What's new

Chinese Radars

upload_2019-6-10_17-39-25.png

CCTV has previously reported that a high-frequency surface wave radar test centre has built in Weihai, on east coast in Shandong province.
The maritime radar system, developed by a team led by Chinese academician Liu Yongtan, can detect naval and aerial hostiles hundreds of kilometers away under any weather condition.
New radar system immune to 'radar killer' missiles (anti-radiation missiles).
Anti-radiation missiles would need huge antennas to track high-frequency surface waves because their beams are too wide for the antennas currently in use to track.
Shi Lao, a Shanghai-based military commentator, said he believed that as Liu’s technology developed it could be used as a low-cost coastal monitoring system that could protect the coastline within a range of 400km (250 miles).

40ce6e7a-1323-11e9-bd68-61a0d0b9ce58_image_hires_103208.JPG

Liu Yongtan, told Naval and Merchant Ships that the new high-frequency surface wave radar (HFSWR) was also masked from anti-radiation missiles.
He also said the long wavelength could help detect stealth aircraft, which use special protective materials and designs to make them “invisible” to microwave radars, but have no such protection against high-frequency surface waves.



Main contents of this program: On the morning of January 8, 2019, the National Science and Technology Awards Conference was held in the Great Hall of the People. Radar expert Liu Yongtan and protective engineering expert Qian Qihu won the highest award in China's scientific and technological circles - the highest scientific and technological award in the country. . Due to the confidential nature of the work, the names of the two scientists have not been widely known for many years, but the areas they study are major projects related to national security and people's peace. "Everyone" is one of the largest CCTV capacity talk shows. The main target of the interview is "everyone" who has made outstanding contributions in the fields of science, education and culture in China. "Everyone" is not only a window for the masters to tell their life experiences, but also to show their spiritual demeanor.

The 2nd half of the video is devoted to Qian Qihu a nuclear blast expert who design the Great Chinese underground great wall that can withstand nuclear attack. It is not part of radar But since the video talks about these 2 gentlemens.

The 2nd half of the video is devoted to Qian Qihu a nuclear blast expert who design the Great Chinese underground great wall that can withstand nuclear attack.

China’s ‘Underground Steel Great Wall’ capable of defeating hypersonic weapon attacks: academician
By Deng Xiaoci and Liu Xuanzun Source:Global Times Published: 2019/1/13 17:33:39
http://www.globaltimes.cn/content/1135576.shtml
China should stay alert to US low-yield nuclear warheads

6ad4e9e7-7644-47ba-8ced-d4780dc38128.jpeg

Qian Qihu, recipient of the 2018 State Preeminent Science and Technology Award, during his interview with the Global Times on Friday. Photo: Deng Xiaoci/GT

China's "Underground Steel Great Wall" could "guarantee the security of the country's strategic arsenal" against potential attacks, including those from future hypersonic weapons, Qian Qihu, recipient of the country's highest science and technology award, told the Global Times.

Qian, 82, an academician of both the Chinese Academy of Sciences and the Chinese Academy of Engineering, received the 2018 State Preeminent Science and Technology Award during a conference at the Great Hall of the People in Beijing on Tuesday.

The "Underground Steel Great Wall" is a series of defense facilities located deep under mountains. While the mountain rock is thick enough to resist enemy attacks, entrances and exits of these facilities are often vulnerable and Qian's work was to provide extra protection for these parts.

China's nuclear strategy follows the principle of "no first use" and requires the country to have the capability of withstanding a nuclear attack before it responds with its strategic weapons.

Qian's work guaranteed the safety of the country's strategic weapons, launch and storage facilities as well as commanders' safety during extreme times, said Song Zhongping, a military expert and TV commentator.

In an exclusive interview with the Global Times on Friday, Qian describes his work, the "Underground Steel Great Wall," as the "country's last national defense line."

If other lines of defense including the strategic missile interception system, anti-missile system and air defense system fail to function against hypersonic missiles and recently developed bunker-busters, Qian's work can still thwart such attacks.

"The development of the shield must closely follow the development of spears. Our defense engineering has evolved in a timely manner as attack weapons pose new challenges," Qian said.

