Research on Redundancy Solution of Satellite Transponders Based on Reliability Analysis

With the lifespan of most modern navigation and communication satellites greater than 10 years, it is very important to find an optimal redundancy solution for satellite transponders. In this paper, we propose redundancy solutions of satellite transponders with six signal paths. Firstly, we introduce the mathematical models of the reliability of typical schemes. Specifically, we propose a method to simplify the Boolean truth table and RBD (Reliability Block Diagrams) model by combining the full probability formula, to obtain the reliability analytical solution for the complex redundant system such as ring backup (hot/cold backup). We also provide the boundary conditions of different redundancy configuration tradeoffs based on reliability analytical solution. Monte Carlo simulation is used to verify the correctness of the analytical models and the analysis results. Finally, we verified the common redundancy solutions, and obtain the optimal solution based on analysis results. In satellite product design, the conclusion based on the method proposed in this paper can be considered in addition to the complexity and performance impact of the space borne product, which conform the basis to choose the redundancy solution for the designers.