Electronic digital compass

Details Electronic digital compass Electronic digital compass

G - Physics

01

C

354/25, 324/48,

G01C 17/28 (2006.01) G01R 33/02 (2006.01)

Patent

CA 1308551

ABSTRACT An electronic digital compass utilizes an amorphous magnetostrictive wire 100 exhibiting reentrant behavior as a core. A sense winding 104 is wrapped about the core and the core is driven with a triangular wave through a drive coil 102. The earth's magnetic field biases the core 100 such that when the core 100 is driven to reentrant jumps the time duration between adjacent pulses induced into the sense winding 104 is related to the heading. A pair of such arrangements are used in physical 90 degree relationship to resolve ambiguities in heading angle. The resulting heading angle calculation is a true digital product which is independent of analog amplitude variations and requires little or no adjustment for high accuracy.

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