I’ve seen that Comnav released the K726 board a while ago: an RTK board with dual antenna and thus heading information! Heading tech specs (http://www.comnavtech.com/download/K726%20OEM%20BOARD-ENG.pdf) are excellent, like the other specs:

Azimuth: (0.2/R)° – where R (in meters) is the distance between the antennas
Roll or Pitch: (0.4/R)°

What do you think about it? Will it be a success like the K501G?

Greg,

Once the K501G has a fix, my experience is that it’s quite solid. Distance to reference station really matters.

I’d like to post some kind of controlled real-life comparison between the u-blox M8P and the Comnav K501G, but alas, consulting work has taken over lately.

For airborne work, I know that Henrik at http://www.trueflighttech.com/ has a lot of experience with the M8P and with L1/L2 systems. You might want to give him a call.

–Roby

Hi Roby and Randy,
I am also interested in interfacing K501G with Pixhawk for airborne (multicopter).
Do you ever see “bounces” in the GPS position ?
With the M8P, depending on the correction it receives, it can jump from several meters like a glitch .

Hi Roby,
Thanks!
Do you happen to know if the K501G has the capacity to output all the requested
parameters to complete the “Vertical Velocity” aspect of the Pixhawk GPS
Navigation as requested via Novatel/Tersus/ComNav GPS driver for ArduPilot?
Its probably not of much interest to you and the awesome mower project.
But it is pretty important to those of us with airborne equipment…
When your mower goes airborne, I’m sure you will be reaching for that “OFF” toggle switch
orientated in the correct direction and not so interested in those details…

Randy,

Yes I’ve used Pixhawk with the ComNav K501G for missions totaling several hundred hours. It’s a great system, and the driver interfacing the K501G to Pixhawk is provided in the stock Ardupilot software.

I haven’t yet got into PPK world, but RTKLibExplorer seems to post PPK musings fairly often — you’re likely already familiar with his blog.

–Roby

Hi Alexander,

Ardumower is a great project and your site has been a gold mine of information for years. Good to see your video of the Swift Multi — from the limited camera perspective, I would not call that environment “challenging” for a reputable L1/L2 GPS/GLONASS system.

Have you tested the u-blox M8P (with v3/v4 firmware update)? You might find that the M8P would demolish the Multi’s performance in nearly every facet except initial cold-start fix time.

RTKLibExplorer has recently compared the Multi to a lowly u-blox M8T running RTKLib. His results were in line with all independent reviews I’ve seen of both products.

Keep up the great work!

–Roby