[Space] draft blog post

[Greg]

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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