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双基地多输入多输出(MIMO)系统需要对目标的波达角和波离角进行二维估计,针对高分辨算法中阵列协方差矩阵处理运算量大以及估计性能对阵列流形失配敏感的缺陷,提出了一种基于二阶锥规划的抗阵列流形失配的双基地MIMO虚拟阵列波束优化算法.该方法利用MIMO的波形分集技术与双基地的目标定位解算,通过波达角和波离角在双基地定位椭圆上的对应关系,将双基地MIMO的二维合成方向矢量转化为一维的虚拟阵列流形,并证明了双基地MIMO虚拟阵列的波束图等效为发射波束图在接收阵角度域上的响应和接收波束图的合成.在优化波束图旁瓣的同时,该算法兼顾了固定方向上的相干干扰抑制,并提高了双基地MIMO虚拟阵列波束优化抗阵列流形失配的能力.通过波束图和方位谱优化的仿真分析和水池试验,验证了算法的有效性.
Binary multiple input multiple output (MIMO) system needs two-dimensional estimation of the DOA and DOA of the target. In view of the large computational complexity of the array covariance matrix processing in the high resolution algorithm and the sensitive performance of the estimation performance to the array manifold mismatch This paper proposed a beamforming algorithm based on second-order cone to solve the mismatch of bistatic MIMO virtual array with array manifold mismatch. This method uses MIMO waveform diversity technology and bistatic target positioning algorithm, The corresponding relationship between the wave and the positioning bisectric ellipse is proposed. The two-dimensional synthesized directional vector of bistatic MIMO is transformed into a one-dimensional virtual manifold. It is also proved that the beam pattern of the bistatic MIMO virtual array is equivalent to the transmitted beam pattern In the angle domain of the receiving array, the response and the combination of the received beam pattern are optimized.While the side lobe of the beam pattern is optimized, the proposed algorithm balances the interference suppression in the fixed direction and improves the anti-array manifold of the bistatic MIMO virtual array beamforming Mismatched ability.The effectiveness of the algorithm is verified by simulation analysis of beam pattern and azimuth spectrum optimization and pool test.