Optimization method of finite thrust emergency orbit maneuver for an earth observation satellite
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摘要: 研究了对地观测卫星在有限推力作用下,快速轨道机动到目标区域上空的优化算法.分析了任务需求并选取两次点火的变轨方法,使算法更具普适性.推导出考虑J2摄动的三维空间的有限推力动力学方程.使用Lambert方法确定有限推力时间变量的取值范围,并在此基础上使用遗传算法进行优化,最终得到时间最优意义的优化结果.通过一个算例对整个优化算法做了验证.结果表明该算法精度高、计算时间短,适用于快速轨道机动任务.Abstract: The optimal emergency orbit maneuver method for an earth observation satellite was studied, which uses the finite thrust model. The mission requirement of the emergency orbit maneuver was investigated firstly. A twice orbital maneuver technique was adequately chosen to make the algorithm universal. The finite thrust dynamic equation in the three-dimensional space that considering the J2 perturbation was derived. The time variable-s span was given by solving the Lambert-s problem. The genetic algorithm was used as the optimization method to get a time optimal result. An emulation example was given to verify the method. The result shows the method has a high precise and can be get in a short time so it is available for the emergency orbit maneuver mission.
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Key words:
- emergency orbit maneuver /
- finite thrust /
- Lambert algorithm /
- genetic algorithms
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