Digital compass and magnetometer having a sensor coil wound on a high permeability isotropic core
US4851775A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 2, 1987 |
| Grant date | Jul 25, 1989 |
| Priority date | — |
| Expiry date | Jul 2, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C17/28
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A digital compass (20) has a sensing coil (60) wound on an elongated strip of high direct current permeability magnetic material. The sensing coil (60) is connected to a sensing circuit (56). The sensing coil and sensing circuit are responsive to the Earth's magnetic field to provide an oscillating signal at an output (28) of the sensing circuit (56) which varies in frequency with orientation of the at least one sensing coil (60) with respect to the Earth's magnetic field. A microprocessor (36) is connected to receive information inputs from the oscillating signal. The microprocessor converts the information inputs to an indication of orientation of the sensing coil with respect to the Earth's magnetic field based on the frequency of the oscillating signal. A display (52) receives the orientation indication from the microprocessor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.