发射波形任意合成结构下机载MIMO雷达STAP性能分析

输出信杂噪比(SCNRout)是决定机载多输入多输出(MIMO)雷达空时自适应信号处理(STAP)性能的一个重要指标,但是现有的STAP算法均无法准确地给出其理论解析式。针对上述问题,文中研究了发射波形任意合成结构下的机载MIMO雷达衡量STAP性能的SCNRout的精确理论解析式。首先,通过发射波形互相关矩阵和MIMO STAP性能之间的联系,推导得出了SCNRout的理论解析式;然后,基于对该理论解析式的分析,从发射波形任意合成结构这个角度阐述了理想MIMO雷达、MIMO相控阵雷达和相控阵雷达的STAP性能特征。仿真实验表明:推导得出的理论解析式与仿真结果精确一致,并论证分析了机载MIMO雷达STAP处理性能的优越性。所推导的理论解析式对发射波形的优化设计具有重要的参考意义。

Performance Analysis of STAP with Arbitrary Synthetic Structure of Transmitted Waveform for Airborne MIMO Radar

Signal-clutter-noise ratio out ( SCNRout) is an important index that decides the performance of space time adaptive processing ( STAP) in airborne multiple input multiple output ( MIMO) radar, but its theoretic analytic formulation can not be given precisely for the existed STAP algorithms. To solve this problem, the precise theoretic analytic formulation of MIMO STAP algorithm is researched with arbitrary synthetic structure of transmitted waveform. Firstly, based on the direct relationship between the cross-correlation matrix of transmitted waveform and the performance of MIMO STAP, the theoretic analytic formulations of SCNRout, which are used to judge the STAP performance of airborne MIMO radar are deduced. Then based on the comparison and analysis on the theoretic analytic formulations, the STAP performances character of ideal MIMO radar, MIMO phased array ( PA) radar and PA radar are represented through arbitrary synthetic structure of transmitted waveform. Finally, the simulations indicate that the deduced theoretic analytic formulations are consistent precise with the simulated results, and the superiority of MIMO STAP is demonstrated and analyzed. The deduced theoretic analytic formulations are significant for the design of optimal transmitted waveform.