一种异轨等高MEO卫星的建链模式设计方法

Chain-built Mode Design Method of MEO Satellites in Different Circular Orbits With Equal Semi-major Axis

针对异轨卫星相对位置大范围动态变化的问题,在分析单颗卫星可见性、轨道特性及天线指向范围的基础上,提出了一种异轨等高中地球轨道(MEO)卫星的建链模式设计方法,推导了与建链模式匹配的最小离轴角解析式和指向范围判断式,并结合不同类型建链情况提出了两类建链模式实现流程及其匹配的最小离轴角解析式。对典型工况的稳定链路数、指向范围类型及最小离轴角进行计算,并与STK软件仿真结果比对,结果表明:文章设计的建链模式完全可行,最小离轴角计算值与仿真修正值偏差(小于0.1°)优于工程要求的指向精度(0.2°),具备工程应用价值。

Aiming at the wide range of relative position between satellites in different circular orbits,a chain-built mode design method is presented based on the analysis of satellite’s visibility,orbital characteristics and antenna pointing field between building inter-satellite links.The chain-built mode has an analytic formula about the least off-axis angle and discriminant of antenna pointing field.Meanwhile,two kinds of chain-built process with analytic formula about the least off-axis angle of antenna pointing are also presented.Then,the number of steady chains,type of antenna pointing and the least off-axis angle in typical cases are calculated.Comparing the calculated value with STK simulating results,it indicates that the chain-built mode is feasible,and the error of the least off-axis angle of antenna pointing is in 0.1 degree scale,which is better than the engineering requirement(0.2 degree).The chain-built mode has a good application value.