The Calibration Method of Channel Consistency of Distributed Digital Phased Array

In this paper, a new valid calibration method is put forward to satisfy the request of channel consistency of distributed digital phased array. Firstly, the time delay estimation algorithm based on temporal coherence is used to align the large time delay among channels. Then, the frequency domain equalization algorithm based on the least squares fitting is used to achieve consistency of magnitude and phase among channels. The effectiveness of above method is validated through analyzing of equalization result on MATLAB platform. The results shows that the magnitude and phase differences between reference channel and mismatch channel in the pass band are rescaled in the range of 0.015 dB and 0.1° respectively after the calibration of equalizer. Furthermore, this method has been applied in practical engineering project.