Self-calibration method for mutual coupling error of mimo radar transceiver array

Abstract

The invention provides a self-correcting method for mutual coupling errors of MIMO radar receiving and transmitting arrays, and mainly solves the problems that when mutual coupling errors of the receiving and transmitting arrays are corrected by the traditional method, a large number of samples are required, and transmitting mutual coupling errors cannot be corrected in real time in an online manner. According to the technical scheme, the self-correcting method comprises the following steps: 1, carrying out pulse compression on MIMO radar echo data to obtain a data matrix Y; 2, constructing a pseudo-covariance R by using a spatial smoothing algorithm; 3, estimating strong clutter azimuth information according to the pseudo-covariance R; 4, constructing a cost function by using the data matrix Y and the strong clutter azimuth information, and calculating a receiving mutual coupling error matrix Cr through the cost function to estimate receiving mutual coupling errors; and 5, solving a transmitting mutual coupling error matrix Ct by using the receiving mutual coupling matrix Cr to estimate the transmitting mutual coupling errors. Single snapshot echo data of an MIMO radar are used, mutual coupling errors of the receiving and transmitting arrays can be accurately estimated respectively, therefore, self-correcting of the receiving and transmitting mutual coupling arrays is realized, and the self-correcting method can be used for improving the detecting performance of the MIMO radar.

Description

technical field [0001] The invention belongs to the field of radar technology, in particular to a method for correcting mutual coupling errors of radar transceiver arrays, which can be used for MIMO radar detection. Background technique [0002] Multiple-input multiple-output MIMO radar, as a new system radar, can transmit different signals through multiple transmitting antennas, and multiple receiving antennas can simultaneously receive echoes and perform signal processing. Theoretical research shows that the performance of MIMO radar in terms of degrees of freedom, anti-clutter, multi-target detection and tracking, and angular resolution is significantly improved compared with traditional radar. However, the acquisition of the above excellent performance is based on the premise of an accurately known array manifold. In actual engineering applications, due to the existence of mutual coupling errors, the actual array manifold will have certain deviations. Array manifold mis...

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Problems solved by technology

[0004] The purpose of the present invention is to address the shortcomings of the above-mentioned prior art, and propose a method for correcting the mutual coupling error of transmission and reception based on single-shot MIMO radar echo data, so as to solve the problem that the traditional method cannot correct the mutual coupling error of the transmitting end in real time online and the demand for samples big problem

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