机载前向阵雷达近程杂波频移补偿

基于机载前向阵雷达在近距离地面目标检测时,杂波在距离上将呈现严重的非平稳性,提出了一种向量相似度准则,从杂波样本数据中计算补偿量的多普勒频移补偿方法。利用该方法对不同距离的杂波数据进行相应的频移变换预处理后,能有效改善近程地杂波的非平稳性。该算法在脉冲域和多普勒域中等效,适合并行运算,具有实现简单的优点。仿真结果表明经此方法预处理后的空时自适应滤波,能显著提高系统的性能改善因子。

Doppler Compensation in Airborne Forward-Looking Radar for Ground Short Range Clutter

In the ground short range target detection of airborne forward-looking arrays, the clutter Doppler frequency highly depends on range. A Doppler compensation method based on vector similarity criteria is proposed, which can estimate the compensation values from the received clutter data. The Doppler compensation, as a pre-processing of space time adaptive processing (STAP) corresponding to clutter data of various range bins, can be utilized for efficient solution of the ground short range clutter nonhomogeneous problem. The method in the pulse domain has the same impact as in Doppler domain and is suitable for parallel implementation; moreover, it has the advantage of low complexity. The simulation shows that a high performance improvement factor can be obtained when it is applied to the pre-processing of STAP.