System for standard positioning service and precise positioning service cooperative operation

• US 7,679,552 B2
• Filed: 09/04/2007
• Issued: 03/16/2010
• Est. Priority Date: 12/24/2003
• Status: Active Grant

• Current Assignee: Trimble Navigation Limited (Trimble Inc.)
• Original Assignee: Trimble Navigation Limited (Trimble Inc.)
• Inventors: Dentinger, Michael, Spratlin, Kenneth M
• Primary Examiner(s): Tarcza; Thomas H
• Assistant Examiner(s): Mull; Fred H
• Application Number:
  US11/899,312
• Publication Number:
  US 20090135054A1
• Time in Patent Office: 924 Days
• Field of Search: 342/357.02, 342/357.01, 342/357.06, 342/358, 701/200, 701/207, 701213-215
• US Class Current: 342/357.59
• CPC Class Codes: G01S 19/18 Military applications
• CPC Class Codes: G01S 19/20 Integrity monitoring, fault detection or fault isolation of space segment
• CPC Class Codes: G01S 19/215 issues related to spoofing
• CPC Class Codes: G01S 19/25 involving aiding data received from a cooperating element, e.g. assisted GPS
• CPC Class Codes: G01S 19/32 Multimode operation in a single same satellite system, e.g. GPS L1/L2
• CPC Class Codes: G01S 5/0072 Transmission between mobile stations, e.g. anti-collision systems

Abstract

A system for standard positioning service (SPS) and precise positioning service (PPS) cooperative operation is disclosed. In one embodiment, a PPS receiver is utilized to process a PPS data portion of a positioning signal. In addition, an SPS receiver is utilized to process an SPS data portion of the positioning signal. Furthermore, the PPS receiver and the SPS receiver are communicatively coupled such that the PPS data portion from the PPS receiver is cross-validated with the SPS data portion from the SPS receiver thereby corroborating the accuracy of the positioning signal.

Claims

1. A system for clear and secure cooperative operation comprising:

a secure receiver to process an secure data portion of a first positioning signal; and

a clear receiver to process a clear data portion of a second positioning signal, wherein the secure receiver and the clear receiver are communicatively coupled such that the secure data portion from the secure receiver is cross validated with the clear data portion from the clear receiver thereby corroborating the accuracy of either the first positioning signal or the second positioning signal and wherein the clear receiver provides the first position information to said secure receiver, such that the capabilities of the secure receiver can be accessed without the secure receiver actually acquiring the first positioning signal.

2. The system of claim 1 wherein said clear data portion is received from a GPS positioning signal.

3. The system of claim 1 wherein said secure receiver is utilized to aid the clear receiver in acquiring said second positioning signal.

4. The system of claim 3 wherein up-to-date satellite locations and strengths are provided from said secure receiver to said clear receiver to aid the clear receiver in acquiring said second positioning signal.

5. The system of claim 3 wherein said secure receiver is periodically turned on and off after said secure receiver aids said clear receiver in acquiring said second positioning signal.

6. The system of claim 1 further comprising:

a first position evaluator for evaluating said first position signal from said clear receiver;

a second position evaluator for evaluating said second position signal from said secure receiver;

a selector for selecting portions of the first position signal and the second position signal based on the quality of said position signal; and

a data combiner for combining said selected portions of the first position signal and the second position signal to provide a combined performance, functionality and integrity navigation system.

7. The system of claim 1 further comprising:

a third receiver to aid the secure receiver in acquiring said first positioning signal or the clear receiver in acquiring said second positioning signal.

8. The system of claim 1 further comprising:

a user selection option for allowing a user to select either the clear receiver or the secure receiver for navigation operation.

9. The system of claim 1 further comprising:

a standard form factor interface for both said secured receiver and said clear receiver, such that said secured receiver and said clear receiver are cooperatively operational.

10. The system of claim 9, wherein said standard form factor interface is selected from the list consisting of:

a personal computer memory card interface architecture (CPMCIA), a compact PCI card and a compact flash card.

11. The system of claim 1, wherein the clear data portion of the second positioning signal is CA code on an L1 band.

12. The system of claim 1, wherein the secure data portion of the first position signal is P code or encoded Y code on the L1 band or an L2 band.

13. The system of claim 1, wherein the secure receiver includes a KDP (key data processor) adapted to receive a CV (crypto variable) from an external keying device, the KDP operable for generating Crypto Variable Anti Spoofing (Cvas) and selective availability (SA) correction information.

14. The system of claim 1, wherein the secure receiver and the clear receiver each have a distinct antenna for receiving the positioning signal.

15. The system of claim 1 wherein the secure receiver and the clear receiver utilize the same antenna for receiving the positioning signal.

16. A system for clear and secure cooperative operation comprising:

a secure receiver to process an secure data portion of a first positioning signal; and

a clear receiver to process a clear data portion of a second positioning signal, wherein the secure receiver and the clear receiver are communicatively coupled such that the secure data portion from the secure receiver is cross validated with the clear data portion from the clear receiver thereby corroborating the accuracy of either the first positioning signal or the second positioning signal and wherein the secure receiver provides the second position information to said clear receiver, such that the capabilities of the clear receiver can be accessed without the clear receiver actually acquiring the second positioning signal.

17. The system of claim 16, wherein the clear data portion of the second positioning signal is CA code on an L1 band.

18. The system of claim 16, wherein the secure data portion of the first position signal is P code or encoded Y code on the L1 band or an L2 band.

19. The system of claim 16, wherein the secure receiver includes a KDP (key data processor) adapted to receive a CV (crypto variable) from an external keying device, the KDP operable for generating Crypto Variable Anti Spoofing (Cvas) and selective availability (SA) correction information.

20. The system of claim 16, wherein the secure receiver and the clear receiver each have a distinct antenna for receiving the positioning signal.

21. The system of claim 16, wherein the secure receiver and the clear receiver utilize the same antenna for receiving the positioning signal.

22. The system of claim 16 wherein the clear receiver aids the secure receiver in acquiring said first positioning signal.

23. The system of claim 16 wherein up-to-date satellite locations and strengths are provided from said clear receiver to said secure receiver to aid the secure receiver in acquiring said first positioning signal.