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Coherent signal source DOA estimation method based on predelay spatial-temporal structure

A coherent signal and space-time technology, which is applied to direction finders for direction determination, direction finders using radio waves, radio wave direction/deviation determination systems, etc., can solve coherent sources and frequency domain broadband direction finding calculations, etc. problem, to achieve the effect of increasing the resolution

Pending Publication Date: 2019-01-11
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

However, the current space-time structure broadband DOA cannot solve the coherence. The present invention discloses a method that can simultaneously solve the coherent source and frequency-domain broadband direction finding with a large amount of calculation.

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  • Coherent signal source DOA estimation method based on predelay spatial-temporal structure
  • Coherent signal source DOA estimation method based on predelay spatial-temporal structure
  • Coherent signal source DOA estimation method based on predelay spatial-temporal structure

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Embodiment Construction

[0071] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the embodiments and the accompanying drawings.

[0072] The invention processes wideband signals based on the space-time Frost processing structure, and then uses the iterative adaptive approach (IAA, Iterative Adaptive Approach) to select initial values ​​to iterate to achieve the purpose of decoherence.

[0073] The present invention uses the Frost space-time processing structure for the broadband signal processing part, such as figure 1 Shown. The core idea is to add Q delays or time-domain taps behind each element. These delay periods or taps form a finite-length unit impulse response (FIR) filter to form a set of frequency-dependent responses. It is used to compensate the phase difference formed by the change of frequency. When the signal received by the array element is a broadband si...

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Abstract

The invention discloses a coherent signal source DOA estimation method based on a predelay spatial-temporal structure and belongs to the technical field of adaptive array signal processing. The DOA estimation method disclosed by the invention can solve the problems that an existing wide-band coherent signal algorithm (CSM) only can be applied to a related conditions and calculation amount is too large and a current spatial-temporal structure broadband DOA can not solve coherence at the same time. After signal recombination is performed based on the predelay spatial-temporal structure, a constraint matrix and a constraint vector corresponding to a to-be-searched angle are obtained, and then iterative processing is adopted for processing and acquiring power spectrum of a search angle; and finally, obtaining a DOA estimation result of a signal source by virtue of a peak position of the power spectrum of the search angle. The method disclosed by the invention has the advantages that resolution is improved to some extent under the conditions of relatively small signal data size and low signal-to-noise ratio.

Description

Technical field [0001] The present invention relates to the technical field of adaptive array signal processing, in particular to a coherent signal source DOA (Direction Of Arrival) estimation method based on a pre-delay space-time structure. Background technique [0002] The existing DOA estimation algorithms for related wideband signals are mainly related signal subspace algorithm (CSM, CoherentSignal-Subspace Method). The basic idea is to decompose the wideband array data into several narrowband data through Fourier transform, and then use the focus matrix to The covariance matrices at different frequencies are focused on a certain reference frequency, and then the narrowband estimation method is used to estimate the DOA. For details, please refer to the literature "Focusing matrices for coherentsignal-subspaceprocessing; H. Hung, M. Kaveh; IEEE Trans. SP, June 1988 ,36(8),1272-1281". This method is based on the space-frequency structure, and the algorithm based on the space-...

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Application Information

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IPC IPC(8): G01S3/14
CPCG01S3/143Y02D30/70
Inventor 谢菊兰陈敲月胥凌锐胡君丽谢明李会勇
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA