Hello, I'm looking for some ideas as to how I can get the position of a beacon/actuator to within 0.1mm in a cube 10m x 10m x 10m. I need to take a reading off an instrument at every point within this volume, with a displacement of 0.1mm between readings. The lidar systems I've looked at are only good to within 1mm. Ultrasonic is right out. any ideas?