Installation and evaluation of rfid readers on moving vehicles

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Installation and evaluation of RFID readers on moving vehicles 評估對行駛中的車裝置 RFID 讀取器學生：楊鴻志

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RFID 使用頻率為避免各國無線電頻率使用標準不一，造成使用上的混亂與困擾，國際上大多遵守國際電信聯合會（ ITU ）的規範。表 RFID 頻譜比較分析表資料來源： Forrester Research, Inc. 頻率優點缺點應用範圍低頻 (9-135Khz) 1. 此頻段在絕大多數的國家屬於開放，不涉及法規開放和執照申請的問題。讀取範圍受限制 ( 在 1.5 公尺內 ) 1. 畜牧或寵物的管理。 2. 門禁管理、防盜系統。高頻 (13.56Mhz) 1. 高接受度的頻段 2. 在絕大多數的環境都能正常運行 1. 在金屬物品附近無法正常運作 2. 讀取範圍在 1.5 公尺左右 1. 圖書館管理 2. 貨版追蹤 3. 大樓識別証 4. 航空行李標籤或電子機票超高頻 (300-1200Mhz) ,[object Object],[object Object],1. 此頻段在日本不允許作為商業用途 2. 頻率太相近時會產生同頻干擾 3. 在陰濕的環境下會影響系統運作 1. 工廠的物料清點系統 2. 卡車與拖車的追蹤微波 (2.45 或 5.8Gzh) 超過 1.5 公尺的取範圍 1. 此頻段在某些歐洲國家不允許作為商業用途 2. 複雜的系統開發流程 3. 在先今環境不被廣泛使用高速公路收費系統

[object Object],[object Object],[object Object],[object Object],[object Object],Test 1 is considered to evaluate the RFID read rate in the straightforward conﬁguration: a single reader antenna and a single tag. The tags are placed at 2m interval and the test vehicle travels at the maximum speed of 100km/h. Theresult is compared to that from Test 2 to see the e ﬀ ect of dual RFID reader antennas, as summarized in Figure 14.

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[object Object],[object Object],[object Object],[object Object],[object Object],With dual RFID reader antennas, we vary the number of member tags in the interval, i.e. Test 2 to Test 6. The results are shown in Figure 15. The low number of duplication read is highly connected to performance as shown in Figure 15(b).

[object Object],We presented performance issue of an RFID system in a vehicular environment. e.g. the random tag pause time, is one critical factor inﬂuencing the RFID read performance. A long pause time helps prevent RFID tags from collision. On the other hand,it could degrade RFID performance in time sensitive vehicular applications that require very short read latency ,[object Object],[object Object],[object Object],[object Object]

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