Even if it does not look as beautiful as I would like it to the data provided 99.3 % fix (with @wsurvey more conservative settings than the standard Emlid ones (e.g. no fix-and-hold)) for a mission with 2200 images. I have now added some extra lead apron around all receivers and electronics (I think I have added 50g of additional rf shielding. The copter flies about 30 min. with small props, so I decided to trade in better SNR values for flight time…). I will try tomorrow if I can improve the result.
For the on ground survey the results where fantastic (after I have adapted all settings within RTKconv and RTKpost/the cmd line tools), I’m quite happy with you’re recommendations @wsurvey!
I see a few issues with the near-horizontal lever-arm extending out, first one being vibration, which could cause the excessive amount of cycle-slips you have.
Second being you need quite a bit of cable to get out there. The shorter the cable the better.
If it was platform, I would rather move the antenna in on centerpieces on a vertical pole (like a carbon pole of a decent OD).
And probably even more likely, look into helical antennas instead. Much smaller footprint.
Results of the spiral antenna are good, as can be seen on the following plot. UAV was on the ground, among trees, until 00:35. From there you can see it clear right up. BeiDou Geo satellites (C01-C04) are now tracked properly and are useful for processing, whereas before they were a cycle-slip mess. There is still directionality evident in the SNR, but is not enough to matter.
Thank you @VanavaraDigital for your antenna recommendation. I have better tracking and saved about 15g weight. I appreciate your participation in the forum.
As for antenna shopping, I just go to ali express and search for ‘bt-560d’, and buy the cheapest one. That’s how I’ll get my next one. I will convert the second unit as soon as I can based on my test.
As for mounting, I bought some 25x25x1.5mm L-shape aluminium extrusion, cut a small piece, drilled a 6.5mm hole for the antenna, drilled 2x2mm holes for mounting to the timber mast, and strengthened the mount with 2-part epoxy.