Patent ID: 6459483
Filing Date: 2002-10-01
Classification: G01B,G01C

Abstract:
A system comprising:a laser leveling system base unit; and a target, wherein said laser leveling system base unit includes: a transmitter for transmitting a signal toward said target, a receiver to receive said corresponding signal from said target, a phase detector coupled to said receiver to receive said corresponding signal, wherein said phase detector detects phase difference between a phase of said signal transmitted by said transmitter and said corresponding signal, and a processing unit coupled to said phase detector to receive detected phase differences, wherein said processing unit determines a distance from said base unit to said target in response to said phase differences, wherein said target includes: an input adapted to receive said signal transmitted by said transmitter, and a transponder coupled to said input to receive said signal transmitted by said transmitter and transmit a corresponding signal to said base unit.