Method and beam stepping apparatus for a satellite cellular communication system
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United States of America Patent
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Apr 14, 1998
Grant Date -
N/A
app pub date -
Nov 20, 1995
filing date -
Nov 20, 1995
priority date (Note) -
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status (Latency Note)
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Abstract
In a satellite cellular communication system (10), a phased array antenna (41) includes a dynamic beamformer (50) that provides individual antenna beams (35) within which communications with subscriber units (26) take place. The satellites (12) are located in several orbits (14). As the satellites move with respect to Earth's surface, each of the antenna beams is stepped backward (104) to compensate for the satellites movement. After each satellite travels a distance equal to a predetermined portion of the satellites' spacing in the orbit, each satellite's antenna beams are stepped forward (116) to replace the previous satellite's footprint. Accordingly, cell-to-cell hand-off is not required for subscriber units communicating within an antenna beam.
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