I agree bitcraze its a great nano drone, but the first version has 3 minutes flight time and it can not be used outdoor, furthermore, Ardupilot is far more advanced and offers a lot more potential and with a huge community of experts, developers and user

UWB is really impressive and I see you have a optical flow positioning add-on board as well. Would like to play around with the current state-of-the-art, curious is fetting things to position indoors got easyer in the last 4 years, since last time I played with it.

Something I was thinking recently is using a lighthouse positioning system from Valve for indoor positioning. They have permissive licensing terms and the tech looks very promising:

https://partner.steamgames.com/vrlicensing

Yes! Lighthouse positioning system from Valve for indoor positioning it's so interesting, swarm compatible, easier to setup, cheaper and higher precision!

UWB is our present solution, its already easily in the 10cm accuracy in LOS scenario, it also enables complex indoor space with different connected rooms you want to cover, and you could cover easily 30m between each beacons.

We are discussing the option to integrate the optical flow directly into the ArduBee base. If you have suggestions, your contribution is highly appreciated.

There are also skyrocket drone, lastest serie is also running ArduPilot and most of the code is open both for autopilot and radio system