基于几何分析法的低轨星座设计

LEO Constellation Design Based on Geometric Analysis Method

针对导航增强的实时性、连续性及高精度定位等需求,提出一套基于几何分析法的低轨星座设计方案。首先确定单星对地覆盖场景的关键要素,结合具体情况并通过几何约束关系得出基本参数;然后提出一种混合星座设计方法,综合考虑地球非球形引力对卫星轨道的影响,以确定混合星座的参数配置;最后通过仿真实验论证方案的可行性。仿真结果表明,本文方案设计的星座能够提供满足用户需求的导航增强功能,在卫星的覆盖层数、几何分布及轨道稳定性等方面表现优异,为低轨导航增强领域的发展提供了数据支撑。

Aiming at the requirements of real-time,continuity and high-precision positioning of navigation augmentation,we propose a design scheme of LEO constellation based on geometric analysis.Firstly,we determine the key elements of the scene where a single satellite covers the earth,and,by combining the specific conditions and geometric constraints,we obtain the basic parameters.Then,we propose a hybrid constellation design method,which comprehensively considers the influence of the earth’s non-spherical gravity on the satellite orbit to determine the parameter configuration of the hybrid constellation.Finally,the feasibility of the scheme is demonstrated through simulation experiments.The simulation results show that the constellation designed in this scheme can provide the navigation augmentation function that meets the user’s needs,and performs well in the coverage layer,geometric distribution and orbital stability of satellites,providing data support for the scientific development of LEO navigation augmentation field.