Method and beam stepping apparatus for a satellite cellular comm

Details Method and beam stepping apparatus for a satellite cellular comm Method and beam stepping apparatus for a satellite cellular comm

1995-11-20

1998-04-14

Tarcza, Thomas H.

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a satellite

342372, 342373, H04B 7185

Patent

active

057397848

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.

REFERENCES:
patent: 3725929 (1973-04-01), Spanos
patent: 3737899 (1973-06-01), Georgopoulos
patent: 4090199 (1978-05-01), Archer
patent: 4691205 (1987-09-01), Profera, Jr.
patent: 5103232 (1992-04-01), Chang et al.
patent: 5353032 (1994-10-01), Bertocchi et al.
patent: 5408237 (1995-04-01), Patterson et al.
patent: 5444445 (1995-08-01), Poskett et al.
patent: 5548254 (1996-08-01), Sturza
"The Globalstar System", Applied Microwave & Wireless Summer 1995, Edward Hirschfield, pp. 26-41.

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