Method and apparatus capable of determining and utilizing radio wave directional information

• US 7,206,609 B2
• Filed: 04/29/2004
• Issued: 04/17/2007
• Est. Priority Date: 04/29/2004
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Li, Oinghua, Bettner, Allen W., Lin, Xintain E.
• Primary Examiner(s): Feild, Joseph
• Assistant Examiner(s): Doan, Phuoc
• Application Number:
  US10/835,167
• Publication Number:
  US 20050245286A1
• Time in Patent Office: 1,083 Days
• Field of Search: 455/12.1, 455/562, 455/424, 455/423, 370/294, 370/334, 340/10.1, 342/378
• US Class Current: 455/562.1
• CPC Class Codes: G01S 3/30 derived directly from separate directional systems

Abstract

Briefly, in accordance with one embodiment of the invention, an apparatus comprises a plurality of RF antennas, the plurality of RF antennas have a calibrated radiation pattern. The apparatus may further comprise a directional finding program that receives RF signal information from said plurality of RF antennas and RF antenna calibrated radiation pattern information and then calculates the direction from which said RF signals emanate relative to said apparatus.

Claims

1. An apparatus comprising:

a plurality of RF antennas, said plurality of RF antennas having a calibrated radiation pattern; and

a calculation circuit using a directional finding program which receives RF signal information from said plurality of RF antennas and RF antenna calibrated radiation pattern information and calculates the direction from which said RF signals emanate relative to said apparatus, wherein said direction finding program is Max(abs(S_i)/max(abs(D_i(theta))), where D_i is the antenna radiation pattern at a given angle theta and S is the input signal information with i representing the number of antennas.

2. The apparatus of claim 1, wherein said plurality of RF antennas are 3 or more non-colinear omni directional antennas.

3. The apparatus of claim 1, wherein said plurality of RF antennas are 3 or more directional antennas.

4. The apparatus of claim 1, wherein said plurality of RF antennas are 2 directional antennas with asymmetric patterns with respect to the separation between the phase center of said 2 directional antennas.

5. The apparatus of claim 1, wherein said plurality of RF antennas are 3 or more collinear antennas with asymmetric radiation patterns.

6. The apparatus of claim 1, wherein said calibrated radiation pattern associated with each of said plurality of RF antennas is measured to take into account a predetermined usage model.

7. apparatus of claim 6, wherein said usage model is selected from the group consisting of:

a clam shell laptop computer, a PDA or a tablet.

8. The apparatus of claim 1, wherein said directional finding program can receive input (S_i) sequentially or in parallel.

9. The apparatus of claim 3, wherein said 3 or more directional antennas are 3 or more directional antennas with peaks spaced apart.

10. The apparatus of claim 1, wherein said direction from which said RF signals emanate relative to said apparatus is the Angle of Arrival (AoA) information.

11. The apparatus of claim 1, further comprising a display for displaying said direction from which said RF signals emanate relative to said apparatus.

12. A method capable of determining radio wave directional information relative to an apparatus, comprising:

calibrating a radiation pattern for a plurality of RF antennas associated with said apparatus, said antennas capable of receiving RF signals; and

using a calculation circuit to calculate directional information of said RF signals, said calculation performed by a program that uses said RF signal information from said plurality of RF antennas and said RF antenna calibrated radiation pattern information, wherein said direction finding program is Max(abs(S_i)/max(abs(D_i(theta))), where D_i is the antenna radiation pattern at a given angle theta and S is the input signal information and i representing the number of antennas.

13. The method of claim 12, wherein said plurality of RF antennas are 3 or more non-colinear omni directional antennas.

14. The method of claim 12, wherein said plurality of RF antennas are 3 or more directional antennas.

15. The method of claim 12, wherein said 3 or more directional antennas are 3 or more directional antennas with peaks spaced apart.

16. The method of claim 12, wherein said plurality of RF antennas are 3 or more collinear antennas with asymmetric radiation patterns.

17. The method of claim 12, wherein said calibrated radiation pattern associated with each of said plurality of RF antennas is calculated to take into account a predetermined usage model.

18. The method of claim 17, wherein said usage model is a clam shell laptop computer PDA or tablet.

19. The method of claim 12, wherein said directional finding program can receive input (S_i) sequentially or in parallel.

20. The method of claim 12, wherein said plurality of RF antennas are 2 directional antennas with an asymmetric pattern with respect to the separation between the phase center of said directional antennas.

21. The method of claim 12, further comprising displaying said direction from which said RF signals emanate relative to said apparatus.

22. A system comprising:

a wireless device within said system including a computation circuit with a directional finding program;

at least two RF antennas associated with said wireless device and capable of receiving RF signals; and

said computation circuit with a directional finding program determines an angle of arrival of said RF signals relative to said wireless device, and wherein said direction finding program is Max(abs(S_i)/max(abs(D_i(theta))), where D_i is the antenna radiation pattern at a given angle theta and S is the input signal information with i representing the number of antennas.

23. The system of claim 22, wherein each of said at least two RF antennas have a calibrated radiation pattern and said directional finding program uses said antenna calibrated radiation pattern information and received RF signal information to determine said angle of arrival of said RF signals relative to said wireless device.

24. The system of claim 22, wherein said wireless device is a WLAN equipped personal computer.

25. The system of claim 22, wherein said at least two RF antennas are non-colinear omni directional antennas.

26. The system of claim 22, wherein said at least two RF antennas are at least two directional antennas.

27. The system of claim 25, wherein said at least two directional antennas are at least two directional antennas with peaks spaced apart.

28. The system of claim 22, wherein said directional finding program can receive input (S_i) sequentially or in parallel.

29. The system of claim 22, further comprising a display for displaying said angle of arrival of said RF signals relative to said wireless device.