Dear Sir/Madam

  we are developing a new telemetry system for racing cars. We are using
your accelerometers
to trace on the PC a racing line from three (XYZ) accelerometers placed onto
the racing cas.

  We are having major problems in deriving the circuit coordinates from the
signal, especially because
when the car goes around an hairpin (to consider the worst case) the
accelerometer is pointinng
in the opposite direction but still providing forward acceleration signal
(i.e. saying it is going
forward while it is going backwards compared to few seconds earlier). In
other words the
accelerometer ROTATES (together with the car) on its z axis instead of
remaining "fixed" with
respect to some reference coordinate system, and the accelerometer has no
way of detecting the z-axis rotation.

  We don't want to use a gyroscope (if possible).

  Could you confirm that this is the case and we are not making major
mistakes?

  If we are making major mistakes, could you please point us in the right
direction?

  How do we process the 3 signals (or 2 signals for XY mapping) to account
for this?

  Do you have any algorithm you could supply us so we can see how it is
done?

  We are on extremely tight timescale and would very much appreciate if you
could povide us
with as many details as possible to avoid further delays in the project.

  Many thanks

  R. Anzil
  [R&D Director]

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