Communication mobile unit

1
Communication mobile unit

• Pavel Dvorák
• Wirelessinfo

2
Target application typical tasks

• Monitoring and tracing of vehicles
• Navigation
• Solution with high robustness and accesibility
  for emergency and security systems
• Mapping tasks
• Data transfer and processing on mobile equipment

3
Vehicle monitor and trace

• Real-time internet technology is a next-step of
  vehicle control systems compared to standalone
  device without internet access posibilities
• Bring high effecienci and flexibility
• Reduction of costs
• Security function thief protection

4
Emergency systems

• Simultaneously coordination of many vehicles in
  one time, sharing situation view
• More accurate navigation using robust algorithm
  and additional information ( DGPS )
• On-line connection to system operator
• Better coordination of all unit of system

5
Agriculture vehicles control

• Focused on transfer of information used in
  application of chemical agents ( fertilising )
• Managing of dosing
• Collecting and processing measured values,
  on-line transfer to GIS system( yeld maps ... )
• More accurate navigation using robust algorithm
  and additional information ( DGPS ) on the field

6
Requirements to mobile unit

• Wide communication posibility
• Computing power
• Easy connection of peripheral unit
• Low energy consumption
• High environmental resistance ( water,
  vibration, working temperature range )

7
HW architecture selection

• Processor AT91RM9200( 200MIPS, ARM9
  compatibility, current only 25mA )
• 64 MB RAM
• Max 64 MB Flash
• USB support
• MMC support
• Multiple serial line support

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Processor AT91RM9200

• Harvard architecture
• 200 MIPS ( by clock 180 MHz )
• 2x 16 KB cache
• On-chip debuging ( JTAG-ICE )
• USB support on the chip
• MMC support on the chip
• Ethernet support on the chip
• 4x RS232, RS485, IrDA, SPI

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Developped mainboard

• ARM processor
• 64 MB RAM
• 8 MB FLASH RAM
• MC card
• Power supply 6 to 14V
• Ethernet
• 4xRS232, 1x RS485

10
Developped mainboard

• ARM processor
• 64 MB RAM
• 8 MB FLASH RAM
• MC card
• Power supply 6 to 14V
• Ethernet
• 4xRS232, 1x RS485

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Internet connection GPRS modem

• Wavecom FASTRACK
• GPRS class 10, dual band
• GSM class 4 ( 2W )
• Open AT interface
• Power supply 6 to 32V
• Current peak 2100 mA
• RS232 interface

12
Power supply

• Controled by standalone processor ( Atmega16 )
• 4 independent power sources controled by ARM
  main unit
• LiPOL backup battery ( for cca 1 to 2 hours of
  activity )
• Integraded LiPOL charger
• Real-time monitoring of current and battery
• Real time clock with wake-up function
• Wake-up by external event

13
IO expander

• Based on Atmega16
• 4 inputs, 4 outputs
• 4 absolute counters
• RS485 interface
• On-chip debugging
• Power supply 6 to 18V
• Current 1 to 20 mA

14
Mechanical construction

• Based on electrical mounting box
• Resistance to high temperature
• IP54
• Information display ( 2x16 )

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Operation system - LINUX

• ARM OS based on Linux, kernel 2.6
• U-Boot system loader
• Internet connection over PPP line
• WiFi, BlueTooth ( connected to USB )
• Extended power management
• Wake-up possibility ( based on time or external
  event )
• Audio input-output support
• HTTP server
• GPRS-WiFi routing

16
Testing application

• Car tracing
• Connected to MAPLOG server
• Real time position
• Standalone meteo station
• Measurement of temperature and wind
• Communication with meteo station using RS485
• Processing of received values
• Computing of one minute values
• On-line transmiting to the server
• Displaying using MapSERVER and WFS