<html><body bgcolor="#FFFFFF"><div>You'll probably need to use an aircraft rated GPS or add an aircraft altimeter if you want reliable data.<br><br>Grog... On some random mobile device...<div><br></div></div><div><br>On Feb 9, 2010, at 0:48, Michael O <<a href="mailto:m@dgmo.org">m@dgmo.org</a>> wrote:<br><br></div><div></div><blockquote type="cite"><div>The orientation sensor is supposedly showing pitch,roll,yaw angles as derived from the magnetometer.<br><br>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.<br>
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.<br><br>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.<br>
<br>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...<br><br><div class="gmail_quote">On Mon, Feb 8, 2010 at 9:42 PM, Christoph Maier <span dir="ltr"><<a href="mailto:cm.hardware.software.elsewhere@gmail.com"><a href="mailto:cm.hardware.software.elsewhere@gmail.com">cm.hardware.software.elsewhere@gmail.com</a></a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><div class="im">On Mon, 2010-02-08 at 21:27 -0800, Jonathan Moore wrote:<br>
> I am working on plotting more data from the G1... it is looking like<br>
> there is a data gap thou.<br>
<br>
</div>There's not only a gap in the data, but there are also nasty steps in<br>
the altitude information, which I'm trying to isolate and analyze.<br>
<br>
The GPS kml with the invalid information ignored is at<br>
<a href="http://pony.noisebridge.net/%7Ecmaier/EpicBalloonWin/Balloon001.corrected.kml" target="_blank"><a href="http://pony.noisebridge.net/~cmaier/EpicBalloonWin/Balloon001.corrected.kml">http://pony.noisebridge.net/~cmaier/EpicBalloonWin/Balloon001.corrected.kml</a></a><br>
<br>
What units are the AK8976A readouts in?<br>
Is there a data sheet for the part??<br>
And what does the "orientation sensor" measure, anyhow???<br>
<div><div></div><div class="h5"><br>
> On Mon, Feb 8, 2010 at 9:22 PM, Mikolaj Habryn <<a href="mailto:dichro@rcpt.to"><a href="mailto:dichro@rcpt.to">dichro@rcpt.to</a></a>> wrote:<br>
> > <a href="http://dichro.blogspot.com/2010/02/declaring-weeks-advance-notice-of.html" target="_blank"><a href="http://dichro.blogspot.com/2010/02/declaring-weeks-advance-notice-of.html">http://dichro.blogspot.com/2010/02/declaring-weeks-advance-notice-of.html</a></a><br>
> ><br>
> > Please send corrections, things to add, anecdotes (anec-data?), links<br>
> > to your own posts and image galleries, and anything else that should<br>
> > go into it.<br>
> ><br>
> > m.<br>
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