Simulation of PCM/FM Telemetry Data Encoder Based on IRIG-106 Standard in Matlab Simulink

The telemetry data encoder, a component of the PCM/FM transmitter system in the rocket telemetry (TM), adheres to the IRIG-106 standard. It’s used to gather data from sensors that monitor various rocket flight parameters, such as inertia, combustion pressure, temperature, etc. These encoders are typically developed and manufactured by defense-oriented industries, and due to their specialized applications, information about their development is rarely published. This paper elucidates the operational principles of the rocket TM system, with a specific focus on the TM data encoder module. The TM data encoder is designed and simulated using Matlab Simulink, and it’s capable of acquiring two types of input: analog sources and digital sources. The simulation uses a dataset of analog sensor acquisition results from previous tests to accurately represent the measured parameters, while actual hardware such as INS modules and cameras are used for digital sources. The performance of the simulation is evaluated by comparing the output signal of the TM data encoder simulation with the output of the Zodiac CMA, a device that complies with the IRIG-106 standard. The simulation results reveal that the output signal closely mirrors that of the actual TM data encoder Zodiac CMA. The sampling time for one TM data encoder parameter is designed to be 7.8125 µs, resulting in a bit rate of 1.024 Mbps. The latency that occurs during the process is 8.4355 µs.