文档介绍：WirelessWireless SensorSensor
works (WSNs)(WSNs)
Technological Revolution
1. working 1990
LAN
2. munications 2000
GSM/UMTS
WLAN
3. Wireless Sensing Technologies 2010
MEMS Technology
WSNs
2005 Prof. I Stavrakakis 2
Applications for Wireless
works
o MilitaryMilitary ApplicationsApplications
(monitoring friendly forces, monitoring equipment,
battlefield surveillance, reconnaissance of opposing
forces and terrain)
o EnvironmentalEnvironmental MonitoringMonitoring
(flood/forest fire detection, space exploration, biological
attack detection)
mercial ApplicationsApplications
(home/office smart environments, health applications.
environmental control in buildings)
o TrackingTracking
(targeting in intelligent ammunition, tracking of doctors
and patients inside a hospital)
2005 Prof. I Stavrakakis 3
Application Examples
2005 Prof. I Stavrakakis 4
WSN Model Terminology
1. SensorsSensors
Make discrete, local samples (measurements) of the
phenomenon
Communicate over wireless medium, forming a
wireless work
Disseminate information about the phenomenon to
the observer
2. ObserverObserver
Is interested in measuring/ monitoring the
behaviour of a phenomenon
Accepts measurements under specific performance
requirements (accuracy or delay)
3. PhenomenonPhenomenon
Entity of interest to the observer
2005 Prof. I Stavrakakis 5
System Architecture
Cheap, low-power, tiny
sensors used in
thousands
WSN Communication with
the use of miniaturized
SINK wireless transceivers
,
Satellite, Data aggregation
etc. during data
propagation or at the
sink
WSN Unattended operation
SIN
K of the work
Sink transmits data to
USER the end-user at the
other end of the world
2005 Prof. I Stavrakakis 6
Sensors Hardware Platform
Location Finding System Mobilizer Node
characteristics
• Tiny size
• Low power
Sensor,
CPU, Digital
Real worl