Amplitude and phase error correction method used for linear array of underwater acoustic transducer

Abstract

The invention discloses an amplitude and phase error correction method used for a linear array of an underwater acoustic transducer, and the method utilizes the feature that the relative value of rotation angle of a rotation mechanism of a water tank is easy to be precisely controlled, leads the array to be tested to gradually receive a plurality of test signals with different incident angles, andadopts a certain method for estimating a curve of incident directions of various test signals and amplitude and phase errors of each basic element in the array which are changed along with the incident angles, thereby being used for array amplitude and phase error correction. The method comprises the following steps: (1) obtaining the curve of the array amplitude and phase errors which are changed along with the incident angles by measurement and calculation; and (2) utilizing the curve of the array amplitude and phase errors which are changed along with the incident angles for carrying out correction on direction-of-arrival estimation (hereinafter referred to as DOA). The method has the advantages that the array correction method does not need to carry out micro-disturbance hypothesis onthe amplitude and phase errors of the array of the transducer, takes into consideration of inconsistency of the amplitude and phase errors of various array elements at the different incident angles,has a certain universal applicability and is particularly applicable to the correction of the high-frequency underwater acoustic transducer.

Description

technical field [0001] The invention relates to an array correction technology, in particular to an amplitude and phase error correction method for a line array of an underwater acoustic transducer. Background technique [0002] The existing array calibration methods can be divided into active calibration methods, self-correction methods, and auxiliary array element methods. The active correction method estimates the array disturbance parameters off-line by setting an auxiliary signal source whose orientation is precisely known in space. The disadvantage of the active correction method is that a signal source whose position is precisely known is required. The self-calibration method does not require a source whose position is known precisely, and can complete the estimation of DOA online, but the self-correction method generally uses an iterative algorithm to jointly estimate the source direction and error parameters, which not only has a large amount of computation, but als...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome that the existing traditional array calibration methods cannot be applied to the calibration of underwater acoustic transducer linear arrays with the characteristics of anisotropy, small array element spacing, large phase error and large phase error, thereby providing A method for correcting amplitude and phase errors of a linear array of underwater acoustic transducers. This method first obtains the curves of array amplitude and phase errors as a function of incident angle, and then uses these curves to correct the DOA estimation

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