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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