Motion/vibration detection system and method with self-injection locking

  • US 9,603,555 B2
  • Filed: 01/14/2014
  • Issued: 03/28/2017
  • Est. Priority Date: 05/17/2010
  • Status: Active Grant
First Claim
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1. A motion/vibration detection system, comprising:

  • at least one transmitter, the at least one transmitter comprising a transmit/receive antenna unit and a first oscillator unit; and

    at least one receiver, comprising a receiving unit and a demodulation unit;

    wherein,the transmit/receive antenna unit is coupled to or electrically connected to a signal output port of the first oscillator unit, receives an output signal from the first oscillator unit and transmits a detection signal;

    the detection signal is reflected from at least one object as a reflected detection signal, which is received by the transmit/receive antenna unit;

    the transmit/receive antenna unit injects the reflected detection signal, as an injection signal, into the first oscillator unit and accordingly the first oscillator unit is under a self-injection locking mode;

    the receiving unit is coupled to or electrically connected to the demodulation unit and receives the detection signal; and

    the demodulation unit demodulates the detection signal received by the receiving unit into a baseband output signal, to extract at least one motion/vibration information of the at least one object.

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