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Gps/refsat definition study report for low-cost terminals
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Copyright Year | 1980 |
| Description | A relay transponder, located either on a satellite in geostationary orbit or on a local tower to relay acquisition-aiding data, ephemerides, etc, from a ground-based remote control station to a GPS civil user terminal located on a ship or land-transportation vehicle is described. Termed REFSAT (Reference Satellite), this concept reduces the circuit complexity and cost of user terminals. The various systems needed to implement the REFSAT concept for low-cost, GPS civil terminals are defined. The GPS/REFSAT system compatible with the NAVSTAR GPS system consists of a geostationary relay satellite, civil user terminals, and the central facility which performs operations common to all users for relay via the space segment. A GPS/REFSAT system utilizing a local tower for the relay transponder is described, results of a study of civil user requirements are presented, and specifications for the GPS/REFSAT system and its individual segments are included. |
| File Size | 1442329 |
| Page Count | 68 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19810019777 |
| Archival Resource Key | ark:/13960/t7vm92g44 |
| Language | English |
| Publisher Date | 1980-11-01 |
| Access Restriction | Open |
| Subject Keyword | Communications And Radar Radio Relay Systems Receivers Global Positioning System Uplinking Transponders Remote Control Navstar Satellites Downlinking User Requirements Satellite Antennas Transmitters Earth Terminals Signal Processing Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
