Multi-global navigation satellite system(GNSS)ultra-rapid precise orbit determination provides high-precision space reference for GNSS real-time applications.The multi-GNSS ultra-rapid precise orbit determination at space-ground collaborative positioning,navigation and timing(PNT)network service center is implemented and the accuracy of the orbit determination results are evaluated.The conceptual essence of the space-ground collaborative PNT network,and the ar-chitecture and detailed functions of the ultra-rapid precise orbit determination software deployed on the network service center are introduced.Additionally,a two-thread sliding window ultra-rapid orbit determination strategy is proposed to meet real-time application requirements.Finally,the accuracy of the orbit determination results is evaluated in three ways:through overlapping orbit comparison,comparison with other precise orbit products,and satellite laser ranging(SLR)chec-king.The results show that the root mean square(RMS)error of multi-GNSS medium-Earth or-biting(MEO)satellites in the radial direction ranges between 2 and 5 cm during a 6-hour predicted arc,and the minimum one-dimensional RMS error of the BDS2 IGSO satellite is at the level of 10～15 cm,when compared with the final orbit products from the analysis center of Wuhan University.The mean value and standard deviation of SLR residuals for the GPS and Galileo satellites are at 1～3 cm and 3～6 cm,respectively.The results meet the accuracy requirements of the space refer-ence for centimeter-level real-time applications.
维普
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