Method for standard positioning service and precise positioning service cooperative operation

• US 6,934,631 B2
• Filed: 08/13/2003
• Issued: 08/23/2005
• Est. Priority Date: 08/13/2003
• Status: Expired due to Term

• Current Assignee: Trimble Navigation Limited (Trimble Inc.)
• Original Assignee: Trimble Navigation Limited (Trimble Inc.)
• Inventors: Dentinger, Michael, Spratlin, Kenneth M
• Primary Examiner(s): Beaulieu, Yonel
• Application Number:
  US10/640,751
• Publication Number:
  US 20050038601A1
• Time in Patent Office: 741 Days
• Field of Search: 701/200, 701/207, 701214-215, 342/350, 342/357.02
• US Class Current: 701/213
• 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 method for standard positioning service (SPS) and precise positioning service (PPS) cooperative operation is disclosed. In one embodiment, a positioning signal is received. A PPS data portion of the positioning signal is acquired with a PPS receiver. An SPS data portion of the positioning signal is acquired with an SPS receiver. The PPS receiver and the SPS receiver are then communicatively coupled. The PPS data portion from the PPS receiver is then cross-validated with the SPS data portion from the SPS receiver, wherein the cross validation of the PPS data portion and the SPS data portion provides information about the validity of the positioning signal.

Claims

1. A method for standard positioning service (SPS) and precise positioning service (PPS) cooperative operation comprising:

a) receiving a positioning signal;

b) acquiring a PPS data portion of the positioning signal with a PPS receiver;

c) outputting a portion of the PPS data portion;

d) receiving the portion of the PPS data portion with an SPS receiver; and

e) processing the portion of the PPS data portion with the SPS receiver such that the operational capabilities of the SPS receiver are functional when the SPS receiver has not acquired an SPS portion of the positioning signal.

2. The method as recited in claim 1 further comprising:

f) acquiring the SPS data portion of the positioning signal with an SPS receiver.

3. The method as recited in claim 2 further comprising:

g) cross-validating the PPS data portion from the PPS receiver with the SPS data portion from the SPS receiver, wherein the cross validation of the PPS data portion and the SPS data portion provides information about the validity of the positioning signal.

4. The method of claim 2 wherein the SPS data portion of the positioning signal is CA code on the L1 band.

5. The method of claim 3 wherein during the cross-validating of the PPS data portion with the SPS data portion, the PPS data portion is selected as the correct data portion if the cross-validation does not agree.

6. The method of claim 1 wherein the PPS data portion of the positioning signal is P code or encoded Y code on the L1 band or the L2 band.

7. The method of claim 1 wherein the PPS 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.

8. The method of claim 1 wherein the SPS receiver utilizes the portion of the PPS data portion to assist the SPS receiver in acquiring the SPS data portion of the positioning signal.

9. A method for standard positioning service (SPS) and precise positioning service (PPS) cooperative operation comprising:

a) receiving a positioning signal;

b) acquiring an SPS data portion of the positioning signal with an SPS receiver; and

c) outputting a portion of the SPS data portion;

d) receiving the portion of the SPS data portion with a PPS receiver;

e) processing the portion of the SPS data portion within the PPS receiver to provide operational capabilities for the PPS receiver during non-acquirable operation of the PPS receiver; and

f) operating the PPS in an invalid state.

10. The method as recited in claim 9 further comprising:

g) acquiring a PPS data portion of the positioning signal with a PPS receiver.

11. The method as recited in claim 10 further comprising:

h) cross-validating the PPS data portion from the PPS receiver with the SPS data portion from the SPS receiver, wherein the cross validation of the PPS data portion and the SPS data portion provides information about the validity of the positioning signal.

12. The method of claim 9 wherein the SPS data portion of the positioning signal is CA code on the L1 band.

13. The method of claim 10 wherein the PPS data portion of the positioning signal is P code or encoded Y code on the L1 band or the L2 band.

14. The method of claim 11 wherein during the cross-validating of the PPS data portion with the SPS data portion, the PPS data portion is selected as the correct data portion if the cross-validation does not agree.

15. The method of claim 9 wherein the PPS 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.

16. The method of claim 9 wherein the PPS receiver utilizes the portion of the SPS data portion to assist the PPS receiver in acquiring the PPS data portion of the positioning signal.