A method and system for tracking underwater acoustic target azimuth based on azimuth history map
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, and achieve the effect of suppressing multi-target interference
Active Publication Date: 2022-01-25
INST OF ACOUSTICS CHINESE ACAD OF SCI
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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
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[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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The invention discloses a method and system for tracking the azimuth of an underwater acoustic target based on an azimuth history map. The method includes: step 1) establishing an azimuth history map of an underwater acoustic target; n‑1 The target azimuth of is the search center, and the current time T is established n matching template; step 3) based on T n‑1 The matching template of the time, within a certain azimuth search range, for the current time T n Two-dimensional matching search is performed on the azimuth history map, and the azimuth corresponding to the position with the highest matching degree is taken as T n The orientation of the time; step 4) increase n by 1, and turn to step 2), until the target disappears. The method of the invention can effectively suppress multi-target interference and realize stable and continuous tracking of weak target azimuths.
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...
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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