×

Method for determining the sequence of vehicle tagged with and without RFID

  • US 9,024,789 B2
  • Filed: 12/14/2011
  • Issued: 05/05/2015
  • Est. Priority Date: 12/21/2010
  • Status: Expired due to Fees
First Claim
Patent Images

1. A method for determining the sequence of vehicle tagged with and without an RFID (radio-frequency identification), the method comprising:

  • f1 . carrying out multiple receiving and transmitting communications with an RFID tag in a read-write region via an RFID reader-writer, and recording success and failure operations in a time sequence;

    f2. setting a time window, moving the time window from left to right on a time axis, and adding the success times of the receiving and transmitting communications recorded in the step f1 in the time window to obtain a curve a;

    f3. detecting vehicles in a read-write region by using a ground induction coil to obtain a curve b;

    f4. when detecting a square wave in the curve b, indicating that there is at least one vehicle driving through the coil, judging whether the driven through vehicle is installed with an RFID tag according to the wave time relationship between the curve a and the curve b, and judging whether there is a vehicle with and/or without an RFID tag among the vehicles with RFID tags driving through, according to the matching degree of the vehicle speed calculated by the curve a and the curve b;

    the judging time being from a falling edge of the curve b as a starting point to backtrack to the previous falling edge, the judging method being;

    if the curve a has no pulse matching the set conditions, it is judged that one or more vehicles without the RFID had driven through;

    there is required a manual work or other technical process to determine the total number of the vehicles and the orders;

    if the curve a has one pulse matched the set conditions, and it is detected by the induction coil, the vehicle speed is obtained by the curve b, which is defined as a first speed;

    it is read and written by the RFID, the speed is obtained by the curve a, which is defined as a second speed;

    if the first speed is equal to the second speed within a certain range, it is judged that a vehicle with the RFID drives through;

    when the first speed is not equal to the second speed in the certain range, it is judged that one vehicle with the RFID and at least one vehicle without the RFID drive through;

    it is needed manual or other technical process to determine the total number of the vehicles and the orders;

    if the curve a has two pulses matched the set conditions, when the first speed is equal to the second speed in the certain range, it is judged that two vehicles with the RFIDs drive through;

    when the first speed is not equal to the second speed in the certain range, it is judged that two vehicles with the RFIDs and at least one vehicle without the RFID drive through;

    it requires manual or other technical process to determine the total number of the vehicles and the orders;

    if the curve a has n (n>

    2) pulses matched the set conditions, when the first speed is equal to the second speed in the certain range, it is judged that n vehicles with the RFIDs drive through;

    when the first speed is not equal to the second speed in the certain range, it is judged that n vehicles with the RFIDs and at least one vehicle without the RFID drive through;

    it requires manual or other technical process to determine the total number of the vehicles and the order.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×