2.1 RFID Tag Group Performance Measurement
35
2.1.3 Single Tag Sensitivity Measurement
In order to obtain the performance of the tags in the real environment, this paper
proposes a test scheme based on the commonly used UHF RFID tags. This study
takes the sensitivity of the tags in the commonly used scenarios as the test target.
The test plan is mainly designed as follows:
(1) Modeling: an experimental model is established for the actual application
scenario, as shown in Fig. 2.2. A test system is designed according to the
application scenario.
(2) Preprocessing of original data: the reading distance of the tag is obtained
through the RFID dynamic test platform based on photoelectric sensor, and
the data records in the experiment process are sorted out. This step becomes
the preprocessing of the original data.
(3) Data analysis: according to the tag group sensitivity defined in Sect. 2.2.1, the
sorted original data were substituted into the sensitivity formula for calculation,
and the environmental error was calibrated with the sensitivity of a single tag
to calculate the value of tag group sensitivity.
(4) Conclusion: the main factors affecting the sensitivity of tag group were
analyzed according to the experimental data.
(1) Test method
(1) Instrument alignment: a reflector plate is placed on the guide rail, and the
laser ranging sensor position is adjusted, so that the laser beam emitted by
the rangefinder can fall vertically on the reflector plate, adjust the horizontal
position of the CCD camera, so that the camera can collect a complete image
of tag arrangement.
(2) Tag placement: attach the RFID tag used in the experiment to the reflector
board, and ensure that the tag and the reflector board fully fit.
(3) Set the experimental conditions: open the software setting part of the test
system, connect the antenna, and set the transmitter power of the reader to 24
dBm, the motion speed of the reflector to 1 m/s, and the number of tags to 1.
After all options are set, click parameter confirmation.
(4) Test: click to start the measurement, start the drive motor, and the reflector plate
starts to move on the guide rail. When the reader detects the tag information,
the laser starts to measure, and the ranging result is displayed on the display
screen, while the CCD completes the collection of the tag image.
(2) Reading distance test
Five kinds of line-polarized tags with different antenna distribution were selected,
and each tag was tested five times in the same test environment, and the average value
of the measurement results was used as the reference result of the reading distance.
In this measurement, the reader power is set to 24 dBm to ensure that each tag is read
in the working range. Because the reading distance of the tag can be used as an index
35
2.1.3 Single Tag Sensitivity Measurement
In order to obtain the performance of the tags in the real environment, this paper
proposes a test scheme based on the commonly used UHF RFID tags. This study
takes the sensitivity of the tags in the commonly used scenarios as the test target.
The test plan is mainly designed as follows:
(1) Modeling: an experimental model is established for the actual application
scenario, as shown in Fig. 2.2. A test system is designed according to the
application scenario.
(2) Preprocessing of original data: the reading distance of the tag is obtained
through the RFID dynamic test platform based on photoelectric sensor, and
the data records in the experiment process are sorted out. This step becomes
the preprocessing of the original data.
(3) Data analysis: according to the tag group sensitivity defined in Sect. 2.2.1, the
sorted original data were substituted into the sensitivity formula for calculation,
and the environmental error was calibrated with the sensitivity of a single tag
to calculate the value of tag group sensitivity.
(4) Conclusion: the main factors affecting the sensitivity of tag group were
analyzed according to the experimental data.
(1) Test method
(1) Instrument alignment: a reflector plate is placed on the guide rail, and the
laser ranging sensor position is adjusted, so that the laser beam emitted by
the rangefinder can fall vertically on the reflector plate, adjust the horizontal
position of the CCD camera, so that the camera can collect a complete image
of tag arrangement.
(2) Tag placement: attach the RFID tag used in the experiment to the reflector
board, and ensure that the tag and the reflector board fully fit.
(3) Set the experimental conditions: open the software setting part of the test
system, connect the antenna, and set the transmitter power of the reader to 24
dBm, the motion speed of the reflector to 1 m/s, and the number of tags to 1.
After all options are set, click parameter confirmation.
(4) Test: click to start the measurement, start the drive motor, and the reflector plate
starts to move on the guide rail. When the reader detects the tag information,
the laser starts to measure, and the ranging result is displayed on the display
screen, while the CCD completes the collection of the tag image.
(2) Reading distance test
Five kinds of line-polarized tags with different antenna distribution were selected,
and each tag was tested five times in the same test environment, and the average value
of the measurement results was used as the reference result of the reading distance.
In this measurement, the reader power is set to 24 dBm to ensure that each tag is read
in the working range. Because the reading distance of the tag can be used as an index