Acta Geodaetica et Cartographica Sinica >

2016 , Vol. 45 >Issue 10: 1165 - 1170

DOI: https://doi.org/10.11947/j.AGCS.2016.20160126

The Impact of Yaw Attitude of Eclipsing GPS/BDS Satellites on Phase Wind-up Solutions for PPP and Its Correction Model

  • FAN Caoming ,
  • WANG Shengli ,
  • OU Jikun
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  • 1. College of Geomatics, Shandong University of Science and Technology, Qingdao 266590, China;
    2. Institute of Ocean Engineering, Shandong University of Science and Technology, Qingdao 266590, China;
    3. State Key Laboratory of Dynamic Geodesy, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China;
    4. Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China

Received date: 2016-03-28

  Revised date: 2016-07-27

  Online published: 2016-11-08

Supported by

The National Natural Science Foundation of China(No.41574015);Open Foundation of State Key Laboratory of Geodesy and Earth's Dynamics (No.SKLGED 2015-3-1-E);Open Foundation of Key Laboratory of Precision Navigation and Timing Technology,National Time Service Center CAS(No.2014PNTT06)

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Abstract

Care of the phase wind-up correction should be reasonably taken in precise point positioning. In practice, correct computation of phase wind-up relies mainly upon the information about the satellite attitude, which should be modeled differently when satellites undergo eclipsing. Different GPS satellite types would be subject to different eclipsing periods. For instance, GPS ⅡR satellites can experience noon and midnight turn maneuvers, GPS ⅡF satellites suffer from noon maneuver and shadow crossing, and GPS Ⅱ/ⅡA satellites may further experience post-shadow recovery periods when compared to ⅡF ones. As for the BDS non-GEO satellites, one should take into account the attitude control switching between the nominal and the orbit-normal mode. This paper presents a model enabling the attitude to be correctly computed for both eclipsing as well as non-eclipsing satellites. Numerical tests using real data are then performed in order to verify our model presented. As far as the filtered residuals are concerned, it is found that, their maximum residual could exceed 20 cm during the eclipsing periods. This problem is fortunately solvable when use of our model has been made, since the residuals reduce to below 5 cm. It should be noted that, our numerical results may be slightly different when we use precise satellite orbit and clock products delivered by different Analysis Centers. Furthermore, the shadow crossing period takes typically up to 1 hour for GPS Ⅱ/ⅡA satellites, during which the yaw attitude is controlled entirely by the positive yaw bias (Ⅱ/ⅡA of0.5°). The Ⅱ/ⅡA post-shadow recovery periods, covering about 30 minutes, still cannot be fully modeled; the data collected within this period should thereby be excluded.

Key words： precise point positioning; phase wind-up; satellite attitude model

Cite this article

FAN Caoming , WANG Shengli , OU Jikun . The Impact of Yaw Attitude of Eclipsing GPS/BDS Satellites on Phase Wind-up Solutions for PPP and Its Correction Model[J]. Acta Geodaetica et Cartographica Sinica, 2016 , 45(10) : 1165 -1170 . DOI: 10.11947/j.AGCS.2016.20160126

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