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China develops prototype of microwave photonics-based radar
By Song Shengxia Source:Global Times Published: 2017/6/13 23:33:39


China has developed its first prototype of microwave photonics-based radar and completed the imaging test, which analysts said could revolutionize the imaging performance and applications of the radar system and enhance the country's national security.

In the external field tests on aircraft including Boeing 737, the microwave photonics-based radar prototype which adopts the bistatic radar system and photon structure can clearly identify the structural details of the objects including the aircraft engine, tail section and flap track, the Institute of Electronics under the Chinese Academy of Sciences said in a statement on its website on Monday.

Compared with traditional radar models, the microwave photonics-based radar can produce and process radar wideband signals more efficiently and faster by leveraging the rich spectral resources and photonic technologies, the Science and Technology Daily reported Monday.

The new radar prototype can capture images of high resolution, which is significantly higher than the images detected by radar of the similar models in the international arena, the report said.

"The new radar prototype marks a milestone in China's development of radar technology. By identifying the aircraft engines, the microwave photonics-based radar demonstrates its strong penetrating performance," Li Daguang, a professor at the National Defense University of the People's Liberation Army, told the Global Times on Tuesday.​

If the system is used in military applications, it could significantly enhance the country's ability to safeguard its national security as the system can help identify the types of vehicles or objects in a long distance such as jet fighters or bomb carriers, he added.


中国第一台微波光子雷达诞生 图像分辨率比国际高一个数量级
科技日报6月12日报道,中科院电子学研究所网站12日披露,该所成功研制出我国第一台微波光子雷达样机,并通过外场非合作目标成像测试,获得国内第一幅微波光子雷达成像图样,在图像分辨率上比国际水平高出一个数量级。

微波光子雷达作为前沿科技项目,是结合了微波光子技术和雷达技术的多学科交叉领域,微波光子雷达作为雷达发展的新形态,能有效克服传统电子器件的技术瓶颈,改善和提高传统雷达多项技术性能,为雷达等电子装备技术与形态带来变革。

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微波光子技术在电子系统中的发展历程

微波光子学最早的应用起源于70年代,应用于对太空的通讯。而微波光子雷达最早的研究开始于1995年。

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世界上第一部真正算得上微波光子雷达样机的是2009年启动的意大利PHODIR项目,2013年实现对非合作民航客机的跟踪和测量

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到2016年5月,世界首部双波段微波光子雷达实现了对空中和海上非合作目标的ISAR成像。

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图为:(A)波音737-800飞机,(B)和(C)是利用S波段和X波段对该飞机的ISAR成像结果;(D)目标油轮,(E)和(F)是S波段和X波段对油轮的ISAR成像结果

而此次中科院电子所成功研制了国内首部微波光子雷达样机。样机并进行了外场非合作目标的逆合成孔径成像测试,获得了国内第一幅微波光子雷达成像图样,推动了新技术新体制雷达研究的发展。

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中国首部微波光子雷达采用双站雷达体制和光子架构,在发射机和接收机的射频前端分别引入雷达信号微波光子产生和去调频接收技术,能够支持宽带工作,具有提升距离向分辨率的潜力。外场获得的图像分辨率比已知报道的国际同类微波光子雷达提高一个数量级,图像清晰度也有明显提升。

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对比发表在《自然》杂志上的国外微波光子雷达系统所进行的外场成像结果,如图2所示,电子所的微波光子雷达系统成像结果具有明显的改善

采访过程中,微波光子雷达样机的研制负责人李王哲研究员告诉科技日报记者,研究团队对雷达总体光子架构设计、雷达信号光子产生和光子压缩处理,以及成像算法等关键技术进行了攻关;在经过实验平台原理验证、微波暗室转台实验、系统集成联调和外场试验等一系列测试后,成功实现了对空中随机目标——波音737飞机的快速成像。

在此次外场测试中,对包含波音737飞机在内的不同机型、不同距离、不同视角下进行了成像测试。得益于微波光子雷达架构,以及光子技术在宽带信号产生、处理以及系统杂散抑制等方面的独特优势,微波光子雷达成像快,分辨率高,能够清晰的识别目标的结构细节,比如飞机发动机、尾翼以及襟翼导轨等结构。测试过程充分展示了微波光子雷达对目标结构特征的辨识能力优势。

作为中国科学院电子所一室的重点研究项目,微波光子雷达的研究得到了中科院科技创新重点部署项目、中科院率先行动计划、微波光子成像雷达技术验证测试平台修购项目的支持。电子所微波光子及雷达成像技术研究团队,引进了两位海外青年千人,李王哲研究员和李若明博士入所开展工作。整个研究团队以李王哲研究员牵头,结合一室在雷达技术方面的专业力量和研究经验,通过不同学科间的碰撞融合、不同专业技术人员间的交流协作,有力推动了微波光子雷达研究在一室的发展。

