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Out-of-grid target direction of arrival (DOA) estimation method based on amended dictionary

A direction estimation, target wave technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as performance degradation and dictionary mismatch

Inactive Publication Date: 2015-11-25
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of performance degradation caused by dictionary mismatch in the DOA estimation method based on sparse reconstruction, and improve the accuracy of DOA estimation of off-grid targets by correcting the dictionary

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  • Out-of-grid target direction of arrival (DOA) estimation method based on amended dictionary
  • Out-of-grid target direction of arrival (DOA) estimation method based on amended dictionary
  • Out-of-grid target direction of arrival (DOA) estimation method based on amended dictionary

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Embodiment Construction

[0034] Below in conjunction with accompanying drawing and embodiment the present invention will be described in further detail, as figure 1 Shown is a schematic flow chart of the method for estimating the direction of arrival of off-grid targets based on the correction dictionary in the present invention, which specifically includes the following steps:

[0035] Step 1. Assume that a uniform linear array with M array elements receives K far-field narrowband signals, and obtain:

[0036] y ( t ) = A ( θ ~ ) s ~ ( t ) ...

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Abstract

The invention belongs to the field of array signal processing, relates to an out-of-grid target direction of arrival (DOA) estimation method based on an amended dictionary, and is used for overcoming a problem of performance reduction caused by dictionary mismatching in a DOA estimation method based on sparse reconstruction. The method provided by the invention comprises the steps of firstly carrying out grid division on an angle of a space region so as to acquire an initial dictionary, amending the initial dictionary, and constructing a preliminary sparse representation model by using the amended dictionary; solving the preliminarily constructed sparse representation model by using an SOMP (Simultaneous Orthogonal Matching Pursuit) method, acquiring a preliminary incoming wave estimation direction, then carrying out grid division again near the preliminary incoming wave estimation direction, acquiring a new dictionary and a new sparse representation model, solving the updated sparse representation model by using the SOMP method again, and acquiring a new signal incoming wave estimation direction; and finally searching a spectral peak in a designated area of each signal incoming wave estimation direction by using a MUSIC method so as to acquire the ultimately estimated signal incoming wave direction. Compared with an existing Taylor expansion based method, the method provided by the invention improves the estimation precision for the incoming wave direction.

Description

technical field [0001] The invention belongs to the field of array signal processing. Aiming at the problem of performance degradation caused by dictionary mismatch in a direction-of-arrival estimation method based on sparse reconstruction, a method for estimating direction-of-arrival of an off-grid target based on a modified dictionary is proposed. Background technique [0002] Direction of Arrival (DOA) estimation has been an important research topic in array signal processing in the past few decades, and has a wide range of applications in radar, sonar and other fields. The early DOA estimation method has the beamforming method. The resolution of this method mainly depends on the number of array elements and the distance between the array elements. The limited resolution is an important defect of the beamforming method. How to break through the limitation of the array aperture and improve the resolution has once become a hot research issue in spatial spectrum estimation. ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 段惠萍钱志刚拓天甜方俊
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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