4/6/2024 0 Comments Tts4Moreover, even GLONASS control segment itself was not sure which data is more accurate VNIIFTRI or BIPM. From very beginning, there was about 200 ns difference in UTC-GLO ST monitoring data originated from VNIIFTRI and the BIPM publications based on western laboratories measurements data. Since that time, have been changed a few generations of the receiver and every new model has been calibrated against previous one to ensure measurement continuity. Peter Daly from Leeds University has developed the beginner of GLONASS receivers in western countries. Now we use TTS3, TTS4 receivers for this purpose. Each step of receiver change included relative calibration procedure to maintain UTC(SU) – GLO ST continuous. Ever since that time, have been used many receiver’s type in VNIIFTRI for monitoring. VNIIFTRI started such monitoring since end of 80th. That’s why one of continuous tasks of VNIIFTRI is to monitor actual time difference between UTC(SU) and GLO ST and conformity to this value of the ?c = UTC(SU) + 03h00m + GLO ST, broadcasted in GLONASS navigation message. The First Absolute Delay Determination of GLONASS Time Receiver for TAI Time Transfer Link CalibrationĪccording to GLONASS ICD UTC(SU) is a reference time scale for GLONASS System Time (GLO ST).
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