Co-prime array coherent signal arrival angle estimation method based on electromagnetic vector sensor

An electromagnetic vector and coherent signal technology, applied in the field of signal processing, can solve problems such as loss of information, and achieve the effect of improving performance, degree of freedom and resolution

Pending Publication Date: 2019-06-18
XIDIAN UNIV +1
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Problems solved by technology

However, the virtual array derived from the coprime array is a non-uniform array, and only the uniform part can be intercepted for processing, and some

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  • Co-prime array coherent signal arrival angle estimation method based on electromagnetic vector sensor
  • Co-prime array coherent signal arrival angle estimation method based on electromagnetic vector sensor
  • Co-prime array coherent signal arrival angle estimation method based on electromagnetic vector sensor

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[0061] The parameters of the coprime array are selected as M=3, N=5, that is, the coprime array has a total of M+N-1=6 physical array elements; assuming that the number of incident narrowband signals is 10, of which there are 3 coherent signals and non-coherent signals There are 7 incident directions [-50°, -40°, -30°, -20°, -10°, 0°, 10°, 20°, 30°, 40°], the signal-to-noise ratio is 10dB, The number of snapshots t=1024, the regularization parameter μ is 2.5×10 -3 / ((log t) 2 log(M+N-1)).

[0062] figure 2 A schematic diagram of the constructed coprime array structure is given, and it can be seen from the figure that the array elements are arranged non-uniformly, and this arrangement has many advantages; image 3 A pair of uniform sparse sub-arrays of the coprime array is given. It can be seen from the figure that the element interval of each subarray is greater than half a wavelength, and the interval of the array has a certain relationship with the number of elem...

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Abstract

The invention provides a co-prime array coherent signal arrival angle estimation method based on an electromagnetic vector sensor and mainly solves a problem of information loss caused by holes in virtual arrays of co-prime arrays and estimation of coherent sources in a method in the prior art. The method is characterized in that an electromagnetic vector sensor co-prime array is constructed as areceiving array; receiving data of the electromagnetic vector sensor mutual array is divided into six sub-array data, and subarray data covariance matrix vectorization and de-redundancy are performed;receiving data of a uniform sub-array virtual array is constructed through filling array elements; a Toeplitz covariance matrix of a receiving signal of the uniform sub-array virtual array is solved;de-coherent full-rank Toeplitz matrices are obtained by arithmetic averaging, feature decomposition is performed, and the MUSIC method is utilized to estimate the angle of arrival of the signal. Themethod is advantaged in that angle of arrival estimation of the coherent signal can be achieved if the number of signal sources is greater than the number of physical array elements, and estimation accuracy and the estimated number of arrival angles are improved.

Description

technical field [0001] The invention belongs to the field of signal processing, in particular to a method for estimating the angle of arrival of a coherent signal array based on an electromagnetic vector sensor. Background technique [0002] The direction of arrival (DOA) estimation is an important branch in the field of array signal processing. It refers to the use of array antennas to receive airspace signals, and to process the received signals through modern signal processing techniques to achieve signal DOA estimation. Traditional DOA estimation is mainly carried out by Multiple Signal Classification (MUSIC) method, Estimation of Signal Parameters by Rotation Invariant Technique (ESPRIT) method and its derivative methods. At present, most classical DOA estimation algorithms are limited to uniform linear arrays. For a uniform linear array with N total array elements, the maximum number of airspace targets that can be identified by traditional DOA estimation methods is N-...

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Application Information

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IPC IPC(8): G01S3/14
Inventor 王兰美王欢褚安亮王桂宝廖桂生孙长征
Owner XIDIAN UNIV
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