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宽带数字阵列雷达接收通道中存在随频率变化的幅相误差和互耦误差,会严重影响雷达性能。针对这一问题,提出了一种宽带数字阵列幅相与互耦误差联合校正算法。首先选取通带内多个离散频点,对于每个频点,将幅相误差和互耦误差作为一个整体,采用基于子空间原理的窄带校正算法估计其阵列失真参数,并计算校正矩阵;然后将其组合起来,构成频域离散校正矩阵;最后基于最小二乘准则,设计了宽带有限长脉冲响应(FIR)校正滤波器矩阵。利用该矩阵,可实现通带范围内任意带宽入射信号的校正。计算机仿真实验验证了该算法的有效性。对实测数据的处理结果表明该算法在宽带数字阵列雷达系统中具有实用价值。
Broadband digital array radar receiver channel with amplitude and phase error and mutual coupling error, will seriously affect the performance of the radar. Aiming at this problem, a joint correction algorithm of amplitude and phase coupling error of wideband digital array is proposed. Firstly, several discrete frequency points in the passband are selected. For each frequency point, the phase error and the mutual coupling error are taken as a whole. The narrowband correction algorithm based on subspace theory is used to estimate the array distortion parameters and the correction matrix is calculated. Then Combining them to form the frequency domain discretization correction matrix. Finally, based on the least squares criterion, a broadband finite impulse response (FIR) correction filter matrix is designed. Using this matrix, correction of incident signals of any bandwidth in the passband range can be achieved. Computer simulation experiments verify the effectiveness of the algorithm. The processing results of measured data show that the algorithm has practical value in wideband digital array radar system.