Abstract
Research on the orbit accuracy variation characteristics of Beidou navigation satellite can help to discover the deficiency of yaw-attitude modeling during eclipse season, which may further contribute to refine the functional models in precise orbit determination (POD). In this article, the broadcast orbit accuracy of Beidou Navigation Satellite System was evaluated firstly by Satellite Laser Ranging (SLR) residuals ranging from Jan 2015 to Nov 2016. For BDS GEO satellites, the orbit accuracy evaluated by SLR residuals is 0.6 m around with a systematic bias of about −0.6 m. The orbit accuracy of BDS IGSO and MEO satellites is about 0.5 m whereas the orbit quality would significantly reduced to 1.0–1.4 m level when the yaw-attitude mode switch happens. Based on the results above, this article also analyzed the broadcast orbit accuracy of BDS IGSO-6 satellite which was launched in March 2016 and adopt a modified yaw-attitude mode during its eclipse season, and found that the orbit accuracy of BDS IGSO-6 satellite is better than 0.25 m, no obvious orbit accuracy decrease can be observed, which is inconsistent with that of previous IGSO satellites. However, the performances of precise orbit product released by GFZ and iGMAS were still degraded during theoretical yaw maneuver periods. Finally, a POD experiment was carried out to analysis the orbit quality performance of BDS IGSO-6 satellite. The preliminary results show that benefiting from the modified yaw-attitude mode during its eclipse season, the orbit quality of BDS IGSO-6 satellite has high accuracy and stability, and special attention is needed in POD processing.
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Acknowledgements
The IGS MGEX and ILRS are greatly acknowledged for providing the multi-GNSS and SLR tracking data. We would also like to thank WHU, NTSC and iGMAS project for providing GNSS data and precise orbit products.
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Ji, G., Liu, Y., Yang, Z., Jia, X. (2017). A Study on the Orbit Accuracy Variation Characteristics and Yaw-Attitude Modes of Beidou Navigation Satellites. In: Sun, J., Liu, J., Yang, Y., Fan, S., Yu, W. (eds) China Satellite Navigation Conference (CSNC) 2017 Proceedings: Volume III. CSNC 2017. Lecture Notes in Electrical Engineering, vol 439. Springer, Singapore. https://doi.org/10.1007/978-981-10-4594-3_7
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DOI: https://doi.org/10.1007/978-981-10-4594-3_7
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