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A Passive Ranging Method of Three-element Vector Array

A technology of passive ranging and vector array, which is applied in the direction of measuring devices, radio wave measuring systems, instruments, etc., can solve the problems of affecting the accuracy of ranging and the accuracy of time delay measurement, so as to improve the accuracy, improve the accuracy of time delay estimation, The effect of less computation

Active Publication Date: 2019-10-22
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

The traditional three-element array only uses the sound pressure information of the sound field, resulting in low delay measurement accuracy, which affects the distance measurement accuracy

Method used

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Embodiment Construction

[0058] The method of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0059] Such as figure 1 Shown, a kind of ternary vector array passive ranging method, described method comprises:

[0060] Step 101) Time-domain filtering is performed on the output of the three array element channels through a pre-designed FIR filter, and only the signal processing frequency band is filtered to eliminate the influence of invalid frequency bands on the signal processing frequency band spectrum leakage and subsequent signal processing; The array elements are three vector hydrophones: H1, H2 and H3;

[0061] Step 102) Preliminary estimation of target orientation;

[0062] Such as figure 2 As shown, the H1 and H3 sound pressure channels are time-domain filtered and output p 1 (n),p 3 (n) Estimate the time delay, take the H1 array element as the reference, calculate the time delay difference between H3...

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Abstract

The invention discloses a ternary vector array passive distance measuring method. The method comprises the steps that time domain filtering is carried out on signals output by three vector hydrophonesH1, H2 and H3; two vector hydrophones are selected; according to the sound pressure channel time domain filtering output outputted by two array elements, time delay estimation is calculated to estimate the target azimuth theta P; vector array synthesis is completed according to the target azimuth theta P; each vector combination is output to calculate the cross-correlation output of H1 and H2 andH1 and H3; the cross-correlation output is filtered; frequency bands are divided, and the filtered cross-correlation output of each frequency band is fused; and the time delay estimation is calculated based on the fusion result to complete the azimuth and distance estimation of a target. According to the invention, the method can fully use the sound field information; the time delay estimation accuracy is improved; the passive distance measuring accuracy is ultimately improved; and the method has a small amount of calculation and is highly practical.

Description

technical field [0001] The invention belongs to the field of underwater acoustic signal processing, and in particular relates to a ternary vector array passive ranging method, which can improve the precision of the passive ranging. Background technique [0002] There are three main types of passive ranging sonar developed at present: three-element array ranging, target motion analysis (TMA) and matching field processing (MFP). [0003] Target motion analysis (TMA) is a relatively mature long-distance ranging method in technology at present. The commonly used method is azimuth-only TMA, which requires high azimuth measurement accuracy and an accurately known own ship track. In practice, it is not necessarily convenient to obtain the maneuvering behavior of the own ship, because it may expose itself, and sometimes it is not allowed, which is contradictory to the purpose of passive positioning. The way to solve this contradiction is to add new observations, such as frequency, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S15/08
Inventor 鲍习中陈新华郑海波李媛
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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