Methods and systems for tracking signals with diverse polarization properties

• US 7,239,275 B2
• Filed: 03/22/2004
• Issued: 07/03/2007
• Est. Priority Date: 03/22/2004
• Status: Active Grant

• Current Assignee: Aerospace Corporation
• Original Assignee: Aerospace Corporation
• Inventors: Dybdal, Robert B., Pidhayny, Denny D.
• Primary Examiner(s): Tarcza; Thomas H.
• Assistant Examiner(s): ALSOMIRI, ISAM A
• Application Number:
  US10/807,587
• Publication Number:
  US 20050227659A1
• Time in Patent Office: 1,198 Days
• Field of Search: 342/80, 342/149, 342/159, 342362-364, 455295-296
• US Class Current: 342/362
• CPC Class Codes: H04B 7/10 Polarisation diversity; Directional diversity

Abstract

Methods and systems for tracking signals with diverse polarization properties address both sensitivity and antenna tracking performance issues. In one embodiment, complex weightings for matching a polarization of an incident signal on a data channel are determined, and the complex weightings are applied to a tracking channel such that an antenna system polarization is matched to the polarization of the incident signal. In another embodiment, orthogonally polarized tracking channel components of an incident signal are processed to make a determination as to which of the orthogonally polarized tracking channel components is stronger, and this determination is used to select a polarization of a data channel to reduce a polarization mismatch loss.

Claims

1. A method for antenna tracking, comprising:

processing orthogonally polarized tracking channel components of an incident signal at a tracking channel to make a determination as to which of the orthogonally polarized tracking channel components is stronger;

using the determination to select a polarization of a data channel, which is a different channel than the tracking channel, to reduce a polarization mismatch loss; and

using the determination to track the direction of the incident signal to minimize antenna pointing loss.

2. A system for antenna tracking, comprising:

means for detecting orthogonally polarized signals of a tracking channel, determining which of the orthogonally polarized signals is stronger, suppressing a cross polarization response of the tracking channel, and increasing the accuracy of tracking of incident signal direction to minimize antenna pointing loss; and

a controller configured to select a polarization of a data channel depending upon which of the orthogonally polarized signals is stronger;

wherein the tracking channel and the data channel are two different channels.

3. A system for antenna tracking comprising:

means for detecting orthogonally polarized signals of a tracking channel, determining which of the orthogonally polarized signals is stronger, suppressing a cross polarization response of the tracking channel, and increasing the accuracy of tracking of incident signal direction to minimize antenna pointing loss; and

a controller configured to select a polarization of a data channel depending upon which of the orthogonally polarized signals is stronger;

wherein the means for detecting orthogonally polarized signals of a tracking channel, determining which of the orthogonally polarized signals is stronger, suppressing a cross polarization response of the tracking channel, and increasing the accuracy of tracking of incident signal direction to minimize antenna pointing loss includes

a tracking receiver configured to switch between tracking channel inputs for the orthogonally polarized signals and to generate sequential orthogonal polarization outputs, and

a sequential summer configured to receive the sequential orthogonal polarization outputs and to provide an antenna control unit (ACU) input signal; and

wherein the controller is configured to select the polarization of the data channel based on the higher signal level from the sequential orthogonal polarization outputs.