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NASA’s global differential GPS system and the TDRSS augmentation service for satellites

Show simple item record Bar-Sever, Yoaz Young, Larry Stocklin, Frank Rush, John 2006-02-27T20:53:27Z 2006-02-27T20:53:27Z 2004-12
dc.identifier.citation 2nd ESA Workshop on Satellite Navigation User Equipment Technologies NAVITEC 2004, Noordwijk, The Netherlands, December, 2004 en
dc.identifier.clearanceno 04-3624
dc.description.abstract NASA is planning to launch a new service for Earth satellites providing them with precise GPS differential corrections and other ancillary information enabling decimeter level orbit determination accuracy, and nanosecond time-transfer accuracy, onboard, in real-time. The TDRSS Augmentation Service for Satellites (TASS) will broadcast its message on the S-band multiple access channel of NASA's Tracking and Data Relay Satellite System (TDRSS). The satellite's phase array antenna has been configured to provide a wide beam, extending coverage up to 1000 km altitude over the poles. Global coverage will be ensured with broadcast from three or more TDRSS satellites. The GPS differential corrections are provided by the NASA Global Differential GPS (GDGPS) System, developed and operated by NASA’s Jet Propulsion Laboratory. The GDGPS System employs a global ground network of more than 70 GPS receivers to monitor the GPS constellation in real time. The system provides real-time estimates of the GPS satellite states, as well as many other real-time products such as differential corrections, global ionospheric maps, and integrity monitoring. The unique multiply redundant architecture of the GDGPS System ensures very high reliability, with 99.999% demonstrated since the inception of the system in Early 2000. The estimated real time GPS orbit and clock states provided by the GDGPS system are accurate to better than 20 cm 3D RMS, and have been demonstrated to support sub-decimeter real time positioning and orbit determination for a variety of terrestrial, airborne, and spaceborne applications. In addition to the GPS differential corrections, TASS will provide real-time Earth orientation and solar flux information that enable precise onboard knowledge of the Earth-fixed position of the spacecraft, and precise orbit prediction and planning capabilities. TASS will also provide 5 seconds alarms for GPS integrity failures based on the unique GPS integrity monitoring service of the GDGPS System en
dc.description.sponsorship NASA/JPL en
dc.format.extent 1705799 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2004. en
dc.subject Global Postitioning Satellite (GPS) en
dc.subject Tracking and Data Relay Satellite (TDRS) en
dc.title NASA’s global differential GPS system and the TDRSS augmentation service for satellites en
dc.type Preprint en

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