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DOA estimation method of 3-axis cross array

A technology of axis crossing and DOA, which is applied in the field of DOA estimation of 3-axis crossing arrays, and can solve problems such as inapplicable solutions

Active Publication Date: 2015-03-11
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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Problems solved by technology

Since the rotation invariant equation of the ESPRIT algorithm does not have the affine structure required by STLN, STLN is not suitable for solving the ESPRIT (Estimating Signal Parameters via Rotational Invariance Techniques) algorithm

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  • DOA estimation method of 3-axis cross array
  • DOA estimation method of 3-axis cross array
  • DOA estimation method of 3-axis cross array

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Embodiment Construction

[0059] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0060] The 3-axis cross array structure is attached figure 1 As shown, it consists of three linear sub-arrays (with the origin as the geometric center) along the x-axis, y-axis, and z-axis. Assuming that all antenna elements are independent and equidistant, the distance δ between the elements of the 3 axes is the same. Assume that the number of elements in the 3-axis cross array is M, and there are d far-field narrowband signals arriving at the array, where M=M x +M y +M z , where M x , M y , M z Respectively represent the number of array elements contained in the sub-array in the x, y, and z-axis directions. Model the array receive signal as:

[0061] x(t)=As(t)+n(t) (1)

[0062] where s(t)=[s 1 (t),...,s d (t)] T is the signal vector, n(t)=[n 1 (t),...,n M (t)] T Contains additive sensor noise; is the signal-steering vector m...

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Abstract

The invention brings forward an SLS-NC-ESPRI algorithm based DOA estimation method of a 3-axis cross array, and is applied to estimation of the DOA of a strict second-order non-circular (NC) signal. Different from a conventional DOA estimation algorithm, the method brought forward by the invention has the following advantages: first of all, the by use of the NC characteristic of the signal, the virtual space of the array is expanded, the estimation precision is improved, and a detectable source number is enabled to be increased; secondly, the overlapping structure of sub-array configuration is utilized, the overlapping of signal subspace errors is taken into consideration, and shift-invariant equations in three cross array axes are effectively solved by use of a structure least square (SLS) method; and finally, through a mode of increasing constraint conditions, it is ensured that the three axial directions has approximately the same characteristic vectors, the rank defect problem introduced when arrival signals have the same projection at a certain axial direction is solved, the algorithmic validity is ensured, and a more accurate DOA estimated value is provided.

Description

technical field [0001] The invention relates to the technical field of array signal processing, in particular to a DOA estimation method of a 3-axis cross array. Background technique [0002] DOA estimation of incoming signals has been widely used in many fields such as radar, sonar, mobile communication and biomedical imaging. Numerous techniques for solving high-resolution DOA estimation problems have been proposed, among which more classic techniques include: extremum search, polynomial root, matrix rotation invariance, etc. As a matrix rotation-invariant method, the ESPRIT algorithm can effectively use the rotation-invariant properties of the signal subspace to calculate the DOA of the signal, and can give an analytical solution. Usually, the ESPRIT algorithm uses least squares (Least Squares, LS) or total least squares (Total Least Squares, TLS) to solve the DOA estimate, because the LS and TLS methods do not consider the characteristic that the overlapping parts of th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
CPCG01S3/14
Inventor 黄磊石运梅尤琳王永华
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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