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<p>Location awareness is invaluable to the military commander. Any application  that can accurately deliver this service is highly desirable. Being able to extract accurate  distances is the first step towards developing a proposed 802.11 local area positioning  system. This thesis explores a number of different methods of using 802.11 to capture  physical distance separation between mobile stations. The first method of measuring  distance, involves using 802.11 round trip signal times. Round trip signal times are  determined from a transmitter to a receiver and back, and are used with the speed of light  to measure distance between the nodes. Another method of using 802.11 to measure  distance involves using signal strength measurements and a client-server arrangement.  Distances can be extracted by extrapolating through a range of signal strength  measurements. Because signal strength is a measurement of power, its behavior is  governed by the inverse-square law. If environmental variables, such as humidity and RF  interference do not significantly change, a line graph of signal strength measurements  versus distance can be used to determine positions under these constant conditions.
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<br>Subjects: Command and control systems; IEEE 80211 (Standard)</div>
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Bangalan, Rolan T.</div>
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