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Their low cost and wireless communication capability make it feasible to deploy them in large numbers, and without preexisting infrastructure. With more sensors available in the environment, it is more likely that phenomena of interest are near some sensors, there by leading to the main appeal of wireless sensors compared to the tethered ones. On the other hand, such sensors relay on limited sources of power, and so energy efficiency becomes an important feature of the systems that use them. Tracking consists of detecting and monitoring locations of real-world objects, possibly numerous applications of tracking are currently in use; for example, air traffic control, fleet tracking, monitoring, mobile telephony, etc.
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