A Study on the Influence of Signal Polarization on the Phase of Tracking Receiver
When the mobile satcom station moves in a large range,the tracking receiver's phase drift may occur,which is related to the signal's polarization mode used.Corresponding phase compensation measures must be taken to keep the stable tracking of the antenna.Based on a typical antenna feed network structure of the satcom earth station and the working principle of the circular po-larizer,the expressions of the output signals of each receiving port under different status are analyzed.According to the principle of single-channel monopulse tracking receiver and the physical significance of phase,the relationship between the phase and polariza-tion angle is studied when the sum and difference signals are used in different polarization mode.Phase compensation based on the study can effectively solve the problem of phase drift of tracking receiver caused by geographic position change,which is verified by several application cases.At last,the suggestion of signal polarization mode selection is given,the sum signal's polarization should be the same as the difference signal's when tracking a circular polarization satellite,and the polarization mode of the difference signal should be fixed when tracking a linear polarization satellite.
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