Accession Number : ADA116894

Title :   Effect of Satellite Orbit Error on Computed Coordinates of Doppler Receivers.

Descriptive Note : Final rept.,

Corporate Author : NAVAL SURFACE WEAPONS CENTER DAHLGREN VA

Personal Author(s) : Anderle,Richard J

PDF Url : ADA116894

Report Date : Apr 1982

Pagination or Media Count : 82

Abstract : Positions of stations making Doppler observations of Navy Navigation Satellites are computed using predicted ephemerides broadcast by the satellites or using precise ephemerides computed in post analysis of data. When the broadcast ephemeris is used, it is customary to include a model of the ephemeris error in station position computations. Consideration of the ephemeris error, which can vary from pass to pass, is expected to improve the accuracy of station positions, particulary when the satellite is in view of two or more stations simultaneously. In contrast, precise ephemerides were originally used in 1963 to determine the positions of isolated sites. Although computations are currently performed for sites in close proximity, a systematic study has never been conducted to determine whether consideration of the error in the precise ephemeris would improve the accuracy of computations. This report compares the consistency of solutions for the relative locations of sites for various models of the error in the precise ephemeris.

Descriptors :   *Ephemerides, *Navigation satellites, *Satellite tracking systems, Errors, Orbits, Precision, Position finding, Standard deviation, Accuracy

Subject Categories : Unmanned Spacecraft
      Spacecraft Trajectories and Reentry

Distribution Statement : APPROVED FOR PUBLIC RELEASE