I am just wondering, isn’t the optimal method of automatically navigating in real-time just a Kalman filter? The article says it takes an hour to pre-compute t

I am just wondering, isn’t the optimal method of automatically navigating in real-time just a Kalman filter? The article says it takes an hour to pre-compute the flight trajectory. That doesn’t seem to be very automated for something that only flies at 120 km/hr. A real-time FPGA implementation from 1997: https://www.sciencedirect.com/science/article/abs/pii/S0141933197000409 https://www.sciencedirect.com/science/article/abs/pii/S01419...