METHOD FOR OPTIMIZING THE LOCATING ACCURACY OF AN RFID TAG IN AN ULTRA-HIGH FREQUENCY RADIO RANGE IN A SYSTEM FOR LOCATING RFID TAGS COMPRISING A PLURALITY OF READING DEVICES
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United States of America Patent
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Issued Date -
Oct 22, 2015
app pub date -
Mar 19, 2015
filing date -
Apr 16, 2014
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
In a method for optimizing the locating accuracy of an RFID tag in an ultra-high frequency radio range in a system for locating RFID tags in a room comprising a plurality of reading devices, a first step of locating of the RFID tag is initially carried out using methods known from the prior art, whereby for this purpose the RFID tag is detected by at least one reading device. Thereafter cold spots, i.e., points with minimal amplitude, are generated or moved in a targeted fashion in the room using a predetermined variation of the phase position, the frequency and/or the transmission amplitude of the individual reading devices, whereby their location and volume as a function of the phase position, the frequency and the transmission amplitude of the individual reading devices is known by means of simulations and/or measurements. If an RFID tag is no longer detected by any reading device, the same is located in a cold spot, which is identified by means of the first, rough locating of the RFID tag using methods known from the prior art, which allows for accurate locating of the RFID tag.
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