[Space] draft blog post

Michael O m at dgmo.org
Tue Feb 9 00:48:49 PST 2010


The orientation sensor is supposedly showing pitch,roll,yaw angles as
derived from the magnetometer.

The accelerometer is supposedly showing meters/second^2 acceleration per
X,Y,Z axis. So it should show 9.8m/s^2 on the ground.
I seriously mis-trust the accelerometer data. It's showing acceleration
values that are way too high or too low at different parts of the flight.

The GPS data is also mildly strange. It looks like the GPS is low-pass
filtering altitude, and it's unable to cope with the high ascent and decent
rates. That's my best guess for why it steps altitude by up to 500 meters on
occasion. The lat/long data looks fine; it's just the altitude.

I'm yet to go and take a close look at the acceleration directions (I just
did the magnitude) so it may be that the payload really was swinging that
wildly...

On Mon, Feb 8, 2010 at 9:42 PM, Christoph Maier <
cm.hardware.software.elsewhere at gmail.com> wrote:

> On Mon, 2010-02-08 at 21:27 -0800, Jonathan Moore wrote:
> > I am working on plotting more data from the G1... it is looking like
> > there is a data gap thou.
>
> There's not only a gap in the data, but there are also nasty steps in
> the altitude information, which I'm trying to isolate and analyze.
>
> The GPS kml with the invalid information ignored is at
> http://pony.noisebridge.net/~cmaier/EpicBalloonWin/Balloon001.corrected.kml<http://pony.noisebridge.net/%7Ecmaier/EpicBalloonWin/Balloon001.corrected.kml>
>
> What units are the AK8976A readouts in?
> Is there a data sheet for the part??
> And what does the "orientation sensor" measure, anyhow???
>
> > On Mon, Feb 8, 2010 at 9:22 PM, Mikolaj Habryn <dichro at rcpt.to> wrote:
> > >
> http://dichro.blogspot.com/2010/02/declaring-weeks-advance-notice-of.html
> > >
> > > Please send corrections, things to add, anecdotes (anec-data?), links
> > > to your own posts and image galleries, and anything else that should
> > > go into it.
> > >
> > > m.
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