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Near-field strong interference source inhibition method in underwater far-field target passive positioning process

A passive positioning and interference source technology, applied in the suppression of near-field strong interference sources in the process of passive positioning of underwater far-field targets, in the field of underwater acoustic passive positioning, can solve problems such as lack of underwater far-field target positioning functions

Active Publication Date: 2012-12-05
HARBIN ENG UNIV
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Problems solved by technology

This method can only realize the acoustic image measurement of the radiated noise of underwater structures, but it does not have the function of locating underwater far-field targets.

Method used

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  • Near-field strong interference source inhibition method in underwater far-field target passive positioning process
  • Near-field strong interference source inhibition method in underwater far-field target passive positioning process
  • Near-field strong interference source inhibition method in underwater far-field target passive positioning process

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Embodiment Construction

[0041] The technical scheme adopted in the present invention is:

[0042] When performing far-field target detection, the method of beam nulling is used to suppress near-field strong interference, so as to reduce the influence of near-field interference sources on far-field target detection. Using this method needs to design the beam nulling weight suitable for the near field, which can maximize the beamforming output power in the target azimuth, and make the beam output at the interference position point be zero. The target azimuth is defined as the angle between the line connecting the center of the target and the receiving array and the extension line on the left side of the array, and the interference azimuth is the angle between the line connecting the center of the interference source and the receiving array and the extension line on the left side of the array. Assume that the target azimuth is θ, and the position coordinates of the interference source are (r 1 ,θ 1 ),...

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Abstract

The invention provides a near-field strong interference source inhibition method in an underwater far-field target passive positioning process. The method comprises the following steps of: before sonar equipment detects a far-field target, utilizing a near-field sound figure scanning method to extract the number N and position information of interference sources in a near-field area of the sonar equipment; building a model in which a near-field strong interference source exists when an underwater far-field target is detected, and calculating to obtain steering vectors of position coordinates on which i interference source is located; determining forms of a wave beam null width weight and an azimuth spectrum; judging whether a signal received by a receptive array belongs to a wideband signal or not; dividing the received wideband signal into a plurality of narrow-band signals on a frequency domain; and finally, synthesizing outputs of all frequency bands to obtain an estimation result of the wideband signal. According to the near-field strong interference source inhibition method in the underwater far-field target passive positioning process, local interference is regarded as a near field, a wave beam directive null point focused to a point is formed aiming at the position coordinates on which the near field is located, the concrete forms of the wave beam null width weight and the azimuth spectrum are provided, dead zone influence brought by the prior wave beam null width method is overcome, and meanwhile, a true target is regarded as a far field to be measured.

Description

technical field [0001] The invention relates to an underwater acoustic passive positioning method in the field of array signal processing. More precisely, it is a method for suppressing near-field strong interference sources in the process of passive positioning of underwater far-field targets. Background technique [0002] In the process of passive positioning of underwater far-field targets, the suppression of near-field strong interference sources has always been concerned. Especially in the process of multi-target detection, the near-field strong interference source brings great interference to the detection of far-field targets, which directly leads to the shortening of the working distance of sonar equipment and the reduction of target resolution. There are many sources of underwater near-field strong interference sources, and the typical ones are tugboat interference and self-noise interference of the ship. The characteristics of near-field strong interference sourc...

Claims

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Application Information

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IPC IPC(8): G01S7/537G01S15/06
Inventor 张亮梅继丹王逸林蔡平
Owner HARBIN ENG UNIV
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