Device for tracking polarization

• US 8,289,208 B2
• Filed: 05/08/2008
• Issued: 10/16/2012
• Est. Priority Date: 06/11/2007
• Status: Expired due to Fees

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Ku, Bon-Jun, Ahn, Do-Seob, Lee, Ho-Jin
• Primary Examiner(s): Trinh, Sonny
• Application Number:
  US12/664,053
• Publication Number:
  US 20100164801A1
• Time in Patent Office: 1,622 Days
• Field of Search: 455/3.02, 455/427, 455/429, 455/12.1, 455/13.3, 455/25, 455/501, 455/63.1, 342/361, 342/358, 375/267
• US Class Current: 342/361
• CPC Class Codes: H04B 7/10 Polarisation diversity; Directional diversity

Abstract

Provided is a device for tracking polarizations. A receiving polarization tracking device includes a feeder for finding vertical and horizontal vector components by receiving vertical and horizontal polarizations, a polarization estimator for estimating distortion of polarizations using the vertical and horizontal vector components outputted from the feeder, a polarization controller for controlling amplitudes and phases of vertical and horizontal polarizations based on information about the estimated distortion from the polarization estimator and an output signal from the receiving polarization tracking device, and a combiner for combining the vertical and horizontal polarizations controlled from the polarization controller.

Claims

1. A receiving polarization tracking device, comprising:

a feeder for finding vertical and horizontal vector components by receiving vertical and horizontal polarizations

a polarization estimator for estimating distortion of polarizations using the vertical and horizontal vector components outputted from the feeder;

a polarization controller for controlling amplitudes and phases of vertical and horizontal polarizations based on information about the estimated distortion from the polarization estimator and an output signal from the receiving polarization tracking device; and

a combiner for combining the vertical and horizontal polarizations controlled from the polarization controller.

2. The receiving polarization tracking device of claim 1, the feeder has a cross dipole structure or a cross slot structure for receiving vertical and horizontal polarization signals.

3. The receiving polarization tracking device of claim 1, wherein the polarization estimator estimates the distortion of polarizations by finding a vertical weight and a horizontal weight using the vertical and horizontal vector components output from the feeder.

4. The receiving polarization tracking device of claim 1, wherein the polarization controller calculates an error by comparing the output signal of the receiving polarization tracking device with a target value.

5. The receiving polarization tracking device of claim 4, wherein the polarization controller changes the vertical weight and the horizontal weight using information about the estimated distortion from the polarization estimator and the calculated error to make the calculated error minimum.

6. The receiving polarization tracking device of claim 5, wherein the polarization controller includes a weight unit for generating a vertical polarization signal and a horizontal polarization signal by multiplying a weight changed by the polarization controller with the vertical and horizontal vector components received through the feeder, where the weight changed by the polarization controller is vertical and horizontal weights that make an error minimum.

7. The receiving polarization tracking device of claim 1, wherein the receiving polarization tracking device is applied to a single antenna and all elements of an array antenna for tracking polarization.

8. The receiving polarization tracking device of claim 1, wherein the polarization tracking device tracks a polarization by directly applying an antenna capable of transmitting and receiving two polarizations instead of a feeder capable of receiving two polarizations.

9. The receiving polarization tracking device of claim 1, wherein the receiving polarization tracking device divides a receiving path into a horizontal path and a vertical path, estimates divided polarizations, controls amplitudes and phases of divided signals, and combines the divided signals so as to track polarizations at a receiver in not only a satellite and a ground terminal but also a wireless communication system.

10. A transmitting polarization tracking device, comprising:

a divider for dividing a transmitting signal into horizontal and vertical vector components;

a polarization controller for controlling amplitudes and phases of a transmitting signal using the horizontal and vertical vector components from the divider and horizontal and vertical weights calculated from a receiving polarization tracking device; and

a feeder for transmitting horizontal and vertical polarization signals outputted from the polarization controller.

11. A transmitting polarization tracking device, comprising:

a divider for dividing a transmitting signal into horizontal and vertical vector components;

a polarization controller for controlling amplitudes and phases of a transmitting signal using the horizontal and vertical vector components from the divider and horizontal and vertical weights calculated from a receiving polarization tracking device; and

a feeder for transmitting horizontal and vertical polarization signals outputted from the polarization controller

wherein the polarization controller includes a weight unit for changing horizontal and vertical weights using information about the weights calculated by a receiving polarization tracking device.

12. The transmitting polarization tracking device of claim 11, wherein the polarization controller generates horizontal and vertical polarization signals by multiplying the horizontal and vertical weights obtained from the weight unit with horizontal and vertical vector components of a transmitting signal.

13. The transmitting polarization tracking device of claim 11, wherein the feeder has a cross dipole structure or a cross slot structure capable of transmitting vertical and horizontal polarization signals.

14. The transmitting polarization tracking device of claim 11, wherein the transmitting polarization tracking device is applied to a single antenna and all elements of an array antenna for tracking polarization.

15. The transmitting polarization tracking device of claim 11, wherein the transmitting polarization tracking device tracks a polarization by directly applying an antenna capable of transmitting and receiving two polarizations instead of a feeder capable of transmitting two polarizations.

16. The transmitting polarization tracking device of claim 11, wherein the transmitting polarization tracking device divides a transmitting path into a horizontal path and a vertical path, estimates divided polarizations, controls amplitudes and phases of divided signals, and combines the divided signals so as to track polarizations at a transmitter in not only a satellite and a ground terminal but also a wireless communication system.