Gravity gradient mapping from the Lunar Polar Orbiter - A simulation study

Details Gravity gradient mapping from the Lunar Polar Orbiter - A simulation study Gravity gradient mapping from the Lunar Polar Orbiter - A simulation study

Dec 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976moon...16....3f&link_type=abstract

The Moon, vol. 16, Dec. 1976, p. 3-26.

Computer Science

2

Doppler Effect, Gravity Anomalies, Gravity Gradiometers, Lunar Gravity Simulator, Lunar Maps, Lunar Orbiter, Data Reduction, Error Analysis, Instrument Errors, Point Sources, Polar Orbits, System Effectiveness, Tracking Stations

Scientific paper

The high-resolution capability of gravity-measurement systems for a Lunar Polar Orbiter spacecraft is investigated by simulating the responses of a Doppler-velocity system and a gravity-gradiometer system to a point-mass model that produces a gravity field closely resembling the actual lunar field. A simplified error model is used in which total errors are assumed to be dominated by instrument and data-quantization noise. Vertical gravity contour plots at altitudes of 15, 30, and 60 km are constructed for both systems, effects of system noise on the contours are evaluated, and gravity measurements at an altitude of 100 km are examined. The results show that if the accuracy of the systems remains at present levels, the gravity-gradient data are superior in both resolution and amplitude-to-single-point-noise level at all altitudes below 100 km. It is noted that the Doppler-difference and gradient plots have comparable S/N ratios at an altitude of 200 km and that the Doppler system will outperform the gradiometer system at altitudes higher than 200 km.

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