中国空间科学技术 ›› 2018, Vol. 38 ›› Issue (1): 1-7.doi: 10.16708/j.cnki.1000-758X.2018.0001

• 研究探讨 •    下一篇

基于X射线脉冲星导航试验卫星观测数据的到达时间估计

  林晴晴1,2,*, 帅平1,2, 黄良伟1,2, 张新源1,2, 陈绍龙1,2, 吴耀军1,2, 贝晓敏1,2, 蒙静1,2, 陈强1,2, 张倩1,2, 张恒彬1,2   

  1. 1. 钱学森空间技术实验室,北京  100094
    2. 中国空间技术研究院,北京  100094
  • 收稿日期:2017-04-28 接受日期:2018-01-15 出版日期:2018-02-25 发布日期:2018-02-25
  • 通讯作者: 林晴晴(1987-),女,工程师,linqingqing@qxslab.cn,研究方向为脉冲星导航技术、阵列信号处理
  • 基金资助:
    国家自然科学基金(61403391,61601463,11405265)

TOA estimation methods for the observation data based on the X-ray pulsar-based navigation-1 (XPNAV-1) satellite

Lin Qingqing1,2,*, SHUAI Ping1,2, HUANG Liangwei1,2, ZHANG Xinyuan1,2, CHEN Shaolong1,2, WU Yaojun1,2, BEI Xiaomin1,2, MENG Jing1,2, CHEN qiang1,2, ZHANG qian1,2, ZHANG Hengbin1,2   

  1. 1. Qian Xuesen Laboratory of Space Technology, Beijing 100094, China
    2. China Academy of Space Technology, Beijing 100094, China
  • Received:2017-04-28 Accepted:2018-01-15 Online:2018-02-25 Published:2018-02-25

摘要: 中国首颗X射线脉冲星导航试验卫星(X-ray Pulsar Navigation-1, XPNAV-1)搭载了两种体制的X射线探测器,其主要任务是在轨开展X射线脉冲星的探测以及进行脉冲星导航体制的验证。为了实现到达时间(Time of Arrival,TOA)的高精度估计,提出了利用阵列信号处理领域的多重信号子空间分类(Multiple Signal Classification,MUSIC)方法进行脉冲星导航的TOA估计,进行了试验仿真验证,并且对XPNAV-1观测到的蟹状星云(Crab)脉冲星的光子数据进行处理。在观测时间为协调世界时(Coordinate Universal Time,UTC)57727.0约简儒略日(Modified Julian Day,MJD)到UTC57812.0MJD内,选取了0.5~10keV频段内的121段光子观测数据,对这些数据进行了脉冲轮廓折叠,得到了Crab脉冲星的折叠轮廓,然后分别利用互相关法和MUSIC方法进行折叠轮廓的TOA估计,最后对比了两种方法的估计结果。

关键词: 脉冲星, X射线脉冲星导航试验卫星, 蟹状星云, 轮廓折叠, 到达时间估计

Abstract: The first X-ray Pulsar-based Navigation-1 (XPNAV-1) satellite of China operates two X-ray instruments. The purpose of the XPNAV-1 mission is to detect the X-ray pulsars′ radiation photons and validate the pulsar navigation method. To acquire high precision pulse time of arrival (TOA) estimation, a novel method based on the multiple signal classification (MUSIC) algorithm was proposed, then numerical simulation was done for the novel method. The data from coordinate universaltime (UTC) 57727.0 MJD (modified Julian day) to UTC 57812.0 MJD of Crab pulsar observed by XPNAV-1 satellite was analyzed. Firstly, 121 pieces of the observations in the 0.5~10keV energy band were refined using epoch folding method. Secondly, the TOA of the epoch folding profiles was estimated by cross correlation method and MUSIC method. Finally, the estimations of the two methods were analyzed.

Key words: pular, XPNAV-1, Crab, epoch folding, time-of-arrival (TOA) estimation