Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jbis...38..444j&link_type=abstract
British Interplanetary Society, Journal (Mission Systems) (ISSN 0007-084X), vol. 38, Oct. 1985, p. 444-449. NASA-supported resea
Astronomy and Astrophysics
Astronomy
Astronavigation, Celestial Navigation, Interplanetary Flight, Interplanetary Navigation, Accuracy, Data Processing, Voyager 1 Spacecraft, Voyager 2 Spacecraft
Scientific paper
The elements of the measurement and communications network comprising the global deep space navigation system (DSN) for NASA missions are described. Among the measurement systems discussed are: VLBI, two-way Doppler and range measurements, and optical measurements carried out on board the spacecraft. Processing of navigation measurement is carried out using two modules: an N-body numerical integration of the trajectory (and state transition partial derivatives) based on pre-guessed initial conditions; and partial derivatives of simulated observables corresponding to each actual observation. Calculations of velocity correction parameters is performed by precise modelling of all physical phenomena influencing the observational measurements, including: planetary motions; tracking station locations, gravity field structure, and transmission media effects. Some of the contributions to earth-relative orbit estimate errors for the Doppler/range system on board Voyager are discussed in detail. A line drawing of the DSN navigation system is provided.
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