Patent Number: 7,826,999

Title: Magnetic tilt compensated heading compass with adaptive zoffset

Abstract: The instant invention utilizes two, optionally orthogonal and optionally slightly tilted, horizontal magnetic sensors and, optionally, a 2 or 3 axis accelerometer or inclinometer to calculate a pitch, roll and tilt compensated heading. A vertical, Z, component is relatively constant compared to X and Y components, the Z component can be abstracted from the X and Y sensor when pitch and roll is applied based on Z offset measured with X or Y sensor at high tilt angles. Additional sensors tilted at various .theta. degrees can be added with a different angle .alpha. to X sensors when additional horizontal and magnetic coverage is desirable.

Inventors: Boeen; Anders (San Rafael, CA), Taylor; Andrew T. (Santa Rosa, CA), Figaro; Davy J. (Sebastopol, CA)

Assignee: PNI Corporation

International Classification: G01C 17/02 (20060101); G06F 17/40 (20060101)

Expiration Date: 2019-11-02 0:00:00