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Wireless Sensor Node Data Gathering and Location Mapping
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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With advances in wireless communications and miniaturization of mobile sensors, Wireless Sensor Nodes are increasingly being deployed in Ad Hoc fashions. Efficiently gathering data from the networks now becomes a larger problem. Collecting sensor data from a group of nodes deployed in an unknown arrangement in the shortest amount of time requires the collector to utilize a methodology that minimizes collection overlap. Inexpensive commercial off-the-shelf wireless routers and mobile platforms that can be utilized to fly over a field of wireless nodes and create a link connecting to and retrieving the maximum amount of data, are examined in this thesis. The problems are two-fold first, the necessary task of locating the wireless devices in a given area, querying these devices to collect raw data for positioning, and second, the task of then creating a static map of derived locations. In order to enumerate device locations, the relationship of signal strength measurements and round trip signal times between wireless nodes and the wireless access router were investigated in this thesis. The results of this research support the conclusion that an inexpensive collection system can be readily configured for the task of automated client surveying and distance approximation.
APPROVED FOR PUBLIC RELEASE