一种宽带阵列幅相与互耦误差联合校正算法

doi:10.7527/S1000-6893.2015.0312

Abstract

Abstract:

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.

Key words: wideband digital array radar, amplitude-phase errors, mutual coupling errors, least-squares, calibration matrix

CLC Number:

LI Weixing, ZHANG Yue, CHEN Zengping, XU Shiyou. Wideband calibration algorithm for amplitude-phase and mutual coupling errors[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016, 37(3): 1025-1035.

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Wideband calibration algorithm for amplitude-phase and mutual coupling errors

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