×

Vehicle-mounted satellite signal receiving apparatus

  • US 5,828,337 A
  • Filed: 05/22/1997
  • Issued: 10/27/1998
  • Est. Priority Date: 05/24/1996
  • Status: Expired due to Term
First Claim
Patent Images

1. A vehicle mounted satellite signal receiving apparatus comprising:

  • an antenna mounted on a vehicle;

    a gyro sensor for detecting an angular velocity of azimuth rotation of said vehicle;

    offset error correcting means for adding a correction value, which is used to correct an offset error of an output signal of said gyro sensor, to said output signal and for outputting a corrected output signal of said gyro sensor, which is derived from said correction of said offset error;

    gyro tracking means for controlling direction of said antenna based on said corrected output signal of said gyro sensor when a reception level of a satellite signal is greater than or equal to a first predetermined value;

    step tracking means for controlling a direction of said antenna so as to raise said reception level when said reception level is less than said first predetermined value; and

    revising means for revising said correction value by adding a revision value, which is in a same direction as a direction of control caused by said step tracking means, to said correction value when said reception level is less than said first predetermined value and said step tracking means commences controlling said direction of said antenna.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×