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![]() (2) The high precision local area differential service, in which densely distributed monitoring stations and high capacity communications are required for model construction and parameters broadcast. The BDS Satellite Based Augmentation Service (BDSBAS) is currently undergoing testing and may open soon (Li et al. 2014), is widely used in precision approaches of civil aviation because of its high integrity (Yu et al. 2015), and the System for Differential Corrections and Monitoring (SDCM) of Russia (Lu et al. 2017), the European Geostationary Navigation Overlay Service (EGNOS) of Europe (Ventura-Traveset et al. The evolution of the differential service can be divided into three phases: (1) the pseudo range wide area differential service, which is based on widely and sparsely distributed ground stations, such as the Wide Area Augmentation System (WAAS) of the United States (Yang et al. In addition to the upgrade of the fundamental service, the augmentation service, which uses the differential method, has effectively improved the performance of GNSS positioning, navigation, and has also produced great social benefits (Li et al. But precise orbit determination of GEO satellites remains to be a challenge. The radial accuracy of the broadcast orbit can reach 10 cm, as evaluated by the satellite laser ranging (SLR) method, and the signal-in-space user range error (SISURE) is better than 0.5 m (Yang et al. The latest research results show that the precision of the BDS satellite’s orbit has been tremendously improved with the addition of an inter-satellite link (Yang et al. ![]() 2019a, b) for the BDS-3 (fundamental service, the satellite-based augmentation service, precise point positioning service, short message communication service and search and rescue service) will be available in 2020.Īs the BDS space segment has continuously improved, its superior service performance has been gradually highlighted and had drawn worldwide attention (Wang et al. In addition, all the services designed (Yang et al. And the final GEO will be launched in June, 2020. Soon after, the 54th BDS satellite was launched into orbit on March 9, 2020. 2019a, b) and was completed after four satellites joined the system on December 17, 2019. ![]() The core constellation of the BDS-3 consists of 24 MEO satellites (Yang et al. The BDS space segment is a hybrid constellation of GEO, Inclined Geosynchronous Satellite Orbit (IGSO) and Medium Earth Orbit (MEO) satellites. The positioning performance within 1800 km could reach 0.24 m and 0.38 m for the horizontal and vertical components, respectively. Furthermore, the effective range is increased. Under normal circumstances, the horizontal and vertical positioning accuracy of users within 1000 km from the center of the zone can reach 0.19 m and 0.34 m. The results show that orbit errors can be stabilized using orbit fluctuation corrections, and the positioning precision and stability of the BDS WADS can be improved simultaneously. In this paper, we proposed an algorithm to weaken the influence of GEO satellite orbit error fluctuations and verified the method using data from eight sparsely distributed zones. These fluctuations not only decrease the accuracy and stability of zone correction service provided by BDS WADS, but also shorten its effective range. However, the fluctuations in Geostationary Earth Orbit (GEO) satellite orbit errors reduce the spatial correlation of orbit errors. ![]() Decimeter-level service is provided by the BeiDou satellite navigation system wide area differential service (BDS WADS) for users who collect carrier phase measurements. ![]()
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