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研究了MIMO雷达GMTI性能及其DOA估计的克拉美.罗界(CRB)。首先建立机载平台下MIMO雷达信号模型,通过对系统参数设置,可使MIMO雷达工作在3种不同模式中。接着分析了MIMO雷达GMTI性能,并推导出了在MIMO雷达空时信号模型下,利用空时联合域信息时DOA估计的CRB。仿真结果表明,无论是GMTI性能还是DOA估计性能,MIMO雷达均优于相控阵雷达,尤其是发射稀疏阵MIMO雷达性能最佳。同时,利用空时联合域信息能有效改善MIMO雷达DOA估计的CRB,在目标多普勒频率相差较大时效果更加明显。
The Cramer-Rao boundary (CRB) of MIMO radar GMTI performance and its DOA estimation are studied. Firstly, the MIMO radar signal model is set up on the airborne platform. By setting the system parameters, the MIMO radar can work in three different modes. Then the GMTI performance of MIMO radar is analyzed, and the CRB of DOA estimation using space-time combined domain information is deduced under MIMO radar space-time signal model. The simulation results show that the MIMO radar is superior to the phased array radar in both the GMTI performance and the DOA estimation performance, especially the sparse-matrix MIMO radar. At the same time, the use of space-time joint domain information can effectively improve the DOA estimation of MIMO radar CRB, the effect is more obvious when the target Doppler frequency is larger.