Wire event detection

• US 7,139,668 B2
• Filed: 10/30/2003
• Issued: 11/21/2006
• Est. Priority Date: 05/12/2003
• Status: Expired due to Fees

• Current Assignee: Simmonds Precision Products, Inc. (Raytheon Technologies Corporation d/b/a RTX)
• Original Assignee: Simmonds Precision Products, Inc. (Raytheon Technologies Corporation d/b/a RTX)
• Inventors: Bechhoefer, Eric Robert
• Primary Examiner(s): