Antenna pointing calibration based on cubic radiation pattern and cross scan

To get good antenna tracking pointing accuracy under imperfect measurement link status of complicated system, methods and measurements of cubic radiation patterns and cross scanning-and-tracking are proposed for the two 20 m Az-El antennas, which will be updated to take part in the observation and calibration of Mingantu spectral radioheliograph(MUSER), a powerful instrument dedicated for solar radio imaging observation. Least square method is also used to obtain the 8 parameters of the 20 m antenna pointing model. After calibration, the pointing accuracy is improved from about 12' (rms) to about 4.4' (rms), testifying the reliability of the proposed methods and providing a good reference for other complicated telescope systems.