44
2 RFID System Physical Anti-Collision Experimental Verification
the reduction in the number of tags, the tag group performance gradually along with
the reduction in the number of tags, but the tag group of sensitivity value is always
less than the value of the sensitivity of key tag, so when the tag number is greater
than or equal to two, tag, tag is less, the number of tag clouds the worse performance.
At the same time, the sensitivity value of tag group is obtained by distance calculation, and the calculated result is calibrated by using the environmental error value,
and a more accurate value of tag group sensitivity is obtained.
2.1.5 The Summary of This Chapter
Firstly, we put forward the definition of tag group of sensitivity, and carry on the
detailed elaboration, according to the tag of the definition of sensitivity that reverse
tag group read distance are needed to determine tag group of the value of the sensitivity to design and set up a dynamic test system based on photoelectric sensor, the
specific structure of the system and experimental method are introduced. Then, use
the system to complete a single tag read distance test and the calculation of sensitivity, and use the instrument measurement to get the accurate values of the single tag
sensitivity, the sensitivity value calculated according to the distance and the difference of the sensitivity of instrument were measured directly to has carried on the
quantitative interference existing in the environment, the interference value can be
used to calculated value of tag clouds sensitivity calibration. Then, the sensitivity of
tag group was tested, and the effects of seed tags on the performance of tag group
were investigated under three conditions, namely, the change of structure, the change
of sequence, and the change of position of tag group. When the number of multiple
tags is unchanged and the structure is changed, that is, when the key tag is located
at the edge of the tag group, the key tag has the greatest impact on the performance
of the tag group, and when the key tag is located in the middle of the tag group, the
key tag has the least impact on the performance of the tag group. When the number
of multiple tags is unchanged and the order is changed, the position of key tags is
unchanged, while other tag changes have little impact on the performance of tag
group. When the number of tags is unchanged, that is, the performance of the tag
group gradually becomes worse with the decrease of the number of tags, but the
value of the sensitivity of the tag group is always less than the value of the sensitivity
of the key tags. Therefore, when the number of tags is greater than or equal to two,
the fewer the number of tags in the tag group, the worse the performance of the
tag group. Finally, using the designed dynamic test platform to measure the reading
distance of each tag group, the sensitivity value of the tag group is calculated, and
the calculated result is calibrated with the error value.
2 RFID System Physical Anti-Collision Experimental Verification
the reduction in the number of tags, the tag group performance gradually along with
the reduction in the number of tags, but the tag group of sensitivity value is always
less than the value of the sensitivity of key tag, so when the tag number is greater
than or equal to two, tag, tag is less, the number of tag clouds the worse performance.
At the same time, the sensitivity value of tag group is obtained by distance calculation, and the calculated result is calibrated by using the environmental error value,
and a more accurate value of tag group sensitivity is obtained.
2.1.5 The Summary of This Chapter
Firstly, we put forward the definition of tag group of sensitivity, and carry on the
detailed elaboration, according to the tag of the definition of sensitivity that reverse
tag group read distance are needed to determine tag group of the value of the sensitivity to design and set up a dynamic test system based on photoelectric sensor, the
specific structure of the system and experimental method are introduced. Then, use
the system to complete a single tag read distance test and the calculation of sensitivity, and use the instrument measurement to get the accurate values of the single tag
sensitivity, the sensitivity value calculated according to the distance and the difference of the sensitivity of instrument were measured directly to has carried on the
quantitative interference existing in the environment, the interference value can be
used to calculated value of tag clouds sensitivity calibration. Then, the sensitivity of
tag group was tested, and the effects of seed tags on the performance of tag group
were investigated under three conditions, namely, the change of structure, the change
of sequence, and the change of position of tag group. When the number of multiple
tags is unchanged and the structure is changed, that is, when the key tag is located
at the edge of the tag group, the key tag has the greatest impact on the performance
of the tag group, and when the key tag is located in the middle of the tag group, the
key tag has the least impact on the performance of the tag group. When the number
of multiple tags is unchanged and the order is changed, the position of key tags is
unchanged, while other tag changes have little impact on the performance of tag
group. When the number of tags is unchanged, that is, the performance of the tag
group gradually becomes worse with the decrease of the number of tags, but the
value of the sensitivity of the tag group is always less than the value of the sensitivity
of the key tags. Therefore, when the number of tags is greater than or equal to two,
the fewer the number of tags in the tag group, the worse the performance of the
tag group. Finally, using the designed dynamic test platform to measure the reading
distance of each tag group, the sensitivity value of the tag group is calculated, and
the calculated result is calibrated with the error value.