A Broadband Beamforming Method Based on Frequency Constraint with Generalized Sidelobe Cancellation

A technology of frequency constraint and sidelobe cancellation, applied in the field of radar communication, it can solve the problems of high requirement of data snapshots and poor output stability, and achieve the effect of improving practicability, reducing the amount of calculation and high performance.

Active Publication Date: 2021-12-03
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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  • A Broadband Beamforming Method Based on Frequency Constraint with Generalized Sidelobe Cancellation
  • A Broadband Beamforming Method Based on Frequency Constraint with Generalized Sidelobe Cancellation
  • A Broadband Beamforming Method Based on Frequency Constraint with Generalized Sidelobe Cancellation

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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 RF signal to a baseband signal. The signal received by the antenna is generally a carrier-processed RF signal. If the original signal is to be processed, it needs to be de-carrier 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 an analog signal into a digital sign...

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Abstract

The present invention provides a frequency-constrained generalized sidelobe cancellation wide-band beamforming method. By performing a new constraint on the weight vectors of the main and auxiliary channels of the GSC structure in the frequency domain, the interference can be suppressed while the desired signal has no Distortion passes. By controlling the number of array elements of the main and auxiliary channels, the performance of the algorithm can be flexibly changed, and the calculation amount of the algorithm can be reduced without wasting degrees of freedom, thereby improving the practicability of the algorithm. The present invention directly constrains the auxiliary channel weight vector through the constraint matrix, and the constraint matrix will change with the target signal and array, so the obtained auxiliary channel weight vector is the most suitable for the current environment, which also guarantees the high performance of the algorithm premise. The present invention applies the idea of ​​frequency domain constraint to the broad-band beamforming method without pre-delay and generalized sidelobe cancellation, which has low calculation cost and can suppress interference and noise signals 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 technique, 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 wideband beamforming algorithm based on this structure has 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 applicat...

Claims

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Application Information

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Patent Type & Authority Patents(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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