A special mobile radio mobile, vehicle or personal location system is described where the system operates to locate any one of a the transmitters in an SMR system. The present invention operates by identifying the received signals, removing the modulation information to reconstruct a demodulated carrier...http://www.google.de/patents/US5592180?utm_source=gb-gplus-sharePatent US5592180 - Direction finding and mobile location system for trunked mobile radio systems
