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为了获取分辨率更高的全月面图像数据,并对嫦娥三号任务预选着落区之一的虹湾地区进行高分辨率成像,“嫦娥二号”卫星提高了CCD立体相机的分辨率,并通过降轨机动进一步降低轨道高度,在远月点高度100km和近月点高度15km的椭圆轨道(简称试验轨道)的近月点附近对虹湾地区进行高分辨率成像。由于卫星能源的限制,卫星在该轨道上不能长时间停留。为了保证成像质量,要求太阳高度角必须高于15°。另外,必须有足够的测控弧段来满足测定轨道精度要求。这些约束条件都对该轨道的控制实施方案设计提出了很高的要求。文章结合嫦娥一号任务的工程实践经验,基于中国自身的测控资源和测控条件,对试验轨道进行了特性分析,根据成像约束条件和测定轨要求,给出了试验轨道的控制计算方案,提出了固定开机时刻和燃料最优两种计算方法解算控制参数。计算结果和误差分析结果表明卫星在试验轨道内满足安全和成像要求,确认了该方案的正确性和可行性。
In order to obtain higher resolution full moon image data and high resolution imaging of Rainbow Bay, one of the pre-selected areas for the Chang’e III task, the Chang’e II satellite increased the resolution of the CCD stereo camera , And further reduce orbital altitude through orbit maneuvering. High-resolution imaging of the Hongwan area near the lunar point near the elliptical orbit (orbit) at a distance of 100km at the lunar month and 15km at the lunar new moon point (the test track) Due to satellite energy constraints, satellites can not stay long in this orbit. In order to ensure the imaging quality, the sun’s altitude must be higher than 15 °. In addition, there must be sufficient control arc to meet the requirements of the orbit determination. All of these constraints place high demands on the design of the control implementation plan of the track. Based on the engineering practice of Chang’e-1 task, this paper analyzes the characteristics of the test track based on its own measurement and control resources and measurement and control conditions. According to the imaging constraints and the requirements of the test track, the control scheme of the test track is given. Fixed power-on time and fuel optimization of two calculation methods to calculate the control parameters. The calculation results and error analysis results show that the satellite meets the safety and imaging requirements in the test track, and confirms the correctness and feasibility of the scheme.