HEADING REFERENCE SYSTEM
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Abstract
A HEADING REFERENCE SYSTEM FOR USE IN A VEHICLE TO COUNTERACT THE DISTORTING EFFECT OF THE METALLIC MASS OF THE VEHICLE BY DETERMINING THE DISTANCE OF THE VEHICLE FROM A PREDETERMINED STARTING POINT, DETERMING ITS DIRECTION OF TRAVEL AND PROVIDING RESOLVER UNITS FOR GENERATING SIGNALS TO COMPENSATE FOR THE PERMANENT MAGNETIC DISTURBANCE EFFECT OF THE EARTH'"'"''"'"'S MAGNETIC FIELD CONCENTRATED IN THE VEHICLE SO THAT HEADING REFERENCE INFORMATION CAN BE OBTAINED AS TO THE PRESENT POSITION AND DIRECTION OF TRAVEL OF THE VEHICLE.
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