Journal of Astronautics ›› 2016, Vol. 37 ›› Issue (6): 704-710.doi: 10.3873/j.issn.1000-1328.2016.06.010

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A High Precision TOA Estimation Method for X Ray Pulsar Based Navigation System

LIN Qing qing, SHUAI Ping, HUANG Liang wei, ZHANG Xin yuan, BEI Xiao min   

  1. Qian Xuesen Laboratory of Space Technology, China Academy of Space Technology, Beijing 100094,China
  • Received:2015-06-17 Revised:2015-08-05 Online:2016-06-15 Published:2016-06-25

Abstract:

For the problem of pulse time-of-arrival (TOA) estimation of X-ray pulsar-based navigation (XPNAV) system, a high-precision TOA estimation method is proposed. The method is expected to have a higher performance in precision, which is the characteristic of the eigen-decomposition algorithms. A new measurement equation is built based on the cross correlation function between the folded pulse profile and the standard pulse profile. The measurement equation is eigen-decomposed to generate a couple of orthogonal eigenvectors. The TOA is then estimated via the orthogonality of the eigenvectors. Numerical simulation is done and the results testify the precision performance of the newly proposed method.

Key words: X-ray pulsar-based navigation (XPNAV), Time-of-arrival (TOA), Eigen-decomposition

CLC Number: