Amplitude phase error self-correcting method applicable to uniform circular array acoustic susceptance system

Abstract

The invention discloses an amplitude phase error self-correcting method applicable to a uniform circular array acoustic susceptance system and belongs to the technical field of signal processing in the acoustic susceptance system. Firstly, a uniform circular array is converted into a virtual line array through a mode-space conversion theory; then, direction-of-arrival estimation is carried out on the uniform circular array converted into the virtual line array through a TSI algorithm, and an azimuth angle of a correction source is determined; then the amplitude phase error parameter of the uniform circular array is estimated through a spatial filter. The azimuth angle of the correction source is estimated by the adoption of the TSI algorithm under the condition that the position of the correction source is unknown, higher azimuth angle estimation precision is achieved, and then higher amplitude phase error estimation precision is achieved.

Description

technical field [0001] The invention discloses an amplitude and phase error correction method, in particular a self-correction method for amplitude and phase errors suitable for a uniform one-dimensional circular array (UCA, Uniform Circular Array) sonar system, and belongs to the technical field of signal processing in sonar technology. Background technique [0002] In the fields of sonar and wireless communication, due to the reasons of production technology and construction technology, it is often difficult to avoid receiving array errors, which will directly affect the detection performance of the system. Array error correction has always been one of the key technologies for the application of array signal processing algorithms in engineering practice. Most array errors can be attributed to amplitude and phase errors. At present, the correction methods of array errors can be divided into two types: active correction and self-correction. The active correction method need...

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Problems solved by technology

The active correction method needs to know the accurate position information of the correction source relative to the center of the circular array in advance, so it is difficult to apply in engineering practice

The common self-calibration method is generally used for linear arrays. It does not need to place a correction source with known position information in advance. It usually requires an iterative optimization operation on the established cost function. As the number of array elements increases, the amount of calculation will be huge.

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