NDLI: The design and evaluation of a hybrid sensor network for Cane-Toad monitoring

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The design and evaluation of a hybrid sensor network for Cane-Toad monitoring

Content Provider	ACM Digital Library
Author	Jha, Sanjay Chou, Chun Tung Hu, Wen Bulusu, Nirupama Tran, Van Nghia Taylor, Andrew
Abstract	This paper investigates a wireless, acoustic sensor network application --- monitoring amphibian populations in the monsoonal woodlands of northern Australia. Our goal is to use automatic recognition of animal vocalizations to census the populations of native frogs and the invasive introduced species, the Cane Toad (see Fig. 1). This is a challenging application because it requires high frequency acoustic sampling, complex signal processing and wide area sensing coverage.We set up two prototypes of wireless sensor networks that recognize vocalizations of up to 9 frog species found in northern Australia. Our first prototype is simple and consists of only resource-rich Stargate devices. Our second prototype is more complex and consists of a hybrid mixture of Stargates and inexpensive, resource-poor Mica2 devices operating in concert. In the hybrid system, the Mica2s are used to collect acoustic samples, and expand the sensor network coverage. The Stargates are used for resource-intensive tasks such as Fast Fourier Transforms (FFTs) and machine learning.The hybrid system incorporates three algorithms designed to account for the sampling, processing and communication bottlenecks of the Mica2s (i) high frequency sampling, (ii) compression and noise reduction, to reduce data transmission by up to 90%, and (iii) sampling scheduling, which exploits the sensor network redundancy to increase the effective sample processing rate.We evaluate the performance of both systems over a range of scenarios, and demonstrate that the feasibility and benefits of a hybrid systems approach justify the additional system complexity.
File Format	PDF
ISBN	0780392027
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2005-04-24
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article

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