I was asked this in a phone interview for a robotics job. Googling has not really helped. I assume it is some sort of state prediction model that can be used in a Kalman filter.
Can anyone give me a formal description? A link to a reference would also be nice.
EDIT to clarify, the interview was for a self-driving car company and before the question we had been discussing Kalman filters, Particle filters, and path planning algorithms (A*).