Abstract:

In the compatible process of GPS and Beidou, if it uses two-system twofrequency receiver, the main factor influencing the ionospheric delay accuracy is the ionospheric parameter in each system’s ephemeris. Due to the difference of the two systems’ parameters, when it applies the same ionospheric delay model to acquire the ionospheric TEC, the final results will show somewhat differences. When taking the use of GPS/Beidou multimode receiver, it can obtain the ionospheric parameters in GPS and Beidou’s ephemerides to acquire delay TEC with the ionospheric model. Then the IGS ionospheric TEC in the same place and same time will be seen as the reference so that it can make contrast with GPS and Beidou’s ionospheric delay accuracy. In the experiment, the parameters in the two systems’ ephemerides show the significant differences so that once it use the same Klobuchar model, it will bring different TEC. When the TEC results from GPS and Beidou subtract IGS reference value, the final results show that the accuracy of GPS is higher than the Beidou’s.

Key words: Multi-mode receiver;ionosphere;TEC;IGS ionospheric grid