability to operate UAVs through a future software upgrade. The USN is already planning to place its Unmanned Carrier-Launched Airborne Surveillance and Strike system under the control of a manned aircraft, to act as a flying missile magazine.

Situational awareness

The combination of stealthy airframes, stealthy sensors, and stealthy communications is designed to allow fifth-generation fighters to engage other aircraft before those targets are aware of their presence. Lt. Col. Gene McFalls of the USAF has said that sensor fusion will feed into inventory databases to precisely identify aircraft at a distance.

Sensor fusion and automatic target tracking are projected to give the fifth-generation jet fighter pilot a view of the battlespace superior to that of legacy AWACS (Airborne Warning and Control System) aircraft that may be forced back from the front lines by increasing threats. Therefore, tactical control could be shifted forwards to the pilots in the fighters. Michael Wynne, former Secretary of the United States Air Force, has suggested elimination of the Boeing E-3 Sentry and Northrop Grumman E-8 Joint STARS in favor of more F-35s, simply because so much effort is being made by the Russians and Chinese to target these platforms that are built to commercial airliner standards.

However, the more powerful sensors, such as AESA radar which is able to operate in multiple modes at the same time, may present too much information for the single pilot in the F-22, F-35 and Su-57 to adequately use. The Sukhoi/HAL FGFA offered a return to the two-seat configuration common in fourth generation strike fighters, but this was rejected over cost concerns.

There is ongoing research to apply track-before-detect across sensor fusion in the core CPU to allow fifth-generation fighters to engage targets that no single sensor has by itself detected. Probability theory is used to determine "what data to believe, when to believe and how much to believe".

These sensors produce too much data for the onboard computers to fully process so sensor fusion is achieved by comparing what is observed against preloaded threat libraries that contain known enemy capabilities for a given region. Items that do not match known threats are not even displayed.

Combat cloud

Gilmary M. Hostage III has suggested that fifth-generation jet fighters will operate together in a "combat cloud" along with future unmanned combat aircraft, and Michael Manazir has suggested that this might come as quickly as loading a UCLASS with AMRAAMs to be launched at the command of an F-35.

History

Introduction timeline
2006
2005	F-22A Raptor
2007
2008
2009
2010
2011
2012
2013
2014
2015	F-35B Lightning II
2016	F-35A Lightning II
2017	Chengdu J-20A
2017	F-35I Lightning II
2018
2019	F-35C Lightning II
2020	Chengdu J-20B
2020	Sukhoi Su-57
2021
2022
TBA	Chengdu J-20S
	Shenyang FC-31
	HAL AMCA
	TAI TF-X Kaan
	Flygsystem 2020
	Sukhoi Su-75 Checkmate

United States

Technology Demonstrators included the YF-22 – 1990 (2 built), YF-23 – 1990 (2 built), Boeing Bird of Prey – 1996 (1 built), X-36 – 1997 (2 scale models built), X-35 – 2000 (2 built), X-32 – 2001 (1 built).

Lockheed Martin F-22 Raptor

Previous-generation radar low observable (LO) aircraft, also referred to as stealth aircraft, such as the B-2 Spirit and F-117 Nighthawk were designed to be bombers or ground attack aircraft, lacking the active electronically scanned array (AESA) radars, low probability of intercept (LPI) data networks, aerial performance, and air-to-air weapons necessary to engage other aircraft. In the early 1970s, various American design projects identified stealth, speed, and maneuverability as key characteristics of a next-generation air-to-air combat aircraft. This led to the Request for Information for the Advanced Tactical Fighter project in May 1981, which resulted in the F-22.

Lockheed Martin F-35A Lightning II

The USMC is leveraging the USAF's experience with "fifth-generation air warfare" in the F-22, as they develop their own tactics for the F-35.

According to Lockheed Martin in 2004, the only fifth-generation jet fighter then in operational service was their own F-22 Raptor. Lockheed Martin uses "fifth-generation fighter" to describe the F-22 and F-35 fighters, with the definition including "advanced stealth", "extreme performance", "information fusion" and "advanced sustainment". For unknown reasons, their definition no longer includes supercruise capability, which has typically been associated with the more advanced modern fighters, but which the F-35 lacks. Lockheed Martin attempted to trademark the term "5th generation fighters" in association with jet aircraft and structural parts thereof, and has a trademark for a logo with the term.

