Satellite navigation
Abstract
The current Transit, the planned Navstar-GPS, and the proposed ESA Navsat satellite navigation systems are examined and compared. The fundamental principles of range measurement using pseudorandom-noise codes and of Doppler range-rate measurement are reviewed, and the methods used in the Transit and Navstar systems to provide ephemeris data and correct for errors due to ionospehric and tropospheric propagation effects and general special relativity effects are discussed. The Navstar navigation process, using data from four satellites to solve four simultaneous equations for four unknowns, is analyzed; a similar process is being considered for the Navsat system, which would use 24 transponder-only satellites and a simpler signal format.
- Publication:
-
Electronics Communications of Japan
- Pub Date:
- 1984
- Bibcode:
- 1984JElCo..58..352B
- Keywords:
-
- Air Navigation;
- Navstar Satellites;
- Satellite Navigation Systems;
- Surface Navigation;
- Technology Assessment;
- Transit Satellites;
- Atmospheric Effects;
- Esa Satellites;
- Instrument Errors;
- Rangefinding;
- Relativistic Effects;
- Transponders;
- Space Communications, Spacecraft Communications, Command and Tracking