According to the academician, hypersonic weapons that move 10 times as fast as the speed of sound are capable of changing trajectory mid-flight and penetrate any anti-missile installations.

US media outlet CNBC reported that in March 2018 during a State of the Nation address, Russian President Vladimir Putin debuted new nuclear and hypersonic weapons, which he described as "invincible."

The US is also trying to develop hypersonic weapons, as then US Deputy Secretary of Defense Patrick Shanahan, now acting secretary of defense, said in October. "We are going to fly sooner and more often than people have ever expected," CNBC reported.

Emerging challenges
National defense challenges do not only emerge from the development of advanced attack weapons but are also a result of an unpredictable international environment, Qian said.
He cited the recent US stance whereby the Donald Trump administration is mulling lowering the threshold for nuclear weapons deployment.

The US is planning to loosen US nuclear weapons constraints and developing low-yield nuclear warheads, the Wall Street Journal reported in January 2018.

It is highly possible that US weapons with low-yield nuclear warheads are bunker-busters, with a higher surgical strike capability that may cause larger damage, military experts previously noted, warning that China should stay alert and upgrade its own national defense.

Qian has also provided advice on civilian construction projects, including the Nanjing Yangtze River Tunnel, the Hong Kong-Zhuhai-Macao Bridge and the giant South-to-North Water Transfer Project, according to a China Global Television Network report.

Asked how he would spend the 8 million yuan cash award, Qian said that part would go to research on national defense, and the rest used for social welfare projects such as fighting poverty and supporting poor students.

"I have never had a thought of earning any prize money for my research, nor would I think it came too late," Qian said. "I am only grateful that national recognition offers a great opportunity to raise the public's national defense awareness."
 
Last edited:
.
View attachment 564733
CCTV has previously reported that a high-frequency surface wave radar test centre has built in Weihai, on east coast in Shandong province.
The maritime radar system, developed by a team led by Chinese academician Liu Yongtan, can detect naval and aerial hostiles hundreds of kilometers away under any weather condition.
New radar system immune to 'radar killer' missiles (anti-radiation missiles).
Anti-radiation missiles would need huge antennas to track high-frequency surface waves because their beams are too wide for the antennas currently in use to track.
Shi Lao, a Shanghai-based military commentator, said he believed that as Liu’s technology developed it could be used as a low-cost coastal monitoring system that could protect the coastline within a range of 400km (250 miles).

40ce6e7a-1323-11e9-bd68-61a0d0b9ce58_image_hires_103208.JPG

Liu Yongtan, told Naval and Merchant Ships that the new high-frequency surface wave radar (HFSWR) was also masked from anti-radiation missiles.
He also said the long wavelength could help detect stealth aircraft, which use special protective materials and designs to make them “invisible” to microwave radars, but have no such protection against high-frequency surface waves.



Main contents of this program: On the morning of January 8, 2019, the National Science and Technology Awards Conference was held in the Great Hall of the People. Radar expert Liu Yongtan and protective engineering expert Qian Qihu won the highest award in China's scientific and technological circles - the highest scientific and technological award in the country. . Due to the confidential nature of the work, the names of the two scientists have not been widely known for many years, but the areas they study are major projects related to national security and people's peace. "Everyone" is one of the largest CCTV capacity talk shows. The main target of the interview is "everyone" who has made outstanding contributions in the fields of science, education and culture in China. "Everyone" is not only a window for the masters to tell their life experiences, but also to show their spiritual demeanor.

The 2nd half of the video is devoted to Qian Qihu a nuclear blast expert who design the Great Chinese underground great wall that can withstand nuclear attack. It is not part of radar But since the video talks about these 2 gentlemens.

The 2nd half of the video is devoted to Qian Qihu a nuclear blast expert who design the Great Chinese underground great wall that can withstand nuclear attack.

China’s ‘Underground Steel Great Wall’ capable of defeating hypersonic weapon attacks: academician
By Deng Xiaoci and Liu Xuanzun Source:Global Times Published: 2019/1/13 17:33:39
http://www.globaltimes.cn/content/1135576.shtml
China should stay alert to US low-yield nuclear warheads

6ad4e9e7-7644-47ba-8ced-d4780dc38128.jpeg

Qian Qihu, recipient of the 2018 State Preeminent Science and Technology Award, during his interview with the Global Times on Friday. Photo: Deng Xiaoci/GT

China's "Underground Steel Great Wall" could "guarantee the security of the country's strategic arsenal" against potential attacks, including those from future hypersonic weapons, Qian Qihu, recipient of the country's highest science and technology award, told the Global Times.

