Navigation system with a signal processor

• US 8,031,115 B2
• Filed: 12/30/2009
• Issued: 10/04/2011
• Est. Priority Date: 01/21/2009
• Status: Active Grant

• Current Assignee: O2 Micro International Limited (O2 Micro Incorporated)
• Original Assignee: O2 Micro International Limited (O2 Micro Incorporated)
• Inventors: Yu, Xiaoguang, Zhang, Weihua, Wang, James
• Primary Examiner(s): Tarcza, Thaomas
• Assistant Examiner(s): MCGUE, FRANK J
• Application Number:
  US12/650,243
• Publication Number:
  US 20110006946A1
• Time in Patent Office: 643 Days
• Field of Search: 342/357.69
• US Class Current: 342/357.69
• CPC Class Codes: G01S 19/30 code related G01S19/246 takes precedence

Abstract

A signal processor for processing multiple satellite signals is disclosed. The signal processor includes multiple acquisition channels operable for capturing tracking information from a first plurality of satellite signals synchronously according to multiple correlations between multiple reference coarse acquisition (C/A) codes and the first plurality of satellite signals. The signal processor further includes multiple code generators coupled to the acquisition channels and operable for generating the reference C/A codes to the acquisition channels.

Claims

1. A signal processor comprising:

a plurality of acquisition channels operable for capturing tracking information from a first plurality of satellite signals synchronously according to a plurality of correlations between a plurality of reference coarse acquisition (C/A) codes and said first plurality of satellite signals;

a first plurality of code generators coupled to said acquisition channels and operable for generating said reference C/A codes to said acquisition channels; and

a configurator coupled to said acquisition channels and operable for selecting an available acquisition channel and selecting an available code generator and for allocating said available code generator to said available acquisition channel.

2. The signal processor of claim 1, wherein each of said acquisition channels determines whether, according to said correlations, a second plurality of satellite signals are included in said first plurality of satellite signals, and wherein each of said acquisition channels also captures tracking information from instances of said second plurality of satellite signals.

3. The signal processor of claim 1, wherein said configurator is further operable for allocating a plurality of satellites to each of said acquisition channels, wherein said acquisition channels instruct said first plurality of code generators to generate said reference C/A codes for said allocated satellites.

4. The signal processor of claim 1, wherein each of said acquisition channels comprises:

a plurality of phase shifters, each of said phase shifters operable for shifting an initial phase of one of said reference C/A codes with a predetermined value; and

a plurality of correlation cores coupled to said phase shifters, each of said correlation cores operable for calculating instances of said correlations, wherein each of said correlations is between said one of said reference C/A codes with a phase shifted by a corresponding one of said phase shifters and said satellite signals.

5. The signal processor of claim 1, further comprising a plurality of tracking channels coupled to said acquisition channels and operable for tracking corresponding satellites synchronously according to said tracking information captured from said first plurality of satellite signals, wherein said configurator is further operable for selecting an available tracking channel to receive tracking information from said available acquisition channel.

6. The signal processor of claim 5, further comprising a second plurality of code generators coupled to said tracking channels and operable for generating, based on said tracking information, C/A codes for said corresponding satellites with certain phases to said tracking channels.

7. A method comprising:

capturing tracking information from a first plurality of satellite signals synchronously using a plurality of acquisition channels according to a plurality of correlations between a plurality of reference coarse acquisition (C/A) codes and said first plurality of satellite signals;

generating said reference C/A codes using a first plurality of code generators to said acquisition channels;

selecting an available acquisition channel;

selecting an available code generator; and

allocating said available code generator to said available acquisition channel.

8. The method of claim 7, further comprising:

determining whether, according to said correlations, a second plurality of satellite signals are included in said first plurality of satellite signals by each of said acquisition channels; and

capturing tracking information from instances of said second plurality of satellite signals by each of said acquisition channels.

9. The method of claim 7, further comprising:

allocating a plurality of satellites to each of said acquisition channels; and

instructing said first plurality of code generators to generate said reference C/A codes for said allocated satellites.

10. The method of claim 7, further comprising:

shifting an initial phase of one of said reference C/A codes by a plurality of predetermined values; and

calculating instances of said correlations, wherein each of said correlations is between said one of said reference C/A codes with a phase shifted by a corresponding one of said predetermined values from said initial phase and said satellite signals.

11. The method of claim 7, further comprising:

tracking corresponding satellites synchronously using a plurality of tracking channels according to said tracking information captured from said first plurality of satellite signals; and

selecting an available tracking channel to receive tracking information from said available acquisition channel.

12. The method of claim 11, further comprising:

based on said tracking information, generating C/A codes for said corresponding satellites with certain phases using a second plurality of code generators to said tracking channels.

13. A global positioning system (GPS) receiver, comprising:

a signal processor, said signal processor comprising;

a plurality of acquisition channels operable for capturing tracking information from a first plurality of satellite signals synchronously according to correlations between a plurality of reference coarse acquisition (C/A) codes and said first plurality of satellite signals;

a plurality of code generators; and

a configurator coupled to said generators and said acquisition channels, wherein said configurator is operable for selecting a first set of available code generators from said plurality of code generators to generate said reference C/A codes to said acquisition channels and for allocating said available code generators to said acquisition channels.

14. The GPS receiver of claim 13, wherein each of said acquisition channels determines whether, according to said correlations, a second plurality of satellite signals are included in said first plurality of satellite signals, and wherein each of said acquisition channels also captures tracking information from instances of said second plurality of satellite signals.

15. The GPS receiver of claim 13, wherein said configurator allocates a plurality of satellites to each of said acquisition channels, wherein said acquisition channels instruct said first set of code generators to generate said reference C/A codes for said allocated satellites.

16. The GPS receiver of claim 13, wherein said first set of code generators become available if said acquisition channels complete operations of capturing said tracking information from said first plurality of satellite signals.

17. The GPS receiver of claim 13, wherein each of said acquisition channels comprises:

a plurality of phase shifters, each of said phase shifters operable for shifting an initial phase of one of said reference C/A codes with a predetermined value; and

a plurality of correlation cores coupled to said phase shifters, each of said correlation cores operable for calculating instances of said correlations, wherein each of said correlations is between said one of said reference C/A codes with a phase shifted by a corresponding one of said phase shifters and said satellite signals.

18. The GPS receiver of claim 13, wherein said signal processor further comprises a plurality of tracking channels coupled to said acquisition channels and operable for tracking corresponding satellites synchronously according to said tracking information captured from said first plurality of satellite signals, wherein said configurator is further operable for selecting tracking channels to receive tracking information from said acquisition channels.

19. The signal processor of claim 18, wherein said configurator selects a second set of available code generators from said plurality of code generators to generate, based on said tracking information, C/A codes for said corresponding satellites with certain phases to said tracking channels.

20. The GPS receiver of claim 19, wherein said second set of code generators become available if said tracking channels complete operations of tracking said corresponding satellites.