In order to make use of the exiting program about orbit calculation of satellites which is written in Fortran, Mixed-languages programming (Fortran and VC++) is realized by using DLL.

• 为了利用现有的、用Fortran 编写的卫星轨道计算子程序,本文采用动态链接库的方式实现了Fortran 和VC++的混合编程。