基于 SOFA 的 GCRS 与 ITRS 间坐标转换

摘要

协议天球坐标系GCRS是一个准惯性坐标系，在研究卫星运动状态一般都是在这个坐标系下进行。国际地球参考系ITRS是我们常用的坐标系，一般性测量涉及的坐标都是这个坐标系。为了更方便地研究卫星问题，经常需要在这两个坐标系下进行转换。 IAU的标准基本天文程序库SOFA给出基本天文运算的库函数，利用这些库函数，可以方便地实现这两个坐标系的转换。基于SOFA的这些特点，利用C＋＋对GCRS与ITRS的坐标转换进行了研究。%The standard basic astronomical library SOFA of the library function IAU gives the basic astronomical calculations .Protocol celestial coordinate system GCRS is a quasi inertial coordinate system and the research in motion of satellite state is generally carried out in this coordinate system .International terrestrial reference frame ITRS is our common coordinate system , and coordinate GPS measurement involves value in this coordinate system .In order to study the satellite problem more convenient ,these two coordinate sys-tems often need to be converted.In this paper, based on the characteristics of SOFA, GCRS and ITRS, coordinate conversion is real-ized by C++.