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GPS 5hz logger


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#1 robyr1

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Posted 20 December 2008 - 06:08 AM

I'm looking for a 5hz GPS logger on 3 axis, any suggest? I need to see the speed when the RC goes UP, DOWN, and LATERAL.
If there is no chance to log these files, is there another solution in real time (with OSD)??

#2 Faster

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Posted 10 January 2009 - 03:07 PM

Hi, robyr1.

I have test some time ago, with a friend with his airplane RC, the BitRaptor GPS Logger.
This logger works at 4Hz and car works for memmorise all 3axix. For now don't works in real time, but I think will be
develop in a short future.
Take a look at this link http://www.bitraptor.com

Have a nice day.
Italy

#3 robyr1

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Posted 11 January 2009 - 05:55 AM

thanks for your answer, but i think that system is too heavy.
I need a very smaller product because my equipment (camera+tx+battery) can't be over 17gr!

#4 Mr.RC-Cam

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Posted 24 January 2009 - 10:03 AM

18 gram GPS: http://www.rcgroups....ad.php?t=989273
- Thomas

#5 robyr1

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Posted 25 January 2009 - 07:11 AM

18 gram GPS: http://www.rcgroups....ad.php?t=989273


WOW!! thanks! but can i log the vertical speed also? but that unit is 1hz of update rate, not 5!

Edited by robyr1, 25 January 2009 - 07:14 AM.


#6 Kilrah

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Posted 25 January 2009 - 07:19 AM

Vertical speed = ((altitude at current point) - (altitude at previous point)) / (recording interval)...
As it logs altitude you can find VS.

#7 robyr1

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Posted 25 January 2009 - 07:33 AM

Vertical speed = ((altitude at current point) - (altitude at previous point)) / (recording interval)...
As it logs altitude you can find VS.


thanks a lot, but with a 1hz on a falcon wich flight at 300km/h with 8g of acceleration is not very accurate! VERY HARD to get right data! What's your suggest Kirlah?

#8 Kilrah

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Posted 25 January 2009 - 08:23 AM

What I suggest - get one, strap it on, hope for the best and see what you get. But consumer GPS, be it 1Hz or 5Hz will almost certainly NOT give you accurate readings in those conditions.
We know from testing on fast and agile planes like a funjet flying at 150km/h and able to make tight turns that the common GPS modules will get completely lost after a couple of sharp turns or steep vertical trajectories, reporting positions several hundred meters away from where they really are, even for several seconds after coming back to a normal path.

Edited by Kilrah, 25 January 2009 - 08:24 AM.