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