Patent ID: 9311793
Filing Date: 2016-04-12
CPC Classification: G08B

Claim Text:
1. A method of detecting motion using a transceiver and a base station, comprising the steps of: entering a ground state of beginning motion detection, wherein a first and second signal emitters are activated; transmitting a first transmission signal from said first emitter and a second first transmission signal from said second emitter; receiving a initial first set of return signals, comprising a first and second return signal with a receiver, wherein said signals are reflected from an object in front of at least one of said first or second emitter; calculating a difference between a signal strength of said first set of return signals and second return signals against a signal strength of a first and second predetermined threshold signal; determining whether a foreign object is present based on said difference calculation; entering another an operational state based on said determination of the presence of said foreign object; if said signal strength of said first set of return signals exceeds said signal strength of said first and second predetermined threshold signal, calculating a difference between a signal strength of said first return signal of said first set of return signals and a signal strength of said second return signal of said first set of return signals; transmitting a second transmission signal from said first emitter and a second transmission signal from said second emitter; receiving a second set of return signals, comprising a first and second return signal with a receiver, wherein said signals are reflected from an object in front of at least one of said first or second emitter; calculating a difference between a signal strength of a first return signal of said second set of return signals and a signal strength of a second return signal of said second set of return signals; determining a movement of said foreign object based on comparing said signal strengths of said first set of return signals and said signal strengths of said second set of return signals.