Warranty after fix for GTA02 GPS rework for SD card interferenceissue

Al Johnson openmoko at mazikeen.demon.co.uk
Fri Aug 1 12:03:38 CEST 2008

On Friday 01 August 2008, Vinc Duran wrote:
> On Thu, Jul 31, 2008 at 5:28 PM, Andreas Bogk <andreas at andreas.org> wrote:
> > <snip>
> > I'm not a mathematician, but I think I have sufficiently understood
> > Kalman filters and dead reckoning.  A little known trick is to use
> > ordinary integration with the strap-down equation given the
> > accelerometer and gyro input, and have the Kalman filter model the error
> > terms instead of the physical model state space.  This way, you only
> > have to update the Kalman filter every time you get a GPS fix, not every
> > time you get a measurement from the other sensors.
> >
> > But... what are our chances GTA03 will have a 3D gyro?
> >
> > Andreas
> Andreas,
> Could the accelerometers be substituted for a 3d gyro?

We only need to replace 1 of the 2 3D accels with a 3D gyro. I've not looked 
at the size or cost of solid state gyros so I don't know how practical that 
might be.

More information about the community mailing list