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GPS Space Service Volume : Ensuring Consistent Utility Across GPS Design Builds for Space Users

Author:
Parker, Joel Jefferson Konkl
Published:
May 27, 2015.
Physical Description:
1 electronic document
Additional Creators:
Bauer, Frank H. and Valdez, Jennifer Ellen
Online Version

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Restrictions on Access:
Unclassified, Unlimited, Publicly available.
Free-to-read Unrestricted online access
Summary:
GPS availability and signal strength originally specified for users on or near surface of Earth with transmitted power levels specified at edge-of-Earth, 14.3 degrees. Prior to the SSV specification, on-orbit performance of GPS varied from block build to block build (IIA, IIRM, IIF) due to antenna gain and beam width variances. Unstable on-orbit performance results in significant risk to space users. Side-lobe signals, although not specified, were expected to significantly boost GPS signal availability for users above the constellation. During GPS III Phase A, NASA noted significant discrepancies in power levels specified in GPS III specification documents, and measured on-orbit performance. To stabilize the signal for high altitude space users, NASA DoD team in 2003-2005 led the creation of new Space Service Volume (SSV) definition and specifications.
Other Subject(s):
Collection:
NASA Technical Reports Server (NTRS) Collection.
Note:
Document ID: 20150011650.
GSFC-E-DAA-TN23947.
National Space-Based Positioning, Navigation, and Timing Advisory Board Meeting; 11-12 Jun. 2015; Annapolis, MD; United States.
Terms of Use and Reproduction:
Copyright, Distribution as joint owner in the copyright.
View MARC record | catkey: 17532455