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Two-dimensional DOA estimation method

A coupling matrix and rectangular technology, applied in the field of DOA estimation, can solve difficult problems

Active Publication Date: 2017-04-19
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

For example, it is easy to implement the method of compensating for the influence of antenna coupling through the received coupling impedance, but since the coupling relationship between antennas often changes with time and the environment, it is possible to measure the coupling impedance in real time in practical applications is very difficult

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Embodiment Construction

[0019] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0020] First, the existing algorithm on which the present invention is based will be described.

[0021] 1. MUSIC algorithm

[0022] For a uniform linear array, when there is no coupling between antennas and the received signals are irrelevant, construct the received signal model X=AS+n; then calculate the covariance matrix R for the received signal model x =E[XX H ]; to R x The noise subspace E can be obtained by performing eigendecomposition n ;Construct the spatial spectral function:

[0023]

[0024] where a(θ) is the direction vector of the signal. When the signal is injected, since the direction vector of the signal is orthogonal to the noise subspace, the d...

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Abstract

The invention provides a two-dimensional DOA estimation method. Under the assumption that adjacent P array elements are in the coupling state, two DOA estimation algorithms, higher in degree of accuracy, are provided based on the reconstruction of an array direction vector matrix and the selection of auxiliary array elements. Meanwhile, a processing method in the signal coherent condition is provided. Based on two methods provided in the invention, the two-dimensional DOA of a uniform rectangular antenna array in the coupling state can be accurately estimated in both the signal coherent condition and the signal incoherent condition.

Description

technical field [0001] The present invention relates to the technical field of communication, and more specifically, to a DOA estimation method. Background technique [0002] At present, DOA (Direction of Arrival) estimation has always played a very important role in the field of signal processing, such as radar and sonar systems. [0003] In the past few decades, many researchers have made a lot of contributions to the DOA estimation algorithm of uniform linear array, such as the multi-channel signal classification (MUSIC) algorithm, ESPRIT algorithm, etc., among which the MUSIC algorithm is one of the most widely used algorithms. . However, these algorithms are proposed under the assumption that there is no coupling between antennas, which will cause serious errors in the final DOA estimation. When the distance between the antennas is small, the coupling between the antennas has a serious impact on the DOA estimation, which will affect the performance of the DOA estimati...

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Application Information

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IPC IPC(8): G01S3/14
CPCG01S3/14
Inventor 张治王文婕何兴斌张平
Owner BEIJING UNIV OF POSTS & TELECOMM
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