强干扰下无源雷达弱目标探测

当存在大型目标、近地机群或欺骗干扰时,无源雷达难以检测弱小目标.基于强信号与照射源发射信号之间的关系,导出了幅度-距离-多普勒曲面与照射源信号自模糊函数的关系,进而提出了在二维FIR(finiteimpulse response)系统辨识基础上抑制强回波以检测弱目标的方法.仿真结果表明,该方法对强信号的抑制超过60 dB;即使弱目标回波信噪比在-24 dB的情况下,也能实现弱目标检测.

Weak Target Detection of Passive Radar in Strong Jamming Environment

It is difficult for a passive radar to detect weak targets under the background of strong jamming coming from large targets,near air fleet or deception jam.Based on the connection between strong and reference signals,the relationship between the amplitude-range-Doppler surface and the ambiguity function of the reference signal was deduced,and a detection method for weak targets was proposed based on two-dimension FIR(finite impulse response) system identification.Simulation results indicate that the proposed method can restrain the strong signal beyond 60 dB,and even to weak targets with an echo SNR(signal to noise ratio) of-24 dB,they can be detected.