A Method of Target Azimuth and Direction Finding Based on Regularized Least Squares Subspace Intersection

A subspace intersection and least squares technology, applied in direction determination direction, measurement device, radio wave measurement system, etc., to achieve high azimuth resolution and accuracy, and stable numerical calculation.
CN103513238BInactive Publication Date: 2015-11-18INST OF ACOUSTICS CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
INST OF ACOUSTICS CHINESE ACAD OF SCI
Publication Date
2015-11-18
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention relates to a regularization least square subspace crossing target direction finding method. According to the method, the Tikhonov regularization method and the least square subspace crossing algorithm are combined to process received signals of a shallow-sea sonar apparatus. On a basis of constructing a least square problem through the utilization of the subspace crossing principle, and then through the regularization method, optimal regularization factors are determined, so that detection and accurate positioning of shallow-sea targets are finally realized. According to the regularization least square subspace crossing target direction finding method of the invention, the Tikhonov regularization method and the least square subspace crossing algorithm are combined for form a new direction finding algorithm. Compared with routine wave beam formation algorithms, the method is better in direction resolution performance and higher in accuracy degree, and the value calculating is stable.
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Description

technical field

[0001] The invention belongs to the field of sonar digital signal processing, in particular to a regularized least square subspace intersection direction finding method suitable for shallow sea environments. Background technique

[0002] In the shallow sea environment, the sound propagation is significantly affected by the ocean waveguide interface, especially the sea bottom. In this case, the traditional target orientation estimation algorithm based on the plane wave model is no longer applicable, and the normal wave model can be more accurately Describe the sound field. According to the normal wave theory, the sound source will excite several normal waves in the ocean waveguide. The signals received by each element of the array are the result of the superposition of the normal waves. The phase velocities of the normal waves are different, especially For low-frequency signals, the difference in phase velocity is particularly obvious. This difference is refle...

Claims

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