Qian, 82, an academician of both the Chinese Academy of Sciences and the Chinese Academy of Engineering, received the 2018 State Preeminent Science and Technology Award during a conference at the Great Hall of the People in Beijing on Tuesday.

The "Underground Steel Great Wall" is a series of defense facilities located deep under mountains. While the mountain rock is thick enough to resist enemy attacks, entrances and exits of these facilities are often vulnerable and Qian's work was to provide extra protection for these parts.

China's nuclear strategy follows the principle of "no first use" and requires the country to have the capability of withstanding a nuclear attack before it responds with its strategic weapons.

Qian's work guaranteed the safety of the country's strategic weapons, launch and storage facilities as well as commanders' safety during extreme times, said Song Zhongping, a military expert and TV commentator.

In an exclusive interview with the Global Times on Friday, Qian describes his work, the "Underground Steel Great Wall," as the "country's last national defense line."

If other lines of defense including the strategic missile interception system, anti-missile system and air defense system fail to function against hypersonic missiles and recently developed bunker-busters, Qian's work can still thwart such attacks.

"The development of the shield must closely follow the development of spears. Our defense engineering has evolved in a timely manner as attack weapons pose new challenges," Qian said.

According to the academician, hypersonic weapons that move 10 times as fast as the speed of sound are capable of changing trajectory mid-flight and penetrate any anti-missile installations.

US media outlet CNBC reported that in March 2018 during a State of the Nation address, Russian President Vladimir Putin debuted new nuclear and hypersonic weapons, which he described as "invincible."

The US is also trying to develop hypersonic weapons, as then US Deputy Secretary of Defense Patrick Shanahan, now acting secretary of defense, said in October. "We are going to fly sooner and more often than people have ever expected," CNBC reported.

Emerging challenges
National defense challenges do not only emerge from the development of advanced attack weapons but are also a result of an unpredictable international environment, Qian said.
He cited the recent US stance whereby the Donald Trump administration is mulling lowering the threshold for nuclear weapons deployment.

The US is planning to loosen US nuclear weapons constraints and developing low-yield nuclear warheads, the Wall Street Journal reported in January 2018.

It is highly possible that US weapons with low-yield nuclear warheads are bunker-busters, with a higher surgical strike capability that may cause larger damage, military experts previously noted, warning that China should stay alert and upgrade its own national defense.

Qian has also provided advice on civilian construction projects, including the Nanjing Yangtze River Tunnel, the Hong Kong-Zhuhai-Macao Bridge and the giant South-to-North Water Transfer Project, according to a China Global Television Network report.

Asked how he would spend the 8 million yuan cash award, Qian said that part would go to research on national defense, and the rest used for social welfare projects such as fighting poverty and supporting poor students.

"I have never had a thought of earning any prize money for my research, nor would I think it came too late," Qian said. "I am only grateful that national recognition offers a great opportunity to raise the public's national defense awareness."
Thanks for posting the interesting article on the two experts along with the footage link and description. For the 39-min CCTV's footage, the program name 《大家》should be translated as the 【Great Master】. Unfortunately it comes with no Engsub.
 
.
Chinese radar firm gives a glimpse on future AEW aircraft
By Liu Xuanzun Source:Global Times Published: 2019/7/17 19:23:40

43e82b87-8691-4c32-8f3e-0754e2733d2f.jpeg
A KJ-200 airborne early warning (AEW) aircraft attached to a Navy aviation regiment under the PLA Northern Theater Command soars over the sky of Jiaodong Peninsula, east China's Shandong province during an air patrol mission in the 2018 Spring Festival holiday. Photo:eng.chinamil.com.cn

Future airborne early warning (AEW) aircraft could become unmanned, interconnected and highly intelligent, and will no longer need the traditional mounted radome, giving their greater aerodynamic and stealth capabilities, said China's top radar firm. Chinese military observers said on Wednesday that China is likely developing such aircraft.

