SCIENTIFIC AND TECHNICAL AEROSPACE REPORTS
A Biweekly Publication of the National Aeronautics and Space Administration
VOLUME 43, ISSUE 25 - DECEMBER 16, 2005
88 SPACE SCIENCES (GENERAL)
Includes general research topics related to the natural space sciences.
For specific topics in space sciences see categories 89 through 93.
20050243009 Naval Postgraduate School, Monterey, CA USA
GPS Ephemeris Message Broadcast Simulation
Browne, Nathan J.; Light, James J.; Sep. 1, 2005; 85 pp.; In English; Original contains color illustrations Report No.(s): AD-A439430; No Copyright; Avail.: CASI: A05, Hardcopy
The warfighter constantly needs increased accuracy from GPS and a means to increasing this accuracy to the decimeter level is a broadcast ephemeris message containing GPS satellite orbit and clock corrections. The ephemeris message is produced at the GPS MCS (Master Control Station) which receives GPS signal data from NGA and Air Force worldwide and uses sophisticated software to produce the orbit and clock corrections. The problem is getting the ephemeris message to the tactical user in a forward operating area. This thesis proposed a notional architecture for pushing the ephemeris message to the tactical user. It then modeled the architecture and simulated the broadcast of the ephemeris message to a tactical user using NETWARS. The baseline architecture was simulated and analyzed and then additional constraints were placed upon the network to simulate a real-world model. The simulation results demonstrated that the architecture was feasible for ephemeris message broadcast with the constraints on time intervals between broadcasts, residual traffic and message size. DTIC
Broadcasting; Ephemerides; Global Positioning System; Messages; Simulation
Source: NASA.
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