Research on Blunder Detection Methods of Pseudorange Observation in GNSS Observation Domain

Global Navigation Satellite System (GNSS) signal quality, type of receiver equipment, and external environment can cause GNSS observations to be anomalous, these anomalies are sometimes reflected in pseudorange rather than phase observations. To better detect blunders observations, this paper proposes three blunder detection methods under the same frequency different code types (case1), frequencies (case2), which Code Observation Difference Method (CODM), Inter-satellite (ICODM), Inter-epoch (IICODM). The corresponding thresholds for constructed test statistics were derived based on Bessel formula. Performance analysis was performed case1 C2 P2 observation data Positioning (GPS) at 137 Multi-GNSS Experiment (MGEX) stations, case2 BDS B1I B3I BeiDou (BDS) 232 MGEX 29 July 2022. results show that statistical information value significantly smaller case2. In first case, maximum values statistics, RMSE threshold mean 0.526, 0.752 2.243 m, respectively, while 7.066, 4.490 13.480 m respectively. reason is quality global GPS higher differential equation eliminates or weakens more errors with Under conditions, compared ICODM IICODM, CODM has high computational efficiency a simple mathematical model. It recommended use domain. According 3 times as limit, it set 5 15 BDS, half existing reference value. Finally, proposed improve positioning performance through actual verification.