Wide-lane pseudorange measurements using FM signals

• US 7,498,873 B2
• Filed: 10/31/2006
• Issued: 03/03/2009
• Est. Priority Date: 11/02/2005
• Status: Active Grant

• Current Assignee: Skyhook Holding, Inc. (Liberty Broadband Corp.)
• Original Assignee: Rosum Corporation (Liberty Broadband Corp.)
• Inventors: Flammer, George, Lee, Andy, Opshaug, Guttorm, Furman, Scott, Samra, Harvind, Burgess, David, Rabinowitz, Matthew
• Primary Examiner(s): MIS, DAVID C
• Application Number:
  US11/554,765
• Publication Number:
  US 20070131079A1
• Time in Patent Office: 854 Days
• Field of Search: 329/315, 342/350, 455/205, 455/214, 455/337
• US Class Current: 329/315
• CPC Class Codes: G01S 11/02 using radio waves G01S19/00 takes precedence
• CPC Class Codes: G01S 5/12 by co-ordinating position lines of different shape, e.g. hyperbolic, circular, elliptical or radial

Abstract

Apparatus having corresponding methods and computer-readable media comprises a receiver to receive a wireless stereo frequency-modulation (FM) signal comprising a plurality of spectral signal components including a first tone and one or more frequency bands; one or more tone generators each to generate a respective second tone based on a respective one of the frequency bands; a plurality of phase circuits each to measure a phase of a respective one of the first and second tones; and a difference element to determine a phase difference between two of the phases.

Claims

1. An apparatus comprising:

a receiver to receive a wireless stereo frequency-modulation (FM) signal comprising a plurality of spectral signal components including a first tone and one or more frequency bands;

one or more tone generators each to generate a respective second tone based on a respective one of the frequency bands;

a plurality of phase circuits each to measure a phase of a respective one of the first and second tones; and

a difference element to determine a phase difference between two of the phases.

2. The apparatus of claim 1:

wherein a location of the receiver is determined based on the phase difference.

3. The apparatus of claim 2, further comprising:

a processor to determine the location of the receiver based on the phase difference.

4. The apparatus of claim 1, wherein each of the tone generators comprises:

a squaring element to generate an output comprising the respective one of the second tones by squaring the respective one of the frequency bands.

5. The apparatus of claim 1, wherein each of the tone generators further comprises:

a bandpass filter to filter the output of the respective squaring element.

6. The apparatus of claim 1, further comprising:

an analog-to-digital converter to digitize the FM signal before the tone generators generate the respective second tones.

7. An apparatus comprising:

receiver means for receiving a wireless stereo frequency-modulation (FM) signal comprising a plurality of spectral signal components including a first tone and one or more frequency bands;

one or more tone generator means each for generating a respective second tone based on a respective one of the frequency bands;

plurality of phase circuit means each for measuring a phase of a respective one of the first and second tones; and

difference means for determining a phase difference between two of the phases.

8. The apparatus of claim 7:

wherein a location of the receiver is determined based on the phase difference.

9. The apparatus of claim 8, further comprising:

processor means for determining the location of the receiver based on the phase difference.

10. The apparatus of claim 7, wherein each of the tone generator means comprises:

squaring means for generating an output comprising the respective one of the second tones by squaring the respective one of the frequency bands.

11. The apparatus of claim 7, wherein each of the tone generator means further comprises:

bandpass filter means for filtering the output of the respective squaring element.

12. The apparatus of claim 7, further comprising:

analog-to-digital converter means for digitizing the FM signal before the tone generator means generate the respective second tones.

13. A method comprising:

receiving a wireless stereo frequency-modulation (FM) signal comprising a plurality of spectral signal components including a first tone and one or more frequency bands;

generating one or more second tones each based on a respective one of the frequency bands;

measuring phases of a plurality of the first and second tones; and

determining a phase difference between two of the phases.

14. The method of claim 13:

wherein a location of the receiver is determined based on the phase difference.

15. The method of claim 14, further comprising:

determining the location of the receiver based on the phase difference.

16. The method of claim 13, wherein generating each of the second tones comprises:

generating an output comprising the respective one of the second tones by squaring the respective one of the frequency bands.

17. The method of claim 13, wherein generating each of the second tones further comprises:

filtering the output.

18. The method of claim 13, further comprising:

digitizing the FM signal before generating the respective second tones.

19. Computer-readable media embodying instructions executable by a computer to perform a method comprising:

generating one or more second tones each based on a respective frequency bands in a wireless stereo frequency-modulation (FM) signal comprising a plurality of spectral signal components including a first tone and one or more of the frequency bands;

measuring phases of a plurality of the first and second tones; and

determining a phase difference between two of the phases.

20. The media of claim 19:

wherein a location of the receiver is determined based on the phase difference.

21. The media of claim 20, wherein the method further comprises:

determining the location of the receiver based on the phase difference.

22. The media of claim 19, wherein generating each of the second tones comprises:

generating an output comprising the respective one of the second tones by squaring the respective one of the frequency bands.

23. The media of claim 19, wherein generating each of the second tones further comprises:

filtering the output.

24. The media of claim 19:

wherein the FM signal is digitized before generating the respective second tones.