从2015年下半年开始,相关专业团队团结一致,克服困难,协同创新,先后完成了微波光子成像雷达系统设计论证,宽带雷达信号的光子产生和光子去调频接收等关键技术攻关,以及相关成像算法研发。在经过实验室原理验证、暗室点目标成像实验和系统集成联调后,最终实现了在外场对非合作目标的成像测试,成功验证了该部微波光子雷达的可行性。研究成果已经被国际期刊《Optics Express》(《光学快讯》)接收,即将发表。


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李王哲研究员教育背景:

2000-09--2004-06 西安交通大学 本科学士

2004-09--2007-06 清华大学 硕士学位

2007-11--2013-04 渥太华大学 博士学位

研究领域

1. 基于光子技术的合成孔径雷达(SAR)

未来各类先进电子雷达,包括SAR,在带宽、处理速度、体积功耗等各方面因受到传统电子技术的限制而存在发展瓶颈;而利用在借助光通信领域发展而日渐成熟的光子技术,可以突破上述瓶颈,实现更高性能的SAR系统,甚至可以发展为除了成像外,融合其他诸如侦查、通信、干扰等多种功能于一体的先进雷达系统。研究内容主要包括:可调谐宽带光电振荡器;高线性、高动态、宽带微波光子射频前端;基于光子色散的傅里叶变换\反变换系统;光子辅助模数转换系统;微波信号的光子处理技术;基于光载超宽带的分布式雷达等。

2. 基于微波成像的微波光子传感器

借鉴微波成像技术的优良环境适应性,结合微波光子在硬件系统能力上的提升和处理办法上的优化,利用传统微波成像技术和理论,构建微波光子传感器,实现对特定空间域、特定目标的高精度、快速识别。研究内容主要包括:二维\三维微波成像理论;分布式成像;高精度、快速、区域成像算法等。

3. 微波光子模块芯片集成

将传统的基于光纤的微波光子系统,通过成熟的硅基、三五族集成光学技术,小型化、芯片化、低功耗化;是支撑未来先进电子系统的重要支柱。研究主要内容包括:芯片设计;集成微波光子单一功能处理芯片;微波光子接收通道芯片等。

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中科院电子所“海外人才走进科学院”活动暨2016年度青年人才会议,李王哲博士作报告

第一部国内微波光子雷达样机的研制成功填补了国内在该研究领域的空白,推动了光子技术同传统的微波系统尤其是雷达系统的融合,标志着未来的雷达技术和系统的新的发展阶段,为未来新体制雷达系统的诞生奠定基础。接下来该方向的研究工作将进一步提升微波光子雷达成像性能,并继续探索微波光子技术在不同体制雷达中的应用价值。
 
http://www.globaltimes.cn/content/1051535.shtml
China develops prototype of microwave photonics-based radar

China has developed its first prototype of microwave photonics-based radar and completed the imaging test, which analysts said could revolutionize the imaging performance and applications of the radar system and enhance the country's national security.

In the external field tests on aircraft including Boeing 737, the microwave photonics-based radar prototype which adopts the bistatic radar system and photon structure can clearly identify the structural details of the objects including the aircraft engine, tail section and flap track, the Institute of Electronics under the Chinese Academy of Sciences said in a statement on its website on Monday.

Compared with traditional radar models, the microwave photonics-based radar can produce and process radar wideband signals more efficiently and faster by leveraging the rich spectral resources and photonic technologies, the Science and Technology Daily reported Monday.

The new radar prototype can capture images of high resolution, which is significantly higher than the images detected by radar of the similar models in the international arena, the report said.

"The new radar prototype marks a milestone in China's development of radar technology. By identifying the aircraft engines, the microwave photonics-based radar demonstrates its strong penetrating performance," Li Daguang, a professor at the National Defense University of the People's Liberation Army, told the Global Times on Tuesday.

If the system is used in military applications, it could significantly enhance the country's ability to safeguard its national security as the system can help identify the types of vehicles or objects in a long distance such as jet fighters or bomb carriers, he added.


 
http://www.globaltimes.cn/content/1051535.shtml
China develops prototype of microwave photonics-based radar

China has developed its first prototype of microwave photonics-based radar and completed the imaging test, which analysts said could revolutionize the imaging performance and applications of the radar system and enhance the country's national security.

In the external field tests on aircraft including Boeing 737, the microwave photonics-based radar prototype which adopts the bistatic radar system and photon structure can clearly identify the structural details of the objects including the aircraft engine, tail section and flap track, the Institute of Electronics under the Chinese Academy of Sciences said in a statement on its website on Monday.

