Apparatus having corresponding methods and computer-readable media comprise: an input module adapted to receive a plurality of pseudoranges each determined by a receiver based on one of a plurality of wireless single-frequency network (SFN) signals transmitted at a predetermined frequency from a corresponding plurality of transmitters; and a transmitter identification module adapted to identify one of the transmitters for each of the pseudoranges based on the pseudoranges and a plurality of ranges each predetermined between one of the transmitters and one of a plurality of predetermined geographic locations.