【作者】 韩毅；

【导师】 荆武兴；

【作者基本信息】 哈尔滨工业大学 ， 飞行器设计， 2007， 硕士

【摘要】 本文针对子卫星弹射后的轨道控制问题进行研究,首先假设一颗子卫星被母卫星通过弹簧弹射,然后在控制作用下进行轨道过渡,并最终形成伴飞状态的过程。其中主要研究针对子卫星的轨道过渡段,由于子卫星控制力不完备,所以需要设计一种控制律,使其能够令子卫星追踪母卫星,最终形成伴飞状态,并满足工程要求。对此本文给出了子卫星相对母卫星的运动方程,并将飞行过程设计为:自由飞行段和控制飞行段。利用最优二次型控制方法,设计出了子卫星轨道过渡的控制律。在卫星的轨道动力学方程中,控制量为连续力,但一般实际工程中都是通过常值推力,所以利用PWPF方法,将连续力离散为常值推力。并在此基础上分为两种情况进行了仿真分析,给出了仿真结果:首先是控制力完备的情况,在这种情况下通过所设计的控制律,子卫星可以快速到达到伴飞状态,并且能够满足工程要求;其次是在子卫星轨道平面内,沿体坐标轴,有三个方向可以施加控制力,而一个方向没有控制力的控制力不完备情况,这种情况下,子卫星依旧可以通过设计的控制律到达伴飞状态,并满足工程要求,只是时间要相对增加不少。最后,分析了摄动对两星伴飞状态的影响,可以发现近地轨道上主要的摄动力将会对两颗卫星的伴飞状态造成影响,如不施加控制力进行调整,两卫星的伴飞状态将遭到破坏。更多还原

【Abstract】 This paper presents the research on Sub-satellite orbital control problem after ejections. First of all, I assume Sub-satellite ejected from Main satellite by spring, and then progressive orbit transition under the control system, and engender formation flying finally. The main problem is the section of Sub-satellite orbit transition. Because the control force of Sub-satellite is incomplete, it require to design a control law, which could make Sub-satellite trace Main satellite, engender formation flying and satisfy requirements of engineering projects finally. This paper presents the relative motion equation between Sub-satellite and Main satellite, and split flying process into two parts: Free flight phase and Control flight phase, and then use quadratic type optimal control methods to design the control law of Sub-satellite orbit transition. In the orbit dynamics equations, control force is continued, but in engineering projects use we constant thrust control, so we need use PWPF method. And meanwhile, it conducts a comparison of the two conditions. The first condition is that the control force is complete. In such cases, Sub-satellite may achieve formation flying speedily by the control law, and could satisfy requirements of engineering projects. Secondly, in the Sub-satellite orbit plane, there are three directions control force in body-coordinate axis. In such cases, Sub-satellite may achieve formation flying by the control law also, and could satisfy requirements of engineering projects, but the time is increased. At the end of this article, it gives perturbation analysis for formation flying, and discover that major perturbative force in low earth orbit could make influence for the formation flying.更多还原