Conflict when several apps use the accelerometers?

Helge Hafting helge.hafting at
Tue Jan 27 13:55:08 CET 2009

Gunnar Aastrand Grimnes wrote:
> This page does:
> Noise is around 3cm/s^2, i.e:
> "
> It can fill in _short_ - 3-5s gaps in GPS coverage, if the orientation
> of the phone is known.

Not enough for a 4km tunnel then, which is 3 min when going 80km/h.
5s is enough for a 111m tunnel, but 5s signal loss is usually not a 
problem anyway.

Of course, the car speedometer readout can take care of speed and 
braking/acceleration, the accelerometer would only be needed to notice 
turning. Could be interesting to see where it thinks I am after 3 min, 
if 5s is all I can expect. I guess those 3-5s is the interval where 
precision matces the gps. But it will be useful for longer than that, as 
long as estimate is more accurate than "stopped at the tunnel entrance."

The error increase with time, but so do the real distance from the entrance.

Helge Hafting

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