Influence of Ephemeris Error on GPS Single Point Positioning Accuracy

Open access


The Global Positioning System (GPS) user makes use of the navigation message transmitted from GPS satellites to achieve its location. Because the receiver uses the satellite's location in position calculations, an ephemeris error, a difference between the expected and actual orbital position of a GPS satellite, reduces user accuracy. The influence extent is decided by the precision of broadcast ephemeris from the control station upload. Simulation analysis with the Yuma almanac show that maximum positioning error exists in the case where the ephemeris error is along the line-of-sight (LOS) direction. Meanwhile, the error is dependent on the relationship between the observer and spatial constellation at some time period.

George W., and Collins II. (2004) The Foundations of Celestial Mechanics. Case Western Reserve University.

Kaplan E., and Hegarty C. (2006) Understanding GPS: Principles and Applications. Artech House.

Langley R. (1999) Dilution of precision. GPS World, Vol. 10, No. 5, 52-59.

Misra P., and Enge P. (2006) Global Positioning System: Signals, Measurements, andPerformance. Ganga-Jamuna Press.

Warren D., and Raquet J. (2002) Broadcast vs Precise GPS Ephemerides: A Historical Perspective, Proceedings of the 2002 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 2002, p. 733-741.

Artificial Satellites

The Journal of Space Research Centre of Polish Academy of Sciences

Journal Information

CiteScore 2017: 0.71

SCImago Journal Rank (SJR) 2017: 0.302
Source Normalized Impact per Paper (SNIP) 2017: 0.703


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