RECENT (1973) IMPROVEMENTS IN THE NAVY NAVIGATION SATELLITE SYSTEM

Removal of the Pole Wander (Chandler wobble) as a source of bias in the Transit Navigation System has improved the precision available to a stationary user (surveyor). The precision associated with the mean of several (say 20) combined passes should be less than 5 meters. The dominant items in the error budget will remain (for a land-based user) uncertainty in the sattelite position and instrumentation errors. For an at-sea, non-stationary user; the errors are much larger and (still) dominated by uncertainties in the user's motion; typically 400 meters/knot of navigator's velocity error. The changes discussed here will not alter this situation in any way. We discuss, herein, just how the polar motion is accounted for in the system. No changes are required of any user's hardware or computer programs. The benefits accrue to him automatically via an improved precision ephemeris in the satellite which now contains the polar motion implicity. The improvement will be implemented on Dec. 15, 1973. The Transit Coordinate System is reviewed and the recent performance (accuracy) of the system described.

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  • Supplemental Notes:
    • Presented at the National Aerospace Meeting, Washington, D.C., March 13, 1973.
  • Corporate Authors:

    Institute of Navigation

    815 14th Street, NW
    Washington, DC  USA  20005
  • Authors:
    • Piscane, V L
    • Holland, B B
    • Black, H D
  • Publication Date: 1973-9

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Filing Info

  • Accession Number: 00051177
  • Record Type: Publication
  • Source Agency: Institute of Navigation
  • Files: TRIS
  • Created Date: Feb 28 1974 12:00AM