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Systems and methods for calibrating and adjusting a heading reference system

  • US 9,476,734 B2
  • Filed: 03/03/2016
  • Issued: 10/25/2016
  • Est. Priority Date: 03/15/2013
  • Status: Active Grant
First Claim
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1. A method for recalibrating an aircraft attitude and reference heading system comprising at least one magnetometer, the method comprising the steps of:

  • selectively positioning an aircraft on the ground along the Earth'"'"'s surface at a single known magnetic heading;

    obtaining an actual reading from the at least one magnetometer at the known magnetic heading while the aircraft is stationary on the ground;

    determining a theoretical reading for the at least one magnetometer at the known magnetic heading based, at least in part, on an attitude value that was determined during an initial calibration of the aircraft;

    calculating a recalibrated universal average gain and offset based, at least in part, on the actual reading and the theoretical reading;

    utilizing the recalibrated universal average gain and offset to determine a recalibrated magnetic heading for the aircraft and recalibrate the heading system for measurement errors;

    determining a misalignment value based, at least in part, on a comparison of the known magnetic heading and the recalibrated magnetic heading; and

    utilizing the misalignment value to adjust the heading system for misalignment errors.

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