分布式数字相控阵通道一致性校准方法

Calibration of Channel Consistency of Distributed Digital Phased Arrays

基于分布式数字相控阵通道一致性校准需求,提出了一种新的有效解决方法。首先基于时域相干的时延估计算法纠正通道间时延差,而后利用基于最小二乘拟合的频域均衡算法实现通道间幅相一致性校准。利用Matlab平台进行仿真分析,结果表明,利用此方法校正后,失配通道与参考通道在通带内的幅度差值在0.015 dB内,相位差值在0.1°内,有效地实现了通道间一致性校准作用。该方法已成功应用于实际工程项目中。

This paper presents a new effective method for calibration of channel consistency of distributed digital phased array.First,a time delay estimation algorithm based on temporal coherence was used to align big time delay among channels.Then a frequency domain equalization algorithm based on least squares fitting was used to achieve consistency of magnitude and phase among channels.The effectiveness of the above method was validated through analyzing equalization results on Matlab platform.The results showed that the magnitude and phase differences between reference channel and mismatch channel in the passband were rescaled in the range of 0.015 dB and 0.1°respectively after calibration of equalizer.The method has been applied in practical engineering projects.