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In this paper, we present a distributed location discovery frame-
work, called Sextant, that extracts geographic constraints fromalready-
present wireless radios and uses these constraints to infer node and
event location with high accuracy. Sextant operates by setting up
a system of relative geographic constraints among the network par-
ticipants based on network connectivity and solving this system in
a distributed and efficient manner with the aid of absolute position
information provided by a small number of landmarks. A landmark
is a node whose absolute position is known; Sextant landmarks can
be cheap static nodes whose positions are fixed, or they may be mo-
bile nodes equipped with dedicated hardware,...
Nội dung trích xuất từ tài liệu:
The Joint Commission Sentinel Event Alert
