Transmitter identification: The development of a high speed data acquisition system with receiving functions

Abstract

CRL (Communication Research Laboratory) has developed a system that improves the clarity of trigger settings used in the identification of FM radio transmitters. This method uses a hybrid system that consists of a trigger based high speed data acquisition system with receiving functions. This system enhances the ability to accurately identify FM radio transmitters via a narrow band spectrum trigger system (NSTS) that mediates the variable transient response patterns that occur when a press-to-talk button is switched on and off. To accomplish this, an NSTS unit was installed into a high-speed data acquisition system to elicit trigger settings that would provide discrete transmitter identification. This hybrid system was used to obtain rise and fall data from FM transmitters, and the transient response patterns were then analyzed. Experimental evaluation demonstrated that this method increases the dynamic range [receiver input level (Pin) = -70 to -110 dBm] and significantly reduces noise interference, making it possible to obtain more accurate transmitters identification.