比例导引的计算机仿真程序，包括主文件和其他函数，以及介绍文本-The proportional navigation computer simulation program, including the master file and other functions, as well as introduction text

最近在学习GPS解算算法时需要在GPS时（GPS周和周内秒）和公历日期之间进行转换，于是就整理了一些时间转换的小程序。 本文介绍了GPS时、公历、儒略日（JD）、简化儒略日（MJD）之间的转换函数。(Recently, when you are learning the GPS algorithm, you need to convert between GPS (GPS weeks and weeks) and the calendar date, so you sort out some s