Narrowband interference suppression method and narrowband interference suppression system used for passive synthetic aperture

A narrow-band interference and synthetic aperture technology, applied in the field of sonar, can solve problems such as difficult to effectively remove interference, real-time signal processing, and unrealizable stability, so as to achieve better detection results, reduce the probability of misjudgment, and excellent detection capabilities Effect

Inactive Publication Date: 2014-10-15
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

[0007] The purpose of the present invention is to overcome the narrow-band interference suppression technology in the prior art, for the frequent occurrence of interference signals, it is dif...

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  • Narrowband interference suppression method and narrowband interference suppression system used for passive synthetic aperture
  • Narrowband interference suppression method and narrowband interference suppression system used for passive synthetic aperture
  • Narrowband interference suppression method and narrowband interference suppression system used for passive synthetic aperture

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Embodiment Construction

[0039] The present invention will be further described now in conjunction with accompanying drawing.

[0040] Before describing the method of the present invention in detail, some concepts involved in the present invention are firstly described uniformly for ease of understanding.

[0041] Time orientation history graph: The time orientation history graph is formed by performing short-time Fourier transform on continuous sampling data. The sampling sequence of the original signal is divided into frames (for example, divided into 100 frames, 2000 points in each frame), and the frames overlap each other by 50%, and then the beamforming processing is performed on each frame signal to obtain the corresponding target position of each frame. The temporal union of each frame yields a time orientation history map. The azimuth of the target can be read out by using a time azimuth history map, and the azimuth record is subjected to subsequent fitting processing and threshold discrimina...

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Abstract

The present invention relates to a narrowband interference suppression method used for a passive synthetic aperture. The method comprises the steps of carrying out fast Fourier transform (FFT) on a signal received by an array element when a towed line array sonar is sampled at one moment, and estimating a center frequency and an interference band of narrowband interference; filtering the signal and reconstructing the filtered signal in a time domain; presetting the total number of frequency compensation; carrying out FFT and frequency-domain beam forming on the signal, and accumulating the frequency-domain beam forming result; after movement for certain time, carrying out FFT and frequency-domain beam forming on a sampling signal, and accumulating the frequency-domain beam forming result; calculating the total phase correction compensation to obtain an output result of an extended virtual array; carrying out coherent accumulation on the output result of the compensated extended virtual array to obtain a time azimuth history plot to detect a detected target signal, determining whether the current number of times of frequency compensation is the preset total number of frequency compensation, if no, changing a current frequency value, and re-executing until the current number of times of frequency compensation is the preset total number of frequency compensation.

Description

technical field [0001] The invention relates to the field of sonar, in particular to a narrow-band interference suppression method and system for passive synthetic aperture. Background technique [0002] With the development of low-noise ships and acoustic stealth technology, the underwater radiation noise and target intensity of ships and other aircraft have further decreased. The emergence and rapid development of the target have been seriously challenged. [0003] With the development of science and technology, the research of dragged line array sonar based on passive synthetic aperture technology has become a research hotspot in the field of underwater acoustic signal processing. The towed line array sonar is widely used in the measurement of underwater target characteristics because it can stay away from the self-noise of the ship, is not limited by the aperture, and can be towed in depth to make use of hydrological conditions. The method provides an effective way to ...

Claims

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Application Information

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IPC IPC(8): G01S7/537
CPCG01S11/14G01S3/86G01S5/18
Inventor 赵闪陈新华孙长瑜
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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