MIMO双基地机载雷达距离模糊杂波抑制方法

摘要

The ground clutter of sidelooking Multiple-Input Multiple-Output (MIMO) bistatic radar has severe problems of range-dependence and clutter spectrum spreading. In this paper, the clutter characteristics of bistatic airborne radars are analyzed and a method of range-ambiguous clutter suppression is proposed. This method employs the range-dependent phase term in the traditional MIMO bistatic radar to provide extra degrees of freedom. The range information of the phase term enables clutter separation with different ranges and consequent suppression. Thus, a range-ambiguous clutter suppression for bistatic airborne early warning radars is achieved. The simulation results show the accuracy of the method. By a comparison with the existing Doppler Warping (DW) and clutter suppression method with the Improved Factor (IF) line, the results showed that the method has better performance, which proved the effectiveness of ambiguous clutter suppression in MIMO bistatic radars.%正侧视阵MIMO(Multiple-Input Multiple-Output)双基地雷达系统具有严重的距离依赖问题和杂波谱展宽现象,该文分析其杂波特性,提出了一种距离模糊杂波抑制方法.该方法在传统的MIMO双基雷达中引入距离相关的相位项,从而提供额外的自由度,通过该相位项的距离信息实现不同距离的杂波分离,并进一步对其进行有效抑制.从而解决了双基地预警雷达大场景下地面杂波距离杂波模糊的问题,仿真结果显示该方法的正确性,并且和已有的DW(Doppler Warping)距离模糊杂波抑制方法进行比较,使用IF(Improve Factor)谱线对抑制结果进行对比,显示该方法有更优的性能.