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Patent
H - Electricity
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Patent
CA 2121349
2121349 9309614 PCTABS00022 Beam Compensation Methods pertain to the management of radio beams (11) which are generated by a constellation of satellites (S). These beams (11) are precisely controlled so that they illuminate ''Earth-fixed cells'' as opposed to ''satellite-fixed cells''. In previous satellite communication schemes, spacecraft which are not held stationary over one particular location on the Earth in geo-synchronous orbits fly over large regions of the Earth very rapidly. In a system that employs satellite-fixed cells, the ''footprint'' (10) of the radio beams (11) propagated by the spacecraft defines the zone on the ground called a ''cell'' which is illuminated by the spacecraft. This satellite-fixed cell moves constantly as the spacecraft moves around the globe. In sharp contrast, an ''Earth-fixed cell'' (14) is a stationary region mapped onto the surface of the Earth that has permanent fixed boundaries, just like a city or a state.
Patterson David Palmer
Sturza Mark Alan
Macrae & Co.
Teledesic Corporation
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