Anti stealth radar.

Equation

Lieutenant General
Being able to detect a stealth target at 100km is not very impressive. There are many mere glide bombs that could outrange this radar. You need something that can least outrange those.

Ahh..but the program just started, wait till further development. China has the money, the scientists, and engineers to continue this Quantum radar programs research and development. And like I have said many times in anything...IT'S ALL ABOUT THE PROGRAM.:D
 

shen

Senior Member
A much better article re-posted from CDF. This is obviously very early in the research stage, but the potential is exciting.

The end of stealth? New Chinese radar capable of detecting ‘invisible’ targets 100km away
Breakthrough relies on ‘spooky’ phenomenon of quantum entanglement

By Stephen Chen

A top Chinese military technology company shocked physicists around the world this week when it announced it had developed a new form of radar able to detect stealth planes 100km away.

The breakthrough relies on a ghostly phenomenon known as quantum entanglement, which Albert Einstein dubbed “spooky action at a distance”.

China Electronics Technology Group Corporation (CETC), one of the “Top 10” military industry groups controlled directly by the central government, said on Sunday that the new radar system’s entangled photons had detected targets 100km away in a recent field test.

That’s five times the “potential range” of a laboratory prototype jointly developed by researchers from Canada, Germany, Britain and the United States last year.
America’s Defence Advanced Research Projects Agency has reportedly funded similar research and military suppliers such as Lockheed Martin are also developing quantum radar systems for combat purposes, according to media reports, but the progress of those military projects remains unknown.

In a statement posted on its website on Sunday, CETC said China’s first “single-photon quantum radar system” had “important military application values” because it used entangled photons to identify objects “invisible” to conventional radar systems.

Nanjing University physicist Professor Ma Xiaosong, who has studied quantum radar, said he had “not seen anything like this in an open report”.

“The effective range reported by the international research community falls far below 100km,” he said.

A military radar researcher at a university in northwestern China said the actual range of the new radar could be even greater than that announced by CETC.

“The figure in declassified documents is usually a tuned-down version of the real [performance],” he said. “The announcement has gone viral [in the radar research community].”

The scientists said they were shocked because, until recently, the idea of quantum radar had remained largely confined to science fiction.

Quantum physics says that if you create a pair of entangled photons by splitting the original photon with a crystal, a change to one entangled photon will immediately affect its twin, regardless of the distance between them.

A quantum radar, generating a large number of entangled photon pairs and shooting one twin into the air, would be capable of receiving critical information about a target, including its shape, location, speed, temperature and even the chemical composition of its paint, from returning photons.

That sounds similar to a normal radar, which uses radio waves, but quantum radar would be much better at detecting stealth planes, which use special coating materials and body designs to reduce the radio waves they deflect, making them indistinguishable from the background environment.

In theory, a quantum radar could detect a target’s composition, heading and speed even if managed to retrieve just one returning photon. It would be able to fish out the returning photon from the background noise because the link the photon shared with its twin would facilitate identification.

The CETC breakthrough benefited largely from the recent rapid development of single-photon detectors, which allowed researchers to capture returning photons with a high degree of efficiency.

CETC said the quantum radar’s advantage was not limited to the detection of stealth planes.

The field test had opened a “completely new area of research”, it said, with potential for the development of highly mobile and sensitive radar systems able to survive the most challenging combat engagements.

Quantum radar systems could be small and would be able to evade enemy countermeasures such anti-radar missiles because the ghostly quantum entanglement could not be traced, it said.

The company said it had worked with quantum scientists at the University of Science and Technology of China in Hefei, Anhui province, where many quantum technology breakthroughs have been achieved, including the world’s longest quantum key distribution network for secured communication and the development of the world’s first quantum satellite.

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taxiya

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here are two articles describing the same (one of) scheme. LM is supposedly working on this concept. I suppose the CETC one works the same way.

Essentially, it beams out conventional microwave like other radar. What quantum entanglement does is to filter out the strong background noises, therefor, extend/recover the detection range that is lost by the conventional radar due to weakened return signal strength by a LO object. It is basically the same principle as CDMA which use the chip coding to separate signals from broadband noise.

This scheme will defeat the RAM coating aspect of LO which is reducing the returning signal strength, lowering the S/N rate. But will have almost no effect against shaping as LO shaping will reflect the incoming signals to other directions that they never come back to the radar.

All these technologies employed in this kind of device are already there, some of them are out in the field, like the quantum satellite that China just sent to the space.

I have a feeling that there could be another scheme that does not rely on returned signals, but only rely on the LO object to destroy the entanglement of the illumination wave, the collapse of entanglement is then detected by the measurement of the other pair which is not sent out from the radar. This will boost if not double the detection range. And it will also defeat the LO shaping as it does not need the return signal so long as it is strong enough to reach the target. I don't know if it is possible, but it is a direction worth to be investigated.
 

