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Target direction finding method and device

A target and direction finding technology, applied in the field of radar, can solve problems such as large amount of calculation

Pending Publication Date: 2021-07-09
CHENGDU ANZHIJIE TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the embodiment of the present application is to provide a method and device for direction finding of a target to solve technical problems with a large amount of calculation

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  • Target direction finding method and device

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Experimental program
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Embodiment approach

[0075] As an implementation, the covariance matrix can be determined according to the following formula:

[0076]

[0077] Among them, R x is the covariance matrix, K is the number of data segments, X is the received data matrix, X H is the conjugate transpose of X.

[0078] The steering covariance matrix is ​​calculated according to the following formula:

[0079] Z(θ)=a(θ)×R x ×a(θ) H ;

[0080] Among them, Z(θ) is the guiding covariance matrix, a(θ) H is the conjugate transpose of a(θ).

[0081] Therefore, the corresponding propagation operator can be constructed according to the target data obtained after Fourier transform, and the spatial spectrum search can be performed according to the propagation operator, so that the process of eigendecomposition can be avoided and the calculation amount of direction finding can be reduced.

[0082] In addition, as an implementation manner, the step of performing spatial spectrum search according to the propagation operato...

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Abstract

The invention provides a target direction finding method and device, and is applied to the radar field. When a transmitting antenna in an array antenna scans a radar field of view, a beam forming method is adopted for scanning, and only an area in a first preset size range is scanned at a time point, whether a target to be subjected to direction finding exists in the area is determined, and the approximate direction of the target to be subjected to direction finding is roughly determined; therefore, compared with the mode of scanning the whole radar view field, the method and device have the advantages that the direction finding calculation amount can be reduced, the target angle calculation accuracy can be improved, and the interference of other targets can be reduced. Besides, when the direction data of the target to be subjected to direction finding is determined, a propagation operator algorithm is adopted, the process of characteristic decomposition is avoided, and the calculated amount of direction finding can also be reduced.

Description

technical field [0001] The present application relates to the field of radar, in particular, to a method and device for finding direction of a target. Background technique [0002] In the field of radar, antennas are widely used, and the antenna system composed of many identical single antennas (such as symmetrical antennas) arranged in a certain order is called an array antenna, and the signal collected by the array antenna is called an array signal. [0003] Adaptive spatial filtering and spatial spectrum estimation are the two most important research directions in array signal processing. Among them, the spatial spectrum estimation is actually the direction of arrival estimation of the space signal, so it is often called the direction of arrival positioning technology (Direction of Arrival, DOA). Because spatial spectrum estimation has a strong ability to resolve spatial signal sources and improves the ability to distinguish spatial signal sources with a beam width from ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/06G01S7/41
CPCG01S13/06G01S7/41
Inventor 杜枭刘学
Owner CHENGDU ANZHIJIE TECH CO LTD