Application of Inter-system Hardware Delay Bias in GPS/GLONASS PPP
GPS applies Code Division Multiple Access technique in signal coding, while GLONASS’s signal is produced with Frequency Division Multiple Access technique. The differences in signal frequency results in inter-system hardware delay bias for GPS/GLONASS receivers. Subjecting to these hardware delays, strategies and models of GPS/GLONASS PPP based positioning needs to be modified. We derived a GPS/GLONASS combined PPP positioning models by introducing inter-system hardware delay biases. Several scenarios were simulated to test the introduced models using the observation of IGS stations. The results show that: ① Adding a couple of GLONASS satellites can improve the positioning accuracy in the environment without enough GPS satellites being tracked; ② The inter-system hardware delay bias is stable on daily base, and it could be predicted and be fixed in the GPS/GLONASS combined PPP.
KeywordsPrecise Point Position Receiver Clock Precise Point Position Carrier Phase Observation GLONASS Satellite
This research is supported by 100 Talents Programme of the Chinese Academy of Sciences. IGS community is acknowledged for providing Rinex data.
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