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Underwater motion array multi-target detection and position estimation integrated method

An azimuth estimation and multi-target technology, applied in the direction of measuring devices, radio wave measurement systems, sound wave reradiation, etc., can solve the problems of inability to give azimuth estimation at the same time, poor performance, etc.

Inactive Publication Date: 2015-02-04
HENAN UNIV OF SCI & TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide an integrated method for underwater motion array multi-target detection and azimuth estimation to solve the problem of poor performance of traditional detection methods under low signal-to-noise ratio and inability to give azimuth estimation at the same time

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  • Underwater motion array multi-target detection and position estimation integrated method
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  • Underwater motion array multi-target detection and position estimation integrated method

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Embodiment Construction

[0033] 1. Motion array signal model

[0034] Consider M array elements, a uniform linear array with a spacing of d, and the array moves in a straight line at a speed v along the x-axis of the reference coordinate. The K frequencies located in the far field of the receiving array are f 0 The narrowband signal source s k (t) respectively by θ k The incident angle reaches each element of the receiving array. During the entire measurement time T, the sampling frequency is f s , the sampling time interval is Δt and t i =i*△t(i=1,2,...,N, N is the total number of sampling points). At this time at t i The received data of the nth (n=1,2,...,M) array element at any time can be expressed as

[0035] x n ( t i ) = Σ k = 1 K A k ...

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Abstract

The invention relates to an underwater motion array multi-target detection and position estimation integrated method which is characterized by according to a motion array signal model, obtaining a twice-continuous-measurement reception data formula and obtaining phase correction factors; carrying out matrix-form block partitioning on the motion array signal model; by utilizing the synthetic aperture technique and utilizing the phase correction factors, extending a physical array into a virtual array and reconstituting the block matrixes into data matrixes to form MVDR spatial spectrum, and obtaining a detection threshold value through on-site noise study; and obtaining spectrum peak number above the detection threshold value which is regarded as the target number, and the angle corresponding to the spectrum peak is the azimuth angle of an incidence target. The method fully utilizes the underwater motion array synthetic aperture technique to improve array gain and angular resolution, and utilizes an MVDR spatial spectrum function for reflecting signal energy to determine the number of the targets and method; and compared with coherent signals, the detection performance of the method under low signal to noise ratio is obviously superior to that of the conventional method, detection threshold is reduced, farther detection distance is achieved, and position estimation value can be given.

Description

technical field [0001] The invention belongs to the technical field of underwater array signal processing, and relates to an integrated method for underwater motion array multi-target detection and orientation estimation. Background technique [0002] Long-range detection and position estimation of underwater multi-targets are two key issues in underwater array signal processing. The traditional method is to deal with these two aspects separately, first to detect the number of targets through a certain detection method, and then use a certain orientation estimation method to determine the orientation of each target. In this way, the quality of the previous target detection results directly affects the performance of the subsequent target orientation estimation. [0003] In the field of array signal processing, determining the number of signal sources from limited observation data is a prerequisite for many high-resolution azimuth estimation methods. The classic methods for...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/539
CPCG01S7/536G01S7/539G01S15/003
Inventor 侯云山翟红村陈建华徐向艺李佩佩汤艳红翟普杰
Owner HENAN UNIV OF SCI & TECH
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