Implement method and system of microwave photon radar for small target detection or real-time tracking imaging

Abstract

The invention provides an implement method and system of microwave photon radar for small target detection or real-time tracking imaging. The implement system mainly comprises a transmitter, a receiver and a control and data processing center. According to the transmitter, a continuous single frequency laser is used as light sources of an entire radar system, and then a required high-frequency wide-band radar radio-frequency signal is generated by using an optoelectronic combined high frequency doubling method. The receiver uses an optical signal from the transmitter as an optical local oscillator to perform optical mixing and receiving of radar echo. According to the control and data processing center, the workflow of the entire radar system is controlled and the extraction of target information in an echo signal is realized. The implement method and system utilize the advantages of optical high frequency doubling to generate an ultra-wideband radar signal, the resolution ratio of centimeter or even sub-centimeter magnitude is realized, and identifying of a target feature by imaging a target is sufficient; a multi-branch photoelectric conversion front-end framework is proposed, the potential of an electronic power amplifier is fully exerted, and the requirements of the low-frequency narrow-band remote detection function and the high-frequency wideband short-range imaging function can be met only by branch switching; and the advantages of electric low-frequency high-quality signals and optical wideband compatibility can be simultaneously exerted, and long-distance detectionand close-range real-time imaging supervision of small flying targets such as unmanned aerial vehicles can be realized based on a set of the system.

Description

technical field [0001] The invention relates to the field of microwave photon radar, in particular to a method and system for implementing microwave photon radar for small target detection or real-time tracking and imaging. Background technique [0002] Due to its all-weather and all-weather inherent advantages, radar has always been an effective monitoring tool for flying targets in airspace. The game development between traditional air targets such as fighter jets and cruise missiles and radar is in the ascendant. Emerging UAV technology brings a series of new challenges to national defense airspace security. Security risks. Traditional radars are still unable to achieve effective monitoring in the face of slow and small targets. There are two main reasons: one is that small flying targets such as drones are small in size (meter or even sub-meter level), and traditional radars are limited by bandwidth. It is difficult to monitor its behavior with high-resolution detectio...

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Problems solved by technology

[0003] The world's first microwave photonic technology imaging radar was proposed by the Italian research team (F.Scotti, F.Laghezza, D.Onori, and A.Bogoni,"Field trial of a photonics-based dual-band fullycoherent radar system in a marine scenario, "Iet Radar Sonar Nav 11(3), 420-425(2017).), the radar uses a frequency conversion scheme based on a mode-locked laser to generate a dual-band chirp signal, which realizes effective imaging of cargo ships and civil aviation aircraft, but each The bandwidth of each frequency band is only 18MHz, and the resolution of composite broadband imaging is only in the order of meters

In addition, given the challenge of mode-locked lasers with large mode spacing, this method cannot realize large-bandwidth radar systems and high-precision imaging of small targets.

Li Wangzhe's research group from the Institute of Electronics, Chinese Academy of Sciences reported a microwave photonic imaging radar based on dual-source dual-link architecture and polarization demultiplexing technology (R.Li, W.Li, M.Ding, Z.Wen, Y.Li, L.Zhou ,S.Yu,T.Xing,B.Gao,Y.Luan,Y.Zhu,P.Guo,Y.Tian,and X.Liang,"Demonstration of a microwave photonic synthetic aperture radar based on photonic-assisted signal generation and stretch processing, "Opt.Express 25(13), 14334-14340(2017).), based on the 600MHz bandwidth, the imaging of the 800m distant civil aviation airliner is realized, but the 43cm resolution is still difficult to effectively image the UAV target, and The implementation of dual-link architecture and polarization demultiplexing technology makes the system relatively complex

Pan Shilong's research group at Nanjing University of Aeronautics and Astronautics built a microwa

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