大斜视角下空时编码成像算法

摘要

Space-time coding techniques are used to mitigate cross-correlation in the multiple-input multiple-output radar.However, the imaging algorithms based on the conventional space-time coding schemes cannot accurately compensate the range-azimuth coupling,which limits the ability to handle the radar data acquired at high squint angles.To avoid the above drawback, a space-time coding scheme combined with ωK algorithm was proposed.In the space-time decoding processing, the modified decoding matrix and Stolt mapping operation were introduced to achieve the bulk focusing and differential focusing simultaneously, and the range-azimuth coupling could be accurately compensated.Theoretical analysis and simulation results show that the high quality imaging in the case of high squint angles can be achieved by the proposed scheme,and the cross-correlation interference can be canceled.%空时编码可以有效地消除多发多收雷达的自相关干扰,但是传统的空时编码合成孔径成像算法无法精确校正其距离方位耦合,因此限制了其在大斜视角情况下的数据处理能力.为避免以上缺陷,将空时编码方案与ωK算法相结合,在空时解码处理中引入新的解码矩阵来完成一致聚焦,利用Stolt映射完成补余聚焦,对距离方位耦合进行精确地校正.理论分析和仿真结果表明:该方法能够在大斜视角情况下实现目标的高质量成像,并有效地消除了互相关干扰.