1756-M16SE,AB,1756-M16SE

1756-M16SE,AB,1756-M16SE

RFID在WSN的应用

　　RFID（Radio Frequency IDentification；无线射频辨识）系统，目前被广泛应用在生活上。其原理主要是由电子标签（Tag）、读取器（Reader）组成，当读卡机与RFID Tag在近距离感应之后，搭配后台应用系统（Application），即可快速辨识其ID，并做为各种应用。像是物流管理、各场所的门禁卡、悠游卡、电子票券、动物晶片、以及高速公路电子收费（eTag）等等，这些大多采用被动式RFID技术，标签不须内建电池，只须在设定距离内与读取器感应到，即可通电并进行资料读取与运算。

　　至于主动式RFID技术，则是标签本身具备电池，感应距离长，记忆体较大且可读写，可主动侦测周遭的RFID读卡机，将资料传过去。由于主动式RFID能在周围形成有效的活动区域，因此应用范围更广泛。例如应用在室内定位上，在GPS接收不到的室内场所，提供定位需求。若在室内环境密集部署各种RFID的读卡机、辨识机，即可发挥在人员定位、车辆管控、物品追踪等应用。不过，主动式RFID其标签体积比较大，电池有寿命限制，且成本也较高。

　　目前RFID大多仅有单纯的识别，并没有内建任何感测器。除非特殊应用（例如*的RFID标签，就内建可随时侦测温度的温度计），而也有厂商开发出以RFID为基础的WSN感测网路，采用1对1的感应方式，应用在非环境感测的管控场所，如公司、工厂、医院等等。亦有学者提出RFID+WSN的Hybrid（混合型）整合方案，在同样必须布下天罗地网的WSN感测节点或感测闸道器中，也内建RFID读取器，这样就不用部署两次。除了可以进行环境感测之用，也能同时管控人员或物品出入，一举两得。

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