Calc is a Fortran program that calculates theoretical VLBI delays and rates. It first computes a solid body rotation matrix which translates a set of site coordinates from the terrestrial reference frame (TRF) into the celestial reference frame (CRF). It then computes corrections to the transformed site coordinates for various effects such as the solid Earth tides, ocean loading, and pole tide, and further computes the a priori delay effects of the atmospheres and antenna axis offsets. It then computes the theoretical delays and rates using a model which includes relativistic effects. Calc also computes numerous partial derivatives of the delays and rates with respect to certain interesting effects, such as nutation, pole position, UT1, the atmosphere, site positions, and source positions, which can be used later in Solve analysis.
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机译：CALC是一个用于计算理论VLBI延迟和速率的FORTRAN程序。首先计算实体旋转矩阵，该矩阵矩阵将一组站点坐标从地面参考帧（TRF）转换为天体参考帧（CRF）。然后，它计算对变换的位点坐标的校正，用于各种效果，例如固体地球潮汐，海洋装载和极点潮，并且进一步计算大气和天线轴偏移的先验延迟效应。然后，它使用包括相对论效应的模型来计算理论延迟和速率。 CAP CANC还计算延迟和速率的许多部分衍生物，例如某些有趣的效果，例如询问，极位置，UT1，大气，位点位置和源位置，可以在求解分析中使用。
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