[Space] draft blog post

Greg grog at piratelabs.com
Tue Feb 9 07:35:33 PST 2010


You'll probably need to use an aircraft rated GPS or add an aircraft  
altimeter if you want reliable data.

Grog... On some random mobile device...


On Feb 9, 2010, at 0:48, Michael O <m at dgmo.org> wrote:

> 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
>
> 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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