In an article introducing AEW system aircraft written by the 14th Research Institute of China Electronics Technology Group Corporation (CETC) and posted on its public WeChat account on Tuesday, the company not only gave an overview on the history and facts of AEW carrying aircraft around the world, but also shared its vision on how this type of warplane could develop in the future.

Future AEW aircraft will become conformal, meaning antennas and sensors will be integrated into the aircraft's fuselage, the article said, noting that this will contribute to the warplane's aerodynamic and stealth capabilities and allow it to carry larger payloads.

AEW system aircraft usually have a radome -- where antennas and sensors are stored -- mounted on top of its fuselage. A military expert who asked not to be named told the Global Times that this structure results in extra air drag and reflects more radar waves, making the aircraft cumbersome and easy to detect.

Future AEW aircraft will be more interconnected to a combat network, making it capable of receiving data from land, sea, air and space-based platforms, which can then provide support to combatants, according to the CETC article.

The article gave this example: A fighter jet could use target information received from AEW aircraft to deliver a strike without using its own radar, which could be suppressed in electronic warfare or intentionally shut down to maintain stealth, analysts said.

Radars on AEW aircraft will also become smarter, allowing them to scan and identify targets intelligently, while independently protecting themselves from jamming, the article said, adding they will also be able to better allocate resources and will be more user-friendly.

Without a human pilot or crew, the aircraft will likely be smaller and stealthier, the article said.

China now operates multiple types of AEW aircraft including the KJ-200, KJ-500 and KJ-2000. CETC previously announced it has developed unmanned AEW aircraft, the JY-300.
 
.
Control the flow of light: Nature-inspired nanostructure created
Posted 4 days ago

The catenary is the curve that a free-hanging chain assumes under its own weight. It is a “true mathematical and mechanical form” in architecture described by Robert Hooke in the 1670s. The catenary could be found in many circumstances. For example, the silk on a spider’s web form multiple elastic catenaries. The catenaries are also widely used in architectures to construct bridges and arches.

illustration-of-optical-catenaries-for-the-OAM-generation-720x480.jpg

Figure: An illustration of optical catenaries for the OAM generation. When a light beam incident on the catenary structures, orbital angular momenta are transferred from the structure to photons. This process is independent of the wavelength. Credit: SKLOTNM, Chinese Academy of Science

In an article published in Science Advances, a journal established by the American Association for the Advancement of Science, Prof. Xiangang Luo from the Chinese Academy of Sciences and the co-workers have now demonstrated that ultrathin and lightweight optical devices could be constructed using nanostructures catenaries.

The researchers use optical catenary-shaped structures to convert circularly polarized light to helically-phased beam that carrying geometric linear phase profile. Similar to the “catenary of equal strength”, the phase gradient of the optical catenary is equal everywhere, which is a direct result of its special geometric shape. “The catenary structure could find applications in optics, architectures, and many other disciplines. This means that we could construct novel optical devices with strong similarity to the structures occurring in the natural world.” Prof. Luo explains.

Many previous methods used discrete nanostructures to generate space-variant phase distribution. The discrete structures lead to strong resonance, which makes the operating bandwidth of these samples limited. Prof. Luo’s group therefore uses the continuous catenary structures to obtain much broader bandwidth. They demonstrated that broadband orbital angular momentum (OAM) could be achieved by using the catenary array. The operating bandwidth of the devices could covers the entire electromagnetic spectrum ranging from microwave, terahertz, and infrared to the visible regime.

The catenaries could be used as a unique building block for optical metasurfaces, which are thought to be the key of the next-generation integrated optical systems. According to the metasurface-assisted law of reflection and refraction, many novel optical elements, such as flat lenses, axicons, and prisms, could be obtained with performance far beyond their traditional counterparts. Prof. Luo says, “The method of using catenary nanostructures to modulate phase works in many different cases. On the one hand, these nanostructures are natural candidates for the light manipulation on the nanoscale. On the other hand, when these structures are fabricated on flexible substrate, very lightweight and large-aperture lens could be realized. Such lenses make very large space telescopes become possible.”

