A Phase Calibration Free Method for Tri-band Ground TT&C Antenna

A free phase calibration method for satellite is proposed in this paper for tri-band ground tracking, telemetry and command (TT&C) antenna, in order to solve the problem of high phase calibration rate and low phase calibration success rate in high frequency band, especially Ka band. Firstly, based on the satellite phase calibration result database of ground TT&C antenna, the phase calibration results are matched one by one through downlink signal frequency point, rotation direction, equipment combination number and other elements. Secondly, taking the highest correlation environmental factor with the phase calibration results as the independent variable, and the phase shift value and gain of antenna azimuth/pitch axis as the dependent variable, the polynomial corresponding to the phase calibration results under specific environmental factors is fitted by the least square method. Finally, the phase calibration results in the satellite tracking cycle are calculated by the fitted polynomial. By using the proposed method in this paper, tedious phase calibration steps of ground TT&C antenna to satellite can be avoided, the equipment workflow and personnel operation can be simplified, and the success rate of phase calibration of ground TT & C antenna for Ka band satellites can be effectively improved by 10.7%.