太阳同步回归轨道卫星的重访特性研究

Research on Revisit Properties for Sun-Synchronous RGT Orbits' Satellite

针对太阳同步回归轨道的重访问题,提出了探究重访特性的系统方法。该方法以Q值建立太阳同步与回归轨道间的联系;采用基本交点距的描述方法,将回归周期内轨道的访问顺序加以量化;应用数论中的贝祖定理,将重访周期的确定转换为求解一丢番图代数方程。仿真算例选以光学载荷对地观测为前提,得到了特定回归周期轨道的访问顺序及地面覆盖情况,确定了相应的重访特性;此外,以轨道高度范围为约束,以快速重访为目标,确定了太阳同步回归轨道的设计方法。结果表明,该方法可以确定具有良好重访特性的最优解。

The system approach is put forward to explore the revisit properties for the sun-synchronous RGT orbit. This approach bases on the Q value to combine sun-synchronous orbit and RGT orbit, and quantifies the problem of visit order during one repeat cycle with the use of base interval. Besides, by employing the Bezout＇ s theorem of number theory, the problem of determining the revisit cycle is transformed into solving a diophantine equation. The earth observation through optical payloads is chosen as the precondition for simulation examples, and then the visit order for some specific repeat cycle and the coverage condition of satellite are acquired. Finally, corresponding revisit properties are achieved. Besides, the design method of sun-synchronous RGT orbit is given to realize fast revisit with the constraint of orbital altitude range. Numerical simulations have shown that this method can determine the optimal orbit equipped with good revisit properties.