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Antenna beam pointing method for satellite mobile communications system

  • US 5,241,319 A
  • Filed: 04/19/1991
  • Issued: 08/31/1993
  • Est. Priority Date: 04/19/1990
  • Status: Expired due to Term
First Claim
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1. A method for tracking a satellite used in a land mobile satellite communications system, a rate gyro being used if an automatic satellite tracking is prevented, said method comprising the steps of:

  • (a) automatically tracking the satellite responsive to a receive signal level if the receive signal level equals or exceeds a threshold, said threshold indicating a signal level below which automatic satellite tracking cannot be carried out;

    (b) compensating for first and second rate gyro output factors while automatically tracking the satellite, said first rate gyro output factor being a voltage offset factor by which a voltage offset of the rate gyro output is corrected, and said second rate gyro output factor being a scale factor for converting the rate gyro output into a rate gyro indicating an antenna angular velocity, said rate gyro being compensated in response to said first rate gyro output factor; and

    (c) tracking the satellite using the output of the rate gyro if the receive signal level falls below the threshold indicating that the automatic satellite tracking is unable.

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