Feasibility of geosynchronous satellites for synthetic aperture radar remote sensing at Ka-BAND
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hdl:2117/11796
Tipus de documentText en actes de congrés
Data publicació2010
EditorEuropean Space Agency (ESA)
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Abstract
This document presents the conceptual design and analysis of a Synthetic Aperture Radar (SAR)
system based on geosynchronous satellites (GEOSAR) working at Ka-band. These satellites,
apparently orbiting in a fixed position relative to the Earth, are affected by slight perturbations of the
perfectly geostationary orbits (small inclinations and non zero eccentricities) that may be used to
generate a synthetic aperture radar for Earth Observation. The main advantage of GEOSAR is to
obtain short revisit pass (daily or less) with local coverage, thus complementary to typical Low Earth
Orbit SAR that achieve global coverage but with weekly or monthly revisit times. A further advantage
is the look direction, mainly South-North, that is truly complementary to the LEO satellites looking at
East-West. The LEO long revisit times prevent the observation of fast dynamic scenarios like natural
hazards, disasters, atmosphere, etc.
The GEOSAR main characteristics are presented and different configurations are proposed. Some
geosynchronous orbit considerations are shown to understand the particularities in the GEOSAR
geometry. The compromises between spatial resolution and sensitivity are obtained together with
basic operation parameters like Doppler Analysis, power link budget and ambiguities.
CitacióRuiz, J. [et al.]. Feasibility of geosynchronous satellites for synthetic aperture radar remote sensing at Ka-BAND. A: Ka and Broadband Communications Navigation and Earth Observation Conference. "Kaconf 2010". Milano: European Space Agency (ESA), 2010.
ISBNCD-ROM
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