Multi-beam antenna calibration system of satellite by triple -toned calibration method
1.Shanghai Engineering Center for Microsatellites, Shanghai 200050, China; 2.Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
Abstract： To solve the asynchronous considering for low and high frequency of common calibration, the triple-toned calibration method was proposed based on the characteristics of multi-beam antenna system of satellites. The channels of multi-beam system was measured by three single tone calibration signals to ca-librate the full band amplitude-phase errors with quadratic fitting. The measurement errors were decreased effectively by fitting dots from repetitive measurements. The channel amplitude-phase response was compensated by the inverse function of the fitting characteristic curve. The single channel calibration was realized when the full band characteristic curve was turned to horizontal line. The interchannel errors were calibrated and compensated by amplitude-phase compensating term. The triple-toned method was applied in two calibration schemes of satellite antenna, near-field and far-field calibration. The results show that the proposed method can effectively solve the problem of channel mismatch.
2012, Vol. 33 
