基于多重近似重访周期的火星-太阳同步回归轨道设计

在分析火星-太阳同步回归轨道数学模型的基础上，设计了回归周期的近似重访周期算法.基于对回归要素取整处理，结合回归轨道重访特征函数，通过对重访间隔子间距数的判断，可以得到最优近似重访周期和次优近似重访周期，近似重访周期的设计能以更高的时间分辨率实现对地覆盖.进一步分析了最优回归周期族与火星赤道表面覆盖率的关系，并计算了其对应的轨道参数.为火星探测初期的轨道设计提供了借鉴. 

Design of Mars Repeat Sun-Synchronous Orbit Based on the Multi-Approximate Revisit Period

Based on the analysis of the mathematical model of Martian repeat Sun-synchronous orbit, an approximately revisit cycle algorithm of return period was designed. Rounding processing the repeat factor,combining with the revisit characteristic function of the return track and judging the number of revisiting pitches spacer, the optimal approximate and suboptimal approximate revisit cycle were designed to achieve higher time resolution and cover the surface of the Mars. Further the relationship between the optimal regression cycle family and equatorial surface coverage of Mars was analyzed, and the orbit parameters corresponding to optimal regression cycle family was computed. It provides a reference for the track design for the initial exploration of Mars.