中文摘要：

探月返回飞船再入过程是整个探月任务的关键环节。为了给再入任务提供设计参考和验证手段,设计了一套全数字的再入飞行仿真系统。首先,建立了飞船再入6自由度动力学模型,设计了导航制导控制系统,构建了推力器模型;然后,设计了集成所有运行模块的仿真系统框架;最后,设计了满足功能需求的再入飞行仿真的运行流程。基于蒙特卡罗打靶技术,该仿真系统能够对再入轨迹特性进行分析,并能够验证测试导航制导控制系统和气动构型设计。对某探月返回飞船再入的蒙特卡罗打靶仿真验证了仿真系统的功能和有效性。

英文摘要：

The re-entry process of the lunar-return vehicle is the key to the whole lunar exploration mission. To provide design reference and a validation method for the re-entry mission, a suit of digital simulation system for re-entry flight is developed. Firstly, the six-degree-of-freedom dynamic model is constructed, and the system of the guidance, navigation and control （GNC） is proposed. The modeling of thrusters is also consi-dered. Secondly, the framework of the simulation system including all working modules is developed. Finally, the working procedure of re-entry flight simulation which satisfies functional requirements is designed. Based on the Monte Carlo method, the simulation system can analyse the features of re-entry trajectories, and assess the GNC system and the design of the aerodynamic configuration. The validity and the function of the simulation system is validated through the Monte-Carlo re entry trajectory simulation of some lunar-return vehicle.