Method for estimating high-accuracy arrival direction without knowing information source number

A direction of arrival estimation and high-precision technology, which is applied in directions such as direction-determining direction finder, direction finder using radio waves, directional multi-channel system using radio waves, etc. Effects of reduction, good performance, high estimation accuracy

Inactive Publication Date: 2014-10-01
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

[0004] What the present invention aims to solve is the problem that the existing DOA estimation method with unknown number of sources is limited by the aperture of the array, and proposes a high-precision DOA estimation method with unknown number of sources. When the number of sources is unknown, The direction of arrival of the signal can be estimated with high precision without estimating the number of sources, and without eigendecomposition, the calculation amount is greatly reduced, and it is convenient for hardware implementation

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  • Method for estimating high-accuracy arrival direction without knowing information source number
  • Method for estimating high-accuracy arrival direction without knowing information source number
  • Method for estimating high-accuracy arrival direction without knowing information source number

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Embodiment Construction

[0031] by figure 2 Taking the spherical conformal array antenna model as an example to illustrate, the high-precision DOA estimation method for the unknown number of sources of the present invention, such as figure 1 shown, including the following steps:

[0032] 1. Utilize M antenna receivers placed on a spherical surface to form an M-element conformal spherical array antenna.

[0033] figure 2 Shown is an M-element array antenna, the radius of the spherical carrier is r, "×" in the figure indicates the array element, θ is the angle formed by the point where the array element is located and the positive direction of the z-axis, is the angle formed by the point where the array element is located and the positive direction of the x-axis, and the position of the mth array element is

[0034] 2. N uncorrelated narrowband signals of the same frequency are incident to the array antenna.

[0035] The center frequency is ω 0 N uncorrelated co-frequency narrowband signals fr...

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Abstract

The invention discloses a method for estimating a high-accuracy arrival direction without knowing an information source number. Time smoothing processing is carried out on data received by an antenna array by setting K different time smoothing intervals to built K space-time autocorrelation matrixes; a final combined space-time autocorrelation matrix and a spatial spectrum function of arrival direction estimation are calculated; spectrum peak searching is carried out on the spatial spectrum function by gradually changing the searching direction, and then the information source number and the arrival direction are estimated. By means of the method for estimating the high-accuracy arrival direction without knowing the information source number, the arrival direction of signals is estimated without estimating the information source number in advance or carrying out characteristic decomposition on the autocorrelation matrixes of the received signals. Thus, the method is high in reliability, small in workload and easy to achieve through hardware, and makes application of arrival direction estimation to an actual system possible.

Description

technical field [0001] The invention belongs to the technical field of array signal processing, and in particular relates to a high-precision direction-of-arrival estimation method with unknown number of sources. Background technique [0002] Signal DOA estimation is an important issue in the field of array signal processing. After decades of development, many DOA estimation methods have been proposed, such as the most classic estimation algorithms such as MUSIC and ESPRIT. However, few of these algorithms can be applied in actual scenarios. There are two main reasons. First, most DOA estimation methods assume that the number of sources is known, but the number of sources is unknown in actual situations. Yes, this requires pre-estimating the number of sources, and the estimation algorithm of the number of sources is still very immature; second, these high-resolution DOA estimation methods need to perform eigendecomposition on the received autocorrelation matrix, which has a ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S3/00
CPCG01S3/74
Inventor 谢跃雷彭诚诚欧阳缮刘庆华晋良念陈紫强蒋俊正李民政
Owner GUILIN UNIV OF ELECTRONIC TECH
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