14 RFID Tags, GPS Tags, and Ultrasonic Tags Used in Ecological Research
14.1 INTRODUCTION
Radio-frequency identification (RFID) tags, along with optical barcodes, allow our complex society to identify, track, sort, locate, and price goods, as well as identify animals and even people. An RFID system consists of the following: (1) a class of objects to be identified (e.g., cattle, pets, books, shipping containers, controlled substances), (2) the physical tags (which can be classified as either active (self-powered), or passive), and (3) a tag-reading system (basically a radio transmitter/receiver with an RF output link to a computer that compiles ...
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