航天测控任务可靠性的混合分析方法

二元决策图（binary decision diagram， BDD）方法和直接仿真法在评估测控资源规模大、阶段任务多的测控任务的可靠性时都存在局限性。从分析单个阶段任务的可靠性损失量出发，提出一种测控任务可靠性分析的解析模型，并基于强制法快速获取解析模型所需的输入数据。通过案例，验证了混合式分析法相对BDD方法和直接仿真法在时效性上的优势。这种结合解析模型与快速仿真法的混合式分析方法为解决测控资源规模大、阶段任务数量多的测控任务可靠性的评估问题提供了可行的手段。

Mixed method for analyzing the reliability of TT&C mission

Both binary decision diagram (BDD) method and crude simulation method have limitation to evaluate the reliability of tracking, telemetering and command (TT&C) mission that has lots of TT&C resources and phases. Based on analyzing the mission reliability decrease in each single phase mission, an analytical model is proposed for solving the reliability of the TT&C mission. A fast simulation method for estimating the reliability of highly reliable mission systems, called forcing, is used to obtain the input data of the analytical model. Compared with BDD method and crude simulation method, the advantage on time efficiency of this mixed method is proved through an example. The mixed method combining analytical model and fast simulation method offers a feasible technique to evaluate the reliability of the TT&C mission which has huge number of TT&C resources and phases.