运载火箭导航计算子系统建模与仿真

Modeling and Simulation of Navigation Calculating Subsystem of Launch Vehicle

以国产CZ系列运载火箭为研究对象,在分析火箭导航计算子系统数学模型的基础上,建立导航计算系统的仿真模型并进行了全数字仿真。先将子系统分解成一系列功能相对独立的模块,如地球引力加速度计算模块、速度计算模块、位移计算模块等,采用MATLAB/Simulink对这些功能模块建立仿真单元模型,然后再进行仿真单元模型的集成,构建出运载火箭导航计算子系统的仿真模型。输入该型号运载火箭实际飞行中采样得到的加速度计输出信号进行仿真验证,得到的速度与位移变化仿真结果与实际情况基本相符,证明仿真模型建立正确、方法采用得当、有效。

Adapting the CZ series Launch Vehicle as research object, and focusing on the mathematical model of navigation calculating subsystem of Launch Vehicle, the simulation model of the subsystem was established in MATLAB/Simulink. The subsystem was divided into a series of independent functional units, such as earth gravity acceleration calculating unit, velocity calculating unit, displacement calculating unit etc. The sub simulation models of these units were built in Matlab/Simulink. The model of navigation calculating subsystem of Launch Vehicle was acquired by means of integration. Comparing with the real sampling data, the results show that the model is sound and the method is validity.