GPS time transfer

The authors describe the use of GPS (Global Positioning System) for time coordination. When GPS first became available, it provided a quantum leap in time coordination with little or no effort on the part of the user. However, workers realized that with more sophisticated analysis techniques even greater accuracy could be wrung from GPS. The authors describe the level of time coordination these more sophisticated techniques have affected. The principles of GPS time transfer are described with emphasis on the so-called common view method. The sources of error during GPS time transfer are discussed and the various possibilities of reducing them are investigated. Some possibilities for overcoming SA (selective availability of GPS) are also discussed. GPS is additionally shown to be an outstanding tool for the dissemination of Coordinated Universal Time (UTC). >

[1]  James J. Spilker,et al.  GPS Signal Structure and Performance Characteristics , 1978 .

[2]  Marc A. Weiss,et al.  The Use of Precise Ephemerides, Ionospheric Data and Corrected Antenna Coordinates in a Long-Distance GPS Time Transfer, , 1990 .

[3]  C. Miki,et al.  A Dual Frequency GPS Receiver Measuring Ionospheric Effects Without Code Demodulation and Its Application to Time Comparisons , 1988 .

[4]  W. Lewandowski,et al.  Positioning of GPS antennas in time-keeping laboratories of North America , 1989, Proceedings of the 43rd Annual Symposium on Frequency Control.

[5]  J. Klobuchar,et al.  Multipath effects on the determination of absolute ionospheric time delay from GPS signals , 1985 .

[6]  Marc A. Weiss,et al.  A codeless ionospheric calibrator for time transfer applications , 1989 .

[7]  Z. Altamimi,et al.  The initial IERS Terrestrial Reference Frame. , 1989 .

[8]  M. A. Weiss,et al.  Precise Ephemerides for GPS Time Transfer , 1989 .

[9]  Wlodzimierz W. Lewandowski,et al.  Sensitivity to the external temperature of some GPS time receivers , 1990 .

[10]  D. W. Allan,et al.  Practical implications of relativity for a global coordinate time scale , 1979 .

[11]  R. J. Milliken,et al.  PRINCIPLE OF OPERATION OF NAVSTAR AND SYSTEM CHARACTERISTICS (GPS SYSTEM DESCRIPTION) , 1978 .

[12]  W. Lewandowski,et al.  GPS time transfer with implementation of selective availability , 1990 .

[13]  Peter F. MacDoran,et al.  Satellite emission radio interferometric earth surveying series—GPS geodetic system , 1979 .

[14]  D. Wells,et al.  Guide to GPS positioning , 1987 .

[15]  B. Guinot,et al.  Improvement of the GPS time comparisons by simultaneous relative positioning of the receiver antennas , 1989 .

[16]  Marc A. Weiss,et al.  A Calibration of GPS Equipment at Time and Frequency Standards Laboratories in the USA and Europe , 1987 .

[17]  M Weiss,et al.  A Calibration of GPS Equipment in Japan , 1988 .

[18]  C. Thomas,et al.  Improvement of Time Comparison Results by using GPS Dual Frequency Codeless Receivers Measuring Ionospheric Delay , 1989 .

[19]  D. W. Allan,et al.  Accurate Time and Frequency Transfer During Common-View of a GPS Satellite , 1980 .

[20]  B. W. Remondi,et al.  GPS BROADCAST ORBITS VERSUS PRECISE ORBITS: A COMPARISON STUDY , 1990 .