[Noisebridge-discuss] spacebridge balloon launch appears to have succeeded

Mitch Altman maltman23 at hotmail.com
Tue Feb 9 20:40:52 UTC 2010


Wow.  Pretty amazing.  Too bad the video cut off -- it would have also been cool to see it descend.  :)  But this was quite cool!

 

Mitch.

 

 

--------------------

> From: dichro at rcpt.to
> Date: Tue, 9 Feb 2010 12:24:25 -0800
> Subject: Re: [Noisebridge-discuss] spacebridge balloon launch appears to have succeeded
> To: maltman23 at hotmail.com
> CC: rachel at xtreme.com; noisebridge-discuss at lists.noisebridge.net
> 
> On Tue, Feb 9, 2010 at 11:48 AM, Mitch Altman <maltman23 at hotmail.com> wrote:
> > Great photos!  And way interesting to watch the video pop out through the
> > clouds.  :)  Is there a way to know how high up it went?  How did you get
> > the cameras back?
> 
> We had two GPSes onboard. The one that was known to work above 60k
> feet was connected to the APRS tracker and radio, but didn't log any
> data locally. That was the single position report that we got at
> around 61k feet.
> 
> The other GPS was internal to the Android phone, and, as we suspected,
> it cut out at around 60k feet due to the common anti-cruise-missile
> provisions. However, our Android code was also furiously logging all
> the other sensors on the phone, including the accelerometer.
> Processing this turns out to be a bear - it appears that either the
> hardware or the interface software runs a smoothing filter over the
> data before it's presented to the application, and we were running way
> outside the envelope that it was expecting, so the data shows huge
> discontinuities (eg, 1500 feet of vertical ascent in a second) between
> smooth gradients which are probably largely fictional.
> 
> When the GPS cut out we were rising at at least 1200 feet per minute
> (which is a good match for anecdotally reported terminal ascent
> velocity for other people's launches), and the accelerometer data
> (although also rubbish due to unknown noise sources) shows a definite
> dip about 311 seconds later, so we're calling that the burst point.
> a+b*c gives us about 67k feet with confidence, possibly above 70k
> depending on how you process the noisy source data.
> 
> Next time I'll give you a more confident answer :)
> 
> m.
> 
> >
> > Mitch.
> >
> >
> > --------------------
> >> From: dichro at rcpt.to
> >> Date: Tue, 9 Feb 2010 10:00:34 -0800
> >> To: rachel at xtreme.com
> >> CC: noisebridge-discuss at lists.noisebridge.net
> >> Subject: Re: [Noisebridge-discuss] spacebridge balloon launch appears to
> >> have succeeded
> >>
> >> On Mon, Feb 8, 2010 at 11:15 AM, Rachel McConnell <rachel at xtreme.com>
> >> wrote:
> >> > I see where you got this camera thing sorted out:
> >> > http://www.flickr.com/photos/genriel/sets/72157623376093724/
> >>
> >> Those are from the camera that our new best friends from
> >> http://spaceballoonproject.blogspot.com/ provided, actually. The
> >> camera I was asking about we just pointed down and started recording
> >> video at launch - http://www.youtube.com/watch?v=go56JzqoFK0 - which
> >> turned out so well (until it ran into a max filesize problem, grumble)
> >> that I think we're just going to glue flip video cameras all over the
> >> outside of the next one.
> >>
> >> (there's a longer version out there somewhere with a few minutes of
> >> black screen with puzzled and slightly comic debate about how to
> >> attach payload to a giant balloon - we weren't quite perfectly
> >> prepared ;)
> >>
> >> > AWESOME PICS.  Anything up somewhere to read about this yet?
> >>
> >> http://dichro.blogspot.com/2010/02/declaring-weeks-advance-notice-of.html
> >> is the first, I think. More will surely come.
> >>
> >> m.
> >>
> >> >
> >> > Rachel
> >> >
> >> > Mikolaj Habryn wrote:
> >> >> On Fri, Feb 5, 2010 at 10:55 AM, Martin Bogomolni
> >> >> <martinbogo at gmail.com> wrote:
> >> >>> Can't you roll back the firmware of the SD400 using the links provided
> >> >>> on chdk.wikia.com?
> >> >>
> >> >> Not entirely sure - but will look into it tomorrow. Although the
> >> >> firmware images are there, I didn't see a way of getting them onto the
> >> >> camera.
> >> >>
> >> >> m.
> >> >>
> >> >>> On Fri, Feb 5, 2010 at 12:17 AM, Mikolaj Habryn <dichro at rcpt.to>
> >> >>> wrote:
> >> >>>> I bought a Canon camera off ebay to use on the spacebridge balloon
> >> >>>> launch this Sunday, but it turns out to have a firmware version on it
> >> >>>> that's too recent to work with CHDK (and therefore support time lapse
> >> >>>> shooting). Does anyone have a superfluous Canon (compatible with CHDK
> >> >>>> - list on the right-hand side of http://chdk.wikia.com/) that they'd
> >> >>>> be willing to swap for this SD400?
> >> >>>>
> >> >>>> (I'd ask for a loan, but there's a reasonable chance of never getting
> >> >>>> it back :)
> >> >>>>
> >> >>>> m.
> >> >>>> _______________________________________________
> >> >>>> Noisebridge-discuss mailing list
> >> >>>> Noisebridge-discuss at lists.noisebridge.net
> >> >>>> https://www.noisebridge.net/mailman/listinfo/noisebridge-discuss
> >> >>>>
> >> >> _______________________________________________
> >> >> Noisebridge-discuss mailing list
> >> >> Noisebridge-discuss at lists.noisebridge.net
> >> >> https://www.noisebridge.net/mailman/listinfo/noisebridge-discuss
> >> >
> >> _______________________________________________
> >> Noisebridge-discuss mailing list
> >> Noisebridge-discuss at lists.noisebridge.net
> >> https://www.noisebridge.net/mailman/listinfo/noisebridge-discuss
> >

 		 	   		  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.noisebridge.net/pipermail/noisebridge-discuss/attachments/20100209/da65bdf8/attachment-0003.html>


More information about the Noisebridge-discuss mailing list