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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 mutual cooperation among all the stars in the Walker-δ constellation, a strategy based on the coverage performance is proposed to maintain the constellation configuration. The coverage performance as an index of strategy discrimination is obtained by an improved mesh point simulation method. The geometric relationship between the point under the satellite and the grid point can quickly determine the grid point in the coverage area and then calculate the global coverage information of the constellation.The nominal position of the satellite is the dynamic position obtained by considering the long term influence of J2 term perturbation. Constellation operation, once found does not meet the coverage requirements of the point, combined with the nominal position of the satellite, you can find the satellite that affects coverage performance.At last, the satellite is adjusted to the nominal position to complete the configuration retention. The simulation example of configuration retention strategy shows the effectiveness of the strategy.