求翻译：本文研究了基于面电流的反射面天线电性能计算方法。首先介绍了国内外目前反射面天线的研究和发展现状，接着简要介绍旋转反射面天线的几何学特性以及反射面天线的基本电磁理论。然后对口径场法和面电流发的基本理论进行了说明，引入一种新的坐标变换方法，将结构网格转换成电磁网格，并编写了相应的天线电性能计算程序，绘制天线的方向图并进行了相关天线电性能参数的计算。文章还对相同其他条件下口径场法和面电流法计算所得结果进行了比较，分析了二者在同频下的计算精度差异，以及误差主要来源。是什么意思？

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