Geometrical instruments – Indicator of direction of force traversing natural media – Magnetic field responsive
Patent
1985-12-18
1987-02-03
Little, Willis
Geometrical instruments
Indicator of direction of force traversing natural media
Magnetic field responsive
33363Q, G01C 1738
Patent
active
046400168
ABSTRACT:
A remote indication compass, a sensor of which is formed by a magnetic compass (1) and magnetoresistive sensors (2) attached thereto, by means of which sensors the field created by the magnetic compass is measured. The signal of the sensors is analogous as well as cyclic with respect to the angle between the fastening plate of the sensors and the northern direction indicated by the magnetic compass, the length of a cycle being 360.degree.. The angle between the sensors is selected in such a manner that the flat areas of the signals do not coincide.
The sensor signals are amplified and digitalized and scaled. The determination of direction is carried out by comparing the sensor readings to tabulated sensor readings corresponding to different directions or alternatively by comparing the ratio of the sensor readings to the ratios of the tabulated sensor readings. The direction data so obtained is further corrected by means of a deviation correction table created in the operating condition and stored in a memory.
REFERENCES:
patent: 4232451 (1980-11-01), Thomsen
patent: 4445279 (1984-05-01), Tsushima et al.
Purhonen Hannu
Tanner Risto
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