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Abstract
AN ELECTROMAGNETIC SENSOR IS HELD IN SPACED RELATION TO A GRID NETWORK HAVING A PLURALITY OF CONDUCTORS DEFINING A GRAY CODE PATTERN. EACH OF THE CONDUCTORS CORRESPONDS TO A BIT IN THE GRAY CODE, THE GRID NETWORK CHARACTERIZED BY DIFFERENNCES WHICH CORRESPOND TO THE DIFFERENCES IN THE BITS OF THE GRAY CODE. AS CURRENT IS PASSED SEQUENTIALLY THROUGH EACH OF THE CONDUCTORS, A VOLTAGE IS INDUCED IN THE SENSOR. THE LOCATION OF THE SENSOR WITH RESPECT TO THE GRID NETWORK IS DETERMINED BY DETECTING THE PHASE OF THE VOLTAGE INDUCED IN THE SENOR.
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