Patent ID: 9213092
Filing Date: 2015-12-15
Classification: G01S

Abstract:
1. A system for detecting a change in position of at least one object within an at least partially enclosed space, the system comprising: at least one stationary transmitter repeatedly producing at least two mutually distinguishable standing waves in said at least partially enclosed space at mutually exclusive and mutually alternating times; at least one stationary receiver receiving reflected energy of said at least two mutually distinguishable standing waves, said reflected energy from said at least two mutually distinguishable standing waves having mutually different amplitudes which have a difference therebetween; and a computerized processor receiving outputs from said at least one stationary receiver, said outputs corresponding to said received reflected energy of said at least two mutually distinguishable standing waves, and calculating changes in said difference between said mutually different amplitudes, said changes in said difference between said mutually different amplitudes indicating said change in position of said at least one object.