Computer Science – Numerical Analysis
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991stin...9217241h&link_type=abstract
Unknown
Computer Science
Numerical Analysis
Acquisition, Focal Plane Devices, Infrared Detectors, Infrared Signatures, Position (Location), Apertures, Elevation, Gallium, Mathematical Models, Mercury Cadmium Tellurides, Numerical Analysis, Satellite Orbits, Silicon, Telescopes, Trajectories
Scientific paper
The feasibility of acquiring satellites from the ground by using infrared focal-plane-array detectors is analyzed. The orbits of the satellites are assumed to be known to within a position uncertainty of + or - 50 km. Effects of the atmosphere have been modeled by the LOWTRAN7 code. Properties of five different available detectors have been inserted in the mathematical model. A telescope aperture of 60 cm (approx. 24 inches) is assumed in the numerical evaluations. Results are presented in graphs showing the region of space within which each candidate detector array can sense a satellite of a given infrared signature. The PtSi array can sense a medium-sized satellite in low earth orbit. A small, low-orbit satellite can be sensed at a low elevation by the HgCdTe array. That same array could also sense a medium-sized satellite at a 10,000-km altitude. Results for the InSb, Si:Ga, and IrSi arrays fall between these extremes.
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