基于相位分集的目标极化特征检测方法

A Target Detection Method with Polarization Characteristic Based on Phase Diversity

雷达主瓣压制干扰具有接收功率大、时-频-空域难以分离的特点,是雷达探测的重要威胁。已有文献提出基于极化-空间谱特征从主瓣干扰中检测目标的方法,但在主瓣多紧邻干扰、变极化干扰等情况下误判率难以忍受。针对这一问题提出了基于雷达发射极化均匀相位分集,利用到达信号极化散度特征和极化分布特征进行联合判别的方法,能够有效降低主瓣多紧邻干扰、变极化干扰背景下的误判率。理论分析和仿真结果均表明了该检测方法的良好性能。

The barrage interference located in radar mainlobe has the characteristics of large receiving power and the difficulty to separate from the target in time,frequency and special.It is an important threat to radar detection.A method has been proposed to detect targets from mainlobe interference based on polarization-space spectral characteristics.However,when there are multiple adjacent interferences or variable polarization interference,the false alarm rate is unbearable.To solve this problem,a method of joint discrimination based on uniform phase diversity is proposed by using polarization divergence characteristics and polarization distribution characteristic of arrival signal.The theoretical analysis and simulation results show that this method can effectively reduce the misjudgment in the presence of multiple adjacent interference or variable polarization.