Hendrik_2000

Lieutenant General
China keep working on defeating stealth there are plethora of anti stealth radar in the work Here is one of them
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China powers up new radar tech to unmask stealth fighters

Chinese arms firm tests T-ray system designed to penetrate anti-detection coatings on aircraft

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China’s biggest arms manufacturer has tested a new instrument to detect stealth aircraft, technology that could be a military “game changer” if mounted on a satellite or plane, scientists say.

China North Industries Group Corporation tested a device capable of generating terahertz radiation with unprecedented power at a military research facility in Chengdu, Sichuan province, last week, Science and Technology Daily reported on Monday.

Terahertz radiation, or T-rays, can penetrate composite materials to reach underlying metallic layers and is widely used in industrial plants to spot product defects.

Terahertz radars are already capable of finding a concealed weapon in a crowd from hundreds of metres away, and a more powerful version is under development to put on an early warning aircraft or satellite to identify and track military aircraft, including the US’ F-22 and F-35 stealth fighters.

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Attempts to realise military applications for T-ray technology have been limited by the bulk and low power output of terahertz generators. The rays fall on the spectrum between microwaves and light and cannot be produced by conventional radio or optical devices.

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The report said the new device could generate stable, continuous radiation at an average level up to 18 watts, and terahertz pulses with peak power close to one megawatt, on par with some military radars.

A technical executive at a vendor in China for T-ray devices used in F-35 manufacturing said the reported power levels of the device were “more than a million times higher than the power of the T-ray device used to measure the thickness of coatings on the F-35”.

“The radar-absorbent coatings on the F-35 will look as thin and transparent as stockings if [the Chinese instrument] is as powerful as they claim,” the executive said.

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“It looks like they will soon be able to have an echo image of the F-35 with some high-definition details ... from a respectable distance.”

China has claimed that some of its existing very-high-frequency military radar can detect traces of stealth aircraft but doubters say the microwaves from those devices would be absorbed or deflected by stealth materials.

Qi Jiaran, deputy director of the department of microwave engineering at the Harbin Institute of Technology, said the new instrument could be a game changer.

Qi, a terahertz imaging specialist not directly involved in the Chengdu project, said the report suggested that China had made a breakthrough in some key technology and components.

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But the technology was still bulky and could not be fitted easily on a plane or satellite.

“Field deployment may require power output at the kilowatt level. There is still a long way to go before we can monitor stealth fighters or bombers from space,” Qi said.

The new instrument was developed by the China Academy of Engineering Physics in Mianyang, the nation’s largest research institute for the development and production of nuclear weapons.

According to the academy’s website, efforts were under way to increase the device’s power output and shrink its size for military applications.


This article appeared in the South China Morning Post print edition as: New device could detect US stealth warplanes
 

ougoah

Brigadier
Registered Member
Wonder why they are revealing these efforts at such an early stage? Could they have already been developed and currently field tested? or an attempt at disguising actual strategies and equipment by means of diversion. China usually does not show anything that isn't already quite concrete and show for some important reasons like deterrence from aggression.
 

10thman

Junior Member
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Chinese developed anti-stealth radar is superior to its foreign counterparts: top radar scientist
Unmatched performance
By
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and
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in Nanjing
Published: Apr 24, 2021 12:34 PM

More than 30,000 visitors from home and abroad visited the 9th World Radio Detection & Ranging Expo. Photo: Cui Meng/GT

More than 30,000 visitors from home and abroad visited the 9th World Radar Detection & Ranging Expo. Photo: Cui Meng/GT
The development of China's radar equipment is on par with the most advanced level in the world, and the development of artificial intelligence (AI) technologies could bring important changes to the radar industry in the future, as their applications could significantly enhance operational efficiency of radar systems, a top Chinese scientist in the radar industry said.

Hu Mingchun, director of the No.14 Research Institute at the state-owned China Electronics Technology Group Co, made the statements in an exclusive interview with the Global Times on the sidelines of the 9th World Radar Expo held in Nanjing, capital of East China's Jiangsu Province on Friday. He introduced star items the research institute brought to the exhibition, including
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like the SLC-7 L-band 3D surveillance radar system and YLC-8E UHF-band 3D surveillance radar system as well as
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like YLC-48 portable multipurpose reconnaissance radar.

The antenna of the YLC-8E is gigantic. With its high power and cutting-edge information process technology, it can detect even the most advanced stealth aircraft. It can also detect other types of targets at long range and high definition with its key parameters superior, making it superior to foreign competitors.

