The measurement of Nokov is good. Many domestic UAV research companies now use his motion capture system, and Nokov is a passive optical system. The internationally renowned Vicon and MotionAnalysis are also passive optical systems. Capture system, this technology is relatively more mature, more accurate in motion capture, and can be widely used in fields such as motion analysis, gait rehabilitation, virtual reality, film animation, game production, robots, drones, human-computer interaction, and military industry !