Mobility

Quality Tradeoffs in Object Tracking With Duty-Cycled Sensor Networks

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Executive Summary

Extending the lifetime of wireless sensor networks requires energy-conserving operations such as duty-cycling. However, such operations may impact the effectiveness of high-fidelity real-time sensing tasks, such as object tracking, which require high accuracy and short response times. In this paper, the authors quantify the influence of different duty-cycle schemes on the efficiency of bearings-only object tracking. Specifically, the authors use the Maximum Likelihood localization technique to analyze the accuracy limits of object location estimates under different response latencies considering variable network density and duty-cycle parameters. Moreover, they study the tradeoffs between accuracy and response latency under various scenarios and motion patterns of the object.

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