System and method for improving GNSS receiver tracking loop performance under multipath signal interference

• US 10,051,437 B1
• Filed: 06/15/2016
• Issued: 08/14/2018
• Est. Priority Date: 07/24/2015
• Status: Active Grant

• Current Assignee: Marvell Asia Pte Limited (Marvell Technology Group Limited)
• Original Assignee: Marvell International Limited (Marvell Technology Group Limited)
• Inventors: Deng, Jiangping, Jia, Zhike, Cheng, Jian, Xu, Feng, Wang, Yongsong
• Primary Examiner(s): Qureshi, Afsar M
• Application Number:
  US15/182,763
• Time in Patent Office: 790 Days
• CPC Class Codes: H04L 27/2271 wherein the carrier recovery circuit uses only the demodulated signals
• CPC Class Codes: H04W 4/06 Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services

Abstract

A receiver including a plurality of correlators to receive a satellite signal having a line of sight (LOS) component and a multipath (MP) component and generate correlator results corresponding to the received satellite signal. The receiver includes a peak search module to identify frequency peaks in the received satellite signal based on the correlator results, a peak selection module to identify the LOS component of the received satellite signal based on the identified frequency peaks and at least one of a code phase error module to generate a code phase error corresponding to the identified LOS component and a carrier frequency error module to generate a carrier frequency error corresponding to the identified LOS component. The plurality of correlators are further to generate the correlator results based on at least one of the code phase error and the carrier frequency error.

Claims

1. A receiver, comprising:

a plurality of correlators to (i) receive a satellite signal having a line of sight (LOS) component and a multipath (MP) component and (ii) generate correlator results corresponding to the received satellite signal;

a peak search module to identify frequency peaks in the received satellite signal based on the correlator results;

a peak selection module to identify the LOS component of the received satellite signal based on the identified frequency peaks; and

at least one of (i) a code phase error module to generate a code phase error corresponding to the identified LOS component and (ii) a carrier frequency error module to generate a carrier frequency error corresponding to the identified LOS component,

wherein the plurality of correlators are further to generate the correlator results based on at least one of the code phase error and the carrier frequency error.

2. The receiver of claim 1, further comprising a fast Fourier transform (FFT) module to (i) generate FFT results based on the correlator results and (ii) provide the FFT results to the peak search module, wherein the FFT results include a frequency spectrum of the correlator results.

3. The receiver of claim 2, wherein the FFT results include M×

N FFT results, wherein M is a number of the plurality of correlators, and wherein N is a number of points of FFT processing performed by the FFT module.

4. The receiver of claim 2, wherein, to identify the frequency peaks, the peak search module is further to (i) identify a first peak in the frequency spectrum, (ii) compare the first peak to background noise, and (iii) selectively identify the first peak as a frequency peak based on the comparison.

5. The receiver of claim 4, wherein, to identify the frequency peaks, the peak search module is further to (i) identify a next peak in the frequency spectrum, (ii) compare the next peak to background noise and the first peak, and (iii) selectively identify the next peak as a frequency peak based on the comparison.

6. The receiver of claim 1, wherein, to identify the LOS component, the peak selection module is further to (i) receive respective code phase errors associated with the identified frequency peaks and (ii) identify the LOS component based on the respective code phase errors.

7. The receiver of claim 6, wherein, to identify the LOS component, the peak selection module is further to identify the LOS component according to the identified frequency peak having a largest code phase error.

8. The receiver of claim 6, wherein, to identify the LOS component, the peak selection module is further to identify the LOS component according to whether a largest code phase error of the respective code phase errors corresponds to a first identified peak of the identified frequency peaks.

9. The receiver of claim 6, wherein, to identify the LOS component, the peak selection module is further to identify the LOS component according to a comparison between a largest code phase error of the respective code phase errors and a first code phase error corresponding to a first identified peak of the identified frequency peaks.

10. The receiver of claim 1, wherein the plurality of correlators are further to selectively adjust a Doppler measurement using the generated carrier frequency error.

11. A method of operating receiver, the method comprising:

receiving, at a plurality of correlators, a satellite signal having a line of sight (LOS) component and a multipath (MP) component;

generating correlator results corresponding to the received satellite signal;

identifying frequency peaks in the received satellite signal based on the correlator results;

identifying the LOS component of the received satellite signal based on the identified frequency peaks;

at least one of (i) generating a code phase error corresponding to the identified LOS component and generating a carrier frequency error corresponding to the identified LOS component; and

generating the correlator results based on at least one of the code phase error and the carrier frequency error.

12. The method of claim 11, further comprising (i) generating FFT results based on the correlator results, wherein the FFT results include a frequency spectrum of the correlator results.

13. The method of claim 12, wherein the FFT results include M×

N FFT results, wherein M is a number of the plurality of correlators, and wherein N is a number of points of FFT processing performed.

14. The method of claim 12, wherein identifying the frequency peaks includes (i) identifying a first peak in the frequency spectrum, (ii) comparing the first peak to background noise, and (iii) selectively identifying the first peak as a frequency peak based on the comparison.

15. The method of claim 14, wherein identifying the frequency peaks includes (i) identifying a next peak in the frequency spectrum, (ii) comparing the next peak to background noise and the first peak, and (iii) selectively identifying the next peak as a frequency peak based on the comparison.

16. The method of claim 11, wherein identifying the LOS component includes (i) receiving respective code phase errors associated with the identified frequency peaks and (ii) identifying the LOS component based on the respective code phase errors.

17. The method of claim 16, wherein identifying the LOS component includes identifying the LOS component according to the identified frequency peak having a largest code phase error.

18. The method of claim 16, wherein identifying the LOS component includes identifying the LOS component according to whether a largest code phase error of the respective code phase errors corresponds to a first identified peak of the identified frequency peaks.

19. The method of claim 16, wherein identifying the LOS component includes identifying the LOS component according to a comparison between a largest code phase error of the respective code phase errors and a first code phase error corresponding to a first identified peak of the identified frequency peaks.

20. The method of claim 11, further comprising selectively adjusting a Doppler measurement using the generated carrier frequency error.