火星探测器轨道运动建模的时空基准转换研究

火星探测的理论研究和工程实践需要一套便于描述火星探测器轨道运动的时空基准转换体系,环火星轨道的探测任务期间需要给出探测器以火星为基准的运动信息,而地面测控只能获得探测器以地球为基准的运动信息。为此,文章定义了一套新的以火星为基准的坐标系以及过渡到以地球为基准的坐标系,并给出了各坐标系转换的求解方法。最后,对以文中所提出的时空转换基准为基础建立的火星探测器轨道运动模型进行数值仿真,并将计算结果同STK进行了比较,验证了该时空转换体系的正确性。

Study of the Time-Space Bench Transformation of Mars Probe Orbital Motion Modeling

The theoretical research and engineering practice of Mars exploration need a systematic series of time—space transformation coordinate systems tO describe the orbital motion of Mars probes.During the Mars exploration missions,the relative motion information of the probe around the Mars should be presented.However,the Earth—based ground tracking and control can only provide the relative motion information of the probe around the Earth.In order to solve this problem,definitions of several Mars—centered coordinate systems were given,and computation methods of the transformation matrices between different coordinate systems were introduced.In the end,the numerical simulation of the Mars probe's orbit dynamics based on the time-space bench put forward in this paper was carried out.The results were compared with those obtained from based on STK.The comparison between the results demonstrates the validity of the time space transformation system.