Deployable Wireless Sensor Networks

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Deployable Wireless Sensor Networks Powered By Docstoc
					              Deployable
Wireless Sensor Networks for Surveillance

                  Gurminder Singh
                       NPS/CS
                Center for the Study of
         Mobile Devices and Communications

   International Maritime Protection Symp. 2005
                      12/13/05
  WSNs – Extreme Computing
• WSNs consist of a large number of
     • small,
     • low-powered and
     • multi-function sensors nodes that are
  – able to
     • sense,
     • process and
     • communicate through collaborative efforts.
       Desired Characteristics
• Low cost
• Ease of installation
• Self-identification
• Self-diagnostics
• Reliability
• Time awareness for co-ordination with other
  nodes
• Signal processing and
• Standard control protocol and network interfaces
                          WSN for Surveillance
                                      Airborne Network




                                                                GPS Enabled
                                                                TactiComp


 Capability Discovery
Resource Aggregation                        Sensor Network
      Adhoc 802.11b                         802.15.4/Zigbee



                                                              802.15.4/ZigBee
                        SmartRock
                                                               802.11b Adhoc
                                                               UAV 802.11
                                                                Iridium
                                                              Airborne Network
       Deployment Challenges
•   Wireless
•   Sensor
•   Network
•   And, the whole deal…
Deployment Challenges - Wireless
• Transmission Medium
   – Vegetation vs desert
   – High vs low humidity etc
• Coverage
   – What is the range of the mote?
   – Break vs Re-associate distance
• Connectivity
   – How stable is the connection?
   – How is it affected by the change in battery voltage?
• Power consumption
   – How much power does the radio use?
   – What happens when the voltage drops?
   Battery Voltage vs. Break & Re-
associate Distance – Near Free Space

               Break and Reassociate Distance vs Battery Voltage

             250

             200
  Distance




             150

             100

              50

               0
                   3     2.9     2.8         2.7         2.6   2.5   2.4
                                       Battery Voltage
Detailed Study of Mote Behavior
• RF Characteristics of Mica-Z Wireless
  Sensor Network Motes
  – Swee Jin Koh, MS Thesis/EE, Dec 2005
 Deployment Challenges - Sensor
• What kind of sensor modality should be
  used? – PIR, acoustic, magnetic,
  seismic…
• What is the range of the sensor?
• How reliable is the sensor?
• What is the resolution of the sensor?
• How much power does the sensor use?
• What is the cost of the sensor?
Detailed Study of Sensor Behavior
• PIR and Magnetometer Sensor Behavior
  – Mike Chesnut / C4I, Jun 2006 (expected)
Deployment Challenges - Network
• How scalable is the network?
• How fault tolerant is the network?
• How is the network affected by node
  failure?
• What is the network latency?
• What is the packet loss behavior?
 Detailed Study of Sensor Network
             Behavior
• Evaluation of the XMesh Routing Protocol
  in WSNs
  – Amos Teo, MS/EE, Dec 2005
     Deployment Challenges –
        The Whole Deal…
• How do we deploy the network?
• How do we manage the network?
• What are the data aggregation/fusion and
  analysis issues?
• What do you do when you detect an
  interesting event?
         WSN Configuration
• Configuration and Management of WSNs,
  – Min Young Kim/CS, Dec 2005
           Current Status
• Started late-2004
• Implemented and integrated in TNT SA
  System
• Field tested in TNT 2005
• Supported by MARCORSYSCOM and
  TNT/CDTEMS
               What’s Next?
• Continue testing in TNT/NPS Field Experiments
  (Netzer and Bordetsky IS/NPS)
• Tests in the Straits of Malaca, Thailand and/or
  Singapore (Ehlert, Steckler, IS/NPS)
• Integration with UAVs (Ravi V., SEA/NPS)
  – Steve Schall, MS / CS, Jun 2006 (expected)
• Integration with detection of anomalous behavior
  (Rowe CS/NPS and Faculty at UArizona)
• Irvine (WSN Security)
• Sankar (WSN & Medical stuff)
Thank You

Gurminder Singh
    CS/NPS
gsingh@nps.edu

				
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