Electronic analogue compass

Details Electronic analogue compass Electronic analogue compass

1998-11-03

2000-11-07

Hirshfeld, Andrew H.

Geometrical instruments

Indicator of direction of force traversing natural media

Magnetic field responsive

33352, 33355R, G01C 1702, G01C 1728

Patent

active

061418811

ABSTRACT:
An compass having an electronic magnetic field sensor and an analog directional display is disclosed wherein a signal from the field sensor proportional to one component of the earth's magnetic field is alternated in polarity and integrated to produce a triangular waveform the frequency of which is proportional to the strength of that field component and wherein a triangular waveform having a frequency proportional to the second component of the earth's magnetic field is produced in the same manner. These values are used by a microcontroller to control an air-core gauge such that a disk with reference markings attached to the gauge remains positioned with one of the reference markings facing either magnetic or true north. A resistor ladder network is also connected in parallel to the inputs of the integrators and controlled by the microprocessor through a shift register in order keep the integrators out of saturation.

REFERENCES:
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patent: 5255442 (1993-10-01), Schierbeek et al.
patent: 5394029 (1995-02-01), Gay et al.
patent: 5435070 (1995-07-01), Kilian

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