Inventors:
Jason L. Reene - Holland MI, US
Assignee:
Johnson Controls Technology Company - Holland MI
International Classification:
G06C 17/38, G06F 19/00
Abstract:
A compass system includes a magnetic field sensor for measuring an ambient magnetic field and a magnetic field generator, corresponding to the magnetic field sensor, configured to generate a reference magnetic field. The magnetic field sensor is configured to measure the reference magnetic field. The compass system further includes a control circuit operably connected to the magnetic field sensor and magnetic field generator, wherein the control circuit is configured to process the ambient magnetic field and the reference magnetic field measurements to determine an absolute reference field strength for use in calibrating the compass system.