Patent ID: 6052181
Filing Date: 2000-04-18
Classification: G01C

Abstract:
A multiple-laser elevation-reference system, comprising:a plurality of light beacons that each generate a reference-plane of laser light over a job site area by rotating a laser light source;a signal system associated with a particular one of the plurality of light beacons, and providing for the detection of when a corresponding said laser light source is rotated past a reference direction, and further providing for a communication signal to be transmitted that includes information related to when said laser light source was rotated past said reference direction;a mobile unit for operation on said job site area and having a light detector for intercepting and sensing said laser light source; anda receiver mounted to the mobile unit and providing for reception of said communication signal;wherein, the signal system modulates at least one laser light source and uses meteor burst communication technology to transfer information from a light beacon to a mobile unit during a brief time a communication contact exists.