Satellite based earth fixed cell tracking method

Details Satellite based earth fixed cell tracking method Satellite based earth fixed cell tracking method

H - Electricity

04

B

H04B 7/185 (2006.01) B64G 1/10 (2006.01) B64G 1/24 (2006.01) B64G 1/66 (2006.01) H04B 7/204 (2006.01) H04Q 7/36 (2006.01)

Patent

CA 2266154

The invention relates to rotating antenna feed structures and shaped reflector antennas to be used on satellites for uplink-downlink uses. The rotating antenna feeds, mounted on a device reminiscent of a wheel or roller, rolling in the direction of motion of the satellite, provide a multiplicity of spot beams. The shaped reflectors remove the distortions caused by the shape of the earth and the orbit geometry. These distortions include an hour-glass shaped distortion due to the intersection of a conical scan with the Earth's surface and a variable speed distortion due to the differing propagation geometry as the beams rotate beneath the satellite. Removal of a varying cross-orbit velocity, due to the 24 hour per day rotation of the Earth, is accomplished with varying yaw rotations of the satellite.

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