The definition of the term fifth-generation fighter from Lockheed Martin has been criticized by companies whose products do not conform to these particular specifications, such as Boeing and Eurofighter, and by other commentators such as Bill Sweetman: "it is misleading to portray the F-22 and F-35 as a linear evolution in fighter design. Rather, they are a closely related pair of outliers, relying on a higher level of stealth as a key element of survivability – as the Lockheed YF-12 and Mikoyan MiG-25, in the 1960s, relied on speed and altitude."

The United States Navy and Boeing have placed the Boeing F/A-18E/F Super Hornet in a "next generation" fighter category along with the F-22 and F-35, as the Super Hornet has a "fifth-generation" AESA radar, modest radar cross-section (RCS) reductions and sensor fusion. A senior USAF pilot has complained about fifth-generation claims for the Super Hornet: "The whole point to fifth generation is the synergy of stealth, fusion and complete situational awareness. The point about fifth-generation aircraft is that they can do their mission anywhere – even in sophisticated integrated air defense [IADS] environments. If you fly into heavy IADS with a great radar and sensor fusion, but no stealth, you will have complete situational awareness of the guy that kills you." Michael "Ponch" Garcia of Raytheon has said that the addition of their AESA radars to the Super Hornet provides "90 percent of your fifth-generation capability at half the cost." And a top Boeing official has called their newest 4.5 generation fighters "stealth killers".

China

Chengdu J-20, introduced in 2017

Shenyang FC-31 prototype

By the late 1990s, several Chinese fifth-generation fighter programs, grouped under the program codename J-XX or XXJ, were identified by western intelligence sources. PLAAF officials have confirmed the existence of such a program, which they estimated would enter service between 2017 and 2019. By late 2010, two prototypes of the Chengdu J-20 had been constructed and were undergoing high-speed taxi trials. The J-20 made its first flight on 11 January 2011. On 26 December 2015, a new J-20 with serial number 2101 was seen leaving its Chengdu Aviation Corporation factory. It is believed to be the first of the low rate initial production (LRIP) aircraft. 2101 conducted its maiden flight on 18 January 2016.

The J-20 officially entered service in September 2017 and the PLAAF began inducting J-20s into combat units in February 2018.

Another stealth fighter design from SAC started to circulate on the internet in September 2011. In June 2012, photos about a possible prototype of F-60 being transferred on highway began to emerge on the internet. This aircraft was named Shenyang FC-31 later, and made its maiden flight on 31 October 2012.

Russia

Sukhoi Su-57 of the Russian Air Force

A static prototype of the Sukhoi Su-75 Checkmate at the MAKS Airshow 2021

Technology demonstrators included the Mikoyan Project 1.44 – 1998 (1 built) and Su-47 – 1997 (1 built).

In the late 1980s, the Soviet Union outlined the need for a next-generation aircraft to replace its fourth-generation jet fighters, the Mikoyan MiG-29 and Sukhoi Su-27, in front line service. To meet the characteristics for the next-generation aircraft, work was underway on two aircraft projects: the twin-engined delta canard Sukhoi Su-47 with forward-swept wings and the Mikoyan Project 1.44. However, due to the dissolution of the Soviet Union and lack of funds, both remained only as technology demonstrators.

After 2000, the Russian Defence Ministry initiated a new fighter competition known as "PAK FA" (Russian: ПАК ФА, short for: Перспективный авиационный комплекс фронтовой авиации, romanized: Perspektivny Aviatsionny Kompleks Frontovoy Aviatsii, lit. ''Prospective aeronautical complex of front-line air forces'') to develop a next-generation fighter for the Russian Air Force, with Sukhoi and MiG as the main competitors. Sukhoi came up with its heavier, two-engine T-50 proposal (now Sukhoi Su-57) while Mikoyan proposed a light, single-engine Mikoyan LMFS design, based on the former MiG-1.44 project. Sukhoi won the competition and in 2002, it was selected to lead the development of Russia's next-generation fighter based on the T-50 design. Later development of the multirole Mikoyan LMFS were continued from MiG funding. However Mikoyan LMFS program was also cancelled and replaced by similar Sukhoi Checkmate program.

Russia's first fifth-generation aircraft, the Sukhoi Su-57, will replace its aging MiG-29s and Su-27s. The Su-57 first flew on 29 January 2010. The first production Su-57 was delivered to the Russian Air Force on 25 December 2020.

