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Target detection method and system capable of being used for passive synthetic aperture array yawing

A target detection and synthetic aperture technology, which is applied in directional multi-channel systems, radio wave measurement systems, and direction finders using ultrasonic/sonic/infrasonic waves, etc., to improve the accuracy of azimuth estimation, excellent detection capabilities, and better detection effects Effect

Inactive Publication Date: 2014-03-26
INST OF ACOUSTICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The object of the present invention is to overcome the problems and defects that the passive synthetic aperture sonar algorithm in the prior art is generally used for the detection and resolution of target signals under ideal conditions. Airborne target detection method and system

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  • Target detection method and system capable of being used for passive synthetic aperture array yawing
  • Target detection method and system capable of being used for passive synthetic aperture array yawing
  • Target detection method and system capable of being used for passive synthetic aperture array yawing

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Embodiment

[0082] Such as figure 1 as shown in figure 1 As shown, consider N isotropic linear arrays with equidistant distance d, the basic array is moving in a straight line at a uniform speed, and the speed is v, taking the ship radiation noise signal received by the first array element at t=0 as the reference standard, the first The propagation delay of two array elements relative to the first array element is Δτ, then the signal received by the nth array element is

[0083] x n (t i )=Aexp[j2πf(t i -τ n )]+ξ n (t i )

[0084] In the formula, A-amplitude; f-frequency; t i - i-th sampling time, τ n is the propagation delay of the nth hydrophone element relative to the first element (n-1) Δτ, which can be further written as, R 1 , R n are the distances between the radiating sound source and the No. 1 and No. n receiving hydrophones

[0085] τ n =(R n -R 1 ) / c

[0086] ξ n (t i ) represents independent zero-mean marine ambient noise.

[0087] After moving at speed v fo...

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Abstract

The invention relates to a target detection method and system capable of being used for passive synthetic aperture array yawing. The method comprises the following steps: step101), establishing a receiving model, receiving target signals and sampling when a towed line array moves; step 102), based on the receiving model, calculating phase correlation factors of each overlapped array element of the two adjacent snapshots when the towed line array moves twice in succession during the adjacent sampling time intervals, and obtaining the phase correlation factors of unoverlapped array element through phase estimation and correction by adopting linear fitting; step 103), taking the first-time snapshot during the towed line array sonar sampling as a criteria, utilizing the correlation factors of the unoverlapped array elements obtained through fitting to perform phase correction and compensation on the snapshot output of each array element of the second-time measuring; step 104), repeating the two steps until outputs of all snapshot arrays of receiving signals of each measuring are compensated sequentially, and obtaining output results of an expanded virtual array; step 105), coherently summing up the outputs of the expanded virtual array, so as to realize the detection for the target signals.

Description

technical field [0001] The invention relates to an underwater acoustic passive sonar signal detection method and a passive synthetic aperture sonar (Passive Synthetic Aperture Sonar, PSAS) technology used in a target signal detection algorithm, in particular to a target that can be used for passive synthetic aperture array yaw Detection method and system. Background technique [0002] The actual needs of ocean development and utilization have become the main driving force for the development of sonar technology. In recent years, passive sonar systems have become more and more important and difficult to detect low-noise targets. The emergence and rapid development have been seriously challenged. With the continuous improvement of the requirements for naval warfare under the modern high technology, the research of towed line array sonar based on passive synthetic aperture technology has become a hot research issue in the field of underwater acoustic signal processing. Towed ...

Claims

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Application Information

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IPC IPC(8): G01S15/04G01S7/52
CPCG01S15/8904G01S5/20G01S3/8006G01S3/8083
Inventor 赵闪陈新华余华兵
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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