Time transfer using p-code measurements from gps/glonass receivers

摘要

Time and frequency transfer using the GLONASS P-Code from geodetic receivers is investigated. Our results are based on data sets collected by combined GPS/GLONASS receivers driven by a hydrogen maser, and involved in the IGEX campaign. A first comparison is performed between the results obtained from the data collected by different types of receivers (R100 from 3S-Navigation or Z18 from Ashtech). the improvement of the technique related to the use of precise GLONASS ephemerides, computed within the frame of the IGEX campaign, rather than the broadcast ephemerides, is also investigated. When correcting the resutls for the receiver hardware delays, which are diffeent for each satellite, the final precision of the time transfer is about 10 nanoseconds (ns) (peak to peak). Finally, the use of the GLONASS P-code is compared with the frequency transfer using GPS code and carrier phase measurements.