基于脉冲星信号的自适应同步采样方法  

Adaptive synchronized sampling method based on pulsar signal

作　　者：唐思豪 姚文轩[1] 邱伟[1] 郑瑶 Tang Sihao;Yao Wenxuan;Qiu Wei;Zheng Yao(College of Electrical and Information Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]湖南大学电气与信息工程学院,长沙410082

出　　处：《仪器仪表学报》2021年第10期121-128,共8页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金(52177078)项目资助。

摘　　要：基于传统GPS/北斗信号的广域同步测量技术易受到恶意网络攻击,可靠性难以得到保障。为解决这一问题,本文利用脉冲星信号周期脉冲精度高、免疫于现有网络攻击的特性,提出一种新型自适应同步采样方法:首先对射电望远镜接收到的脉冲星信号进行多相滤波、消色散和周期折叠处理,得到脉冲轮廓;然后采用最小二乘法监测本地晶体振荡器频率,动态调整定时控制间隔实现自适应同步采样。为验证算法的有效性,本文采用脉冲星J0437-4715的观测数据生成同步信号,实现电网信号的同步测量,利用递归离散傅里叶变换算法计算采样数据的相角和频率,得到相角和频率平均测量误差分别为-9.75×10^(-5°)和9.83×10^(-7)Hz,验证了所提自适应同步采样方法的有效性。The traditional wide-area synchronous measurement technology based on GPS/Beidou is vulnerable to hostile cyber-attacks,and its reliability is difficult to guarantee.In order to solve this problem,this paper utilizes the pulsar signal high accuracy characteristics of periodic pulse and immunity to existing cyber-attacks to establish a new adaptive synchronous sampling method.Firstly,polyphase filtering,de-dispersion and period folding are performed on the pulsar signal received by the radio telescope to obtain pulse profile.Then,the local crystal oscillator frequency is monitored with the least square method,and the time control interval is dynamically adjusted and controlled to realize adaptive synchronized sampling.To verify the effectiveness of the algorithm,this paper uses the observation data of the pulsar J0437-4715 to generate synchronization signals and realize the synchronized measurement of the power grid signal.The recursive discrete Fourier transform algorithm is applied to calculate the phase angle and frequency of the sampling data,and the obtained average errors of phase angle and frequency are-9.75×10^(-5°)and 9.83×10^(-7)Hz,respectively,which verifies the effectiveness of the proposed adaptive synchronized sampling method.

关 键 词：脉冲星 自适应采样 晶振频率漂移 广域电网 同步测量 同步信号 

分 类 号：TM930.115[电气工程—电力电子与电力传动] TH89[机械工程—仪器科学与技术]