RTK GPS Explained. What are the benefits? (with HolyBro F9P hardware)
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- Опубліковано 12 лип 2024
- Huge thank you to Ben for sparing the time to explain and demo the RTK-GPS system using the HolyBro hardware. You can visit his shop here - www.3dxr.co.uk/
Links to the RTK-GPS things shown in the video: www.3dxr.co.uk/search/holybro...
See the HolyBro website for details too: holybro.com/collections/gps-r...
Time codes:
0:00 Introduction
0:41What is RTK GPS?
3:01 What hardware do you need?
5:33 How do you use it at the field (demo)
9:25 Considerations when using it
Thank you for taking the time to watch the video. You can find me on social media at / painless360
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What a fantastic overview of RTK GPS. I've always been curious and found it really complex. Thanks Lee and Uncle Ben.
Thanks Sarah! Have a great weekend!
Amazing hardware indeed, Lee! That could be really useful for so many occasions! 😮
Thanks a bunch for all the info!!!
Stay safe there with your family! 🖖😊
Great video Lee & fantastic topic! I’m very interested 😊
Brilliant! While reasonably expensive, this could now do away with the robomower wire tracking system which is such a pain to install! Great vid.
Only heard about RTK in an agricultural context a few days ago, well timed!
I had no idea that your “base station” could be mobile. I have always been interested in what had been going on behind the scenes of precise GPS, but this kind of information is crucial now that I’ve come up with a project requiring this knowledge. Many thanks to you both.
Great video. Moving base sounds intresting as you dont need to have a fixed ground GPS but not much infor out there yet. Maybe more will come to light when the Holybro UM982 comes out.
Thanks a lot for good clarification!
Good explaination..
Good Explanaition
great info!! interested in field mapping where no survey points exist...definitely PPK I'm told. Also the use of GCP's and CP's.
good job
GPS for yaw is something that I am greatly interested in would love to see a video about it :)
Is it possible to transmit corrections over ELRS, or is a separate dedicated telemetry system required?
No idea, I'd ask for this feature from the ExpressLRS dev team via Github. Looks like there is enough interest going from the thumbs up here... Best of luck
Look up elrs airport
Interested to know whether one base station could broadcast RTK corrections for multiple rovers in the same area? (Still want to get a 24hr endurance rover race going in a field one day 😅)
Great video, if its possible please also do a video on gps for yaw!!
I'll add it to the list. You can read up about it here
ardupilot.org/copter/docs/common-gps-for-yaw.html
Great! If you guys do more of this, an interesting question would be what RTK could do for vertical accuracy. After all a FW model in cruise moves fast horizontally, but not vertically, so maybe this could provide more precise altitude control for waypoint missions in hilly terrain?
With the cheap $50 RTK modules I use vertical accuracy is about double horizontal accuracy.
....so roughly speaking if you're getting 1cm lat/long accuracy you can expect around 2cm vertical.
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Not sure if F9P modules are better ....I can't afford those.
@@DEADB33Fwhat are you using ?
Hi, thanks for the information. Could you set it up to have a longer sampling (longer than a minute) to get a much more accurate absolute base station posittion?
can 1 helical servve more than 1 rover at hte same time ? do you need a clear sight between the rover and the helical or buildings can be there ? thanks
Plz make video on Pixhawk 6c mini , would love to see that
Already started. Make sure you are subscribed and have the bell notification icon selected. Stay tuned!
it is possible to make free corrections to the flight controller through an internet connection ?
Maybe, so long as there is a data connection back to the groundstation that should work. Happy flying!
Tried a quick google for some more info but found nothing.
Wonder if it is possible with Ardupilot/Mission planner.
@@vince086 lets say you have a pixhawk or apm 2.8 controller, you can connect it to a raspberry pi and with MAVLink/Mavproxy and 4G mobile modem, you can connect to the drone, so I'm curious if during this connection when you control the drone via misionplaner you can send RTK corrections for gps
If mission planner thinks it has a two way telemetry connection to the drone, then it should work. Let me know if it works!
Its worth the failsafe RTH accuracy for me alone .. cheers !
there's no CAN on a lot of flight controllers, what's another high precision gps will work with a matek?
Would this accuracy extend to the quads physical location ? Just in case one wants to drop off a package .
Yes. Sub cm accuracy versus sub 2m accuracy.. Happy flying
I would love to see a PPK demo for Ardupilot.
I'll add it to the list! Happy flying!
So is the base station constantly floating around in the 2-meter circle? Because that would mean the rover is also floating around in a 2-meter circle. Or, is the base station FIXED somewhere inside the 2-meter circle (when "use" is clicked)? But then if so, why not wait another minute (or much more) and get a really EXACT base station position? Thanks
No, once location is set and stored it is used. Happy flying
Is there a way to use 2 or 3 base stations? I would imaging using only 1 station only provides accuracy in radial direction, but using 2 could provide two radials and good accuracy in two orthogonal direction over substantial area. 3 base station to extend the applicable area.
One base is enough and can be used tens of km away. More videos on RTK coming soon.... Stay tuned
@@Painless360 oh. It doesn't use a signal from a station. It is not dgps. Station just transmit local corrections digitally. Got it.
Q: In a region where there is active GPS jamming occurring, can you manually set the base station coordinates, based on known position, and then the RTK is entirely independent of GPS signals. Is this correct?
Honestly not sure. There are discussions about manually entering coordinates but it is not something I know about. Happy flying
Instead of my own base station, my local airport has an NTRIP RTK base station and time corrections are freely available via internet. How do I get that time correction data to the F9P rover?
See my recent video on it... Happy flying
The video showed how the base station hardware is connected to a laptop and the software running on the laptop has some options and does some processing to latch on to the necessary incoming data to get the base station transmitting the correction data to the rover. What isn't clear to me is whether that entire process must be done each time. If I do that setup one day and come back on another day, placing the base station in the exact same location, do I also have to go through the process of connecting it to the laptop, running the software again, etc.? Or can I simply turn on the Base station hardware, having positioned it in the exact same location, and have it all work, have the rover receive the info and get the centimeter-level accuracy?
Alternatively, is there any (other kind of?) base station hardware that just sets itself up automatically, simply having been turned on, and NOT requiring a laptop (or smartphone, etc.) to do that setup processing? I'm envisioning a base station with basically just an on/off button, some status lights, maybe a buzzer, that just simply sets itself up and lets you know when it's ready and is transmitting the correction data for receipt by the rover.
Once a location has been set and saved, it can be used again the next time, reducing a number of the steps. Check out the RTK Ardupilot docs for full details. Happy flying!
@@Painless360 That sounds good. But you say "reducing the number of steps". So, does it still require connecting to a laptop each time, or can you just position the Base station in the exact same location and turn it on and it's all ready to transmit the data to be received by the rover?
I only know the process shown. Best of luck
can i use it with herelink connection ?
What is the max range between the base station and rover ?
For what part specifically?
I guess I’m asking how do the base and rover communicate, is there a telemetry module on both, or one built in ? How far away can you have the base station from the rover and still have it be cm level accuracy ?
First!
Ok so it is a "differential gps" same as we use at cat3 airports.