Computer Science – Performance
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995tdar.nasa...54b&link_type=abstract
In its The Telecommunications and Data Acquisition Report p 54-65 (SEE N95-32221 11-32)
Computer Science
Performance
Computer Systems Performance, Data Systems, Deep Space Network, Doppler Radar, Interplanetary Spacecraft, Interplanetary Trajectories, Performance Prediction, Radar Data, Space Navigation, Coordinates, Covariance, Data Processing, Error Analysis, Mathematical Models, Orbit Calculation, Sensitivity
Scientific paper
Recent improvements in computational capability and DSN technology have renewed interest in examining the possibility of using one-way Doppler data alone to navigate interplanetary spacecraft. The one-way data can be formulated as the standard differenced-count Doppler or as phase measurements, and the data can be received at a single station or differenced if obtained simultaneously at two stations. A covariance analysis, which analyzes the accuracy obtainable by combinations of one-way Doppler data, is performed and compared with similar results using standard two-way Doppler and range. The sample interplanetary trajectory used was that of the Mars Pathfinder mission to Mars. It is shown that differenced one-way data are capable of determining the angular position of the spacecraft to fairly high accuracy, but have relatively poor sensitivity to the range. When combined with single-station data, the position dispersions are roughly an order of magnitude larger in range and comparable in angular position as compared to dispersions obtained with standard two-way data types. It was also found that the phase formulation is less sensitive to data weight variations and data coverage than the differenced-count Doppler formulation.
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