Methods and systems for tracking signals with diverse polarization properties

• US 7,518,551 B2
• Filed: 06/29/2007
• Issued: 04/14/2009
• Est. Priority Date: 03/22/2004
• Status: Expired due to Term

• Current Assignee: Aerospace Corporation
• Original Assignee: Aerospace Corporation
• Inventors: Dybdal, Robert B., Pidhayny, Denny D.
• Primary Examiner(s): ALSOMIRI, ISAM A
• Application Number:
  US11/772,086
• Publication Number:
  US 20080012763A1
• Time in Patent Office: 655 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 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;

wherein the means for detecting orthogonally polarized signals of a tracking channel, determining which of the orthogonally polarized signals is stronger, and suppressing a cross polarization response of the tracking channel includes

means for combining the orthogonally polarized signals after the orthogonally polarized signals are detected.

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, and 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;

wherein the means for detecting orthogonally polarized signals of a tracking channel, determining which of the orthogonally polarized signals is stronger, and suppressing a cross polarization response of the tracking channel includes

two tracking receivers configured for detecting the orthogonally polarized signals, respectively, and

means for matching tracking amplitude responses of the two tracking receivers.