E-systems, Inc.

Harley D Peter

Fred M Gore

Robert P Benjamin

David D Williams

Richard D Miller

Vehicle data terminal

A timing circuit receives substantially square wave clock signals and generates Sine and Cosine driving signals therefrom at a predetermined frequency for application to first and second mutually perpendicular Hall effect generators. The output signals from the Hall effect generators are algebraically summed to provide a heading signal, the phase displacement of which with respect to the driving signals, is representative of the orientation angle between one of the Hall effect generators and magnetic north. A counter is synchronized to begin to count clock pulses at the beginning of each period of the driving signals. A logic circuit is effective to disable the counter when the count therein is representative of the orientation angle. The count is stored in a memory and displayed on a readout device which is, in turn, updated at the end of each period of the driving signals' frequency.

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Dallas, TX, United States of America

Harley D Peter