Precise Orbit Determination of BeiDou Regional Navigation Satellite System Via Double-Difference Observations
The precise orbit determination (POD) for BeiDou satellites mainly relies on a regional tracking network distributed in China area at the present time. The multi-satellite POD for BeiDou regional navigation satellite system via double-difference observati
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Precise Orbit Determination of BeiDou Regional Navigation Satellite System Via Double-Difference Observations Jun Zhu, Jiasong Wang, Guang Zeng, Jie Li and Junshou Chen
Abstract The precise orbit determination (POD) for BeiDou satellites mainly relies on a regional tracking network distributed in China area at the present time. The multi-satellite POD for BeiDou regional navigation satellite system via double-difference observations is presented. First, the double-difference phase measurements are modeled on ionosphere-free combination of B1 and B2 signals. The POD strategies are detailed, followed by a brief data-processing flow. Then, the POD tests based on regional network of domestic monitoring stations are developed, and the orbit quality assessed by arc overlaps and Satellite Laser Ranging (SLR) residuals shows an accuracy of about 20 cm in radial direction. Finally, contributions of the overseas monitoring stations to the POD accuracy of BeiDou satellites are investigated by introducing several IGS Multi-GNSS Experiment (IGS M-GEX) monitoring stations with BeiDou tracking capability into the multi-satellite POD test. The improved orbit accuracy indicates that more BeiDou observing sites should be established worldwide in future.
Keywords Precise orbit determination (POD) BeiDou regional navigation satellite system Double-difference observation Multi-GNSS experiment (M-GEX)
Foundation item: National Natural Science Foundation of China (41274018). J. Zhu (&) J. Wang State Key Laboratory of Astronautic Dynamics, Xian 710043, China e-mail: [email protected] J. Zhu J. Wang G. Zeng J. Li J. Chen Xi’an Satellite Control Center, Xian 710043, China
J. Sun et al. (eds.), China Satellite Navigation Conference (CSNC) 2013 Proceedings, Lecture Notes in Electrical Engineering 245, DOI: 10.1007/978-3-642-37407-4_7, Ó Springer-Verlag Berlin Heidelberg 2013
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7.1 Introduction The Compass/Beidou Navigation Satellite System is a global navigation satellite system (GNSS), which is independently developed, deployed, and operated by China. This system is still in progress, and is designed to provide global coverage around 2020. At present, only the Beidou regional navigation satellite system has been built up, which can provide coverage in the Asia–Pacific region with Positioning, Navigation, Timing (PNT), and short-message communication service capabilities [1, 2]. The PNT performance of GNSS is directly related to the satellite orbit accuracy. The precise orbit determination (POD) for BeiDou satellites can reach a radial accuracy of decimeter level currently, which is limited in tracking hour and geometric strength of regional configuration of ground-tracks observing in China area [3–5]. The POD performance can be improved by adopting some appropriate data processing techniques, such as differenced data processing. Differences of the original observations allow to eliminate or to reduce some biases, such as clock offset of satellites and receivers. The single-difference is simply d
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