The PCM/FM ( Pulse Code Modulation/Frequency Modulation, Pulse Code Modulation / Frequency Modulation) system has the characteristics of strong noise resistance and flexibility, and has become a telemetry system long-term used in the international aerospace field, including China. With the rapid development of China's aerospace field in the past 20 years, telemetry receiving and launching equipment for missiles and other aviation vehicles has also become one of the important development directions of domestic research institutes and industry-related design companies .
Traditional PCM/FM telemetry system includes transmitter and receiver as well as physical channel part, in which the transmitter is mainly PCM coded and FM modulatedÿ