一种时域频域综合处理消除射电干扰的方法  

A method for eliminating radio frequency interference by synthetic processing in frequency domain and time domain

作　　者：闫世钊 王性川 赵成仕[1,3] 李祎丰 罗近涛 YAN Shi-zhao;WANG Xing-chuan;ZHAO Cheng-shi;LI Yi-feng;LUO Jin-tao(National Time Service Center,Chinese Academy of Sciences,Xi’an 710600,China;University of Chinese Academy of Sciences,Beijing 100049;Key Laboratory of Time Reference and Applications,Chinese Academy of Sciences,Xi’an 710600,China)

机构地区：[1]中国科学院国家授时中心,西安710600 [2]中国科学院大学,北京100049 [3]时间基准及应用重点实验室(中国科学院),西安710600

出　　处：《时间频率学报》2023年第4期320-332,共13页Journal of Time and Frequency

基　　金：国家自然科学基金资助项目(11873050,11973046);中国科学院“西部之光”人才培养计划“西部青年学者”资助项目(XAB2021YN27)。

摘　　要：针对时域和频域无线电干扰的不同特征,提出了一种时域频域综合处理的消除脉冲星观测数据中射电干扰的方法。利用中国科学院国家授时中心昊平40 m射电望远镜观测的脉冲星计时数据和单个脉冲观测数据,对比分析了该方法与PSRCHIVE自动消干扰方法的效果。对计时观测数据消干扰结果表明,当阈值k=0.4时消干扰处理后信噪比达到最大,约为25.8,比原始数据信噪比提高大约3.8倍,比PSRCHIVE自动消干扰方法处理效果提高大约3.3倍。对单个脉冲数据消干扰结果表明,消干扰处理后信噪比比处理前信噪比提高大约5.8倍,比PSRCHIVE自动消干扰算法处理后信噪比提高约1.8倍。实验结果表明时域频域综合处理消除射电干扰的方法能够很好地消除无线电干扰信号对脉冲星观测数据的影响、提高脉冲星数据的信噪比、在一定程度上缓解了阈值选取带来的困难。According to the different characteristics of the radio interference in time domain and frequency domain,a method of eliminating the radio interference in the pulsar observation data is proposed based on time domain and frequency domain processing.The results of this proposed method and the PSRCHIVE automatic interference mitigation method are compared and analyzed using the timing observation data and single pulse observation data taken with the 40-meter radio telescope at the Hao-ping Observatory of the National Time Service Center,Chinese Academy of Sciences.When the threshold k=0.4,the signal to noise ratio reaches the maximum of 25.8,which is about 3.8 times higher than the original data and 3.3 times higher than the PSRCHIVE automatic noise elimination method.The results of single pulse data radio frequency interference elimination show that the signal to noise ratio after eliminating radio frequency interference is about 5.8 times higher than that before,and 1.8 times higher than that after using PSRCHIVE’s automatic radio frequency interference remove algorithm.Experimental results show that this method can eliminate the influence of radio frequency interference on pulsar observation data,and improve the signal to noise ratio of pulsar data,and alleviate the difficulty of threshold selection to a certain extent.

关 键 词：脉冲星 无线电干扰 数据分析 信噪比 

分 类 号：TN97[电子电信—信号与信息处理]