Computer Science – Sound
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991spie.1478...76b&link_type=abstract
Proc. SPIE Vol. 1478, p. 76-91, Sensors and Sensor Systems for Guidance and Navigation, Jack F. Wade; Avi Tuchman; Eds.
Computer Science
Sound
Scientific paper
This paper describes the overall configuration and performance of a comet approach and landing system (CALS), a space-borne sensor package for navigation toward a low-gravity celestial body in an interplanetary environment. The sensor system is aimed at satisfying the requirements of the Rosetta/CNSR (comet nucleus sample return) mission, whose objective is to land on a cometary surface and to retrieve samples that will be analyzed on the ground after Earth re-entry. Several constraints at the mission and spacecraft level make the configuration of a suitable sensor package a quite complex problem. The baseline system includes the following sensors, all mounted on a high-precision gimballed platform: (1) high-resolution camera, for detection of the comet at large distance and mapping at medium/short distance for ground-assisted landing site selection; (2) wide-angle camera with data processing equipment (star and target tracker), able to track simultaneously the irregular comet image and the surrounding stars for autonomous navigation; (3) laser topographic mapper for autonomous topography-assisted navigation in the final descent phase; (4) multitask radar altimeter for the on-board measurement of range, attitude, 3-axis velocity and surface roughness, with a microwave sounder section for the determination of subsurface structure and composition.
Bonsignori Roberto
Maresi Luca
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