Centimeter-Level Carrier Phase Positioning with Asynchronous Ground-Based Positioning Systems

Xinchen Zhang, Tengfei Wang, Zheng Yao, Mingquan Lu, Yi Wang, Cheng Li

Abstract: Ground-based positioning systems can be an alternative or a booster for the Global Navigation Satellite System. Groundbased positioning systems with synchronized clocks can obtain centimeter-level positioning accuracy using carrier phase measurements. But, clock synchronization can be time-consuming or sometimes even impossible. Asynchronous positioning systems take less time for deployment but suffer accuracy loss because of asynchronous clocks. A new framework is proposed to improve the positioning accuracy for asynchronous ground-based positioning systems. This framework introduces a static reference station with no requirement for knowing its position. The reference station estimates differenced clock drifts between the asynchronous pseudolite base stations and transmits the results to the user receiver. The receiver utilizes carrier phase measurements and the estimations from the reference station to acquire positioning results via an Extended Kalman Filter (EKF). Simulation shows that root-mean-square error(RMSE) for 2-D positioning can reach the centimeter level. A field experiment using an asynchronous pseudolite system is also conducted. The horizontal RMSE for the experiment is 7.97 cm. The field experiment shows the viability of the framework.
Published in: Proceedings of the 36th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2023)
September 11 - 15, 2023
Hyatt Regency Denver
Denver, Colorado
Pages: 2395 - 2403
Cite this article: Zhang, Xinchen, Wang, Tengfei, Yao, Zheng, Lu, Mingquan, Wang, Yi, Li, Cheng, "Centimeter-Level Carrier Phase Positioning with Asynchronous Ground-Based Positioning Systems," Proceedings of the 36th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2023), Denver, Colorado, September 2023, pp. 2395-2403. https://doi.org/10.33012/2023.19244
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