阵列误差条件下MIMO 雷达测向敏感性分析*

测向敏感性分析对高性能阵列雷达系统设计和参数校正具有重要意义。针对MIMO 雷达系统误差 的测向敏感性问题,基于MUSIC 算法的一阶泰勒展开,研究了由MIMO 雷达收、发阵元幅度、相位和位置误差引起的 实际阵列与理想阵列间存在的流型误差对测向性能的影响;三种误差条件下分别定义和推导了任意阵型配置下MIMO 雷达测向敏感因子、方位估计RMSE 以及成功分辨误差门限的表达式。仿真实验验证了理论推导和分析方法的 有效性,相关结论可为MIMO 雷达系统分析与设计提供参考。

Analysis on Direction Finding Sensitivity of MIMO Radar with System Errors

Direction finding sensitivities (DFSs) analysis is an integral part of the high-performance radar system design and calibration of various parameters. Based on the first-order sensitivity analysis of MUSIC algorithm to system errors (SEs) which causes differences between the array manifold used by MUSIC and the true array manifold, the direction finding sensitivity for colocated MIMO radar is investigated. The performance of direction finding in the presence of phase, gain or location errors of the element in transmitting and receiving array and the effect of virtual extend ability for MIMO radar with respect to system errors is further analyzed and tested by simulation. Additionally, for a given arbitrary antenna geometry, the formulas of DFSs and MSEs for MIMO radar using MUSIC algorithm are developed for relatively small SEs. And the formula for computing the ambiguity thresholds of the MUSIC algorithm as a function of target separation and other DF system parame ters are derived for relatively large SEs. The presented analysis methods and related conclusions could be as the complement of MIMO radar system analysis and design.