Paper information: M. Pu, X. Li, X. Ma, Y. Wang, Z. Zhao, C. Wang, C. Hu, P. Gao, C. Huang, H. Ren, X. Li, F. Qin, J. Yang, M. Gu, M. Hong, X. Luo, Catenary optics for achromatic generation of perfect optical angular momentum. Sci. Adv. 1, e1500396 (2015). DOI: 10.1126/sciadv.1500396

Control the flow of light: Nature-inspired nanostructure created - Technology Org
Chinese scientists hail ‘incredible’ stealth breakthrough that may blind military radar systems
  • Researchers at academy of science believe electromagnetic wave model is key that will herald new era in radar detection and avoidance for military ships and aircraft
Stephen Chen
Published: 1:00am, 19 Jul, 2019

Chinese scientists have achieved a series of breakthroughs in stealth materials technology that they claim can make fighter jets and other weaponry lighter, cheaper to build and less vulnerable to radar detection.

Professor Luo Xiangang and colleagues at the Institute of Optics and Electronics, Chinese Academy of Sciences in Chengdu, Sichuan province, said they had created the world’s first mathematical model to precisely describe the behaviour of electromagnetic waves when they strike a piece of metal engraved with microscopic patterns, according to a statement posted on the academy’s website on Monday.

With their new model and breakthroughs in materials fabrication, they developed a membrane, known as a meta surface, which can absorb radar waves in the widest spectrum yet reported.

At present, stealth aircraft mainly rely on special geometry – their body shape – to deflect radar signals, but those designs can affect aerodynamic performance. They also use radar absorbing paint, which has a high density but only works against a limited frequency spectrum.

In one test, the new technology cut the strength of a reflected radar signal – measured in decibels – by between 10 and nearly 30dB in a frequency range from 0.3 to 40 gigahertz.

A stealth technologist from Fudan University in Shanghai, who was not involved in the work, said a fighter jet or warship using the new technology could feasibly fool all military radar systems in operation today.

“This detection range is incredible,” the researcher said. “I have never heard of anyone even coming close to this performance. At present, absorbing technology with an effective range of between 4 and 18 GHz is considered very, very good.”

The lower the signal frequency, the longer a radar’s detection range. But detailed information about a moving target can only be obtained with higher frequency radio waves. Militaries typically use a combination of radars working at different frequencies to establish lines of defence.

The Medium Extended Air Defence System, Nato’s early warning radar, operates at a frequency range of 0.3 to 1 GHz. The American Terminal High Altitude Area Defence system, the missile defence radar that caught Beijing’s attention when it was deployed in South Korea in 2017, operates at frequencies around 10 GHz.

Some airports use extremely short-range, high-frequency radars running at 20 GHz or above to monitor vehicle and plane movements on the ground, but even they might not be able to see a jet with the new stealth technology until it is overhead.

“Materials with meta surface technology are already found on military hardware in China, although what they are and where they are used remains largely classified,” the Fudan researcher said.

f555c84c-a857-11e9-862b-600d112f3b14_1320x770_074918.jpg
Professor Luo Xiangang. Photo: Baidu

Luo and his colleagues could not be reached for comment. But according to the academy’s statement and a paper the team published in the journal Advanced Science earlier this year, the stealth breakthroughs were based upon a discovery they made several years ago.

They found that the propagation pattern of radio waves – how they travelled – in extremely narrow metallic spaces was similar to a catenary curve, a shape similar to that assumed by chains suspended by two fixed points under their own weight.

Inspired by catenary electromagnetics, the team developed a mathematical model and designed meta surfaces suitable for nearly all kinds of wave manipulation.

These included energy-absorbing materials for stealth vehicles and antennas that can be used on satellites or military aircraft.

Zhu Shining, a professor of physics specialising in meta materials at Nanjing University, said the catenary model was a “novel idea”.

“The Institute of Optics and Electronics in Chengdu has conducted long-term research in this area which paved a solid foundation for their discoveries. They have done a good job,” Zhu said.

“Scientists are exploring new features of metal materials, some of them are already in real-life applications.”


Chinese scientists hail ‘incredible’ stealth breakthrough that may blind military radar systems | South China Morning Post

advs201970038-gra-0001-m.jpg
 
. .
. . . . . . . . . .
Back
Top Bottom