A Method for Amplitude and Phase Calibration in a Spaceborne Multibeam Receiver

摘要

This paper presents a method for amplitude and phase calibration in a spaceborne multibeam receiver, which is based on the satellite-ground link, to solve the inconsistent problem in amplitude and phase between different channels. In this method, the calibrating signal is firstly immitted by a ground control station, and then the discrepancy of amplitude and phase between different channels and the reference channel in the receiver are determined by signal processing. And self-calibration would finally be achieved by some inversion operations. Additionally, this paper adopted an advanced discrete fourier transform method to determine the parameters which is help to overcome the spectral leakage caused by the doppler frequency shift. Results denote that errors of amplitude and phase would heavily influence the beam pointing and beam shape for a spaceborne multibeam receiver which will lead to a distinct decline in performance. However, this problem is meliorated after our adapting the method in this paper to calibrate the amplitude and phase errors of the receiver.