Wide-lane pseudorange measurements using FM signals
View Patent ↗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.
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.