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Wireless System Using Continuous Wave Phase Measurement for High-Precision Distance Measurement

Abstract: 

A system and method for monitoring topological changes in a defined area. A grid of sensors is arranged in the area, with known distances between them. The sensors communicate wirelessly with a host computer, which individually addresses each sensor to instruct that sensor to be in an interrogate mode or responder mode. When a sensor is in interrogate mode, it measures distance from a neighboring sensor using radar (continuous wave phase difference) measurements. When a sensor is in responder mode, it receives, delays, and returns a signal received from a neighboring sensor.

Patent Number: 
7,504,992
Date Of Issue: 
03/17/2009
Inventors: 

Michael E. Pilcher Jr.; Brian E. Campion; Ben A. Abbott