Electronic compass with direction signal compensation - employs common software in manual and automatic modes using maxima and minima of orthogonal pick=up voltages

A flux-gate magnetometer (30) having a high-permeability toroidal core, and two outer pick-up windings (32A,32B) inclined at 45 deg. to the direction of travel, is driven (35,37) by a microprocessor (50) which processes signals from wideband amplifiers (39A,39B), synchronous demodulators (41A,41B) a...

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Bibliographische Detailangaben
Hauptverfasser:	BLANEY, PETER G., DANVILLE, CALIF., US, ESMER, GERALD P., HOLLY, MICH., US
Format:	Patent
Sprache:	eng ; ger
Schlagworte:	ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS INVEHICLES ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OFTRANSMISSIONS IN VEHICLES ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GASEXHAUST OR FUEL SUPPLY OF PROPULSION UNITS, IN VEHICLES AUXILIARY DRIVES FOR VEHICLES GYROSCOPIC INSTRUMENTS INSTRUMENTATION OR DASHBOARDS FOR VEHICLES MEASURING MEASURING DISTANCES, LEVELS OR BEARINGS NAVIGATION PERFORMING OPERATIONS PHOTOGRAMMETRY OR VIDEOGRAMMETRY PHYSICS SURVEYING TESTING TRANSPORTING VEHICLES IN GENERAL
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Beschreibung
Zusammenfassung:	A flux-gate magnetometer (30) having a high-permeability toroidal core, and two outer pick-up windings (32A,32B) inclined at 45 deg. to the direction of travel, is driven (35,37) by a microprocessor (50) which processes signals from wideband amplifiers (39A,39B), synchronous demodulators (41A,41B) and comparators (42A,42B). Feedback is applied to the two pick-up windings (32A,32B) via PWM digital-to-analogue converters (44A,44B). Alphanumeric, analogue and mechanical indicators (58-60) are driven by separate outputs (55-57). USE/ADVANTAGE - In vehicles ranging over extensive territories where geomagnetic North deviates widely from true North. Highly accurate compensation is achievable without need to drive deliberately around circular route.