一种宽带阵列幅相与互耦误差联合校正算法
收稿日期: 2015-05-26
修回日期: 2015-11-19
网络出版日期: 2015-11-25
基金资助
国家自然科学基金(61471373)
Wideband calibration algorithm for amplitude-phase and mutual coupling errors
Received date: 2015-05-26
Revised date: 2015-11-19
Online published: 2015-11-25
Supported by
National Natural Science Foundation of China(61471373)
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。
李卫星 , 张月 , 陈曾平 , 徐世友 . 一种宽带阵列幅相与互耦误差联合校正算法[J]. 航空学报, 2016 , 37(3) : 1025 -1035 . DOI: 10.7527/S1000-6893.2015.0312
The amplitude-phase errors as well as mutual coupling errors, which are frequency-dependent, will deteriorate the performance of wideband digital array radar. In order to cope with the problem, a practical wideband calibration algorithm is proposed. Firstly, the frequency band is decomposed of a series of discrete frequency bins. For each frequency bin, the distortion parameters, including amplitude-phase perturbations and mutual coupling errors, can be estimated by a method based on least-squares criterion. Then the frequency-domain calibration matrix, composed of the calibration matrices at different frequencies, is obtained. Finally we derive the wideband calibration matrix, whose frequency responses are approximate to the narrowband calibration matrixes at all the frequencies. The wideband calibration matrix is capable of calibrating the signals with any frequencies in the band. Simulation results illustrate the effectiveness of the proposed algorithm. The processing results of measured data that are captured by a wideband digital array radar test-bed are presented, demonstrating that the proposed algorithm achieves good performances and is feasible for actual systems.
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