E-compass, tilt sensor, memory and processor with coarse detilting procedure
First Claim
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.
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Accused Products
Abstract
An electronic circuit includes an electronic compass having e-compass sensors mounted on different axes and operable to supply e-compass sensor data, memory circuitry, and an electronic processor coupled to said e-compass sensors and to said memory circuitry, said electronic processor operable to execute an electronic ellipse-fitting procedure responsive to the e-compass sensor data to generate at least one signal related to an ellipse tilt angle, and store the at least one signal in said memory circuitry as a tilt calibration parameter for the e-compass. Processes for calibrating an e-compass, as well as electronic circuits and processes for correcting measured heading, and processes of manufacture are also disclosed.
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Citations
5 Claims
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1. An electronic circuit comprising:
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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. - View Dependent Claims (2, 3, 4, 5)
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Specification