On 5/3/2018 9:26 AM, Mark Sims wrote:
Those results were with the "ultra rapid" orbits. It will be interesting to
see what they look like when the final precise orbits are available in a couple of weeks.
I also need to see how those values compare to Lady Heather's precision survey
results.
I think to really be confident about a position you really need the
dual-frequency data (or that data from a nearby reference station),
otherwise you could end up in a situation where you're consistent, but
that consistency has a bias. IIRC, anyhow -- I'm not sure how the math
actually works
It's worth noting that you can get rid of a /lot/ of the variance on a
modern linux box:
1) Set the CPU to run at the same speed at all times (generally "max
performance" but which way you do it doesn't really matter)
2) Set processor masks so that no processes other than your timing code
I got a message from the Swiftnav support folks yesterday (I have a
piksi multi amongst my little fleet of GPSen) because they had an
emergency firmware patch to their kit because of a change in the L2C
signal was giving them issues. (Props to them for getting a firmware
update out in ~12
Can anybody comment on the toaster oven approach?
Is it practical for things like this? How much does a solder mask cost? How
much other stuff do I need? Does the solder paste need to be refrigerated
and other quirks like that?
What are the chances of a newbie getting a 44-QFN right on the
There are many small volume assmebly houses available. But the problem
is that you will have setup costs in the order of at least 100-300€,
even if you go to China. So, producing lots of less than 10 is not economical,
probably should aim for 100.
I recently ran across MacroFab
A couple months back, Gregory posted a heads-up that there were some
pretty cheap Novatel dual-frequency GPSses on eBay (thanks, btw!). I
managed to get one of these ('make an offer' for $450) and ... it's
actually pretty nice. Not only a decent GPS, and dual-frequency, but the
included
So Tom and I were batting this one around for a while, and think
we mostly know what the proximal cause of the reported problems are,
even if we don't know the specific code bug that causes the Skytraq
failure. I have a database of recent (last year) broadcast parameters
that made it
I really recommend the PC Engines apu2c hardware. Just a touch over $100,
schematics available, hardware serial port, GPIO, 1588-capable PHY, CPU
crystal accessible if you want to try a clockblock-type hack, great
support, and just decent all around.
There's also test pads for the PHY that could
