Calibrate inter-channel bias in GLONASS/BDS combined pseudorange positioning

Because of the frequency difference between GLONASS satellites, the hardware bias of the station cannot be absorbed by the receiver clock bias parameter. We presents a method to estimate a inter-channal bias for each satellites to improve the accuracy of combined GLONASS/BDS pseudorange standard point positioning. The solutions show that adding pseudorange ICB calibration can effectively reduce GLONASS positioning error, and the root mean square (RMS) value of east(E), north(N), and up (U) components error after calibration is reduced by 0.43 m, 0.69 m, 0.73 m, respectively, and the calibration effect is long-term effective. When the BeiDou Navigation Satellite System (BDS) observation conditions of the station is limited, the combined GLONASS/BDS pseudorange standard point positioning is effective in improve accuracy positioning. After calibrating inter-channal bias, dual-system positioning accuracy is further improved. And the RMS values of E, N, U components error are reduced by 0.37 m, 0.28 m, and 0.5 m, respectively.