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Estimated angle error robust high-resolution broadband wave arrival direction estimation method

A direction estimation and high-resolution technology, applied in the field of signal processing, can solve the problems of loss of information, the performance accuracy of the coherent signal subspace algorithm is greatly affected, and the inability to deal with coherent sources, etc., to achieve the effect of improving robustness.

Active Publication Date: 2018-05-29
XIDIAN UNIV
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Problems solved by technology

The main idea of ​​the ISM algorithm is to divide the entire broadband signal into multiple narrowbands for separate processing. This processing method will lead to loss of information and cannot deal with coherent sources; while the coherent signal subspace algorithm, although each subband is focused to The processing method of a frequency point can effectively deal with the coherent source problem, but the general focusing method needs to estimate an incoming wave direction, and the performance of the coherent signal subspace algorithm is greatly affected by the accuracy of the estimated angle

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  • Estimated angle error robust high-resolution broadband wave arrival direction estimation method
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  • Estimated angle error robust high-resolution broadband wave arrival direction estimation method

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Embodiment Construction

[0022] refer to figure 1 , the realization process of the present invention is as follows:

[0023] Step 1: Receive data according to the uniform linear array, use the incoherent subspace algorithm (ISM) to obtain the estimated number of targets, roughly estimate the angle results, and determine the precise search range of each angle based on experience.

[0024] (1.1) Determine the uniform linear array, the uniform linear array includes M array elements, and the array element spacing is d; number the M array elements from 1 to M in sequence, and use the first array element as a reference array element , the uniform linear array receives broadband signals from P broadband sources within its detection range, and the incident angles of P broadband sources are set to be θ 1 ,θ 2 ,…,θ P , where the broadband source refers to the source whose bandwidth B of the signal received by each array element satisfies 1 / B≥0.1×(d / c); where, M>P, c is the speed of light.

[0025] Denote th...

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Abstract

The invention discloses an estimated angle error robust high-resolution broadband wave arrival direction estimation method. The method includes determining a uniform linear array which receives broadband signals from P broadband signal sources in the detection range of the uniform linear array, and respectively determining a rough estimation wave arrival angle of the P broadband signal sources andan accurate searching range of the P broadband signal source wave arrival angles; calculating the reference frequency-domain sub-band f0 after the tpth searching and the tpth searching angle value ofthe pth bandwidth signal source of the reference frequency-domain sub-band f0 after the tpth searching; taking the value of tp from 1 to T' to obtain the T'th searching angle value of the pth bandwidth signal source, and initiating the value of the tp to be 1; taking the value of p from 1 to P to obtain the T'Pth searching angle value of the P bandwidth signal source; calculating the T'Pth searching angle value function; further obtaining the wave arrival direction estimation angle of the Pth bandwidth signal source, wherein the wave arrival direction estimation angle of the Pth bandwidth signal source is the estimated angle error robust high-resolution broadband wave arrival direction estimation result.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to a high-resolution broadband direction-of-arrival estimation method that is robust to estimated angle errors, and is suitable for realizing accurate broadband wave direction-of-arrival in the case of obtaining an initial angle estimation of a broadband source with errors. Estimated direction of arrival. Background technique [0002] With the development of signal processing technology, the high-resolution algorithm based on narrowband array signal has been relatively mature; compared with narrowband signal, wideband signal has the characteristics of carrying a large amount of target information and weak correlation with reverberation background, which is conducive to the parameter estimation of the target ; Although the narrowband signal is similar to the wideband signal, its processing method cannot be directly applied to the processing of the wideband signa...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S3/14
CPCG01S3/143
Inventor 曾操周玮玮朱圣棋杨志伟李世东廖桂生陶海红李军许京伟申一伟
Owner XIDIAN UNIV
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