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Location
information is essential to identify, for example, where
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sensor
readings originated from and to track events and targets
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Location
information has numerous other applications
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support
of context-based routing protocols
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geographic
routing protocols
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location-aware
services
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enhanced
security protection mechanisms
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Many
devices embedded in real-world artifacts, so GPS is not an
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option
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Software-based
solutions explored in WSN world
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Often
require many anchor nodes (nodes with known location) or iterations (or
both)
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to
achieve high accuracy
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Ranging
measurements helpful where available, but not always available or of
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sufficient
accuracy to be useful
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