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Compressed sensing doa estimation method based on unknown mutual coupling information under nested arrays

A technology of compressed sensing and nested arrays, applied to direction finders using radio waves, radio wave direction/bias determination systems, etc., can solve problems such as estimation performance degradation

Active Publication Date: 2020-06-16
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0007] The purpose of the present invention is to propose a compressed sensing DOA estimation method based on unknown mutual coupling information under nested arrays for the problem that the DOA estimation model mismatch leads to a serious decline in estimation performance when there is mutual coupling effect under nested arrays.

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  • Compressed sensing doa estimation method based on unknown mutual coupling information under nested arrays

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[0082] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the implementation methods and accompanying drawings.

[0083] see figure 1 , the implementation process of the compressed sensing DOA estimation method based on unknown mutual coupling information under the nested matrix of the present invention is:

[0084] (1) Calculate the autocorrelation matrix of the received signal, and use the data covariance matrix as its estimated value;

[0085] (2) Vectorization processing, constructing a virtual array equivalent to a single snapshot to receive data, that is, performing vectorization processing on the obtained autocorrelation matrix, and obtaining the vectorization processing result z;

[0086] (3) Build an optimization problem model:

[0087] in P is the block representation result of the incident signal, Indicates the noise power, vecto...

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Abstract

The invention discloses a compressed sensing DOA estimation method based on unknown mutual coupling information under a nested array, which comprises the following steps: calculating an autocorrelation matrix of a received signal of a nested array; performing vectorization processing on the obtained autocorrelation matrix; Build an optimization problem model based on the obtained vectorization processing results; divide the space evenly, construct a complete dictionary set; substitute the complete dictionary set into the optimization problem model and solve it, and obtain the DOA estimation block result; calculate the DOA estimate based on the DOA estimation block result result. The present invention is used for DOA estimation of nested arrays when there is mutual coupling effect, and can effectively solve the problem of severe degradation of estimation performance caused by DOA estimation model mismatch. The present invention does not need to know mutual coupling information, and has high degree of freedom and resolution performance Good advantage, it can handle more incident signals than the number of physical array elements.

Description

technical field [0001] The invention relates to a direction of arrival estimation technology in the field of array signal processing, in particular to a compressed sensing DOA estimation method based on unknown mutual coupling information under a nested array. Background technique [0002] Direction-of-arrival (DOA) estimation of signals is an important part of the field of array signal processing. It refers to the use of antenna arrays to sense and receive spatial acoustic signals and electromagnetic signals, and then use modern signal processing methods to quickly and accurately Estimating the incident direction of the signal source has important application value in radar, sonar, wireless communication and other fields. With the continuous advancement of science and technology, there are higher and higher requirements for the degree of freedom that the array can achieve when estimating the signal direction of arrival. [0003] In signal DOA estimation processing, the MUS...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S3/14
CPCG01S3/14
Inventor 谢菊兰干鹏罗紫惠杨雪何子述
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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