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Underwater sound target azimuth tracking method and system based on azimuth history plot

A technology of target azimuth and azimuth history, applied in the field of underwater acoustic target azimuth tracking methods and systems, can solve problems such as tracking deviation, achieve stable and continuous tracking, and suppress multi-target interference

Active Publication Date: 2020-02-07
INST OF ACOUSTICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is reflected in that when other interfering targets appear near the azimuth of the target of interest, cross tracks will appear on the azimuth history map, causing tracking deviation
Especially when the noise intensity of the target of interest is weaker than that of the interfering target, the traditional tracking method will inevitably lead to tracking deviation

Method used

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  • Underwater sound target azimuth tracking method and system based on azimuth history plot
  • Underwater sound target azimuth tracking method and system based on azimuth history plot
  • Underwater sound target azimuth tracking method and system based on azimuth history plot

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Embodiment Construction

[0063] The method of the present invention will be described in detail below.

[0064] The present invention proposes an underwater acoustic target azimuth tracking method based on the azimuth history map, which specifically includes:

[0065] Step 1) Establish the azimuth course map of the underwater acoustic target, specifically including:

[0066] 1. According to a certain time interval, intercept the signal received by the sonar array with a fixed length;

[0067] 2. Based on a certain array element of the sonar array, according to a certain azimuth interval, calculate the time difference of the target noise received by each array element under the corresponding azimuth;

[0068] 3. According to the time difference of the target noise received by each array element, perform time compensation for the received signal of each array element (translate the time axis of the signal delay, so that the initial phase of the received target noise of each array element is consistent)...

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Abstract

The invention discloses an underwater sound target azimuth tracking method and system based on an azimuth history plot. The method comprises the following steps: 1) setting up an underwater target azimuth history plot; 2) by taking a target azimuth angle at a previous moment Tn-1 as a search center, creating a matching template at the current moment Tn; 3) based on a matching temperature at the moment Tn-1, performing two-dimensional matching search on an azimuth history plot at the current moment Tn in a certain azimuth angle search range, and taking an azimuth corresponding to a position with the highest matching degree as an azimuth at the moment Tn; and 4) enabling n to be added with 1, and shifting to the step 2) until a target disappears. The method disclosed by the invention can effectively inhibit multi-target interference and realizes stable and continuous tracking on a weak target azimuth.

Description

technical field [0001] The present invention relates to the technical field of passive sonar signals and information processing, and more particularly relates to an underwater acoustic target azimuth tracking method and system based on an azimuth history map. Background technique [0002] The radiated noise of underwater acoustic targets, such as engine noise, underwater acoustic detection pulses, underwater acoustic communication pulses, etc., can be used by passive detection sonar arrays for target directional tracking. [0003] Discovering and automatically tracking targets with the help of underwater acoustic target azimuth history maps is a commonly used method for underwater acoustic target discovery and azimuth tracking. If there is an underwater acoustic source in the current azimuth direction, the amplitudes of the time-compensated array element signals will be superimposed in the same direction during the fusion process, otherwise they will be completely or partial...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S15/66G01S7/539G01S7/537
CPCG01S15/66G01S7/539G01S7/537G01S15/006
Inventor 李超林一超王海斌
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI