Yang Dengcai, Zhang Ya, Yang Feng, Yang Mei, Cao Yinhua
School of Physics and Optoelectronic Engineering, Institute of Laser Engineering, Beijing University of Technology, Beijing 100124, China.
Micromachines (Basel). 2024 Aug 27;15(9):1080. doi: 10.3390/mi15091080.
A novel photonic-assisted multifunctional radar system was proposed and experimentally investigated. This system can simultaneously achieve frequency-doubled linear frequency modulation (LFM) signal generation, de-chirp reception, self-interference cancellation, and frequency measurement in an integrated transmit-receive radar. First, a high-frequency and broadband LO signal was obtained with photonic frequency doubling, which improved the center frequency and bandwidth of the radar detection system. Then, photonic-assisted interference cancellation was used to reduce the impact of interference signals in radar de-chirp reception. Finally, the microwave frequency measurement was achieved by establishing a mapping relationship between the envelope response time of the intermediate frequency (IF) electrical filter and the microwave frequency to be tested. Both theoretical and experimental investigations were performed. The results showed that an LFM signal with a frequency range of 12-18 GHz was obtained with photonic frequency doubling. Photonic-assisted self-interference cancellation reduced the impact of interference signals in radar de-chirp reception by more than 12.1 dB for an LFM signal bandwidth of 6 GHz. In the frequency measurement module, the difference between the frequency to be tested, generated by the external signal source, and that calculated in the experiment is the measurement error, and a measurement resolution better than 14 MHz was achieved in the range of 12.14 GHz-18.14 GHz. The proposed system is suitable for miniaturized multifunctional radar signal processing systems with continuous operation of transmitting and receiving antennas in unmanned aerial vehicles (UAVs), automotive radar, relatively close spatial locations, and so on. In addition, it can simplify the system structure and reduce space occupation.
提出并实验研究了一种新型光子辅助多功能雷达系统。该系统能够在集成收发雷达中同时实现倍频线性调频（LFM）信号产生、去啁啾接收、自干扰消除和频率测量。首先，通过光子倍频获得高频宽带本振（LO）信号，提高了雷达探测系统的中心频率和带宽。然后，利用光子辅助干扰消除来降低雷达去啁啾接收中干扰信号的影响。最后，通过建立中频（IF）电滤波器的包络响应时间与待测微波频率之间的映射关系实现微波频率测量。进行了理论和实验研究。结果表明，通过光子倍频获得了频率范围为12 - 18GHz的LFM信号。对于带宽为6GHz的LFM信号，光子辅助自干扰消除在雷达去啁啾接收中降低干扰信号的影响超过12.1dB。在频率测量模块中，由外部信号源产生的待测频率与实验计算频率之间的差值为测量误差，在12.14GHz - 18.14GHz范围内实现了优于14MHz的测量分辨率。所提出的系统适用于无人机（UAV）、汽车雷达、空间位置相对较近等具有收发天线连续工作的小型化多功能雷达信号处理系统。此外，它可以简化系统结构并减少空间占用。
