Sensor+Networks

Sensor+Networks - Instrumentation of the Planet: Smart Mesh...

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Instrumentation of the Planet: Smart Mesh Networks CJ Quinn Colin Lehman Alvin Yan Tonya Dugger Wednesday, November 3rd, 2010 MGT 3743 - Emerging Technologies Agenda 1. Mesh Networks Overview 2. TrafFc Sensor Application 3. ±uture of Mesh Networks Defnition A network where each node acts as an independent router and can connect to each other via multiple paths , regardless of whether it is connected to another network or not. General InFormation Dynamic routing algorithms Wireless ±requency • 2.4 GHz, 5.2 GHz, or 5.8 GHz Signal Strength • Proportional to the size oF the network Management • Centralized or decentralized Power • Many diFFerent options • Can also use the nodes to power other devices
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Importance Inexpensive Reliable Scalable Adaptable Relatively easy to operate Uses Municipal • Currently 38 U.S. cities have citywide municipal wireless networks • 164 more currently being set up Military • Communication Home • Z-Wave Sensys Networks • Roads Application The Challenge Worldwide, population growth, urbanization, and motorization continue to strain overburdened roadways. This inability to manage mobility—especially at peak hours—impacts travel time , fuel consumption, and air quality. TrafFc Congestion
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The Inductive Loop An inductive loop is simply a coil of wire embedded in the road's surface. To install the loop, they lay the asphalt and then come back and cut a groove in the asphalt with a saw. The wire is placed in the groove and sealed with a rubbery compound. Inductive loops work by detecting a change of inductance. Inductive Loop Shortcomings Time and difFculty of installation (involving up to a dozen saw cuts) ±itting the loop to the cuts without crimping or nicks Changes to inductance caused by the environment Vehicle's offset in a lane, which adversely affects repeatability Vehicles with large differences in inductance Vehicles changing lanes The Opportunity As equipment failures, weather, and calibration issues continue to plague present-day trafFc management systems, the need for
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Sensor+Networks - Instrumentation of the Planet: Smart Mesh...

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