Method for detecting navigation beacon signals using two antennas or equivalent thereof

• US 7,362,268 B2
• Filed: 06/22/2005
• Issued: 04/22/2008
• Est. Priority Date: 05/11/2005
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Jalali, Ahmad, Wengler, Michael James
• Primary Examiner(s): PHAN, DAO LINDA
• Application Number:
  US11/165,281
• Publication Number:
  US 20060256009A1
• Time in Patent Office: 1,035 Days
• Field of Search: 342/378, 342/382, 342/383, 342/434
• US Class Current: 342/378
• CPC Class Codes: G01S 19/21 Interference related issues ; Issues related to cross-correlation, spoofing or other methods of denial of service
• CPC Class Codes: G01S 19/36 relating to the receiver frond end
• CPC Class Codes: G01S 2013/466 by Trilateration, i.e. two antennas or two sensors determine separately the distance to a target, whereby with the knowledge of the baseline length, i.e. the distance between the antennas or sensors, the position data of the target is determined
• CPC Class Codes: G01S 5/0215 Interference
• CPC Class Codes: H04B 7/0854 using error minimizing algorithms, e.g. minimum mean squared error [MMSE], "cross-correlation" or matrix inversion

Abstract

A method for detecting a plurality of navigation beacon signals by using either two antennas or a synthetic aperture antenna for receiving a plurality of distinct measurements, and combining the plurality of distinct measurements using a plurality of antenna weight components to form an interference cancellation beam. In one embodiment, the plurality of antenna weight components is determined by eigenvalue processing. In another embodiment, the plurality of antenna weight components is determined by simplified processing. In another aspect, a single antenna is used for receiving an originally received measurement. A copy of the originally received measurement is made and processed to achieve the proper time delay to emulate spatial diversity. The originally received measurement and the processed copy are combined to form an interference cancellation beam.

Claims

1. A method for detecting a plurality of navigation beacon signals comprising:

using a synthetic aperture antenna for receiving a plurality of distinct measurements of radio energy; and

combining the plurality of distinct measurements using a plurality of antenna weight components to form an interference cancellation beam.

2. The method of claim 1 wherein the plurality of antenna weight components is determined by eigenvalue processing.

3. The method of claim 1 wherein the plurality of antenna weight components is determined by simplified processing.

4. The method of claim 3 wherein each of the plurality of antenna weight components is a complex voltage of a strongest navigation beacon signal.

5. The method of claim 3 wherein each of the plurality of antenna weight components is the sum of complex voltages of a plurality of strongest navigation beacon signals.

16. The method recited in claim 1, wherein the synthetic aperture antenna is contained in a wireless handset.

6. A method for detecting a plurality of navigation beacon signals comprising:

using an antenna for receiving an originally received measurement of radio energy;

making a copy of the originally received measurement and processing the copy of the originally received measurement by matching time delay for emulating spatial diversity to result in a processed copy; and

combining the originally received measurement with the processed copy using two antenna weight components to form an interference cancellation beam.

7. The method of claim 6 wherein the two antenna weight components are determined by eigenvalue processing.

8. The method of claim 6 wherein the two antenna weight components are determined by simplified processing.

9. The method of claim 8 wherein each of the two antenna weight components is a complex voltage of a strongest navigation beacon signal.

10. The method of claim 8 wherein each of the two antenna weight components is the sum of complex voltages of a plurality of strongest navigation beacon signals.

11. Computer readable media embodying a program of instructions executable by a computer program to perform a method for detecting a plurality of navigation beacon signals, the method comprising:

using a synthetic aperture antenna for receiving a plurality of distinct measurements of radio energy; and

combining the plurality of distinct measurements using a plurality of antenna weight components to form an interference cancellation beam.

17. The method recited in claim 11, wherein the synthetic aperture antenna is contained in a wireless handset.

12. Computer readable media embodying a program of instructions executable by a computer program to perform a method for detecting a plurality of navigation beacon signals, the method comprising:

using an antenna for receiving an originally received measurement of radio energy;

making a copy of the originally received measurement and processing the copy of the originally received measurement by matching time delay for emulating spatial diversity to result in a processed copy; and

combining the originally received measurement with the processed copy using two antenna weight components to form an interference cancellation beam.

13. An integrated circuit to implement a method for detecting a plurality of navigation beacon signals, the method comprising:

using a synthetic aperture antenna for receiving a plurality of distinct measurements of radio energy; and

combining the plurality of distinct measurements using a plurality of antenna weight components to form an interference cancellation beam.

18. The method recited in claim 13, wherein the synthetic aperture antenna is contained in a wireless handset.

14. An integrated circuit to implement a method for detecting a plurality of navigation beacon signals, the method comprising:

using an antenna for receiving an originally received measurement of radio energy;

making a copy of the originally received measurement and processing the copy of the originally received measurement by matching time delay for emulating spatial diversity to result in a processed copy; and

combining the originally received measurement with the processed copy using two antenna weight components to form an interference cancellation beam.

15. A receiver to detect a plurality of navigation beacon signals, comprising:

a first antenna to receive a first distinct measurement of radio energy; and

a second antenna to receive a second distinct measurement of radio energy,

wherein said first and second distinct measurement of radio energy is combined using two antenna weight components to form an interference cancellation beam,

wherein said first and said second antenna are contained within said receiver.