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基于奇异值优化分割的射频干扰消除方法

Method for RFI mitigation Based on Optimal Segmentation of Singular Value
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摘要 为消除射频(RFI)干扰并减少天文信号损失,提出基于奇异值优化分割的射频干扰消除方法。该方法首先对射电观测信号进行子带分解,构造观测信号矩阵;再对矩阵进行奇异值分解(SVD),寻找干扰信号对应的奇异值,并根据输出信噪比最大的原则对该奇异值进行优化分割,得到最优分割比和优化后的奇异值分量;最后去除RFI信号。仿真实验结果表明,该方法针对同一射电源在不同时间段的射电观测信号得到的最优分割比k N=5/20具有通用性,利用最优分割比进行RFI信号抑制后的输出信噪比增益明显,可达到1.2~1.4,能够有效抑制RFI信号,减少天文信号损失,并获得最大输出信噪比。所提方法为消除射频干扰提供了新的思路。 In order to eliminate radio frequency interference(RFI)and reduce the loss of astronomical signal,a radio frequency interference elimination method based on singular value optimization segmentation is proposed. Firstly,the radio observation signal is decomposed into subbands to construct the observation signal matrix;Then singular value decomposition(SVD)is performed on the matrix to find the singular value corresponding to the interference signal,and the singular value is optimally segmented according to the principle of maximum output signalto-noise ratio to obtain the optimal segmentation ratio and the optimized singular value component;Finally,RFI signal is removed. The simulation and experimental results show that the optimal segmentation ratio K/N = 5/20 obtained by this method for the radio observation signals of the same radio source in different time periods is universal. The output signal-to-noise ratio gain after RFI signal suppression using the optimal segmentation ratio is obvious,which can reach 1.2 ~ 1.4. It can effectively suppress RFI signal,reduce astronomical signal loss,and obtain the maximum output signal-to-noise ratio.The proposed method provides a new idea for eliminating radio frequency interference.
作者 洪迎盈 吴亚军 卜朝晖 杨珣 刘爻 王琪 HONG Ying-ying;WU Ya-jun;BU Zhao-hui;YANG Xun;LIU Yao;WANG Qi(Institute of Biomedical Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Radio Astronomy Technology Laboratory,Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030,China)
出处 《软件导刊》 2022年第9期69-75,共7页 Software Guide
基金 科技部平方公里阵列射电望远镜(SKA)专项课题(2020SKA0110103)。
关键词 射频干扰 干扰消除 奇异值分解 优化分割 radio frequency interference interference mitigation singular value decomposition optimal segmentation
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