Key Techniques of GNSS Ground-Based Augmentation System and Location Based Cloud Service

To accomplish a GNSS (global navigation satellite system) ground-based augmentation system, a high-precision location based service (LBS) platform using augmentation reference station network (ARSNet) was developed independently. The ARSNet was tested in comparison with the international representative LBS platform, showing that its initial time and precision of network real-time kinematic (RTK) positioning are at the same level as the international platform; i.e., centimeter-level RTK positioning can be achieved in the both LBS platforms. Experimental results of data processing by combination use of Beidou system (BDS) and global positioning system (GPS) indicate that the precision of the BDS/GPS combined solution is about 1 mm in the X-and Z-directions, and 2 mm in the Y-direction for the 57 baselines tested. Compared to the BDS-only and GPS-only solutions, the BDS/GPS combined processing strategy can improve the precision in 55 baselines and 53 baselines respectively, namely 96.5% and 93.0% of the total baselines. In addition, key issues of multi-mode GNSS data fusion, processing, and location service in large-scale CORS network are studied. A location cloud service, with location-independent service and resource pool, is proposed to share capabilities of data processing and analyzing, and provide diversity services and wide area seamless positioning. The proposed techniques provide a new theoretical basis to obtain, share, process and analyze information for wide area distributed CORS network.