3.2 Electromagnetism Analysis of Physical Anti-Collision …
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RFID tags, we chose 7 heights. The data is shown in Table 3.4. According to the
reading distance and reading rate, the RFID tag height of 1 m was selected in the
experiment.
Tag’s reading distance is measured in 41 different humidity ranges from 35 to 75%.
Data of the experimental reading range and theoretical curve for each humidity is
shown in Fig. 3.13. In Fig. 3.13, the vertical coordinate represents the reading range of
the tag and the horizontal coordinate represents the test humidity. The stars represent
Table 3.4 Experimental data of the RFID tag height from ground
Height/m
Antenna
power/dBm
Average reading
distance/m
Test times
Successful
readings
Read rate/%
0.7
28
6.153
10
9
90
0.8
28
7.4051
10
10
100
0.9
28
4.78
10
8
80
1.0
28
12.977
10
10
100
1.1
28
3.485
10
10
100
1.2
28
2.465
10
9
90
1.3
28
11.8924
10
10
100
Table 3.5 Evaluation index
of the model
R-square
0.9406
Average error
4.13%
Fig. 3.13 Experimental data of the test humidity and theoretical curve