Space domain-polarization domain self-adaption-based polarization area array direction of arrival estimation method under main lobe interference

A technology of direction of arrival estimation and main lobe interference, which is used in directions such as direction determination directors, radio wave measurement systems, measurement devices, etc.

Pending Publication Date: 2021-06-25
AIR FORCE EARLY WARNING ACADEMY
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Problems solved by technology

[0006] In view of this, the present invention provides a method for estimating direction of arrival of polarized plane array waves under main lob

Method used

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  • Space domain-polarization domain self-adaption-based polarization area array direction of arrival estimation method under main lobe interference
  • Space domain-polarization domain self-adaption-based polarization area array direction of arrival estimation method under main lobe interference
  • Space domain-polarization domain self-adaption-based polarization area array direction of arrival estimation method under main lobe interference

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Embodiment Construction

[0014] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments. Assume that the array is composed of orthogonal electric dipoles M 1 × M 2 Uniform area array, the array is arranged on the xoz plane, M 1 Indicates the number of columns in the array, M 2 Indicates the number of rows of the array, the distance between the array elements is half a wavelength, denoted as d, and the pitch angle of the incident signal relative to the array is The azimuth angle is θ, the polarization auxiliary angle is γ, the polarization phase difference is η, and the steering vector of a single orthogonal electric dipole is expressed as

[0015]

[0016] The airspace steering vector of the array is expressed as

[0017]

[0018] in

[0019]

[0020]

[0021] in, and denote the spatial guidance vectors of z-axis and x-axis respectively, (·) T Represents the transpose operation, and the symbol λ represents the ...

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Abstract

The invention discloses a method for estimating the direction of arrival of a polarization area array under main lobe interference based on spatial domain-polarization domain self-adaption. The method comprises the following steps of firstly, receiving data according to each array element of an area array to obtain a spatial domain-polarization domain joint adaptive weight, outputting data of a row of linear arrays, and then solving an azimuth angle of a target by adopting a maximum likelihood method algorithm; receiving data according to each row of array elements of an area array to obtain a spatial domain-polarization domain joint adaptive weight, outputting data of a column of linear array, and then solving a pitch angle of a target by adopting a maximum likelihood method algorithm. According to the method, multiple interferences in a main lobe can be resisted through spatial domain-polarization domain joint self-adaption, a problem that the target angle estimation precision is low due to the fact that spatial domain self-adaption under main lobe interference can cause main beam distortion is solved, and polarization self-adaption can only resist one interference in the main lobe although the main beam distortion cannot be caused.

Description

technical field [0001] The invention belongs to the field of array signal processing, and in particular relates to a direction-of-arrival estimation method for polarized plane array waves under main lobe interference based on space domain-polarization domain self-adaptation. Background technique [0002] For missiles to intercept enemy targets, it is necessary to accurately obtain the direction of arrival (Direction of Arrival, DOA) of the target. However, in current exercises or actual combat, the interference that the enemy often releases is the main lobe interference, which will greatly reduce the probability of the missile intercepting the target. For sidelobe interference, radar can filter out most of the interference signals through airspace adaptive processing, and the accuracy of adaptive monopulse angle measurement is high; for main lobe interference, airspace adaptive processing will cause main lobe distortion, which will lead to adaptive monopulse angle measuremen...

Claims

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Application Information

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IPC IPC(8): G01S3/48
CPCG01S3/48
Inventor 李槟槟陈辉刘维建王永良张昭建周必雷
Owner AIR FORCE EARLY WARNING ACADEMY
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