Broadband sub-matrix adaptive beamforming method based on sub-band decomposition

An adaptive beam and sub-band decomposition technology, applied in the field of radar, can solve the problems of complex calculation, increased calculation amount, huge hardware consumption, etc.

Inactive Publication Date: 2012-07-25
XIDIAN UNIV
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AI Technical Summary

Problems solved by technology

Generally, the tapped delay line and sub-band method can be used to cancel the broadband interference, but the tapped delay line method consumes a lot of hardware and the calculation is very complicated
Using a multi-rate filter to divide into subbands can be processed in the digital domain, but the increase in the amount of computation brought by the subband division of large arrays is unbearable

Method used

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  • Broadband sub-matrix adaptive beamforming method based on sub-band decomposition
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  • Broadband sub-matrix adaptive beamforming method based on sub-band decomposition

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Embodiment Construction

[0050] refer to figure 1 , the realization steps of the invention are as follows:

[0051] Step 1, divide the phased array into several sub-arrays.

[0052] In the broadband phased array radar, the phased array array is assumed to be an equidistant linear array, the array element spacing is d, and the number of array elements is N. The multi-objective optimization algorithm is used to divide the sub-arrays. The optimized objective function is array gain, beam Width and side lobe level, assuming that the entire phased array is divided into L sub-arrays, and the number of elements in each sub-array is P n , where n=1,...,L.

[0053] Step 2, obtain subarray synthesis data Y(t).

[0054] The above sub-arrays are synthesized by microwave phase shifter, aligned with the beam pointing, and the synthesized data Y(t) is obtained:

[0055] Y(t)=TX(t),

[0056] where T is the following matrix:

[0057] T = ...

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Abstract

The invention discloses a broadband sub-matrix adaptive beamforming method based on sub-band decomposition, which mainly resolves the problem that computation burden in the prior art is high, and broadband interference signals cannot be processed and suppressed adaptively. The implementation process of the broadband sub-matrix adaptive beamforming method includes steps: 1) dividing a total matrix into a plurality of sub-matrixes, leading the sub-matrixes to be aligned with local beam pointing by the aid of microwave synthesis of a phase shifter, and obtaining sub-matrix synthesis data; 2) selecting a prototype filter and obtaining corrected analyzing and comprehensive filter banks via a cosinusoidal modulation filter bank; 3) under-sampling the sub-matrix synthesis data after the sub-matrix synthesis data pass through the analyzing filter banks, solving an adaptive weight in a narrow band and performing sub-band beamforming in the narrow band; and 4) up-sampling signals after sub-band beamforming, leading the up-sampling signals to pass through the comprehensive filter banks, and summating data of the comprehensive filter banks to obtain data after broadband adaptive beamforming. The broadband sub-matrix adaptive beamforming method has the advantages that the dimension of hardware is small, computation burden is low and broadband interference signals can be suppressed adaptively. In addition, the broadband sub-matrix adaptive beamforming method can be used for adaptive beamforming of a broadband phased array radar.

Description

technical field [0001] The invention belongs to the technical field of radar, and specifically relates to an adaptive beamforming method of a broadband phased array radar, which can be used for adaptive beamforming of a broadband sub-array, realizes adaptive suppression of broadband interference signals, and reduces equipment and computation loads. Ease of engineering implementation. Background technique [0002] With the development of radar technology, the requirements for radar are not limited to the detection of the position parameters of the target, but also the properties of the target and the subtle features of the target. The target recognition and imaging functions require the radar to have a large signal bandwidth. In addition, array radar is widely used because of its flexible beam control, high signal gain, strong interference suppression ability and high angular resolution. The wideband array radar combines the advantages of wideband radar and array radar to fu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41G01S13/02
Inventor 曹运合张伦樊友友刘峥谢荣
Owner XIDIAN UNIV
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