Fast Active Calibration for Uniform Linear Array with Amplitude and Phase Errors

This paper presents a new active calibration algorithm to calibrate uniform linear array with amplitude and phase errors by placing an auxiliary signal known with energy and azimuth in the far-field. This algorithm only needs some easy disposal of the signal covariance matrix to estimate the amplitude-phase errors without matrix eigendecomposition as the traditional active-calibration algorithm does. It's greatly reduces the computation. When the array is calibrated, the paper apply one-dimension noise subspace algorithm to estimate the signal DOA. This algorithm can be applied to electronic countermeasure. Simulation results show that the algorithm can effectively estimate the array amplitude-phase errors, and it is robust. Keywords—electronic countermeasure, array signal processing, active calibration, uniform linear array, amplitude and phase errors, DOA estimation