Deep space tracking in local reference frames

Details Deep space tracking in local reference frames Deep space tracking in local reference frames

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988tdar.nasa....1t&link_type=abstract

In its The Telecommunications and Data Acquisition Report p 1-15 (SEE N89-10186 01-32)

Astronomy and Astrophysics

Astronomy

Deep Space Network, Parameter Identification, Position (Location), Radio Signals, Spacecraft Tracking, Very Long Base Interferometry, Angular Resolution, Astrometry, Covariance, Earth Rotation, Radio Sources (Astronomy), Space Navigation, Troposphere

Scientific paper

A self-calibrating deep space tracking technique is described which can potentially produce two nanoradian angular spacecraft determinations. The technique uses very long base interferometric observations of a spacecraft and several radio sources. The currently employed single source technique is described as a parameter estimation procedure. Then, the number of parameters and observations leads to the proposed local reference frame technique. Station clock, Earth rotation, and tropospheric parameters are estimated along with spacecraft position from the multisource observation sequence. The contributions to spacecraft angular uncertainty from system noise, tropospheric fluctuations, and uncalibrated radio source structure are evaluated. Of these experimental errors, radio source structure dominates the determination of the spacecraft position in the radio reference frame. It is shown, however, that the sensitivity of relative spacecraft position accuracies to time-invariant radio source structure effects may be on the order of 2 nanoradians.

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