Influence of the GEO satellite orbit error fluctuation correction on the BDS WADS zone correction

Binghao Wang,Hui Zhang,Dianwei Cong,Jianhua Zhou,Bin Wang

doi:10.1186/s43020-020-00020-0

Binghao Wang, Hui Zhang + Show 3 more

Open Access

https://doi.org/10.1186/s43020-020-00020-0

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Journal: Satellite Navigation	Publication Date: Jun 8, 2020
Citations: 7	License type: open-access

Affiliation: PLA Information Engineering University

Abstract

Decimeter-level service is provided by the BeiDou satellite navigation system wide area differential service (BDS WADS) for users who collect carrier phase measurements. However, the fluctuations in Geostationary Earth Orbit (GEO) satellite orbit errors reduce the spatial correlation of orbit errors. These fluctuations not only decrease the accuracy and stability of zone correction service provided by BDS WADS, but also shorten its effective range. 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. 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. 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. Furthermore, the effective range is increased. The positioning performance within 1800 km could reach 0.24 m and 0.38 m for the horizontal and vertical components, respectively.

Highlights

The BDS space segment is a hybrid constellation of Geostationary Earth Orbit (GEO), Inclined Geosynchronous Satellite Orbit (IGSO) and Medium Earth Orbit (MEO) satellites
The core constellation of the BDS-3 consists of 24 MEO satellites (Yang et al 2019a, b) and was completed after four satellites joined the system on December 17, 2019
If the test area is divided by 1° × 0.5° and grid points are set to be virtual users, the standard deviation (STD) values of delorb between the virtual users and the reference point are calculated based on the original and corrected GEO errors

Summary

Introduction

The BDS space segment is a hybrid constellation of GEO, Inclined Geosynchronous Satellite Orbit (IGSO) and Medium Earth Orbit (MEO) satellites. Fundamental of zone correction enhancing positioning is based on the spatial correlations of orbit error, atmosphere delay and other error sources between the user and reference stations (Zhang 2017). They are broadcasted over a 36-s period for users in the service zone to eliminate errors in carrier phase measurements for quicker convergence and higher precision positioning.

Results

Conclusion