Dynamic Sensor Networks DARPA Review User Platform

1
Dynamic Sensor NetworksDARPA ReviewUser Platform

• May 30, 2001USC Information Sciences
  InstituteArlington, VA

2
Compaq iPAQ H3600

• 206 MHz StrongARM processor
• 16 MB persistent flash
• 32/64 MB RAM
• Serial/USB ports
• Expansion BUS
• 1, 2-slot PCMCIA sleeves
• VGA out, microdrive, networking, etc.
• CF sleeve
• Custom sleeves
• 320x240 display with 4096 colors
• Rechargeable batteries (Li-ion)

X
3
Linux on iPAQ

• Compaq supports Linux through http//www.handhelds
  .org
• All iPAQ hardware now supported under Linux
• ISI-East contributed support for suspend/resume
• iPKG (Itsy Package Management System)
• Embedded Linux packaging and distribution system
• Developed at ISI-East
• Now an integrated part of standard handhelds.org
  Linux Distributions.

4
BackPAQ Research Sleeve

• Digital Camera
• 32 MB Flash RAM
• 2 PCMCIA Sleeves
• Accelerometer
• Programmable Logic, (FPGA)
• Digital IO Port

http//crl.research.compaq.com/projects/mercury/
5
Sensor Network Interface

• IPAQ running Linux with 802.11 wireless Ethernet
  PC card.
• Cross-displayed VT GUI from Linux laptop to X on
  IPAQ.
• Displayed node locations, live vehicle ground
  truth, live seismic energy levels, etc.
• Live wireless video from laptop webcam to IPAQ
  using VIC tool.
• Achieved 5 fps (now 30 fps).
• Exploring better integration of video into VT
  GUI for multi-camera display.
• Investigating low power video transmission codecs
  under PAC/C PADS project.

6
State of VT GUI on iPAQ

• Cross-displayed VT GUI from Linux laptop to X on
  IPAQ.
• Still waiting on a Java port for native execution
• Free Java implementations are immature (kaffe has
  Java 1.1.8)
• Port of Suns JDK 1.3 are help up in conformance
  validation, (status unchanged since February)
• Currently investigating heads-up display with
  PCMCIA VGA card

7
Wireless Surveillance and Video Conferencing

• Live video display demonstrated at 29 Palms using
  multicast MBONE video tools over wireless
  network.
• Were very interested in integrating some video
  capability into fielded sensor node for future
  experiments.

8
GPS Ground Truth

• IPAQ GPS 802.11 Ethernet
• Logged vehicle locations once per second.
• Transmitted log to mySQL database in real time
  when in range of wireless LAN.
• Ran 8 hours on 4 D-cells.
• Worked great!

9
Long Haul Ethernet

• Provided long-haul link from base camp to sensor
  field.
• (2) access points with directional antennas (3
  mile range).
• Provided an instrumentation backbone without
  wires.
• (2) access points with omni antennas (0.3 mile
  range).
• Worked very well in the field.
• 11 Mb/sec adequate for most purposes (including
  video).
• Convenient to be able to telnet to all devices
  even in vehicles!
• Recommend full coverage at next exercise.

10
Instrumentation Laptop

• One instrumentation laptop per 3-node HYDRA
  cluster.
• Log radio events, seismic energy from HYDRA
  serial port.
• One UPS battery per cluster.
• Weighs 65 pounds!
• In practice, barely adequate.
• In future, plan to use more IPAQs instead!

• Linux Laptop powered by UPS.
• 802.11 Wireless Ethernet
• USBlt-gtSerial(8) Hub
• Wireless access point hub(in gateway laptop
  only)