接收相参雷达相干检波改进设计与仿真

Quadrature Demodulation Improving Design and Simulation for Coherent-on-Receive Radar

为提高传统雷达信号处理系统的性能,提出雷达中频信号数字正交解调和相参信号的提取方法。对接收相参雷达相干检波进行改进研究,采用中频采样和数字正交解调代替模拟相干检波器,采用数字混频滤波提取发射信号初始相位,并采用某型接收相参雷达实际采集信号进行了仿真验证。仿真结果表明:改进后雷达信号处理效果有明显提升,改进方案对早期雷达数字化改造和现代雷达信号处理系统设计具有借鉴意义。

In order to improve the performance of signal processing system in traditional radar,the IF digital quadrature demodulation and the coherent signal getting method is introduced The improving method of coherent detection for coherent-on-receive radar is studied,analog coherent detector is replaced by IF sampling and digital quadrature demodulation,digital mixer and filter is used to get the original phase of transmitting signal.Simulation is made with real signal of coherent-on-receive radar,and the result indicates that the signal processing effect is greatly improved and shows that this new method is valuable for the digital update of some early stage radar and the design of modern radar signal processing system.