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Motion and area monitoring system and method

  • US 9,311,793 B2
  • Filed: 10/24/2012
  • Issued: 04/12/2016
  • Est. Priority Date: 10/24/2011
  • Status: Active Grant
First Claim
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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.

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