Electromagnetic vector sensor array amplitude and phase error self-correcting method based on array rotation

Abstract

The invention discloses an electromagnetic vector sensor array amplitude and phase error self-correcting method based on array rotation. The method includes: an electromagnetic vector sensor with amplitude and phase errors is used as a receiving array and installed on a rotation device to receive a transverse electromagnetic wave calibration source signal, two groups of sampling data of an array output signal are received before the array rotates and after the array rotates 90 degrees around a z axis in clockwise mode, a sampling signal autocorrelation matrix formed by the two groups of sampling data is calculated, characteristic decomposition is performed on the sampling signal autocorrelation matrix to obtain signal guiding vector estimation values before and after rotation of an array and estimate an amplitude and phase error matrix, and an array element to be corrected receives an inverse matrix of a data premultiplication amplitude and phase error matrix so as to achieve correction of amplitude and phase errors. The electromagnetic vector sensor array amplitude and phase error self-correcting method based on the array rotation can estimate amplitude errors and signal arrival angles of the signal of the electromagnetic vector sensor, has high parameter estimation accuracy, does not need iterative operation, and is small in calculated amount.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic vector sensor error correction, in particular to a self-correction method for the amplitude and phase error of an electromagnetic vector sensor array. Background technique [0002] Electromagnetic vector sensors can obtain the polarization information of electromagnetic signals. The development and utilization of electromagnetic wave polarization information can effectively improve the capabilities of radar systems in anti-jamming, target recognition, detection, and tracking. Compared with the scalar antenna sensor array, the electromagnetic vector sensor array has the following advantages: small geometric size, high resolution capability, wideband signal processing, no spatial undersampling problem, and no time synchronization problem. These superior properties make polarization-sensitive arrays have important application value and broad application prospects in military and civil affairs...

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Problems solved by technology

In terms of electromagnetic vector antenna error correction, K.T. Wong first proposed a mathematical model of the in-situ error, and estimated the in-situ error using three correction sources with known directions of arrival; then Huang Jiacai and Zhang Ruige further improved K.T. Wong’s in-situ error Error estimation algorithm; Zou Jingjing et al. studied the magnitude and phase errors among multiple electromagnetic vector sensors under the assumption that a single electromagnetic vector sensor is an ideal model; Liao Guisheng et al. Phase error, the amplitude and phase error correction method is to use the same correction source to transmit two signals with the same arrival direction and known signal to correct the error, but in practical applications, the arrival direction of the signal is often difficult to control accurately, and it can be realized poor sex

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