METHOD FOR PERFORMING CONSISTENCY CHECKS FOR MULTIPLE SIGNALS RECEIVED FROM A TRANSMITTER

• US 20100117884A1
• Filed: 11/11/2008
• Published: 05/13/2010
• Est. Priority Date: 11/11/2008
• Status: Abandoned Application

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Rowitch, Douglas Neal, Ahmed, Rizwan
• Application Number:
  US12/268,861
• Publication Number:
  US 20100117884A1
• Time in Patent Office: Days
• US Class Current: 342/14
• CPC Class Codes: G01S 19/21 Interference related issues ; Issues related to cross-correlation, spoofing or other methods of denial of service
• CPC Class Codes: G01S 19/22 Multipath-related issues
• CPC Class Codes: G01S 19/29 carrier including Doppler, related G01S19/246 takes precedence
• CPC Class Codes: G01S 19/32 Multimode operation in a single same satellite system, e.g. GPS L1/L2
• CPC Class Codes: G01S 19/41 Differential correction, e.g. DGPS [differential GPS]

Abstract

The subject matter disclosed herein relates to a system and method for processing multiple navigation signal components received from multiple global navigation satellite systems (GNSS′). In a particular implementation, an energy detection in a first navigation signal component is classified based, at least in part, on information in a second navigation signal component.

Claims

1. A method, comprising:

receiving a first navigation signal component and a second navigation signal component from a transmitter; and

classifying an energy detection in the first navigation signal component based at least in part on the second navigation signal component.

2. The method of claim 1, wherein the classifying comprises classifying the energy detection in the first navigation signal component as a false alarm in response to determining that the energy detection in the first navigation signal component is not correlated in at least one of Doppler and in code phase with an energy detection in the second navigation signal component.

3. The method of claim 1, wherein the classifying comprises comparing at least one characteristic between the energy detection in the first navigation signal component and an energy detection in the second navigation signal component.

4. The method of claim 3, wherein the at least one characteristic comprises at least one of a Carrier-to-Noise power ratio difference and a Doppler shift difference between the energy detection in the first navigation signal component and the energy detection in the second navigation signal component.

5. The method of claim 4, wherein the energy detection comprises a correlation peak.

6. The method of claim 1, further comprising implementing a jammer test on the first navigation signal component and the second navigation signal component.

7. The method of claim 1, wherein the classifying comprises determining whether both the energy detection in the first navigation signal component and an energy detection in the second navigation signal component are false alarms based, at least in part, on a determination that the energy detection in the first navigation signal component and the energy detection in the second navigation signal component are not correlated in at least one of Doppler and in code phase.

8. The method of claim 7, wherein the classifying further comprises classifying the energy detections in the first and second navigation signal components as false alarms based, at least in part, on a result of at least one test selected from the group of tests comprising a cross-correlation test and a jammer test.

9. The method of claim 1, wherein the classifying comprises determining that the energy detection in the first navigation signal component is not a false alarm based, at least in part, on:

a determination that the energy detection in the first navigation signal component and an energy detection in the second navigation signal component are not correlated in at least one of Doppler and in code phase; and

a determination that the energy detection in the first navigation signal component passes at least one signal test.

10. The method of claim 1, wherein the first navigation signal component is transmitted at a first carrier frequency, the second navigation signal component is transmitted at a second carrier frequency, the first carrier frequency being separated by at least 50 Mega Hz.

11. The method of claim 1, wherein the receiving and the classifying are each performed by at least two receivers of a device.

12. An apparatus, comprising:

a receiver to receive a first navigation signal component and a second navigation signal component from a transmitter; and

a processor to classify an energy detection in the first navigation signal component based at least in part on the second navigation signal component.

13. The apparatus of claim 12, wherein the processor is adapted to classify the energy detection in the first navigation signal component as a false alarm in response to determining that the first navigation signal component and the second navigation signal component are not correlated in at least one of Doppler and in code phase.

14. The apparatus of claim 12, wherein the processor is adapted to classify the energy detection in based, at least in part, on a comparison of at least one characteristic between the energy detection in the first navigation signal component and an energy detection in the second navigation signal component.

15. The apparatus of claim 14, wherein the at least one characteristic comprises at least one of a Carrier-to-Noise power ratio difference and a Doppler shift difference between the energy detection in the first navigation signal component and the energy detection in the second navigation signal component.

