Chinese Space Science and Technology ›› 2018, Vol. 38 ›› Issue (1): 1-7.doi: 10.16708/j.cnki.1000-758X.2018.0001

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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

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