Microwave instrument for planetary mission (Titan/CASSINI mission orbiter spacecraft)

Details Microwave instrument for planetary mission (Titan/CASSINI mission orbiter spacecraft) Microwave instrument for planetary mission (Titan/CASSINI mission orbiter spacecraft)

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987bapl.rept.....w&link_type=abstract

Final Report British Aerospace Public Ltd. Co., Bristol (England). Space and Communications Div.

Computer Science

Sound

Atmospheric Sounding, Microwave Sensors, Satellite Altimetry, Satellite Atmospheres, Satellite Imagery, Titan, Antenna Design, Imaging Radar, Radar Imagery

Scientific paper

A microwave altimeter/imager for the investigation of Titan from the CASSINI mission Saturn orbiter was designed. Performance goals are 5 km imaging resolution with a 400 km swath width and an altimetric resolution of 50 m. It is concluded that atmospheric absorption is negligible for frequencies below 40 GHz. The baseline uses a 30 GHz carrier frequency and a dedicated imaging radar antenna. By using a time-multiplex scheme it is possible to obtain simultaneous, continuous, altimeter profiles, real aperture medium resolution images, and synthetic aperture high resolution images. The baseline uses the probe relay dish antenna for altimetry and a 3 m by 0.2 m antenna panel for imaging radar. From a block diagram level design of the complete system including RF hardware, high-power amplifier, waveform generator, and digital processing subsystems, mass and power budgets and critical components were defined. The principal mission constraint is limited coverage from Titan flybys to no closer than 1000 km. The accommodation of the 3 m x 0.2 m imager antenna and its pointing requirements are the principal spacecraft constraints.

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