Multipath effect mitigating method for highprecision GNSS positioning based on reference station network

Long-term investigation is made on the sidereal dayrepetition characteristic of the multipath effect,which shows that historical data from the reference station network can be used to accelerate the initialization process of the network resolution,by mitigating the multipath effect(especially for the newrisen and low-elevation satellites) of the baselines within the network.Meanwhile a SNR-based interpolation model(SNRIM) is developed to calculate the precise real-time multipath corrections for RTK rover,based on the strong-correlative relationship between the multipath effect and signal-to-noise ratio(SNR). Finally the above technique for multipath mitigation is verified to be feasible and reliable in reference station network based real-time kinematic differential GPS positioning by experimental data acquired from the SGRSN(Sichuan GPS Reference Station Network)