摘要
考虑到Walker-δ星座中各星相互协作关系,提出一种基于覆盖性能的星座构型保持策略.作为策略判别指标的覆盖性能由一种改进的网格点仿真法获取.这种改进方法依照卫星星下点与网格点的几何关系,可以快速判断处于覆盖区的网格点,然后统计出星座的全球覆盖信息.卫星的标称位置是考虑J2项摄动长期影响得到的动态位置.星座运行过程中,一旦发现不满足覆盖要求的点,结合各卫星的标称位置,可以找出影响覆盖性能的卫星.最后将该卫星调整到标称位置即可完成构型保持.最后给出构型保持策略的仿真算例,仿真结果表明了策略的有效性.
Considering the coordinate relationship among satellites of Walker-δ constellation, a configura- tion maintenance strategy based on coverage performance is proposed in this paper. Coverage performance as a discriminant of strategy is obtained by an improved grid simulation method. According to the geometry relation between grid point sub-satellite point, this improved method can be used to find those grids within coverage zone and obtain global coverage information. Considering Jz perturbation the nominal position of satellite is dynamic. In operation of constellation, when dissatisfied grids are found, the satellite with reduced coverage performance can be found according to its nominal positiion. The configuration maintenance will be accomplished after the target satellite is adjusted to its nominal position. A numeric simulation is given. The result demonstrates the effectiveness of the proposed strategy.
出处
《空间控制技术与应用》
2012年第2期53-57,共5页
Aerospace Control and Application
关键词
Walker-δ星座
构型保持
覆盖性能
网格点仿真
Walker-δ constellation
configuration maintenance
coverage performance
grid simulation
