一种利用三阶互小波累积量的脉冲星累积脉冲轮廓时间延迟测量算法  

Time Delay Measurement Based on 3rd-order Cross Wavelet-Cumulants for Pulsar Integrated Pulse Profile

作　　者：苏哲[1] 许录平[1] 刘勍[1] 王勇[1] 

机构地区：[1]西安电子科技大学电子工程学院,西安市太白南路2号710071

出　　处：《武汉大学学报（信息科学版）》2011年第1期14-17,共4页Geomatics and Information Science of Wuhan University

基　　金：国家863计划资助项目(2007AA12Z323);国家自然科学基金资助项目(60772139);中国科学院精密导航定位与定时技术重点实验室开放研究基金资助项目(2009PNTT09)

摘　　要：针对运动航天器收到的脉冲星信号受Doppler效应影响,难以准确测量脉冲到达时间的问题,提出了基于三阶小波互累积量的脉冲星累积脉冲轮廓时间延迟测量算法。结果表明,当信号受到Doppler效应影响时,该算法测量精度优于现有算法,适用于脉冲星导航系统中脉冲到达时间的测量。The X-ray pulsar signal received by moving spacecraft is distorted by Doppler effect,which leads to the low accuracy in pulse arrival time measurement.In order to improve the measurement precision,the pulsar integrated pulse profile time delay measurement algorithm based on 3rd-order cross wavelet-cumulants is proposed.Firstly,the time delay model of X-ray pulsar integrated pulse profile received by moving spacecraft is analyzed.Then,this algorithm estimates the time delay through the peak position of 3rd-order cross wavelet-cumulants of pulsar standard profile and integrated pulse profile.Finally,time delay measurement experiment is processed with different signal-to-noise ratios and types of pulsars.The results show that this algorithm performs better than former algorithms when the received pulsar signal is Doppler-distorted,and is suitable for the arrival time measurement in moving spacecraft.

关 键 词：X射线脉冲星导航 累积脉冲轮廓时间延迟 Doppler效应 三阶互小波累积量 

分 类 号：P228.41[天文地球—大地测量学与测量工程]