Tolerance testing of multi-reflector antennas for geostationary orbit microwave radiometers

Abstract:

The geostationary orbit microwave radiometer antenna is composed of three large diameter reflectors. The orbit heat flow is complex. The reflector and its supporting structure will undergo large-scale deformation due to severe temperature changes. This leads to a decrease in the efficiency of the main beam and a deviation of the beam pointing. The single-freedom tolerance analysis of the antenna reflector is carried out. Based on the fully automatic multi-freedom tolerance analysis system, the relationship between antenna mechanical error and electrical performance is obtained. And the correctness of the tolerance value of each freedom is verified based on the Monte Carlo tolerance analysis method. Finally, the near-field test system is employed to test the main beam efficiency and beam pointing under the antenna tolerance state. Comparing and analyzing the measured tolerance value with the semi-physical simulation value and design value verifies the correctness of the tolerance analysis.