Delay inequality estimation method based on phase compensation

A technology of phase compensation and delay difference, which is applied in the field of sonar signal processing, can solve the problems of poor tolerance, low precision of delay difference estimation, phase ambiguity, etc., and achieve the effect of enhancing tolerance, high precision and improving positioning accuracy

Inactive Publication Date: 2014-12-24
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The purpose of the present invention is that the time delay difference estimation method in the prior art has defects such as phase ambiguity, relatively poor tolerance, and low precision of tim

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  • Delay inequality estimation method based on phase compensation
  • Delay inequality estimation method based on phase compensation

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[0035] The present invention will be further described now in conjunction with accompanying drawing.

[0036] Before describing the method of the present invention in detail, the receiving array to which the method of the present invention is applicable is described first.

[0037] figure 1 It is a schematic diagram of a ternary array. The ternary array includes three array elements, which are respectively represented by numbers 1, 2, and 3. The target radiates signals from the θ direction, and the radiated signals reach each array after propagating through the underwater acoustic channel. Yuan. For the convenience of description, the method of the present invention is described below by taking array elements 1 and 2 as examples, and the method of the present invention is also applicable to other array elements.

[0038] Based on such figure 1 For the receiving array shown, the present invention firstly performs phase compensation on the cross-power spectrum signal between ...

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Abstract

The invention relates to a delay inequality estimation method based on phase compensation. The method is used for estimating the delay inequality of different receiving array elements for receiving target radiation signals in an underwater sound ternary array passive positioning system. The method includes the steps that phase compensation is performed on the cross-power spectrum signals between the receiving array elements; energy obtaining and peak search are performed on the cross-power spectrum signals subjected to phase compensation, and a delay inequality period value is obtained; the delay inequality correction value of the cross-power spectrum signals subjected to phase compensation is obtained on the phase compensation peak point through a least square method; the delay inequality period value and the delay inequality correction value are added together, and a final delay inequality estimation value is obtained.

Description

technical field [0001] The invention relates to the field of sonar signal processing, in particular to a time delay difference estimation method based on phase compensation. Background technique [0002] Using the radiated noise of underwater targets to detect and locate targets is an important means for submarines to detect and attack stealthily. At present, there are mainly three passive positioning methods: ternary array, target motion analysis, and matching field processing. Among them, the ternary passive positioning method is still a passive positioning method commonly used in submarine sonar equipment. The reason is that the estimation accuracy of the time delay difference directly determines the positioning accuracy of the target. [0003] Since the noise radiated by the underwater target is mostly a broadband signal, the cross-correlation function of the signal usually has a sharp correlation peak main lobe, and the receiving end can calculate the time delay betwee...

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Application Information

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IPC IPC(8): G01S7/539G01S15/06
CPCG01S7/52001G01S7/539G01S15/06
Inventor 郑恩明孙长瑜陈新华
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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