satellite orbital calculation may it be useful.-satellite orbital calculation may it be useful.

对ESA网站下载的GOCElevel_1b的EGG_NOM_1b数据进行提取，得到重力梯度观测值与四元数数据。(The GOCElevel_1b data of EGG_NOM_1b downloaded from the ESA web site are extracted, and gravity gradient observations and four yuan data are obtained.)