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Radar adaptive beam forming method based on oblique projection filtration

An adaptive beam, oblique projection technology, applied in the field of radar, can solve the problems of main beam deformation, side lobe level increase, etc., to achieve the effect of high signal-to-noise ratio output

Active Publication Date: 2015-12-09
XIDIAN UNIV
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Problems solved by technology

[0008] In order to overcome the deficiencies of the above-mentioned prior art, the object of the present invention is to propose a radar adaptive beamforming method based on oblique projection filtering, which can solve the problems of side lobe level rise and main beam deformation, and does not need to estimate The direction of the main lobe interference; when there are multiple main lobe interferences, the method can still maintain good antenna pattern conformal performance and filter output performance, and can maintain robust filter output performance in the case of a low number of snapshots

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  • Radar adaptive beam forming method based on oblique projection filtration
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Embodiment Construction

[0024] refer to figure 1 , the radar adaptive beamforming method based on oblique projection filtering of the present invention comprises the following specific steps:

[0025] Step 1, set the array to be composed of N array elements, the signal received by N array elements is x(t), the signal contains interference and noise, and the interference includes main lobe interference and side lobe interference; construct N arrays The covariance matrix R of the received signal x(t) xx ; The covariance matrix R of the signal x(t) received by N array elements xx Perform eigenvalue decomposition to obtain the interference signal subspace U J and noise signal subspace U n , where t represents the time variable.

[0026] The specific sub-steps of step 1 are:

[0027] 1.1 Set the array to be composed of N array elements; there are M main lobe interferences and P side lobe interferences in the setting space, M+Pm (t), the incident angle of the mth main lobe interference is θ m , 1≤m≤M...

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Abstract

The invention discloses a radar adaptive beam forming method based on oblique projection filtration. The method comprises the following steps: (1) signals received by N array elements in an array are set to be x(t), and interference and noise are included; a covariance matrix Rxx for the signals x(t) received by the N array elements is built, eigenvalue decomposition is carried out on the matrix, and interference signal subspace UJ and noise signal subspaceUn are obtained; (2) an interference judgment rule is built, and signal subspace Em for main lobe interference and signal subspace for side lobe interference are determined respectively in the interference signal subspace UJ; (3) an oblique projection operator B is built to carry out oblique projection filtration treatment on the signals x(t) received by the N array elements, signals y(t) after oblique projection filtration treatment are obtained, and a covariance matrix Ryy is built; (4) noise in the covariance matrix Ryy for the signals y(t) after oblique projection filtration treatment is corrected, and a covariance matrix R after correction is obtained; and (5) according to the covariance matrix R after correction, adaptive beam forming is carried out on the signals x(t) received by the N array elements, and signals z(t) after adaptive beam forming are obtained.

Description

technical field [0001] The invention belongs to the technical field of radar, in particular to a radar adaptive beamforming method based on oblique projection filtering, which can be used to suppress main lobe interference and side lobe interference under the condition that main lobe interference and side lobe interference exist simultaneously. Background technique [0002] In a complex signal environment, not only the desired signal but also a large number of interference signals exist. When the interference signal is stronger than the desired signal, the desired signal in the output of the array will be covered by the interference signal. To reduce the influence of interfering signals, the best way is to make the zero position of the array antenna pattern always point to the direction of interfering signals, and at the same time ensure that the main lobe is aligned with the desired signal direction. Since both the interference signal direction and the desired signal direct...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/28
CPCG01S7/2813
Inventor 陈伯孝项喆杨明磊
Owner XIDIAN UNIV
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