球载雷达多杂波自适应抑制

Multi-clutter Adaptive Suppression of Ball-borne Radar

与常规雷达相比球载雷达面临特殊的杂波环境,由于平台的无规则运动其地杂波不再固定而是与云雨杂波类似具有未知的频谱特征,所以其面临多个未知混合杂波,不能像常规雷达一样先滤除地杂波再抑制运动杂波。本文采用可以同时抑制多个杂波的特征矢量法构造滤波器系数,用相关函数法估计杂波频谱特征以实现自适应杂波抑制。首先从理论上讨论了滤波器权矢量的计算方法,针对该方法在抑制多个具有不同频谱特性的杂波时性能恶化的问题,对该方法进行了改进,分析了其性能优越性。推导了多杂波估计相关理论,针对谱宽偏差较大问题,提出了频宽覆盖法来减小误差的影响。

Compared with conventional radar,the ball-borne radar faces a special clutter environment.Because the irregular moving ground clutter of the platform is no longer fixed,but has similar unknown spectral characteristics as the cloud rain clutter,it faces multiple unknown mixed clutter. It is not possible to filter ground clutter and then suppress motion clutter like a conventional radar. An eigenvector method can suppress multiple clutter and at the same time is applied to construct the filter,and the correlation function method is adopted to estimate the spectral characteristics of the clutter to achieve adaptive clutter suppression. Firstly,the computing method of filter vector is discussed theoretically. The performance of this method is improved when the performance of several methods with different spectral characteristics is suppressed. The performance superiority is analyzed. The theory of multi-clutter estimation is deduced. For the problem of large spectral width deviation,the bandwidth coverage method is proposed to reduce error influence.