Two-dimensional AoA (Angle of Arrival) estimation method based on separate electromagnetic vector sensor array

A sensor array and electromagnetic vector technology, applied in radio wave measurement systems, instruments, measurement devices, etc., can solve the problems of no time-domain rotation invariance, inability to apply two-dimensional arrival angle estimation, algorithm failure, etc., and achieve easy implementation , improved estimation accuracy, and low mutual coupling effects

Inactive Publication Date: 2013-09-18
XIDIAN UNIV
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Problems solved by technology

However, the parallel line structure and its corresponding angle-of-arrival estimation algorithm have two shortcomings: (1) When the incident signal does not have time-domain rotation invariance, such as for narrow-band radar signal angle-of-arrival estimation, it usually needs to be down-converted to baseband, The signal envelope is basically unchanged, so it does not have time-domain rotation invariance, and the existing algorithm fails
(2) The parallel line structure can only expand the one-dimensional aperture of the array, and cannot be applied to two-dimensional angle of arrival estimation

Method used

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  • Two-dimensional AoA (Angle of Arrival) estimation method based on separate electromagnetic vector sensor array
  • Two-dimensional AoA (Angle of Arrival) estimation method based on separate electromagnetic vector sensor array
  • Two-dimensional AoA (Angle of Arrival) estimation method based on separate electromagnetic vector sensor array

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Embodiment Construction

[0022] refer to figure 1 , the specific implementation steps of the present invention are as follows:

[0023] Step 1: Extract the received data x(t) of the separated electromagnetic vector sensor array:

[0024] The present invention proposes a new array structure, such as figure 2 shown. From figure 2 It can be seen that the array manifold of the array structure proposed by the present invention is:

[0025] b = a ~ e j 2 π λ Δ x , x ...

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Abstract

The invention discloses a two-dimensional AoA (Angle of Arrival) estimation method based on a separate electromagnetic vector sensor array. The two-dimensional AoA estimation method based on the separate electromagnetic vector sensor array is mainly used for solving the problem that the two-dimensional AoA estimation accuracy is low in a process that a non-time-domain invariable-rotation target is positioned and tracked by vector sensor arrays. The method comprises the steps: (1) constructing received data of the separate electromagnetic vector sensor array; (2) carrying out eigenvalue decomposition on the received data so as to obtain signal subspaces; (3) aiming at the signal subspaces, obtaining a first-dimension ambiguous direction-cosine fine estimate by using space-domain rotation invariance; (4) obtaining an unambiguous direction-cosine rough estimate by using a vector cross multiplication method; (5) obtaining a second-dimension ambiguous direction-cosine fine estimate by using a phase interference method; and (6) obtaining a two-dimensional AoA estimate through combining ambiguous direction-cosine fine estimates and the unambiguous direction-cosine rough estimate. The method has the advantage that the two-dimensional AoA estimation accuracy of the non-time-domain invariable-rotation target is increased greatly and can be applied to the precise positioning and tracking of targets by using radar.

Description

technical field [0001] The invention belongs to the technical field of array signal processing, relates to two-dimensional angle-of-arrival estimation of polarized arrays, and can be used for target positioning and tracking. Background technique [0002] The common-point electromagnetic vector sensor is composed of three electric dipoles and three magnetic rings, and the six components are orthogonal to each other. Because its antenna can not only obtain the space and time domain information of the target signal, but also obtain the polarization information of the target, the electromagnetic vector sensor and its array have been extensively studied, especially the target angle of arrival based on the electromagnetic vector sensor and its array. estimate. Many classic super-resolution algorithms for traditional scalar arrays, such as ESPRIT, multiple signal classification MUSIC, and maximum likelihood algorithms, have been successfully applied to electromagnetic vector senso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S3/58
Inventor 陈伯孝郑桂妹杨明磊郑巧珍
Owner XIDIAN UNIV
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