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机载预警雷达发射中高脉冲重复频率信号时,会导致接收杂波存在距离模糊现象。对于机载非正侧视阵雷达(non-side looking airborne radar,non-SLAR),其近程回波具有强烈的距离依赖性,导致通过统计方法估计的杂波协方差矩阵不准确,使得空时自适应处理(space-time adaptive processing,STAP)的杂波抑制性能急剧下降。接收天线为均匀线阵条件下,由于阵列没有俯仰维自由度,无法直接对近程杂波进行抑制。针对这种情况,提出了一种近程杂波对消方法,该方法首先估计出近程模糊距离门对应的俯仰角,然后利用空时二维杂波谱的先验信息对近程的杂波进行估计,最后对原始的接收数据进行近程杂波对消。该方法能够对近程杂波进行有效抑制,获得的杂波抑制性能高于直接处理法。仿真实验结果验证了该方法的有效性。
Airborne early warning radar transmitting medium high pulse repetition frequency signal, will result in receiving clutter there is ambiguous distance. For non-side looking airborne radar (non-SLAR), its short-range echo has a strong distance dependence, resulting in inaccurate clutter covariance matrix estimated by statistical method, The clutter suppression performance of space-time adaptive processing (STAP) decreases sharply. When the receiving antenna is in a uniform linear array, short-range clutter can not be suppressed directly because the array has no pitch-dimensional freedom. Aiming at this situation, a short-range clutter cancellation method is proposed, which first estimates the pitch angle corresponding to the short-range fuzzy distance gate, and then uses the a priori information of the space-time two-dimensional clutter spectrum to detect the short-range clutter Estimate, and finally the original received data for short-range clutter cancellation. This method can effectively suppress short-range clutter and obtain better clutter suppression performance than the direct-process method. Simulation results verify the effectiveness of the proposed method.