Abstract
Since 2014, China has embarked on the process of building its own national continuously operating reference system (CORS), called the ground-based augmentation system (GAS), as one of the seven planning services of the BeiDou global navigation satellite system (BDS-3). The performance specifications for GAS were released, and the system has begun to render open services formally in May 2021. This paper involves a comprehensive introduction to GAS, from the aspects of its system composition, reference time system, and coordinate reference frame. The performance specifications and service products of GAS are presented and discussed. Performance tests of GAS services including wide-area and regional real-time augmentation positioning service and postprocessing data service were been carried out. The results show that wide-area real-time augmentation positioning service can realize meter-level to decimeter-level positioning for pseudo-range and carrier-phase positioning, respectively, while for regional real-time service, it can provide centimeter-level positioning within seconds, for postprocessing data service, it can realize millimeter-level positioning in mainland China. Overall, the performance test results of GAS service show that the service performance can well meet the design requirements and indicate the broad application prospects of GAS in the future.
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Data Availability Statement
The data and models that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This work was supported in part by the National Natural Science Foundation of China (Grant Nos. 42074044 and 41974041) and in part by the China Association for Science and Technology (Grant No. 2019QNRC001).
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Published In
Journal of Surveying Engineering
Volume 149 • Issue 3 • August 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Sep 20, 2022
Accepted: Jan 31, 2023
Published online: Apr 24, 2023
Published in print: Aug 1, 2023
Discussion open until: Sep 24, 2023
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