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An Orthogonal Projection-Based Null Spreading Method of Transmit Beam

A technology of transmitting beams and nulling widening, which is applied to radio wave measurement systems, instruments, etc., and can solve problems such as inability to form wide nulling

Inactive Publication Date: 2018-01-12
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0017] Aiming at the defect that the traditional orthogonal projection algorithm cannot form wide nulls, the present invention proposes a method for widening nulls of transmitting beams based on orthogonal projections

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  • An Orthogonal Projection-Based Null Spreading Method of Transmit Beam
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  • An Orthogonal Projection-Based Null Spreading Method of Transmit Beam

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Embodiment Construction

[0035] The present invention aims to find out the left and right intervals of each zero trap, and reconstruct the steering vector matrix to reduce the amount of data. Through the Gram-Schmidt orthogonalization method, the inverse calculation of the matrix is ​​avoided, so that the wide zero-notch beam pattern can be obtained quickly, further reducing the amount of calculation, and improving the system performance.

[0036] Since the zeroing direction of the transmitting end is known, so at θ 1 ,θ 2 ,…,θ K K zero-setting directions can be directly passed through the steering vector matrix A=[a(θ 1 ) a(θ 2 ) … a(θ K )] to express the subspace of the zeroing direction, and then project the steering vector of the transmitting beam on the orthogonal complement space of the direction to be zeroed, and the optimal weight can be obtained

[0037]

[0038]

[0039] Among them, a(θ 0 ) means θ 0 The steering vector for the direction. is the orthogonal complement space tha...

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Abstract

The invention discloses a method for widening a transmitting beam nulling based on an orthogonal projection, and relates to a digital array radar transmitting beam nulling widening technology. The present invention utilizes the reconstructed zero-setting vector matrix, which greatly reduces the amount of data. At the same time, in order to avoid the matrix inversion operation, the idea of ​​Gram-Schmidt Orthogonalization (GSO) is introduced, and a recursive method is used to carry out orthogonal complementation. space derivation. The invention is suitable for quickly and flexibly realizing the nulling widening of the transmitting beam and enhancing the anti-interference performance of the system under the condition that the directing direction of the transmitting beam, the zeroing direction and the nulling width are known.

Description

technical field [0001] The invention relates to a digital array radar transmission beam nulling widening technology, in particular to a transmission beam nulling widening method based on orthogonal projection. Background technique [0002] Beamforming methods can be classified into transmit beamforming and receive beamforming. Transmit beamforming mainly includes the following technical points: 1) The transmit beam forms a narrow main beam in the desired direction to enhance the desired signal, and at the same time forms a null in the undesired direction to suppress the transmit power in the undesired direction or offset; 2) Some kind of adaptive algorithm and digital signal processing technology need to be used to calculate the weight loaded on each array element, and the weight can be updated by software. Transmit beamforming is also called transmit pattern design. Usually, transmit pattern design does not depend on received data and is designed offline. However, prior in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/02
CPCG01S7/02
Inventor 谢菊兰吴若增李昕亚邓金花何子述
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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