星载软件在环的GNC快速原型仿真系统设计

Design of GNC rapid prototyping simulation system of on-board software in the loop

为了实现复杂航天器导航、制导与控制(guidance navigation and control,GNC)系统的快速设计与仿真验证,加快GNC系统从算法设计到产品实现的过程,解决数字仿真与实物仿真一致性的问题,提出了一种基于星载软件在环的GNC快速原型仿真系统。通过虚拟GNC计算机处理器内核和硬件接口的方式实现星载GNC计算机原型,解决了快速原型仿真系统GNC软件代码与实物星载计算机软件代码的一致性;利用Simulink/Matlab进行航天器动力学/运动学建模和GNC系统测量部件及执行部件的数字化建模,基于实时扩展(real time extension,RTX)系统和功能硬件板卡实现数字化模型与实物的转化,解决数字仿真与实物仿真GNC系统内部接口特性、时序和逻辑一致性的问题。应用实例表明,基于星载软件在环的GNC快速原型仿真系统仿真数据与GNC半物理仿真系统仿真数据高度一致,证实了仿真系统设计的有效性;同时基于该仿真系统可以实现GNC系统软件、算法和单机产品的并行开发,缩短系统研制周期。

In order to realize the fast design and verification of the complex spacecraft guidance navigation and control （GNC） system, speed up the translation process of the GNC system from the algorithm design to the product realization, solve the problem of the digital simulation results inconsisted with the physical simulation. The on-board computer prototype is realized by using the virtual processor core and the hardware inter-face, which solves the problem of the GNC on-board software code development without the physical computer. Simulink/Matlab is used to simulate the dynamic and kinematic modeling of the spacecraft and the digital model of GNC measuring and executing components. Based on the real time extension （RTX） system and function hardware boards, the conversion from the digital model to the physical product is realized. The application examples show that the simulation data of the GNC simulation system based on the on-board system in the loop are highly consistent with the data of GNC physical simulation based on hardware in the loop, which confirms the validity of this simulation system design. At the same time, based on the simulation system, the GNC system software, the algorithm and the parallel development of products can be realized. The simulation system has the advantages of shorter cycle and lower cost by contrast with conventional GNC development.