Modeling of Manned Space TTC Communication Product Based on MBSE

Considering the various types of tracking, telemetry, and control (TT&C) communication services and the complex physical interfaces in manned space missions, this study developed an MBSE-based modeling architecture for TT&C product design and applied the model to an S-band communicator for a manned lunar landing project. Based on the development process of the S-band communicator, a three-layer model comprised of logic, physical, and device layers was constructed. Model parsing and expansion ensured data homology from the conceptual to detailed design stages. Within the three-layer model architecture, model encapsulation accommodates system-level verification for different application scenarios. First, the function, performance, and interface requirements of the S-band communicator were obtained by applying the logic layer model to analyze the manned lunar landing mission TT&C communication scenario and performing tradeoff calculations based on binding reference. Second, in the logic layer model, the functional requirements of the S-band communication were satisfied by the state machine model simulation, and the behavior and parameters were further decomposed in the module. In the physical layer model, Modelica and Matlab were used to model and simulate the physical performance parameters of the TT&C product. The device layer model was executed using the MBD method. By mapping and transforming the logical layer model, an interface control document sheet for the S-band communicator was developed, which describes the characteristics of the electrical interface pins.