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Chinese Journal of Space Science ›› 2017, Vol. 37 ›› Issue (2): 214-221.doi: 10.11728/cjss2017.02.214

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Analysis of the changing regularity of 16-parameter GPS broadcast ephemeris improved parameters (in Chinese)

FENG Laiping1,3,4, CUI Xianqiang2, JIA Xiaolin3,4, RUAN Rengui1,3,4   

  1. 1. College of Geographic Space Information, Information Engineering University, Zhengzhou 450052;
    2. School of Geosciences and Info-Physics, Central South University, Changsha 410083;
    3. State Key Laboratory of Geo-information Engineering, Xi'an 710054;
    4. Xi'an Research Institute of Surveying and Mapping, Xi'an 710054
  • Received:2015-12-07 Revised:2016-06-06 Online:2017-03-15 Published:2017-03-02

Abstract:

A new 18-parameter GPS broadcast ephemeris improved on the basis of 16-parameter GPS are introduced in the GPS interface control document issued in 2004. But the improved reasons have not been analyzed. In this paper, the fitting algorithm of 16-parameter GPS broadcast ephemeris is briefly introduced, the differences of the two kinds of GPS broadcast ephemeris parameters are compared, and the change regularity and properties of the improved parameters are analyzed. Calculation results show that the improved parameters of 16-parameter GPS broadcast ephemeris have obvious periodic variation characteristics with a period of about 12 hours and 13.5 days, and the newly proposed 18-parameter GPS broadcast ephemeris can better approach the real orbit of GPS satellites.

Key words: Global positioning system, Broadcast ephemeris, Least square, Periodicity

CLC Number: