Research on Key Technologies of High-Reliability Telemetry Transmitters for Launch Vehicle Carrying

Abstract

To solve the problem of single-point series components in the internal circuit of the current PCM/FM launch vehicle carrying telemetry transmitter, this paper proposes a new circuit architecture that can eliminate most of the single-point working components of the transmitter without changing the external interface and usage mode, thus improving the reliability of the whole system. This scheme uses large-scale integrated circuits to reduce the number of chips in the transmitter. Two improvements are made in the overall structure of the transmitter. One is to use a zero intermediate frequency (IF) orthogonal up-conversion scheme to replace the traditional high IF superheterodyne scheme, which reduces the number of single-point series components in the circuit. Another is to utilize redundancy design, increasing backup and fault detection channels. According to the development of domestic devices, this paper uses two domestic B9361 radio frequency (RF) conversion chips to realize two ways up-conversion as main and backup channels and two ways down-conversions as fault detection channels. The experimental results show that the new telemetry transmitter based on this scheme can be compatible with the current transmitter and effectively improve the reliability of the whole system.