Title :
Measurements and analysis of the frequency stability of GPS Navstar clocks
Author :
McCaskill, T.B. ; Largay, M.M. ; Oaks, O.J. ; Reid, W.G. ; Buisson, J.A. ; Warren, H.E.
Author_Institution :
US Naval Res. Lab., Washington, DC, USA
fDate :
June 27 1994-July 1 1994
Abstract :
Analysis of the frequency stability of Global Positioning System (GPS) on-orbit Navstar clocks is performed by the Naval Research Laboratory (NRL). Clock offsets for each Navstar clock are derived from smoothed pseudorange measurements collected as the Navstar space vehicle passes over the tracking station. The clock offsets are further smoothed and estimated at the time of closest approach (TCA) of the space vehicle over the tracking station. Analysis of more than 50 Navstar clocks by NRL shows that the majority of these clocks provide performance that exceeds the GPS frequency stability specification. This precision measurement technique is capable of determining one-day frequency stabilities of the Navstar GPS clocks to an accuracy of better than 1/spl times/10/sup -13/.<>
Keywords :
clocks; frequency stability; radionavigation; satellite relay systems; time measurement; GPS Navstar clocks; Global Positioning System; NRL; Naval Research Laboratory; Navstar space vehicle; frequency stability; smoothed pseudorange measurements; time of closest approach; tracking station; Clocks; Extraterrestrial measurements; Frequency measurement; Frequency synchronization; Global Positioning System; Laboratories; Satellite navigation systems; Space vehicles; Stability analysis; Uncertainty;
Conference_Titel :
Precision Electromagnetic Measurements, 1994. Digest., 1994 Conference on
Conference_Location :
Boulder, CO, USA
Print_ISBN :
0-7803-1984-2
DOI :
10.1109/CPEM.1994.333318
