I am looking for a indoor positioning/2d motion tracking system for small robot cars (1:8 scale RC cars). We want to use the system as a ground truth for the development of autonomous driving applications, so looking for an accuracy of a few millimeters. The testing area is around 10x10m. The cars are running ROS (Robotic Operating System), so an existing implementation would be nice.
A known solution is a OptiTrack motion capture system, but with a cost of >10kEuro this is way above our budget of around 1.5kEuro. I have also been looking in using HTC Vive trackers with OpenVR, but I am not sure if this is a reliable solution.
Any idea would be very welcome!