A teaser from Michael Oborne, showing impressive precision. Using a Septentrio asterx-m and a HX-CH4601A. Full details coming soon to the APM wiki

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Comment by Darrell Burkey on November 25, 2015 at 5:25pm

I thought Michael had gone a bit quiet recently. Now we know why. Very impressive work!

Comment by Cala on November 25, 2015 at 5:55pm

Glup!! I'm still surprise with m8n, this looks more impressive;

It's not possible, if we have a gps and telem on the copter and on G station, that the GS work's as RTK station with any  good quality GPS or the tablet?

Comment by Cala on November 25, 2015 at 6:04pm

Or we need an special gps?

sorry the anxious to wait the wiki ;)

Comment by Jun O Noh on November 25, 2015 at 6:20pm

Oh good version 3.4. And one there is more good news.
The prototype for the current RTK navspark the team faces the issue of signal it pixhawk
Making. navspar the team gave a reply to photograph.

Comment by John Bond on November 25, 2015 at 7:10pm

The X-CH4601A is a dual frequency antenna so I assume the Septentrio Asterx-m is operating as a dual frequency receiver.  I'm sure it cost quite a bit more than the drone.

But, I guess the point is to tune ArduCopter 3.4 to take advantage of the precision of RTK so you might as well use a robust - compared to a L1 only - system for that.

More interesting will be how much success people have with much more affordable single frequency systems.

Comment by Patrick Duffy on November 25, 2015 at 8:06pm

Can't wait to implement this. Need precision positioning for making RF measurements with drones and have been waiting for an affordable solution. 

Anybody tried this solution? http://www.emlid.com/shop/reach-rtk-kit/


Comment by Michael Oborne on November 26, 2015 at 12:29am

the logs for that flight can be found here


the base station was set to send 1hz obs data, using rtcm3, with gps and glonass l1/l2, this is sent using the stock 3dr radio

the receiver was configured for 10hz data, using gps and glonass l1/l2, and the ekf was tunned to use the gps for altitude 100% and high dependence on gps position.

the accuracy of the gps in the video should be within the mm range.

Comment by Randy on November 26, 2015 at 2:08am

My understanding is that the GPSs in the video are at least 2k USD.  So quite expensive but then again, they apparently really work!

Comment by Tobias Witting on November 26, 2015 at 2:24am

impressive precision and also great accuracy! ;-)

Comment by Stijn Debecker on November 26, 2015 at 2:25am

We did an auto mission with the Septentrio asterx-m (https://www.youtube.com/watch?v=XrEAQV0pXUo). The landing accuracy is 10 - 20cm. The EKF makes also use from the altitude of the gps when switching from 3D fix to 3D fix RTK. It works on ArduCopter 3.3 and we make use from the sbf driver to read out the gps data. The base station sends rtcm3 messages at 1Hz and the receiver works at 10Hz.

A log from a flight in stabilize can be found here: https://perswww.kuleuven.be/~u0105330/RTK_stabilize.BIN


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