Patent ID: 9062971
Filing Date: 2015-06-23
Classification: G01C,Y10T

Abstract:
1. An electronic circuit comprising: an e-compass oriented with a heading and having e-compass sensors mounted on different axes, the e-compass having sensor circuitry with outputs that supply e-compass sensor data; a tilt sensor including sensor circuitry having outputs to supply tilt sensor data; memory circuitry having inputs and outputs and holding a tilt angle e-compass calibration parameter, the tilt angle e-compass calibration parameter representing a residual tilt angle e-compass calibration parameter arising from non-idealities in the tilt sensor and remaining after a coarse detilting procedure performed in response to tilt sensor data and on calibration data from the e-compass sensors; and electronic processor circuitry having leads coupled to the e-compass sensor outputs and to the memory circuitry outputs, the electronic processor circuitry responsive to the e-compass sensor data and the tilt angle e-compass calibration parameter to generate at least one output signal representing a measured heading of the e-compass corrected using the tilt angle e-compass calibration parameter.