Underwater moving target closest approach distance estimation method based on single-vector hydrophone

An underwater moving target and distance estimation technology, applied in the field of marine acoustics, can solve the problem of single-vector hydrophone estimation of underwater moving targets, etc., and achieve the effect of rigorous process and accurate results.

Active Publication Date: 2020-08-25
OCEANOGRAPHIC INSTR RES INST SHANDONG ACAD OF SCI
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Problems solved by technology

In the prior art, there is no relevant report on the use of single-vector hydr

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  • Underwater moving target closest approach distance estimation method based on single-vector hydrophone
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  • Underwater moving target closest approach distance estimation method based on single-vector hydrophone

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[0039] In order to facilitate the understanding of the present invention, the present invention will be described in more detail below in conjunction with the accompanying drawings and specific embodiments. Preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0040] One of the embodiments provided by the present invention is: a method for estimating the closest approach distance of an underwater moving target based on a single-vector hydrophone, the process of the method is as follows figure 1 As shown, the specific steps are:

[0041] 1. Estimate the heading angle by using the target azimuth angle

[0042] Assuming that the underwater target moves in a str...

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Abstract

The invention belongs to the technical field of marine acoustics, and relates to an underwater moving target closest approach distance estimation method. The method comprises the following steps: estimating azimuth angles of a target at three equal-interval moments by utilizing sound field information received by a single-vector hydrophone, and obtaining an estimated value of a target course angleaccording to the estimated azimuth angles; estimating the radial velocity of the target by using a synthetic aperture beam forming method according to the horizontal wave number spectrum characteristics; and according to the estimated values of the target azimuth angle, the heading angle and the radial speed, calculating the target closest approach distance by utilizing a geometric equation. According to the method, the problem that the distance of the underwater moving target cannot be estimated through a single-vector hydrophone in the prior art is solved. When the course angle is estimated, equal-time-interval azimuth sampling and geometric calculation are adopted, and the process is rigorous. Horizontal wave number spectrum characteristics are adopted, a synthetic aperture beam forming method is used for estimating the radial speed of a target, and a strict theoretical basis is provided. The closest approach distance is calculated according to the geometrical relationship, and theobtained result is accurate.

Description

technical field [0001] The invention belongs to the technical field of marine acoustics and relates to a method for estimating the closest approach distance of an underwater moving target. Background technique [0002] Passive positioning or ranging of underwater targets has long been a hot and difficult point in underwater acoustic science research. Up to now, there are mainly the following underwater acoustic positioning technologies: three-subarray method, matching field method, matching mode method, waveguide invariant method, time reversal mirror method and target motion analysis method, etc. [0003] (1) Three-subarray method: The core of this method is to estimate the horizontal distance of the sound source by using the geometric relationship, that is, to divide a horizontal receiving line array into three sub-arrays, and use the time difference between the arrival of the sound source signal to different elements of the sub-array to estimate the horizontal distance of...

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Application Information

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IPC IPC(8): G01S11/14G01S3/802
CPCG01S11/14G01S3/802
Inventor 郑轶何传林杜金燕刘洪宁许岩翟林
Owner OCEANOGRAPHIC INSTR RES INST SHANDONG ACAD OF SCI
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