卫星过顶与成像区域时间的快速预报算法研究

在引入平均轨道概念的基础上,提出了一种针对低轨道卫星的过顶与成像区域时间的快速预报算法.以双行元初值求取的平均轨道参数为初始条件,通过目标与星下点在地球表面相对于地心的弧段是否小于可观测弧段进行预报的粗搜索,进而初步计算过顶与成像区域时间.通过分析不同纬度地面站过顶时间预报表明,在低纬度地区,快速预报算法预报精度可以达到秒级,随着纬度的增加预报精度逐渐变差.该方法为下一步基于SGP4的精确搜索预报奠定了基础,可大幅度降低星载计算机的计算量.

Fast algorithm for prediction of satellite passes and image opportunity

On the basis of mean orbit concept,a fast algorithm for the prediction of LEO satellite passes and image opportunity is presented. Regarding the mean orbit parameters from two line element(TLE) initial value as initial information,coarse searching is performed by comparing geocentric angle from target to subastral point with observable arc.The time of satellite passes is provided.The time prediction of satellite passes over earth stations at different latitude.It is indicated that prediction precision is up to second level at low latitude and gradually worsens with increasing latitude.The method establishes precondition for next exact search based on SGP4.and greatly reduces the onboard computational amount.