Main Effect of Mutual Interference in Radio Communication Systems Using Broad-Band Transmitters

Present-day radio communication systems employing antijam techniques, such as frequency hopping or spread spectrum, require that the transmitter final stage be a broad-band solid-state device. An analysis of such radio communication systems has shown that these systems suffer from the effects of intermodulation (IM) products generated within the transmitters, especially under collocation situations. A qualitative analysis of the transmitter IM-product interference sources is followed by the development of a computational method for obtaining their disturbing effects on a VHF/FM radio system operating under severe tactical collocation scenarios. The computed results for other mutual interference sources upon the system are also presented. The numerical results of the developed computer printout are discussed and conclusions presented, which contribute to obtaining a clearer insight into the mutual-interference sources within the system, especially from the transmitter IM disturbances.