1. Target tracking apparatus including: input means, for receiving from an imager, a first set of data which comprises an image representing a viewed scene containing a target to be tracked, and for generating a second set of data which comprises a reference patch defining an area within said viewed scene containing the target; template generating means for receiving said second set of data and for generating a third set of data which comprises a binary template representing the target; and correlator means for receiving said first, second and third sets of data and for performing a multiplicative correlation process on said first, second and third sets of data and for generating a fix point representing the position of the target within said viewed scene.