16. The apparatus of claim 12, wherein the processor is adapted to classify the energy detection based, at least in part, on an implementation of a jammer test on the first navigation signal component and the second navigation signal component.

17. The apparatus of claim 12, wherein the processor is adapted to classify the energy detection based, at least in part, on an implementation of a cross-correlation test on the first navigation signal component and the second navigation signal component.

18. The apparatus of claim 12, wherein the processor is adapted to determine that the energy detection in the first navigation signal component is not a false alarm based, at least in part, on:

a determination that the energy detection in the first navigation signal component and an energy detection in the second navigation signal component are not correlated in at least one of Doppler and in code phase; and

a determination that the energy detection in the first navigation signal component passes at least one signal test.

19. An apparatus, comprising:

receiving means for receiving a first navigation signal component and a second navigation signal component from a transmitter; and

processing means for classifying an energy detection in the first navigation signal component based at least in part on the second navigation signal component.

20. The apparatus of claim 19, wherein the processing means is adapted to classify the energy detection in based, at least in part, on a comparison of at least one characteristic between the energy detection in the first navigation signal component and an energy detection in the second navigation signal component.

21. The apparatus of claim 20, wherein the at least one characteristic comprises at least one of a Carrier-to-Noise power ratio difference and a Doppler shift difference between the energy detection in the first navigation signal component and the energy detection in the second navigation signal component.

22. The apparatus of claim 19, wherein the processing means is adapted to classify the energy detection in based, at least in part, on a cross-correlation test of the first navigation signal component and the second navigation signal component.

23. The apparatus of claim 19, wherein the processing means is adapted to classify the energy detection based, at least in part, on an implementation of a jammer test on the first navigation signal component and the second navigation signal component.

24. The apparatus of claim 19, wherein the processing means is adapted to determine whether the first navigation signal component and the second navigation signal component are false alarms based, at least in part, on a determination that the energy detection in the first navigation signal component and an energy detection in the second navigation signal component are not correlated in at least one of Doppler and in code phase.

25. An article comprising:

a storage medium comprising machine-readable instructions stored thereon which, if executed by a computing platform, are adapted to enable the computing platform to;

receive a first navigation signal component and a second navigation signal component from a transmitter; and

classify an energy detection in the first navigation signal component based at least in part on the second navigation signal component.

26. The article of claim 25, wherein the classifying the energy detection comprises classifying the energy detection in the first navigation signal component as a false alarm in response to determining that the energy detection in the first navigation signal component is not correlated in at least one of Doppler and in code phase with an energy detection in the second navigation signal component.

27. The article of claim 25, wherein the classifying the energy detection comprises comparing at least one characteristic between the energy detection in the first navigation signal component and an energy detection in the second navigation signal component.

28. The article of claim 27, wherein the at least one characteristic comprises at least one of a Carrier-to-Noise power ratio difference and a Doppler shift difference between the energy detection in the first navigation signal component and the energy detection in the second navigation signal component.

29. The article of claim 25, wherein the machine-readable instructions are further adapted to implement a jammer test on the first navigation signal component and the second navigation signal component.

30. The article of claim 25, wherein the classifying the energy detection comprises determining whether both the energy detection in the first navigation signal component and an energy detection in the second navigation signal component are false alarms based, at least in part, on a determination that the energy detection in the first navigation signal component and the energy detection in the second navigation signal component are not correlated in at least one of Doppler and in code phase.

31. The article of claim 30, wherein the classifying the energy detection further comprises classifying the energy detections in the first and second navigation signal components as false alarms based, at least in part, on a result of at least one test selected from the group of tests comprising a cross-correlation test and a jammer test.

32. The article of claim 25, wherein the classifying the energy detection comprises determining that the energy detection in the first navigation signal component is not a false alarm based, at least in part, on:

a determination that the energy detection in the first navigation signal component and an energy detection in the second navigation signal component are not correlated in at least one of Doppler and in code phase; and

a determination that the energy detection in the first navigation signal component passes at least one signal test.

33. A method, comprising:

receiving, by a first receiver, a navigation signal component from a transmitter and determining a first navigation signal component detection;

receiving, by a second receiver, the navigation signal component from the transmitter and determining a second navigation signal component detection;

classifying an energy detection in the navigation signal component based at least in part on the first and second navigation signal component detections.

