Computer Science
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994tdar.nasa....1k&link_type=abstract
In its The Telecommunications and Data Acquisition Report p 1-15 (SEE N94-35542 11-32)
Computer Science
3
Celestial Reference Systems, Deep Space Network, Mars Observer, Rangefinding, Satellite Observation, Spacecraft Tracking, Telemetry, Global Positioning System, Quasars
Scientific paper
Current methods of angular spacecraft positioning using station differenced range data require an additional observation of an extragalactic radio source (quasar) to estimate the timing offset between the reference clocks at the two Deep Space Stations. The quasar observation is also used to reduce the effects of instrumental and media delays on the radio metric observable by forming a difference with the spacecraft observation (delta differential one-way range, delta DOR). An experiment has been completed using data from the Global Positioning System satellites to estimate the station clock offset, eliminating the need for the quasar observation. The requirements for direct measurement of the instrumental delays that must be made in the absence of a quasar observation are assessed. Finally, the results of the 'quasar-free' differential one-way range, or DOR, measurements of the Mars Observer spacecraft are compared with those of simultaneous conventional delta DOR measurements.
Border James S.
Kroger P. M.
Nandi Satyanarayan
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