Patent ID: 6608590
Filing Date: 2003-08-19
Classification: H01Q

Abstract:
A method for aligning antenna polarization axes of a dual polarized end-user terminal having an antenna, the antenna being aligned with a satellite in relation to azimuth and elevation, the end-user terminal being configured to produce a first output corresponding to a first component of a received signal parallel to a first polarization axis of the antenna and a second output corresponding to a second component of the received signal parallel to a second polarization axis of the antenna, the first polarization axis being orthogonal to the second polarization axis, the method comprising the steps of:(a) receiving a linearly polarized signal having a frequency wherein for said frequency and during a time period when said signal is being transmitted, the satellite is not transmitting signals with a linear polarization that is orthogonal to said linearly polarized signal; (b) autocorrelating the first output and the second output to produce a measurement of autocorrelation; and (c) adjusting the antenna polarization, axes to minimize said measurement of autocorrelation.