34. The method of claim 33, wherein the classifying comprises classifying the energy detection in the navigation signal component as a false alarm in response to determining that the first navigation signal component detection is not correlated in at least one of Doppler and in code phase with the second navigation signal component detection.

35. The method of claim 33, wherein the classifying comprises comparing at least one characteristic between the first navigation signal component detection and the second navigation signal component detection.

36. The method of claim 35, wherein the at least one characteristic comprises at least one of a Carrier-to-Noise power ratio difference and a Doppler shift difference between the first navigation signal component detection and the second navigation signal component detection.

37. The method of claim 33, wherein the energy detection comprises a correlation peak.

38. The method of claim 33, further comprising implementing a jammer test on the first navigation signal component detection and the second navigation signal component detection.

39. An apparatus, comprising:

a first receiver to receive a navigation signal component from a transmitter and to determine a first navigation signal component detection;

a second receiver to receive the navigation signal component from the transmitter and to determine a second navigation signal component detection; and

a processor to classify an energy detection in the navigation signal component based at least in part on the first and second navigation signal component detections.

40. The apparatus of claim 39, wherein the processor is adapted to classify the energy detection in the navigation signal component as a false alarm in response to determining that the first and second navigation signal component detections are not correlated in at least one of Doppler and in code phase.

41. The apparatus of claim 39, wherein the processor is adapted to classify the energy detection in based, at least in part, on a comparison of at least one characteristic between the first navigation signal component detection and the second navigation signal component detection.

42. The apparatus of claim 41, wherein the at least one characteristic comprises at least one of a Carrier-to-Noise power ratio difference and a Doppler shift difference between the first navigation signal component detection and the second navigation signal component detection.

43. The apparatus of claim 39, wherein the processor is adapted to classify the energy detection based, at least in part, on an implementation of a jammer test on the first navigation signal component detection and the second navigation signal component detection.

44. The apparatus of claim 39, wherein the processor is adapted to classify the energy detection based, at least in part, on an implementation of a cross-correlation test on the first navigation signal component detection and the second navigation signal component detection.

45. An apparatus, comprising:

first receiving means for receiving a navigation signal component from a transmitter and for determining a first navigation signal component detection;

second receiving means for receiving the navigation signal component from the transmitter and for determining a second navigation signal component detection; and

processing means for classifying an energy detection in the navigation signal component based at least in part on the first and second navigation signal component detections.

46. The apparatus of claim 45, wherein the processing means is adapted to classify the energy detection in based, at least in part, on a comparison of at least one characteristic between the first navigation signal component detection and the second navigation signal component detection.

47. The apparatus of claim 46, wherein the at least one characteristic comprises at least one of a Carrier-to-Noise power ratio difference and a Doppler shift difference between the first navigation signal component detection and the second navigation signal component detection.

48. The apparatus of claim 45, wherein the processing means is adapted to classify the energy detection in based, at least in part, on a cross-correlation test of the first navigation signal component detection and the second navigation signal component detection.

49. The apparatus of claim 45, wherein the processing means is adapted to classify the energy detection based, at least in part, on an implementation of a jammer test on the first navigation signal component detection and the second navigation signal component detection.

50. An article comprising:

a storage medium comprising machine-readable instructions stored thereon which, if executed by a computing platform, are adapted to enable the computing platform to;

receive, by a first transmitter, a navigation signal component from a transmitter and to determine a first navigation signal component detection;

receive, by a second transmitter, the navigation signal component from the transmitter and to determine a second navigation signal component detection; and

classify an energy detection in the navigation signal component based at least in part on the first and second navigation signal component detections.

51. The article of claim 50, wherein the classifying the energy detection comprises classifying the energy detection in the navigation signal component as a false alarm in response to determining that the first navigation signal component detection is not correlated in at least one of Doppler and in code phase with the second navigation signal component detection.

52. The article of claim 50, wherein the classifying the energy detection comprises comparing at least one characteristic between the first navigation signal component detection and the second navigation signal component detection.

53. The article of claim 52, wherein the at least one characteristic comprises at least one of a Carrier-to-Noise power ratio difference and a Doppler shift difference between the first navigation signal component detection and the second navigation signal component detection.

54. The article of claim 50, wherein the machine-readable instructions are further adapted to implement a jammer test on the first navigation signal component detection and the second navigation signal component detection.