Low-altitude target direction-of-arrival estimating method for radar

A technology for direction of arrival estimation and low-altitude targets, applied to radio wave measurement systems, instruments, etc., can solve problems such as poor resolution and large amount of calculation

Inactive Publication Date: 2014-04-30
XIDIAN UNIV
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Problems solved by technology

Although the maximum likelihood estimation algorithm and the generalized MUSIC algorithm have high resolution for coherent signals, they both require two-dimensional spatial spectrum search and a large amount of calculation; the L1-SVD angle estimation algorithm based on multi-snapsh

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  • Low-altitude target direction-of-arrival estimating method for radar
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  • Low-altitude target direction-of-arrival estimating method for radar

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[0034] The present invention will be further explained below in conjunction with the drawings:

[0035] Reference figure 1 , Is a schematic flowchart of a method for estimating the direction of arrival of a low-altitude target for radar according to the present invention. The method for estimating the direction of arrival of low-altitude targets for radar includes the following steps:

[0036] S1: The antenna array of the radar is N equidistant array elements (ie N-element linear array), N is a natural number greater than 1, and N equidistant array elements include the first element to the Nth element; each array The meta receives the echo signal of the target, and then performs the first sampling to the Lth sampling (digital sampling) of the echo signal, where L is a natural number greater than 1. The data obtained by the nth array element after the lth sampling is x n (l), where n is 1 to N, and l is 1 to L.

[0037] According to x n (l), obtain the data vector matrix X (N×L orde...

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Abstract

The invention belongs to the technical field of estimation of the direction of arrival of radar and discloses a low-altitude target direction-of-arrival estimating method for radar. The low-altitude target direction-of-arrival estimating method for the radar comprises the steps that an antenna array of the radar receives echo signals, the echo signals are sampled to obtain a data vector matrix, singular value decomposition is conducted on the data vector matrix to enable a corresponding dimensionality-reduction data vector and a corresponding noise subspace matrix to be generated, a guide vector matrix is obtained, a corresponding multi-path attenuation vector is obtained according to the noise subspace matrix and the guide vector matrix, a composite guide vector is constructed, a sensing matrix is constructed, a regularization parameter is obtained, and the direction of arrival is obtained by solving a corresponding mathematical model.

Description

technical field [0001] The invention belongs to the technical field of radar direction-of-arrival estimation, in particular to a method for estimating the direction-of-arrival of a low-altitude target used by radar. Background technique [0002] When the radar is used for long-range early warning, the effective distance is relatively long. Since the flying altitude of long-distance low-altitude targets is mostly in the low-altitude field below several kilometers, the strong ground-sea clutter will reduce the signal-to-clutter ratio of the echo signal, making it difficult to accurately Get the direction of arrival (DOA). At the same time, when the radar detects and tracks low-altitude targets, it not only receives the direct wave signal, but also receives the multipath reflected echo signal, resulting in multipath effect. Since the direct wave signal and the reflected signal are highly correlated, and most of the incident angles of the two echoes differ by less than a half-p...

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Application Information

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IPC IPC(8): G01S7/41
CPCG01S7/354
Inventor 曹运合陈婷王园园刘峥刘宏伟王胜华周生华
Owner XIDIAN UNIV
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