Mitigating adjacent RFID reader interference

A reader, signal interference technology, applied in the field of radio frequency transceivers and interference reduction, can solve the problems of not allowing RFID readers, expensive, etc., and achieve the effect of reducing complexity and high efficiency

Inactive Publication Date: 2016-07-27
纽奥奇公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

None of these methods allow the RFID reader to operate in a free-running mode as opposed to a time-division multiplexing mode without modifying the RFID tag, the specific implementation of which can be expensive to implement on a large scale

Method used

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  • Mitigating adjacent RFID reader interference
  • Mitigating adjacent RFID reader interference
  • Mitigating adjacent RFID reader interference

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0039] Test Methods

[0040] read count : Each tag was read for a total time of 30 seconds, and the number of cumulative readings is shown in Table 1 below.

[0041] Combined Effective Read Rate : The combined effective read rate is measured by the 3M Reader Test Tool via the "Cumulative Rate" scale. The tool generates measurements based on tag readings for a fixed period of time, while displaying the total number of readings and the effective read rate for that period of time. The effective read rate is calculated by dividing the total number of readings accumulated during the time period by the duration of the time period. The results are reported in Table 1 below.

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PUM

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Abstract

The invention discloses a radio frequency identification (RFID) automatic vehicle identification (AVI) system configured to mitigate signal interference, the system comprising a plurality of RFID readers, comprising a first RFID reader and a second RFID reader; and a plurality of antennas, wherein a first antenna is connected to the first RFID reader and a second antenna is connected to the second RFID reader. Prior to the first RFID reader transmitting a signal through the first antenna, the first RFID reader samples a received radio frequency (RF) signal from the first antenna, and if the received RF signal meets predetermined strength and frequency criteria, the first RFID reader inhibits transmission of the signal through the first antenna.

Description

technical field [0001] This application relates to the field of radio frequency transceivers and interference reduction. In particular, the present application relates to preventing signals from being transmitted by radio frequency identification (RFID) transceivers or RFID readers in order to reduce interference of adjacent transceivers in the case of automatic vehicle identification (AVI) charging. Background technique [0002] Radio frequency (RF) and RFID readers are used in many cases to detect the presence of an item with an RFID tag or a transponder attached to the item. Examples include tracking assets in warehouses and detecting the presence of cars driving along roads for toll collection purposes. In many examples, multiple RFID readers are used to be able to detect the presence of these items over a large physical area. However, antennas from multiple readers can generate overlapping fields when transmitting interrogation signals, creating interference among the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K7/10
CPCG06K7/10356H04B5/0062G06K19/0724
Inventor 乔治·D·克鲁克香克斯大卫·R·米西莫克里斯托弗·J·霍普金斯史蒂文·C·林托马斯·J·弗雷德里克
Owner 纽奥奇公司
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