Patent ID: 8604975
Filing Date: 2013-12-10
Classification: H01Q,H04B

Abstract:
1. Apparatus for calibrating a multi-beam satellite system comprising a beam forming network providing a plurality of signal paths, the apparatus comprising a calibration processor for determining the phase and amplitude shift of a test path of the plurality of signal paths relative to a reference path of the plurality of signal paths from a first signal extracted from the test path and a second signal extracted from the reference path, the first and second extracted signals corresponding to a calibration tone, said calibration processor configured to either correlate the first signal with the second signal or correlate the first and second signals with a third signal corresponding to said calibration tone in order to compare the phase and amplitude shifts for the test path and the reference path, and the calibration processor further configured to determine the phase and amplitude shift of the test path relative to the reference path for at least two calibration tones of at least two different frequencies to allow a phase and amplitude offset of the test path for a signal of any frequency within an operational frequency range of the multi-beam satellite system to be calculated.