Abstract
This paper mainly discusses the in-orbit pointing calibration of the 4.2-meter antenna of the CE4 relay star by the Tianma 65-meter (TM65 m) radio telescope. Firstly, the pointing calibration scheme of the antenna in space is introduced. Then the feasibility of the method is demonstrated. The performance, advantages of the TM65 m antenna, scanning method and the aspects which should be careful are described. The stability of the receiver system is verified by satellite beacon and radio source signal. The solving methods are introduced in detail. Finally, the results of several measurements are given which show that the Tianma radio telescope can effectively calibrate the pointing of the space antenna. The error is no more than 0.05°. The successful practice of this method will provide an empirical reference for the in-orbit pointing calibration of space antennas in the future.
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