"Clever.
Now go for the t-shirts and coffee mugs..
-=Doug"
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Steve Zeets
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Steve Zeets's Discussions
The UnDrone
Started this discussion. Last reply by R. D. Starwalt Mar 14. 1 Reply 0 Likes
With all of the bad press…Continue
Tags: UnDrone
High Accuracy RTK Positions with the LEA-6 using RTCM via NTRIP
Started this discussion. Last reply by John Bond Aug 6, 2012. 18 Replies 1 Like
I was just thinking...Has anyone looking into real-time correcting the LEA-6 (or other DIY Drones GPS) using RTCM via Internet Protocol (NTRIP). I'm assuming you would just need to have a cellular…Continue
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Steve Zeets posted a discussionThe UnDrone
With all of the bad press "Drones" have been getting lately I was thinking someone should come up with a catchy name for all of the "other drones". The good drones that, hopefully, someday will be assisting scientists and engineers to do their jobs or help farmers assess their fields... The good drones that might be first on the…See More
John Bond replied to Steve Zeets's discussion High Accuracy RTK Positions with the LEA-6 using RTCM via NTRIP"The "middle ground" in accuracy for GPS (decimeter-level) can be gotten to via either code or carrier or a combination of both. Differential corrections are required though.
Higher-end boards have better code range measurements and…"
Steve Zeets replied to Steve Zeets's discussion High Accuracy RTK Positions with the LEA-6 using RTCM via NTRIP"John,
Thanks again for the excellent information!
Couple more questions.
1. Could you explain the "middle ground"? I don't mind if your answer is more complex, I think it will be great information to process.
Thanks for the…"
John Bond replied to Steve Zeets's discussion High Accuracy RTK Positions with the LEA-6 using RTCM via NTRIP"1) Look at the accuracy specs. If the specs are cm-level carrier phase data is being used, if meter-level it's code only. There's a middle ground, but I'm trying to keep it fairly simple. If the GPS can do…"
Steve Zeets replied to Steve Zeets's discussion High Accuracy RTK Positions with the LEA-6 using RTCM via NTRIP"John,
Thanks for the great explanations!
I have a couple questions.
1. How can you tell if a GPS can handle CODE or CARRIER? (i.e. Can you show me where the LEA6 says in the specs that it can't process CARRIER? I believe you…"
John Bond replied to Steve Zeets's discussion High Accuracy RTK Positions with the LEA-6 using RTCM via NTRIP"A few notes on cm-level GPS.There are basically two levels of accuracy acheiveable with GPS. Meter-level and centimeter-level. Meter-level accuracy relies on C/A code data and centimeter-level relies on carrier phase data. Any…"
Barrett Ames replied to Steve Zeets's discussion High Accuracy RTK Positions with the LEA-6 using RTCM via NTRIP"I've been known to develop some GPS software :) Spent a couple years with it in college
"
Steve Zeets replied to Steve Zeets's discussion High Accuracy RTK Positions with the LEA-6 using RTCM via NTRIP"I agree, the ability to post-process would be a great start. Real-time corrections, either though the internet or via radio link to another receiver, would be the best.
Now if we can get someone who knows how to write the code and make it all…"
Kevin Schumacher replied to Steve Zeets's discussion High Accuracy RTK Positions with the LEA-6 using RTCM via NTRIP"I would love to get real time <10cm accuracy.
Another option would be using some post processing. Is there a way to log the raw GPS observations in the APM2 with LEA-6, and post process (RTKLIB) with base station data. Then update the…"
Jake Stew replied to Steve Zeets's discussion High Accuracy RTK Positions with the LEA-6 using RTCM via NTRIP"I'm not aware that anyone is working on a GPS correction scheme. The "follow me" feature is coordinating two GPS locations though, I think.
"
Steve Zeets replied to Steve Zeets's discussion High Accuracy RTK Positions with the LEA-6 using RTCM via NTRIP"Yes, GPS accuracy is important.
I'm not sure about what all can be used to pick up the signals. I do know that they typical broadcast in the 450-470 MHz range. All you need is the exact frequency they are broadcasting and they you…"
Jake Stew replied to Steve Zeets's discussion High Accuracy RTK Positions with the LEA-6 using RTCM via NTRIP"Sounds like a great idea! The more accurate you can get your GPS the more things you can use it for.
I wonder if you could use a cheap SDR to pickup radio correction signals? I've been looking at getting one to pick up ADSB…"
Steve Zeets replied to Steve Zeets's discussion High Accuracy RTK Positions with the LEA-6 using RTCM via NTRIP"Jake,
The WAAS network is setup specifically for the FAA and they want to make sure it is 99.999% reliable so when you're landing an airplane, you don't lose your corrections. They are only guaranteed accurate to 7.6 m accuracy…"
Jake Stew replied to Steve Zeets's discussion High Accuracy RTK Positions with the LEA-6 using RTCM via NTRIP"Thanks for the explanation. I wonder why these stations aren't incorporated into the WAAS network? Maybe there just isn't enough bandwidth on the sat signals to do more than a few dozen points.
Sounds like you have some good…"
Steve Zeets replied to Steve Zeets's discussion High Accuracy RTK Positions with the LEA-6 using RTCM via NTRIP"The WAAS ground-based network is composed of about 20 or so reference stations in the CONUS. The networks I'm talking about are composed of a grid of reference stations spaced every 50 km, or so, around each state (that has one). …"
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