Time transfer equipment and techniques used with the NRL Navigation Technology Satellites have been modified and extended for use with the GPS satellites . A prototype receiver was built and field tested at NASA's Kennedy Spaceflight Center. The receiver uses the GPS L1 link at 1575 MHz with C/A code only to resolve a measured range to the satellite . A theoretical range is computed from the satellite ephemeris transmitted in the data message and the user's coordinates. Results of user offset from GPS time are obtained by differencing the measured and theoretic,d ranges and applying calibration corrections. These results may be referenced to Naval Observatory Time through published values of offsets of GPS Time from USNO Master Clock 1 . Results of the first field test evaluation of the receiver are presented. Measurements were made at NASA Goddard's MILA facility located in the Kennedy Spaceflight Center, Fla. Portable clock measurements were made for comparison, and all measurements were referenced to the Naval Observatory.
Global Positioning System Time Transfer Receiver (GPS/TTR) Prototype Design and Initial Test Evaluation
1981
32 pages
Report
Keine Angabe
Englisch
Computers, Control & Information Theory , Navigation Systems , Unmanned Spacecraft , Artificial satellites , Timing devices , Navigation satellites , Global positioning system , Message processing , Military publications , Planetary satellites , User needs , Portable equipment , Field tests , Clocks , Measurement , Calibration
Dive Computer with Global Positioning System Receiver
Europäisches Patentamt | 2017
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