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<TITLE>Abstract AAS 97-622</TITLE>
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<h2>AAS 97-622</h2>
<h2>UPH CONSTELLATIONS FOR CONTINUOUS REGIONAL COVERAGE </h2>
<h4> C. Ulivieri, G. Laneve, S.M. Hejazi M. - University of Rome, Rome, Italy </h4>
<h2> Abstract </h2>
The detection of environmental contingencies is possible only if a sufficient number of sensors is available; then the constellation appears the only solution in order to limit the temporal gaps of acquisition caused by the utilization of a single spacecraft mission. The paper describes the use of Uniformly Phased Homogeneous (UPH) constellations of small remote sensing satellites to guarantee a complete high-revisit coverage of a target geographical zone. The paper first details the constellation design (orbital characteristics and number of satellites) to perform the desired revisit frequency and the necessary number of groundtraces that guarantee a complete spatial coverage; then the configuration maintenance criteria are described.
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