非静止轨道卫星通信系统中星际链路性能研究

由于非静止轨道卫星之间的相对位置关系不固定 ,所以其星际链路变化比较复杂。为了能给出实现星际链路工程难易程序的量化指标 ,提出了星际链路性能 (方位角、仰角和星间距离的变化速率和范围 )的理论计算公式 ,详细分析了星际链路性能随系统星座参数变化的规律。然后结合具体的星座实例 ,给出了低轨、中轨卫星通信系统中的星际链路性能的仿真结果。提出星际链路的计算公式 ,对于卫星通信系统的星座设计、组网方案等 ,有着重要意义。

Study on the ISLs'' Characteristics of Non-Geostationary Satellite Communication System

Since the relative position of the non-geostationary satellited is unfixed, the change of their interplanetary links'(LSLs') characteristics is complicated. To give a performance index, this paper addresses the mathomatioal formula for ISLs' characteristios of the non-geostationary satellite communication systems, including the varying rate and range of azimuth, elevation and distance. Then it analyzes in detail the law that ISLs' charaoteriatics change with the parameters of the satellite constellation. Based on the example of the practical applications, the paper also presents the simulation results of the LSLs' characteristics of low earth-orbit (LEO) and middle earth-orbit (MEO) satellite communication systems. Formula involved are meaningful for constellation design, networking and so on.