Computer Science – Emerging Technologies
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991tdar.nasa..113t&link_type=abstract
In its The Telecommunications and Data Acquisition Report p 113-131 (SEE N92-14237 05-32)
Computer Science
Emerging Technologies
Earth-Mars Trajectories, Interplanetary Navigation, Mars Satellites, Navigation Aids, Relay Satellites, Trajectory Control, Very Long Base Interferometry, Accuracy, Aerobraking, Error Analysis, Mission Planning, Rangefinding
Scientific paper
Future Mars exploration missions, both robotic and piloted, may utilize Earth to Mars transfer trajectories that are significantly different from one another, depending upon the type of mission being flown and the time period during which the flight takes place. The use of new or emerging technologies for future missions to Mars, such as aerobraking and nuclear rocket propulsion, may yield navigation requirements that are much more stringent than those of past robotic missions, and are very difficult to meet for some trajectories. This article explores the interdependencies between the properties of direct Earth to Mars trajectories and the Mars approach navigation accuracy that can be achieved using different radio metric data types, such as ranging measurements between an approaching spacecraft and Mars orbiting relay satellites, or Earth based measurements such as coherent Doppler and very long baseline interferometry. The trajectory characteristics affecting navigation performance are identified, and the variations in accuracy that might be experienced over the range of different Mars approach trajectories are discussed. The results predict that three sigma periapsis altitude navigation uncertainties of 2 to 10 km can be achieved when a Mars orbiting satellite is used as a navigation aid.
Matousek Steven E.
Thurman Sam W.
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