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Outdoor automated people counting is essential to the proper management of recreational and protected areas. The authors present a solution for radio-based people counting that employs low-end motes to detect the signature of shadowing events left by humans on the RF signal as they interrupt the line-of-sight path between a radio transmitter and a receiver. Their solution can be implemented with devices with a reduced form factor, requires little computing power, and provides a satisfactory performance at a low energy cost. They illustrate their implementation on TelosB nodes and present an extensive set of results from a real-world deployment.
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