Best Drone Localization Techniques for GPS-Denied Environment


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Hello!

I am working on a project where I need a quadcopter to accurately know its location relative to a starting point in a GPS denied environment in the dark.

A quick overview of the project:
The drone will be mounted on a vehicle in a docking station
When prompted, the drone must hover above the vehicle by ~20 m
The drone must be able to accurately locate its position relative to the docking station in the dark without GPS
The drone must also be able to react to movement of the vehicle (very small movements in nature)
When finished, the drone will return to the docking station

Given the requirements of the problem I have been looking at a couple solutions:
1. Use around 3 infrared beacons on different parts of the vehicle with a camera on the drone to perform localization (looking at the IR-LOCK sensor and beacons for this purpose)
2. Use ultra-wideband communication with a similar setup of three or so anchors and one receiver on the drone (looking at the Pozyx anchors and tag)
3. Use LiDAR or some kind of laser to do the job (haven't looked into this one as much)

Any suggestions or tips you may have would be greatly appreciated. Thank you!

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