Compared with traditional radar models, the microwave photonics-based radar can produce and process radar wideband signals more efficiently and faster by leveraging the rich spectral resources and photonic technologies, the Science and Technology Daily reported Monday.

The new radar prototype can capture images of high resolution, which is significantly higher than the images detected by radar of the similar models in the international arena, the report said.

"The new radar prototype marks a milestone in China's development of radar technology. By identifying the aircraft engines, the microwave photonics-based radar demonstrates its strong penetrating performance," Li Daguang, a professor at the National Defense University of the People's Liberation Army, told the Global Times on Tuesday.

If the system is used in military applications, it could significantly enhance the country's ability to safeguard its national security as the system can help identify the types of vehicles or objects in a long distance such as jet fighters or bomb carriers, he added.
Paper:
Ruoming Li, Wangzhe Li, Manlai Ding, Zhilei Wen, Yanlei Li, Liangjiang Zhou, Songshan Yu, Tonghe Xing, Bowei Gao, Yuchen Luan, Yongtao Zhu, Peng Guo, Yu Tian, and Xingdong Liang. Demonstration of a microwave photonic synthetic aperture radar based on photonic-assisted signal generation and stretch processing. Optics express (2017). DOI: 10.1364/OE.25.014334

Abstract
A microwave photonic synthetic aperture radar (MWP SAR) is developed and experimentally demonstrated. In the transmitter, microwave photonic frequency doubling is used to generate a linearly-frequency-modulated (LFM) radar signal; while in the receiver, photonic stretch processing is employed to receive the reflection signal. The presented MWP SAR operates in Ku band with a bandwidth of 600MHz, and is evaluated through a series of inverse SAR imaging tests both in a microwave anechoic chamber and in a field trial. Its imaging performance verifies that the proposed MWP SAR works perfect and shows the potential of overcoming the conventional radar bandwidth bottleneck.​

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Microwave photonic-based radar make stealth aircraft be naked

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Microwave photonic radar prototype to achieve rapid imaging of random targets in the air.

The latest news, CLP 14 developed microwave photon imaging radar, field non cooperative target test, imaging is 30 times higher than similar international military radar resolution, B-2, F-22 and J-20 fighters such as stealth aircraft in the airspace of all radar coverage be naked.

In early May 2017, a news report, the high precision microwave photon imaging radar in 14 research and development success, in June 13th, the Chinese Academy of Sciences Research Website disclosure, CLP 14 has developed China's first high precision microwave photon imaging radar and imaging test by non cooperative target field, at first a microwave photon radar image, the image resolution is 30 times higher than similar international radar, and will continue to enhance the resolution of a number of potential level.

Microwave photon radar random target to Boeing 737 aircraft detection imaging reports disclosed, image drawing speed is very fast, and imaging can identify engine tail flap track and the number of aircraft details.

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Microwave photonic radar imaging patterns can identify, such as the engine,
tail, flap, rail and other aircraft details.

From the above report to the analysis above, China's first high precision microwave photon radar is 30 times higher than that of similar international radar resolution, only some large parts of the aircraft's details respectively, the similar estimation of radar imaging is just a dot.

In high precision microwave photon radar 14 can work all-weather and penetrating, after breaking through the imaging accuracy, slow processing speed and poor real-time difficulties, you can quickly identify the target of fine structure and characteristics, which not only can be used in the real-time identification of combat platform for small target also, it can provide accurate environmental information for unmanned intelligent equipment.

This means that the radar has the ability to detect, track and lock targets, or to solve the current radar can find F-22, F-35 and other stealth fighters can not track the locking problem.

At present, the world's so-called stealth aircraft are not microwave, photon, radar stealth. As China's independent research and development of J-20, American B-2, F-22, F-35, the stealth aircraft, under the radar detection of microwave photonic real no hide, in the detection of microwave photonic radar airspace, the most advanced stealth aircraft are in the class of naked state.

The emergence of a new generation of radar, the era of the fifth generation fighter system may end early. The sixth generation will probably no longer boast what stealth capabilities are, but it will speed up, and hypersonic vehicles are coming.
The United States X series hypersonic vehicle research and development is still in the forefront of the world, China also has mysterious Wu-14 project, and recent news also revealed that China hypersonic engine research and development success.

The most sad reminder may be that Russia, the fifth generation fighter T-50 has not yet delivered, the era of the five generation aircraft will soon be faced with an end. Yes, there are two, five generation aircraft in India may also have an impact, but it should not be big, immediately announced the development of the sixth generation of fighters, for India, there is no difficulty.
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