The SLC-7, on the other hand, can take on even more types of targets making it much more versatile than many other competing products.

Previous radar systems often had dedicated functions, but this versatile radar can not only detect stealth targets but also be used in fields like early warning and artillery reconnaissance. This means that this radar alone can serve the purpose of multiple radars operating at the same time, Hu said.

Hu Mingchun, director of the No.14 Research Institute under China Electronics Technology Group Co.  Photo: Cui Meng/GT

Hu Mingchun, director of the No.14 Research Institute under China Electronics Technology Group Co. Photo: Cui Meng/GT
World-class development

Dubbed the terminator of drones, the YLC-48 portable multifunctional reconnaissance radar has outstanding ability to detect low-altitude, small and slow targets. It adopts the domestic pioneering circular digital phased array system and, thanks to the wide use of digital integrated circuits, the radar is small, light and mobile, making it suitable for all kinds of lightweight weapons platforms, for all-weather operations with rapid deployment and withdrawal.

Low-altitude, small and slow targets like drones pose many threats to air defense, as they have become some of the major killing weapons in real combat, Hu said, noting that as drones have also become easily accessible to normal people, incidents involving unauthorized flying of drones are also becoming frequent.

"That is why we are bringing radar systems specially designed to deal with low-altitude, small and slow targets," Hu said.

China's radars are on par with their most advanced counterparts in the world, and this is because China's latest achievements in the electronics and information industry were all reflected in the country's radar equipment, Hu said.

Large military conglomerates including China Electronics Technology Group Co and China Electronics Information Industry Group Co are showcasing their radar technologies at the Expo.  Photo: Cui Meng/GT

Large military conglomerates including China Electronics Technology Group Co and China Electronics Information Industry Group Co are showcasing their radar technologies at the Expo. Photo: Cui Meng/GT
"In some fields, China has already been in the leading place, because we are now on the path of independent research and development, and we do not have anything to make reference to," Hu told the Global Times.

The fire control radar equipped on the China-Pakistan jointly developed JF-17 fighter jet is already at the most advanced level in the world, while the likes of China's anti-stealth radar installations, the "Chinese Aegis" ship-borne radar systems and the airborne radar on the KJ-2000 early warning aircraft can all rival their cutting-edge foreign counterparts, according to Hu.

This year marks the 100th anniversary of the founding of the Communist Party of China (CPC).

Hu said that the history of radar development in China is a miniature of the history of struggle under the leadership of the CPC.

According to Hu, the radar industry has played an important role in every stage of China's development. After the founding of the People's Republic of China, the No.14 Research Institute provided all the radar equipment for the War to Resist US Aggression and Aid Korea (1950-53), which laid a foundation for the eventual victory. When the US warplanes took off, China's radar could detect them in time and arrange anti-aircraft artillery and fighter jets to intercept them.

"Not long ago, when the country issued commemorative medals for those who fought in the war, many in our institute got the medals," Hu told the Global Times.

The No.14 Research Institute is also constantly introducing new technologies and products in response to the country's needs. During the military parade marking the 70th anniversary of the founding of the People's Republic of China, the early warning aircraft of the air force echelon through Tiananmen Square, the KJ-2000, carried the institute's early warning radar, and many more fighter jets were also equipped with the institute's radars.

The 9th World Radar Detection & Ranging Expo kicks off in Nanjing on April 22. Photo: Cui Meng/GT

The 9th World Radar Detection & Ranging Expo kicks off in Nanjing on April 22. Photo: Cui Meng/GT
AI the future trend

When it comes to the development direction of China's radar equipment in the future, Hu said it is a trend from the development of single radars to the development of radar systems. In addition, the development of electronic information technology and hardware technology will help develop radars to deliver higher performance and have stronger capabilities with smaller sizes.

With the continuous improvement of computer processing and calculation, the radar based on software technology is also expected to see a big development, Hu said.

A foreign visitor is taking photo of a radar system displayed at the Expo.  Photo: Cui Meng/GT

A foreign visitor is taking photo of a radar system displayed at the Expo. Photo: Cui Meng/GT
The application and rapid development of AI will also play a very important role in the subsequent application of radar. Hu said the application of AI could turn traditional radars into intelligent ones, so that they can make new adjustments according to the environment; to learn, to accumulate experience and constantly improve their ability. AI can assist the operator's judgment and decision making, improve operation accuracy, and greatly reduce the operator's pressure.

With AI, in the future the operator could take what's in his or her mind and transmit it directly to the machine through sensors instead of operating keyboards and other devices, Hu said. "In the past, you need to use your eyes and hands. Now, you need only your eyes in order to let the radar do what you want. Under complex or emergency situations, this can greatly enhance the operational efficiency and solve many problems that we could not in the past."

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