Results From Time Transfer Experiments Based on GLONASS P-Code Measurements from RINEX Files

摘要

The time transfer procedure presently used for the realization of TAI is based on the common view approach, using the CGGTTS data computed by an internal software of the time receivers. We choose here another approach and analyze the raw data available in the RINEX files produced by GPS/GLONASS geodetic receivers. We concentrate our analysis on the use of GLONASS P-code measurements. Because the frequency emitted by each GLONASS satellite is different, the measurements must be corrected for their frequency-dependent receiver hardware delays. These delays can be computed either from the CGGTTS files or directly from the raw P-code data. We show that the first approach is better than the second one. After this correction, time transfer (using the GLONASS P-codes) is realized with a rms of about 2 nanoseconds for a I-day session between two receivers distant of a few hundred of kilometers.