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Tom Kent replied to Russell B. Sutton's discussion 'Weather station with uav's'
I don't think he was implying that we correct the baro alt with GPS, but add corrections to baro alt based on a different barometric sensor at a know altitude (on the ground).
Tom Kent replied to eng.a.ramdan's discussion 'GPU CUDA programming'
Wow. I was shocked to see that, but after a bit of further investigation, it seems that the company is officially supporting it:
http://www.imgtec.com/powervr/powervr-graphics.asp
That said, I'm still somewhat skeptical (or possibly…
Tom Kent replied to eng.a.ramdan's discussion 'GPU CUDA programming'
I'm pretty sure that the panda board (looks similar to the beagle board) doesn't work with CUDA, which I believe is nvidia only. Its possible that it will work with OpenCL, but I'd be a bit surprised there too.
When you…
Tom Kent replied to ip9's discussion 'Does anyone have any experience with CHDK'
Yeah, I've had good luck setting up repeated timed shots with my SD1000. Once you read through the instructions on getting it setup, its really easy. I think there are even scripts on the site already set for this, you just need to…
Tom Kent replied to eng.a.ramdan's discussion 'Stereo Camera Specs'
Awhile back I ran some calculations on what kind of theoretical performance you could get from wing-tip spaced stereo cameras.
You can see the attached matlab (I actually ran it in octave) script that does the calculations, but the…
Tom Kent replied to Jan Martin's discussion 'UAV hardware for leveling of streetviews?'
Yeah, if you've got the infrastructure to wire it in, that is definitely the way to go. In theory (who knows about in practice) the latency between the command to take the picture and the actual capture should be approximately…
Tom Kent replied to Jan Martin's discussion 'UAV hardware for leveling of streetviews?'
The trick with just strapping a logger of any type onto the system is synchronization. How are you going to determine what point in the logger's history corresponds to when an image was taken.
Ideally you'd have some cable from…
Tom Kent replied to DaveyWaveyBunsenBurner's discussion 'Video encryption?'
Yeah, I wasn't even mentioning the size, and the need for compression. 640x480 video with 24-bit color is ~1MB/frame. 30 frames/second = 30MB/second > 200Mbit/second....even the fastest wireless links will break down at…
Comment Wall (1 comment)
- At 7:32pm on October 5, 2009,
Darryl Uchitil said… - Some amateur radio folks put together a DGPS reference station a while back. Used Motorola Oncore GPS, which the UT+ model supported "site survey" mode. A survey took about 3 hours but then you had your own reference.
You can find the HW docs here: http://www.tapr.org/gps_vpib.html
and the DGPS C code here: http://www.tapr.org/software_library.php?dir=/gps/DGPS/N8PXW Control software here:http://www.tapr.org/gps_tac32.html
You can still find these GPS units on ebay, but since they are 10 years old, current models are likely more accurate, as receiver noise plays a significant role.
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