Diapositive 1

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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
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Outline

• Introduction
• Agri-environmental networks
• Different types of antennas
• Automatic control of directive antenna
• Conclusion

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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
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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
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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)

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Networks with cluster
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Node of agri-environmental network
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Different type of antennas

• Omnidirectional antennas
• Radiate in all the directionwith the same energy
  
• Directive antennas
• Radiate in one or two preferred direction

Omnidirectionnal
Patch
Yagi
Parabol
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Different ranges of antennas
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Principle of automatic antennas
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Flow chart
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Antennas realization

• Audio Streaming without lost at 2 km (8km/s speed)

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Example of an agri-environmental network
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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

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• Thank for your attention