I am Aleskou, i leave in France, 38, I am an agronomist, i want to sell accurate maps and help integrating those technologies for the end user.
I am really not an electronician or ingeneer, so i might make big mistakes, please be indulgent.
Just to share my work, i am advancing on PPK, i just found a way and time to cleanly fix the alpha on my drone (phantom 4).
It doesnt involve any modification on phantom 4.
I bought & mount for fixing a 360 camera on the feet of phantom 4, fixated a pole for the gps and tangled the antenna cable and alpha.
Power comes from micro usb of phantom 4
Here is a picture, i made it hover in my garden, but the weather is not very good for real try.
The GPS fix on phantom 4 didnt seem to be worse with the antenna.
The plan is to log alpha as rover on phantom 4 and log alpha as base on a fix point.
Then retag the pictures.
Process would be
1 Put base and rover in place
2 Start tag on base and rover
3 Take picture of GPS time displayed so i might be able to find the good timing for synchronizing the solution and exif time date from picture
4 Fly with drone deploy
5 Process in RTKLIB both logs
6 retag with geosetter
Full weight is 1.610 kg
PS : I should add collars around the p4 arms to hold the mast of antenna