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:
03/16/2009
Inventors:
Michael E. Pilcher Jr.; Brian E. Campion; Ben A. Abbott
Full Text: