Abstract
The network real-time kinematic (RTK) technique uses continuously operating reference stations (CORS) within a geographic area to model the distance dependent errors, allowing users in the area to solve ambiguities. A key step in network RTK is to fix ambiguities between multiple reference stations. When a new satellite rises or when maintenance happens, many unknown parameters are involved in the mathematical model, and traditional methods take some time to estimate the integer ambiguities reliably. The purpose of this study is the single-epoch ambiguity resolution on small-scale CORS network with inter-station distance of around 50 km. A new differencing scheme is developed to explore the full potential of multi-frequency Global Navigation Satellite System (GNSS). In this scheme, a differencing operation is formed between satellites with the closest mapping functions. With the new differencing scheme, tropospheric error can be mostly neglected after the correction, as well as the double-differencing operation. Numerical tests based on two baselines of 49 km and 35 km show that the success rate of ambiguity resolution can reach more than 90%. The single-epoch ambiguity resolution for reference stations brings many benefits to the network RTK service, for example, the instantaneous recovery after maintenance or when a new satellite rises.
Highlights
Weiping Jiang and Zhansheng LiuNetwork real-time kinematic (RTK) uses a number of continuously operating reference stations (CORS) in a large area to model the distance-dependent errors due to satellite orbit, clock, ionosphere, and troposphere [1,2,3]
The distance-dependent errors can be modelled when the integer ambiguities can be fixed, and the ambiguity resolution between reference stations is a key step in the whole data processing chain [4,5]
The speed of integer ambiguity resolution between static reference stations can be improved with better understanding of these errors, and the singleepoch ambiguity resolution is the ultimate goal
Summary
Weiping Jiang and Zhansheng Liu. Network real-time kinematic (RTK) uses a number of continuously operating reference stations (CORS) in a large area to model the distance-dependent errors due to satellite orbit, clock, ionosphere, and troposphere [1,2,3]. The distance-dependent errors can be modelled when the integer ambiguities can be fixed, and the ambiguity resolution between reference stations is a key step in the whole data processing chain [4,5]. When a new satellite rises or when maintenance happens, the orbital and propagation errors lead to difficulties in resolving integer ambiguities in observations instantaneously. The single epoch ambiguity resolution between reference stations brings great benefits after maintenance or breakdown, or in case of cycle slip, which happens frequently in low- or high-latitude areas during ionospheric scintillations
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