Evaluation of GPS/UTC Steering Performance

reportActive / Technical Report | Accession Number: ADA518894 | Open PDF

Abstract:

The Global Positioning System GPS is required to maintain GPS time to UTC to an accuracy of one microsecond and broadcast to the user the offset between GPS and UTC to an accuracy of 100 nanoseconds 1 sigma. On June 25, 1990, an automatic steering algorithm was implemented to control GPS time to synchronize if with UTC. The description of the steering laws and predicted performance results were presented at the 1989 PTTI conference, while preliminary performance results were presented at the 1990 PTTI conference. The initial performance was not as predicted, resulting in an in-depth analysis of the observed performance and a more thorough sensitivity analysis. In addition, responses to anomalies were investigated. This paper will describe these analyses and results, and evaluate actual steering performance from June 1990 to November 1991. Although anomalies were observed during the initial phase of steering, recent experience is more in line with expectations.

Author(s):
Feess, W. A. ; Holtz, H. ; Satin, A. L. ; Yinger, C. H.
Author Organization(s):
AEROSPACE CORP EL SEGUNDO CA
Descriptive Note:
Congressional paper
Supplementary Note:
See also ADA255837. Precise Time and Time Interval (PTTI) Applications and Planning Meeting (23rd), held in Pasadena, CA, on 3-5 Dec 1991 DOI: 10.21236/ADA518894
Pagination:
0015

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Monitor Series:
USNO/AZ
 Subject Terms
Joint Capability Areas:
JCA_5_Command and Control; JCA_5.3_Planning; JCA_8_Building Partnerships; JCA_8.1_Communicate; JCA_8.1.3_Influence Adversary and Competitor Audiences; JCA_6.1.3_Switching and Routing; JCA_6_Net Centric; JCA_1_Force Support; JCA_1.2.5_Lessons Learned; JCA_6.1_Information Transport; JCA_8.2_Shape
Communities of Interest:
No COI(s) Identified
Descriptor(s):
*GLOBAL POSITIONING SYSTEM, *NAVIGATION SATELLITES, *RADIO BROADCASTING, ACCURACY, AUTOMATIC, MICROSECOND TIME, LAW ENFORCEMENT, USER NEEDS, STEERING, ANOMALIES, ALGORITHMS
Field(s)/Group(s):
Navigation and Guidance
Keyword(s):
UTC(UNIVERSAL COORDINATED TIME), SV(SATELLITE VEHICLES)
Report Date:
1991 Dec 01
Creation Date:
2010 May 12