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Noland's Discussions

FPV and Control over 1 radio link

Started this discussion. Last reply by jflagarde Apr 3, 2011. 3 Replies

I'm starting to design a tricopter and I want FPV video and control to use one RF link (probably 900MHz). I'll use a dsPic on both ends to run the codecs. I need a radio though that can do at least…Continue

Tags: FPV, transmitter, radio, video

Realtime DGPS with ublox and GPSTk lib processing, relative <1m?

Started this discussion. Last reply by Mirko Antonini Oct 7, 2015. 85 Replies

I've read through a few discussions on this forum about poor man's DGPS and getting relative accuracy down to the ~1m range.  It seems no one's having much luck even with identical GPS units.  I'm…Continue

Tags: relative, acurracy, post-processing, ublox, GPSTk

 

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Latest Activity

Mirko Antonini replied to Noland's discussion Realtime DGPS with ublox and GPSTk lib processing, relative <1m?
"Hi Noland. Yes, we use a tuned ceramic patch inside the shinguard and we wireless send real time corrections. Code corrections are very stable also in dynamic. Accuracy decreases with the distance from the reference (better <10km, best <1km)."
Oct 7, 2015
Noland replied to Noland's discussion Realtime DGPS with ublox and GPSTk lib processing, relative <1m?
"That's awesome accuracy. Where is your antenna? in the shinguard? ceramic patch?"
Oct 6, 2015
Mirko Antonini replied to Noland's discussion Realtime DGPS with ublox and GPSTk lib processing, relative <1m?
"Hi, I can suggest you to try DGPS using differential code correction. You can use your own base or grab NTRIP stream from a local GNSS reference. Then, you wireless send RTCM 2.3 correction to any new generation u-blox/NVS receiver. We did it. We…"
Oct 2, 2015
pixof replied to Noland's discussion Realtime DGPS with ublox and GPSTk lib processing, relative <1m?
"Hi all,Here is a file explain what I have down and the problem I have meet.Canyou give me some advice? Thank you very much! http://community.emlid.com/t/some-problem-about-rtknavi-and-strsvr/742/1"
Aug 4, 2015
Trenton Astley Isla replied to Noland's discussion Realtime DGPS with ublox and GPSTk lib processing, relative <1m?
"Here is the Link for my raw observation, UBX format.still, i cannot get a solid FIX solution. :("
Oct 29, 2013
Trenton Astley Isla replied to Noland's discussion Realtime DGPS with ublox and GPSTk lib processing, relative <1m?
"yes John has a good point. In my location i can get 8-11 satellites in view in average. will that be sufficient? And Simon, about the ground plane is there a formula that i can use to be able to calculate for the ground plane size, or the bigger…"
Oct 28, 2013
Simon Wood replied to Noland's discussion Realtime DGPS with ublox and GPSTk lib processing, relative <1m?
"John has some good suggestions there... Doing post-processing rather than realtime give the advantage that the data can be computed in the reverse direction, and thus may be able to extend a fix 'back' for sections of 'poor'…"
Oct 28, 2013
John Bond replied to Noland's discussion Realtime DGPS with ublox and GPSTk lib processing, relative <1m?
"If you just want to try one thing I'd change the Integer Ambiguity Res parameter (RTKNavi options - Setting2) to Continuous instead of Fix and Hold.  This will be more forgiving of a bad fix. What I'd really do is take a step back…"
Oct 28, 2013
Trenton Astley Isla replied to Noland's discussion Realtime DGPS with ublox and GPSTk lib processing, relative <1m?
"are there still people following this thread?i am setting up my RTK system using 2 ublox receivers and 2 ublox active patch antenna and RTKLIB,,, sometimes i get FIX solution for short period of time but mostly FLOAT SOLUTION. Also, when i get a new…"
Oct 27, 2013
Crashpilot1000 replied to Noland's discussion Realtime DGPS with ublox and GPSTk lib processing, relative <1m?
"Hi! I am also very interested in this subject but i am lacking the mathematic and programming abilities to pull something off like you did. I think it might be possible to reduce the error if you swap some steps. My postulate: acc/x/y/z are read…"
Jan 13, 2013
Chakradhar replied to Noland's discussion Realtime DGPS with ublox and GPSTk lib processing, relative <1m?
"Hi Anthony, Iam looking for a solution for my Octocoptor for arial photography and film precise position and lock....I have a flight controller ARM processor also I can add additional processor like Gumstix....ready to buy a good antenna like…"
Jan 10, 2013
Simon Wood replied to Noland's discussion Realtime DGPS with ublox and GPSTk lib processing, relative <1m?
"> What I don't get is if 2 units are identical and close to each other...would getting DGPS corrections help? DGPS is a low grade correction, slightly better than WAAS as it's localised. RTK is dependant on one of the receivers knowing…"
Sep 13, 2012
Noland replied to Noland's discussion Realtime DGPS with ublox and GPSTk lib processing, relative <1m?
"Ah. No, I didn't attempt that. This thing had to operate without web connection so even if that would have worked, I didn't look into it. Although I guess it would have been insightful to pinpoint the problem. What I don't get is if…"
Sep 13, 2012

Developer
Craig Elder replied to Noland's discussion Realtime DGPS with ublox and GPSTk lib processing, relative <1m?
"http://en.wikipedia.org/wiki/Networked_Transport_of_RTCM_via_Internet_Protocol NTRIP is a way of getting RTCM messages via the internet http://lefebure.com/software/ntripclient/ have a desktop and a phone app Out of the box, you could feed…"
Sep 13, 2012
Noland replied to Noland's discussion Realtime DGPS with ublox and GPSTk lib processing, relative <1m?
"Ok, it's been a while since I had my head swirling in GPS. Remind me how NTRIP works? That's a TCP stream with correction data from various ground locations? And that acts as one end of a baseline?"
Sep 13, 2012

Developer
Craig Elder replied to Noland's discussion Realtime DGPS with ublox and GPSTk lib processing, relative <1m?
"It's probably not the antennas that are the issue.  Are you some place where you could establish a baseline using NTRIP?"
Sep 12, 2012

Profile Information

About Me:
Ex-engineering physicist turned nurse
Please tell us a bit about your UAV interest
Trying to a build a poor-man's dgps
Hometown:
Valemount

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