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机载多通道阵列雷达天线在工程实践中不可避免地存在各类阵元误差,所产生的通道失配问题会对空时二维自适应处理的性能造成大的影响。对存在阵元误差时的阵列信号模型进行了分析,提出了一种基于协方差矩阵加权(CMT)的阵元误差补偿空时自适应处理(STAP)方法,在工程应用中该加权矩阵可通过地面天线定标及校飞过程确定,通过对总干扰协方差矩阵估计的加权预处理,可将实际阵元误差对STAP性能的影响控制在测量误差的影响范围,最后通过仿真验证了算法的有效性。
Airborne multi-channel array radar antennas inevitably have various types of array element errors in engineering practice. The resulting channel mismatch problem will greatly affect the performance of two-dimensional space-time adaptive processing. An array signal model with array element errors is analyzed, and an array element error compensation space-time adaptive processing (STAP) method based on covariance matrix weighting (CMT) is proposed. In engineering applications, the weight matrix can be obtained by Ground antenna calibration and calibration process. Through the weighted preprocessing of total interference covariance matrix estimation, the influence of actual array element error on STAP performance can be controlled in the range of measurement error. Finally, the simulation results show that the algorithm is effective Sex.