Automatic polarization control system for TVRO receivers
AssigneeCapetronic (BSR) Ltd.
InventorsJohn Y. Ma, David H. McCracken, Steven Weiss, Albert C. Houston, III
Life of this patent
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Abstract
In a TVRO earth station having an antenna for receiving incoming satellite signals and polarizing means associated with the antenna for adjusting the relative alignment of the antenna orientation and the polarization of the incoming signals, an automatic polarization control system comprising means for producing an electrical control signal for controlling the polarizing means to adjust the relative alignment, means for detecting the noise level in the satellite signals received by the antenna, and means responsive to the detected noise level for adjusting the control signal, and thereby adjusting the polarizing means, to minimize the detected noise level.
Claims14
In a TVRO earth station having an antenna for receiving incoming satellite signals and polarizing means associated with the antenna for adjusting the relative alignment of the antenna orientation and the polarization of the incoming signals, an automatic polarization control system comprising
- means for producing an electrical control signal for controlling said polarizing means to adjust said relative alignment,
- means for detecting the noise level apart from the signal level in the satellite signals received by the antenna, and
- means responsive to the detected noise level for adjusting said control signal, and thereby adjusting said polarizing means, to minimize the detected noise level.
In a TVRO earth station having an antenna for receiving incoming satellite signals and polarizing means associated with the antenna for adjusting the relative alignment of the antenna orientation and the polarization of the incoming signals, an automatic polarization control system comprising
- means for producing an electrical control signal for controlling said polarizing means to adjust said relative alignment,
- means for detecting the noise level apart from the signal level in the satellite signals received by the antenna,
- means for adjusting said control signal through a predetermined range of values, and thereby adjusting said polarizing means through a predetermined range of settings, and
- means for determining the minimum noise level detected during the adjustments of said control signal and storing the control signal value corresponding to said minimum noise level.
Dependencies are inferred from the claim text.