em: Moving embedded networked sensor applications from concept to deployment

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em Moving embedded networked sensor
applicationsfrom concept to deployment

• Jeremy Elson, Lew Girod
• Center for Embedded Networked Systems

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Fundamental Problems

• We are trying to build systems that meet global
  performance criteria
• Design evaluation must use a global view

BUT...

• The systems are inherently distributed and have a
  strictly local view.
• In a deployed system, we cant iterate on design.
  There is no way to know if using the discarded
  information would have changed the outcome.

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Fundamental Problems

• Reuse of proven algorithms (and code) is very
  important, even for normal software
• Given the difficulty of instrumenting our fielded
  systems, reuse becomes critical

BUT...

• Domain and application knowledge is needed at
  many layers.

How do we create reusable components? How do we
verify components that we change?
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Hardware
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In the real system, each node is autonomous they
communicate via the real environment
. . .
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In the simulator, the real software runs in
a synthetic environment (radio, sensors,
acoustics)

. . .
Very Simple Radio Channel Model
Very Simple Acoustic Channel Model
EMULATOR/SIMULATOR
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In the hybrid, the real software runs
centrally, interfaced to hardware distributed in
the real world.

. . .
EMULATOR/SIMULATOR
Radio
Radio