Method and apparatus for synchronizing to a multi-beam satellite

Details Method and apparatus for synchronizing to a multi-beam satellite Method and apparatus for synchronizing to a multi-beam satellite

1994-06-30

1995-10-31

Blum, Theodore M.

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

Directive

Including a satellite

455 331, H04B 7185

Patent

active

054634008

ABSTRACT:
In a satellite based cellular communication system where the satellites move with respect to the surface of the Earth and have antenna patterns covering thousands of miles, subscriber units must initially access the communication system at a proper frequency and during a proper time slot. Subscriber units compensate for the propagation delay and frequency-shift associated with the distance to a satellite and the velocity of the satellite. The subscriber unit determines the antenna beam of the satellite within which it is located and receives the antenna beam's center coordinates. The location of the satellite is calculated and the propagation distance to the satellite is estimated. Based on the distance to the satellite and the satellite's velocity, the subscriber unit transmits an acquisition request at the proper time and frequency so that it is received within the satellite's timing window. The subscriber unit also adjusts is transmission frequency to compensate for the frequency shift associated with satellite's motion.

REFERENCES:
patent: 4860018 (1989-08-01), Counselman, III
patent: 5012254 (1991-04-01), Thompson
patent: 5019824 (1991-05-01), Kumar
patent: 5227802 (1993-07-01), Pullman et al.

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