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System and method for detecting movement of a mobile asset and controlling operations of the asset based on its movement

  • US 9,841,490 B1
  • Filed: 01/17/2017
  • Issued: 12/12/2017
  • Est. Priority Date: 01/17/2017
  • Status: Active Grant
First Claim
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1. A system for detecting direction of movement, the system comprising:

  • a first radio frequency identification (RFID) reader arranged in a first location, the first RFID reader being configured to transmit a first location signal from the first location, and to receive a first response signal from a portable electronic device when the portable electronic device is within range of the first location to receive the first location signal;

    a second RFID reader arranged in a second location distinct from the first location, the second RFID reader being configured to transmit a second location signal from the second location, and to receive a second response signal from the portable electronic device when the portable electronic device is within range of the second location to receive the second location signal; and

    a controller configured to determine whether the first and second response signals received by the first and second RFID readers respectively satisfy a predetermined condition at a first time and a second time subsequent to the first time, and to determine a direction of movement of the portable electronic device relative to the first and second locations during the first and second times based on whether the first and second response signals respectively satisfy the predetermined condition at the first and second times,wherein the first RFID reader comprises a first power measurement unit configured to measure power present in the first response signal received by the first RFID reader, a first control unit configured to generate a first received signal strength indicator (RSSI) signal indicating the measured power in the first response signal, and a first transceiver configured to transmit the first RSSI signal to the controller when the first RFID reader receives the first response signal,wherein the second RFID reader comprises a second power measurement unit configured to measure power in the second response signal received by the second RFID reader, a second control unit configured to generate a second RSSI signal indicating the measured power in the second response signal, and a second transceiver configured to transmit the second RSSI signal to the controller when the second RFID reader receives the second response signal, andwherein the controller is configured to determine an amount of power present in the first response signal based on the first RSSI signal received from the first RFID reader, and to determine an amount of power present in the second response signal based on the second RSSI signal received from the second RFID reader.

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