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Generalized sidelobe cancellation broadband beam forming method based on frequency constraint

A frequency constraint and sidelobe cancellation technology, applied in the field of radar communication, can solve the problems of high data snapshots and poor output stability

Active Publication Date: 2020-10-23
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, the input of the two channels in the GSC structure of this method is the same, resulting in poor output stability and high requirements for the number of snapshots of the data

Method used

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  • Generalized sidelobe cancellation broadband beam forming method based on frequency constraint
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  • Generalized sidelobe cancellation broadband beam forming method based on frequency constraint

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Embodiment Construction

[0037] For a better description, the following definitions are first made:

[0038] Broadband beamforming: The broadband signal beam is transmitted to the antenna, and the beam undergoes a series of processing at the receiving end of the antenna to make the beam passing through the antenna point to the desired direction. This process is collectively called broadband beamforming.

[0039] Desired signal: The desired signal, that is, the signal that can pass through without distortion after beamforming.

[0040] Down-conversion: the process of restoring the radio frequency signal to the baseband signal. The signal received by the antenna is generally the radio frequency signal processed by the carrier. If the original signal is to be processed, it needs to be decarrier and restored to the baseband signal.

[0041] A / D sampling: The baseband analog signal is sampled at a certain time interval to obtain a digital signal with discrete time and amplitude. This process of converting ...

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Abstract

The invention provides a generalized sidelobe cancellation broadband beam forming method based on frequency constraint. By performing new constraint on weight vectors of a main channel and an auxiliary channel of a GSC structure in a frequency domain, expected signals can pass through without distortion while interference is suppressed. The performance of the algorithm can be flexibly changed by controlling the number of the main channel array elements and the number of the auxiliary channel array elements, the calculation amount of the algorithm can be reduced while the degree of freedom is not wasted, and the practicability of the algorithm is improved. According to the method, the auxiliary channel weight vector is directly constrained through the constraint matrix, and the constraint matrix can be changed along with different target signals and arrays, so that the obtained auxiliary channel weight vector is most suitable for the current environment, and the premise of ensuring thatthe algorithm has high performance is also provided. According to the invention, the idea of frequency domain constraint is applied to the broadband beam forming method of generalized sidelobe cancellation without pre-delay, the calculation cost is low, and interference and noise signals can be suppressed to the greatest extent.

Description

technical field [0001] The invention belongs to the radar communication technology, and in particular relates to the generalized side lobe cancellation broadband beam forming technology. Background technique [0002] As an important array signal processing technology, broadband beamforming is widely used in many fields such as radar, sonar, communication and seismology. The generalized sidelobe cancellation structure GSC (generalized sidelobe canceller) is one of the main structures of broadband beamforming. The broadband beamforming algorithm based on this structure has a good suppression performance on interference and noise signals (see literature: An alternative approach to linearly constrained adaptive beamforming, L. Griffiths and C. Jim, IEEE Transactions on Antennas and Propagation, 1982, 30(1):27-34.). With the increasing bandwidth of processing signals, GSC-based broadband beamforming methods have gradually attracted people's attention. [0003] In practical appl...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06G01S13/02G01S7/292G01S7/35
CPCG01S7/292G01S7/354G01S13/02H04B7/0617
Inventor 谢菊兰饶申宇郭明宇邓宇昊冯雅栋何子述陈竹梅胡瑞贤
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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