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Ultra-low side lobe adaptive digital beam forming (ADBF) method for digital array

A digital array and digital beam technology, applied in the field of ultra-low sidelobe adaptive digital beamforming, can solve problems such as the inability to effectively control the adaptive beam sidelobe level, and achieve improved sidelobe performance, less computation, and faster convergence. Effect

Inactive Publication Date: 2012-07-25
HOHAI UNIV
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Problems solved by technology

[0021] The purpose of the present invention is to solve the problem that the existing array element and sub-array ADBF can not effectively control the adaptive beam sidelobe level by calculating the adaptive weight based on the maximum output signal-to-noise ratio criterion. On the basis of in-depth analysis of the ASLC sidelobe level control mechanism, A beam domain dimensionality reduction ADBF algorithm based on sidelobe cancellation structure is proposed

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  • Ultra-low side lobe adaptive digital beam forming (ADBF) method for digital array
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  • Ultra-low side lobe adaptive digital beam forming (ADBF) method for digital array

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Embodiment Construction

[0045] Based on the sidelobe canceller structure, the invention proposes a beam domain dimensionality reduction ADBF algorithm for designing auxiliary beams for interference sources and adaptively canceling interference signals in conventional and beams. Compared with the subarray ADBF, the algorithm in this paper has a lower degree of freedom in adaptive processing and faster convergence speed; compared with the ASLC technology, the algorithm in this paper optimizes the interference-assisted beam design, and the sidelobe performance of the adaptive beam is further improved. In this paper, the algorithm is derived based on the azimuth line array synthesized by the digital array and the pitch, but the idea in this paper can be extended to the two-dimensional array of azimuth and elevation.

[0046] 1. Digital array ADBF signal model

[0047] Assume that the digital array is a rectangular array with M dimensions in azimuth and N dimensions in elevation, and the spacing between a...

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Abstract

The invention discloses an ultra-low side lobe adaptive digital beam forming (ADBF) method for a digital array. The method comprises four steps of conventional formation of a sum beam, interference airspace direction finding of a beam domain, construction of interference auxiliary beams and calculation of an adaptive weight; and specifically, the ADBF weight is calculated in a beam domain dimension reduction space for the auxiliary beams in the interference direction by using a digital array adaptive design. A theoretical analysis and a simulation result show that the algorithm adaptively inhibits interference, has good ultra-low side lobe beam shape preserving performance and is high in convergence rate, low in calculation quantity and suitable for the engineering application.

Description

technical field [0001] The invention relates to an ultra-low side lobe adaptive digital beam forming method in the field of digital array beam forming. Background technique [0002] Digital arrays have been widely used in radar, communication and other fields. Aiming at the increasingly complex electromagnetic environment, the new generation of radar and communication systems is based on digital arrays to further study Adaptive Digital Beamforming (ADBF) technology at the receiving end to suppress various active interferences. As an application of adaptive filtering in array signal processing, the research on ADBF technology has been carried out for more than 30 years. Its core idea is to realize adaptive zeroing of interference under the conformity of the antenna main beam. The previous research work was mainly based on array-level signals, and the subsequent research on sub-array-level ADBF technology for large-scale phased array systems [1-6] . [0003] ADBF is an effe...

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Application Information

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IPC IPC(8): G01S7/36
Inventor 沈明威朱岱寅韩国栋
Owner HOHAI UNIV
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