The Mikoyan PAK DP is another proposed fifth-generation fighter, being developed to replace the MiG-31. The project began in 2010, and "According to Russian news reports, the MiG-41 will be equipped with stealth technology, reach a speed of Mach 4–4.3, carry anti-satellite missiles, and be able to perform tasks in Arctic and near-space environments."

Russia unveiled a prototype of the single-engine Sukhoi Su-75 Checkmate Light Tactical Aircraft in July 2021 at the biennial MAKS (air show), with maiden flight initially expected in 2023 (subsequently delayed to at least 2024). The fighter is mainly designed for export and is expected to be less costly than 2-engine competitors.

India

India is independently developing a twin-engine fifth-generation supermaneuverable stealth multirole fighter, called the HAL Advanced Medium Combat Aircraft (AMCA). It is being developed and designed by the Aeronautical Development Agency and will be manufactured by a SPV with initial prototypes produced by Hindustan Aeronautics Limited. As of 2022, the AMCA prototype is under construction, with a first flight of the prototype expected by 2025.

In early 2018, India pulled out of the parallel project called FGFA, a fifth-generation derivative of the Sukhoi Su-57, which it alleged did not meet requirements for stealth, combat avionics, radars and sensors by that time. The completed FGFA was to include 43 improvements over the Su-57, including stealth, supercruise, advanced sensors, networking and combat avionics.

However many analysts have questioned the feasibility of India's ability to independently develop a fifth generation fighter aircraft as India lacks the industrial base and technical capabilities to do so, particularly a lack of research and design expertise. India also lacks a robust military industrial base to manufacture the aircraft in large numbers.

Turkey

Mock-up of the TAI TFX at the 2019 Teknofest

TAI TF-X is a Turkish fifth-generation fighter program. In 2011 Türk Havacılık ve Uzay Sanayii AŞ (Turkish Aerospace Industries or TAI) initiated a $20 million concept design phase for a fifth-generation fighter, TAI TF-X. During a State visit of the President of Turkey to Sweden on 13 March 2013, TAI signed an agreement with Sweden's Saab AB to provide design support services to Turkey for the TAI TFX program. TAI has stated that the program will cost $120 billion (with engine development).

TAI CEO Temel Kotil stated that the TF-X will be unveiled by March 23, 2023 and make its first flight by 2025. The fighter jet is expected to enter service in 2029.

Sweden

Saab's Flygsystem 2020 is a program to develop a fifth generation fighter.

Japan

Mitsubishi X-2 Shinshin

Japan developed a prototype of a stealth jet fighter called the Mitsubishi X-2 Shinshin, previously referred to as the ATD-X. At the beginning of the twenty-first century, Japan, seeking to replace its aging fleet of fighter aircraft, began making overtures to the United States on the topic of purchasing F-22 fighters for their own forces. However the U.S. Congress had banned the exporting of the aircraft in order to safeguard secrets of the aircraft's technology such as its extensive use of stealth; this rejection necessitated Japan's development of its own modern fighter, to be equipped with stealth features and other advanced systems.

A mock-up of the X-2 Shinshin was constructed and used to study the radar cross section in France in 2009. The first prototype rolled out in July 2014 and the aircraft made its first flight on 22 April 2016. By July 2018, Japan had gleaned sufficient information, and decided that it would need to bring on international partners to complete this project. Several companies have responded.

Japan has signed a contract with Mitsubishi Heavy Industries to develop a sixth-generation fighter called Mitsubishi F-X.

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Thursday, May 18, 2023

Human rights in Bangladesh

Overview

Citizenship and minority rights

Non-Bengalis

Refugees

Persecution of non-Muslims

Persecution of minority Muslims

Labour rights

Forced labours

Freedom of speech

Democracy

Elections

Free votes

Emergency powers

Law and justice

Extrajudicial killings

Capital punishment

Women rights

LGBT rights

Corruption

Stealth aircraft

Background

World War I and World War II

Modern era

General design

Limitations

Instability of design

Aerodynamic limitations

Electromagnetic emissions

Vulnerable modes of flight

Reduced payload

Sensitive skin

Cost of operations

Countermeasures

Reflected waves

Infrared (heat)

Longer wavelength radar

OTH radar (over-the-horizon radar)

Operational stealth aircraft

Fifth-generation fighter

Characteristics

Software defined aircraft

Situational awareness

Combat cloud

History

United States

China

Russia

India

Turkey

Sweden

Japan

Representation of a Lie group