距离模糊的机载非正侧面阵雷达杂波谱补偿新方法

A Clutter Spectrum Compensation Method for Non Side-Looking Airborne Radar with Range Ambiguity

机载非正侧面阵雷达地面近程杂波分布具有距离依赖性,使得杂波多普勒在空时平面上分布展宽;当存在距离模糊时,近程杂波和远程杂波混在一起,现有的补偿方法在对近程杂波进行补偿的同时,使得远程杂波的空时分布也发生改变,这严重影响空时自适应处理(STAP)的性能.针对该问题,本文提出了一种基于RBC方法的距离模糊杂波补偿方法,该方法增加了对远程杂波数据的约束保护,使得该方法在补偿近程杂波距离依赖性的同时,能够保证远程杂波的空时分布不发生改变;并且当存在阵元误差时,该方法依然能够获得良好的补偿性能.计算机仿真结果验证了本文方法的有效性.

The ground clutter of the non side-looking airborne radar（non-SLAR） is range-dependent,which makes the ground clutter Doppler distribution widen in the space-time domain.When the range ambiguity is considered,the short and far slant range clutters are mixed.Although the existing range-dependence compensation methods can mitigate the range-dependence of the short slant range clutter,they change the space-time distribution of the far slant range clutter.It severely decreases the performance of the space-time adaptive processing（STAP）.We propose a range ambiguity clutter compensation method which adds the constraint protection of the far slant range clutter based on the registration-based method（RBC）.When the proposed method is applied to the range ambiguity clutter,it can not only mitigate the range dependence of the short slant range clutter,but also keep the distribution of the far slant range clutter unchanged.Moreover,the proposed method can achieve good performance when the antenna error exists in the clutter data.The computer simulation results show the validity of the proposed method.