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Large range directive antennasfor wireless sensor network
J.P. CHANET, K.M. HOU, T. HUMBERT, P. RAMEAU, G. DE SOUSA, D. BOFFETY
Cemagref - LIMOS
Workshop on Wireless Sensor Networks Marrakech – June 2007
Workshop on Wireless Sensor Networks – Marrakech – June 2007
Outline
Introduction
Agri-environmental networks
Different types of antennas
Automatic control of directive antenna
Conclusion
Workshop on Wireless Sensor Networks – Marrakech – June 2007
Introduction: needs for agriculture
High regulation, economic and society constrains Food safety Quality label and certification Environment protection
Agriculture in network thanks to Internet Permanent exchange between the different industry players Growing request on product information and registration of
agricultural practices Need to collect data in large quantity
Automatic storage of data in real time and reliable Development of distributed databases between economic
players Improvement of equipment management
Development of embedded electronic devices (sensor, bus…)
Cost and sophistication growing
Need of automatic data acquisition
Workshop on Wireless Sensor Networks – Marrakech – June 2007
Introduction: needs for environment
Data collection for ing environmental indicators Multi scale indicators Areas not very accessible
Better management of natural resources Management of water resources Soil monitoring
Monitoring network for natural risk prevention Flood prevention Monitoring of dykes, barrages... Forest fire prevention Volcanos survey
Communication network in case of natural disaster Infrastructures destruction Needs for quickly operational solutions
Need of intelligent autonomous devices
Workshop on Wireless Sensor Networks – Marrakech – June 2007
Agri-environmental networks
Close relationship between agriculture and environment: Areas, actors, risks...
Need of flexible systems to be adapted to all applications
Two networks concept « Wireless Sensor Network » (WSN) « Mobile Ad Hoc NETwork » (MANET)
Workshop on Wireless Sensor Networks – Marrakech – June 2007
Networks with cluster
Workshop on Wireless Sensor Networks – Marrakech – June 2007
Node of agri-environmental network
+Asservissement()-Position
Antenne -Processeur-Flash-Sram-etc.
Matériel
+Thread()-Evenements
LIMOS
* 1
+FFCCC()+NIMBE()+Fct()
-MessagesCIVIC
1
1
LiveNode
1*
Workshop on Wireless Sensor Networks – Marrakech – June 2007
Different type of antennas
Omnidirectional antennas Radiate in all the direction
with the same energy
Directive antennas Radiate in one or two preferred direction
Omnidirectionnal
ParabolYagiPatch
Workshop on Wireless Sensor Networks – Marrakech – June 2007
Different ranges of antennas
Workshop on Wireless Sensor Networks – Marrakech – June 2007
Principle of automatic antennas
Workshop on Wireless Sensor Networks – Marrakech – June 2007
Flow chart
AP Antenna
Scan
SignalFound
FollowMobile
EndSession
YES
YES
NO
NO
Mobile Antenna
PointAP
NewSession
SendCoordinate
LinkOK
SendCoordinate
+ Data
EndSession
EndSession
End
YES
YES
YES
NO
NO
NO
Workshop on Wireless Sensor Networks – Marrakech – June 2007
Antennas realization
Audio Streaming without lost at 2 km (8km/s speed)
Workshop on Wireless Sensor Networks – Marrakech – June 2007
Example of an agri-environmental network
Workshop on Wireless Sensor Networks – Marrakech – June 2007
Conclusion
Development of long range directive antenna Use of low cost devices compatible with agri-
environmental context Different clusters of agri-environmental network
reachable Validation in a real farm
Development of new agri-environmental applications in European project NeTADDeD (FP6)
Integration of antennas for multi robots control
Workshop on Wireless Sensor Networks – Marrakech – June 2007
Thank for your attention