G - Physics – 01 – C
Patent
G - Physics
01
C
324/28, 33/97, 3
G01C 17/30 (2006.01) G01C 17/38 (2006.01)
Patent
CA 1266173
ABSTRACT OF THE DISCLOSURE A technique is provided to combine software and hardware; the hardware being used to place voltage levels into narrow ranges and the software being used to perform the precise calibration. A ranging circuit is provided for use in a control circuit for an electronic compass, including a microcomputer, a flux-gate, a flux-gate driver, a bandpass filter, a synchronous detector, an integrator, a summing amplifier. The ranging circuit puts a designated current through the flux-gate and includes an operational amplifier with resistive negative feedback connected to the output of the integrator; an RC charging network connected to the non- inverting input to the operational amplifier; a gate switch connected between the RC charging network and the microcomputer such that the microcomputer charges the RC charging network when the gate switch is closed; and comparator means to respond to the output of the integrator to control the operation of the gate switch. Also disclosed is a calibration sequence and method for use with an electronic compass which allows for the separation of the vehicle's magnetic field from the earth's magnetic field so that the earth's field can be measured and used to give vehicle direction; such calibration sequence being done with a mirrored 180 degree re-orientation of the vehicle.
516816
Chrysler Motors Corporation
Macrae & Co.
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