NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
NASA's global differential GPS system and the TDRSS augmentation service for satellitesNASA 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.
Document ID
20060043681
Acquisition Source
Jet Propulsion Laboratory
Document Type
Conference Paper
External Source(s)
Authors
Bar-Sever, Yoaz
Young, Larry
Stocklin, Frank
Rush, John
Date Acquired
August 23, 2013
Publication Date
December 1, 2004
Meeting Information
Meeting: 2nd ESA Workshop on Satellite Navigation User Equipment Technologies NAVITEC 2004
Location: Noordwijk
Country: Netherlands
Start Date: December 1, 2004
Distribution Limits
Public
Copyright
Other
Keywords
Global Postitioning Satellite (GPS)
Tracking and Data Relay Satellite (TDRS)

Available Downloads

There are no available downloads for this record.
No Preview Available