On motion and pointing error of the large radio telescope AB-axis mechanism

摘要

The common normal line length and the orthogonal error are presented to describe the errors of actual AB-axis mechanism in this paper, the motion equation of actual AB-axis with these two errors is established by the six sets continuous coordinate transformation. According to this equation, actual AB-axis mechanism will still point to the desired target point accurately. Through an example the main errors to cause pointing error are analyzed, so that the theoretical foundation for the development of high precision AB-axis mechanism is laid.