Dear Community,
Drotek, French tech start-up is proud to release its L1 RTK GNSS ! RTK technology allows to enhance GNSS positioning and to go down to centimeter level precision.
We have seen a lot of RTK boards coming up. However we have witnessed no good integration for the UAV segment and no performance enhancement in difficult environments.
This is why we decided to develop a solution to cope with these issues. Drotek is specialized in electronic design for UAVs and has put all its expertise in designing this board, jointly with French National Center for Space Studies (CNES) and French Institute for Aeronautics and Space (ISAE).
What is RTK for?
RTK technology uses corrections from a second GNSS receiver (called “base”, the other mobile receiver is called “rover”) in order to correct errors that lead to meter level precision. It has been used for a long time by surveyors, but at a very high cost. Today we want to trivialize this technology.
Our two years spent on developing this product have led us to focus on several points, such as connectivity, signal quality, EMI, real-time, etc...
We have compared our system’s performance with dual frequency receivers (in blue, Rover : Septentrio AsteRx 3 L1/L2 + Novatel geodesic antenna in RTK with base Trimble NetR9 + TRM59800), and it is pretty astonishing!
RTK works well in clean open-sky environments, but we like to test our device in difficult scenarios. Urban canyon is stil a pipe dream, but some route on ground robot in medium-hard environment (buildings, trees…) gives pretty good results :
Comparison between single GPS (red) and RTK : have a look at the left side under the tree. Single position gets highly contaminated by multipath, whereas the big ground plane and the Tallysman antennas filter it quite well :
Comparison between RTK Drotek (orange) and another open-source RTK solution (yellow) :
Base correction data can be sent through serial port with 3DR Radio types but also through cabled or wireless Internet for those want to get rid of range limitations. All drivers and server programs are already in the board. The following table sums up the different possible ways of communication between rover and base.
We are currently developing LoRa based transmitters, hoping that these will fulfill our expectations (we are quite excited about them!). Coming soon.
We truly believe in open-source community, but this board has also been designed to work “as is”. All boards will be delivered flashed and ready-to-use, with really little configuration, mainly for non-advanced users who would wish to get to precision without spending too much time on understanding how it works. Our wiki will explain everything step-by-step, but will also provide support on using RTKLIB graphical tools for post-processing and analyzing data. Do not forget to check our Github, we will publish in it really soon!
All our boards are stamped “Made in France”, we pay a lot of attention to the devices we manufacture in our French factory. Our motto is open source and open hardware, we work this way and we will stay this way. We want sell the atoms not the bits.
The package will be available in our site for pre-ordering. The expected release date is in one month, with a price of 699 € excluding VAT.
Our website is currently being redesigned, hope you will appreciate the new one! There will be plenty of content on how to use all the devices we manufacture, from little sensors to big boards!
Some additional exciting results :
This picture depicts the precision you can expect with good conditions, amazing!
A little demonstration (shot yesterday!) :
We modified an Iris+ drone, removed its GPS and replaced it by our board. Take-off is manual, and as soon as the drone lifted we triggered Return To Launch mode. The drone succeeded in landing on the table approximately 1 out of 2 times. It touched the table with at least two feet each time we tried the procedure. Wind conditions were quite gentle but with a fair amount of gusts. Even if the board provides precision, there has been a lot of work on the controller’s PIDs to achieve this result!
We used a Netgear WiFi router to transmit raw data from the base to the rover, using Edison's WiFi. Base was connected in Ethernet to the router, everything powered by a 4S LiPo and a 12V power module.
We will offer a board to the person who comes up with the coolest name for the device !
10% off on pre-order !
See you soon in our website !
Comments
I actually found my way with RTK to the kitchen and I'm having great pop corn right now. I certify it!
Darius strikes again !! Awesome. My popcorn is coming
@Hughes and that he wants the pixhawk grounded until it's 'syndromes' are fixed and it's certified by independent testing, much like this product..
I think he's a trollbot.
Gentlemen,
Thank you for this discussion. I'm on the verge of investing in an RTK system and welcome the addition of the Drotek offering to the pool. I have two Drotek M8Ns and offer only good reports of their performance.
Darius, once again you're spewing bile gibberish and not helping. You are wasting the time of actual experts and discouraging their participation. Please stop so that those of us who need their help can continue to benefit from their knowledge.
@Kevin, Guy, don't feed "the troll" (he already stated in other posts US sets standards in all other countries...An old neo-conservative wet dream of supreme domination ?)
@Darius, in France at least it is completely free, without any registration nor special terms, I have no knowledge if such institutes exist in other countries, but I guess there should be something similar
@ Pascal,
thank you for your time
did you read these papers first ?
Could you extract one sentence, one drawing in support of claimed RTK GPS higher GPS accuracy ?
@Kevin
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For instance in France the IGN (French National Geographical Institute) has stations all around the territory.
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Access to state owned and supervised ground control stations is restricted, subject to registration, fees and more complicated terms, so individual modellers, hobbyists are excluded this access.
Paul, due to ionospheric effects which cannot be eliminated with single frequency data, you need dual frequency system if your baseline is above, let say 20 km. Remember that precise GPS is always a minimum of two receivers, one being on a known point. We determine vectors. Several vectors for one point will give you the possibility to assess the accuracy.
As we are talking here about 5 cm accuracy, Google Earth does not offer this level of confidence.
Thank you @Guy,
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The RTKLIB in PPP‐static mode fixes the location with relatively high stability. Analysis of the accuracy of this fix results in the 2 m horizontal error when the vertical inaccuracy is at a level of 3 meters.:"
Did you read these papers ?
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