临近空间MIMO STAP阵列优化和正交编码分集研究

Array Optimization and Orthogonal Codes Diversity For Near Space MIMO STAP

临近空间MIMO雷达可实现高分辨率、大测绘带成像和高性能动目标显示功能。针对MIMO雷达动目标显示中均匀阵列性能较差、稀疏阵列会导致栅瓣进而出现盲速和一定尺寸平台上天线长度受限的问题,提出了以降低最小可检测速度为准则的MIMO天线阵列优化设计方法,通过对长度限制条件下的发射、接收天线阵列的联合优化,结合具有良好自相关和互相关性能的二相编码正交信号,实现了尺寸受限平台上MIMO雷达STAP功能。仿真比较分析了不同天线阵列结构下的STAP性能,验证了本文方法的有效性。

Near-space radar can implement high-resolution, large-swath imaging and Moving Target Indication （MTI） tasks. For the MTI function of MIMO（ Multiple Input Multiple Output） Radar, uniform array can bring poor performance, sparse array will bring grating lobes which will lead to blind speeds, size-fixed platform limits the maximum length of the ar- ray, this paper proposes one array optimization method whose target is to lower the Minimum Detectable Velocity（MDV）. Combining the joint optimized array structure together with binary phase orthogonal codes which are designed to get high au- tocorrelation and cross-correlation performance, high STAP （ Space-Time Adaptive Processing） performance is gotten with limited aperture length. Simulation compared different STAP performance of various array structure, thus testified the effec- tiveness of the method.