分布式雷达主瓣间歇采样转发干扰抑制方法

主瓣间歇采样转发干扰是一种相干干扰，且该干扰从天线主瓣注入雷达，会严重影响雷达的性能。本文首先建立一发多收分布式雷达系统；并建立目标、间歇采样转发干扰数学模型；随后提出一种通过干扰辨识来估计纯干扰协方差矩阵的最小方差无失真(MVDR)抗干扰方法。通过对雷达回波脉压后的一维距离像作时频分析，并根据目标、干扰信号的时频特性差异来辨识目标与干扰，在此基础上，估计纯干扰信息，作为MVDR波束形成器的训练样本，实现对主瓣间歇采样转发干扰的抑制。最后，通过仿真验证了该方法的有效性。 

Main-Lobe Interrupted Sampling Repeater Jamming Suppression Method in Distributed Radar

The main-lobe interrupted sampling repeater jamming is a kind of coherent jamming. This jamming is injected into the radar from the main lobe of the antenna, which will seriously degrade the performance of the radar. In this paper, for the distributed radar system with single transmitter and multiple receivers, a mathematical model containing the target signal and interrupted sampling repeater jamming is established. Moreover, an anti-jamming method based on minimum variance distortionless response (MVDR) is proposed. The pure interference covariance matrix is estimated by jamming recognition. The time-frequency analysis is performed on the one-dimensional range profile, and the target and the jamming can be identified according to their time-frequency characteristics. After this, the pure interference information is estimated as the training data of MVDR beamformer, suppressing the interrupted sampling repeater jamming. Finally, the simulation results are given to demonstrate the effectiveness of our method.