Importance

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Abstract

A system which enables the orientation of a device in a specified environment to be determined in relation to a plurality of sensing receivers positioned at known points in or around the specified environment. A directional transmission from a directional transmitter which forms part of a known face of the device is initiated by a trigger signal from a timing transmitter located so as to cause transmitted bursts of energy to enter the environment. Associated with the directional transmitter having is a timing receiver adapted to respond to any such trigger signals, to thereby initiate the directional transmission. At the beginning of a timeslot, the sensing receivers are reset, and the trigger signal is transmitted, to render the receivers ready to receive the directional transmission. A control system determines the direction in which the directional transmitter is facing as a function of an identification of those of the sensing receivers on which the directional transmission was incident within the timeslot.

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First Claim