Coherent signal direction finding method and system with unknown signal source number

A coherent signal and source number technology, applied in the field of signal processing, can solve the problem of inaccurate noise covariance matrix

Inactive Publication Date: 2015-01-21
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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Problems solved by technology

But in reality, the noise covariance matrix calculated by limited observations is not accurate

Method used

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  • Coherent signal direction finding method and system with unknown signal source number
  • Coherent signal direction finding method and system with unknown signal source number
  • Coherent signal direction finding method and system with unknown signal source number

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Embodiment Construction

[0083] The invention discloses a coherent signal direction finding method with unknown number of sources, which comprises the following steps:

[0084] Consider a uniform linear array (ULA) with (2M+1) elements. Suppose there are P(P≤M+1) far-field narrowband signals from different directions {θ 1 ,…,θ P} incident on the array, the first K signals are mutually coherent, and the remaining (P-K) signals are mutually uncorrelated and independent of the first K signals. Let the first signal d 1 (t) as a reference signal, then the kth coherent signal can be expressed as

[0085] s k ( t ) = β k e jδ φ k s 1 ( t ) , k = 2 , ...

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Abstract

The invention provides a coherent signal direction finding method and system with an unknown signal source number. The coherent signal direction finding method includes the initiating step, the fourth-order cumulant matrix calculating step, the Toeplitz matrix establishing step, the intermediate variable setting step, the power spectrum calculating step and the searching step. The method and system have the advantages that decorrelation is conducted on coherent signals by establishing the Toeplitz matrix based on fourth-order cumulant, the Toeplitz matrix is of a joint diagonalization structure, and therefore no priori knowledge about the signal source number is needed; a new cost function is designed, and therefore the direction of arrival can be effectively estimated.

Description

technical field [0001] The invention relates to the field of signal processing, in particular to a method and system for direction finding of coherent signals with unknown number of signal sources. Background technique [0002] Direction finding using spatially distributed sensor arrays is an important task in applications such as radar, sonar, and wireless communication. At present, many DOA estimation algorithms have been proposed. Among them, subspace-based algorithms, such as ESPRIT and MUSIC algorithms, provide a good solution for estimating DOA under the assumption that the conditions are met. The assumption is that the number of sources is known, the sources are uncorrelated or partially correlated and the noise is spatially uncorrelated white noise, that is, the covariance matrix is ​​proportional to the identity matrix. When any one of the assumptions is not true, the performance of the subspace-based algorithm will be severely degraded. [0003] In actual situati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00G01S3/00
Inventor 黄磊钱诚蒋双杨云川
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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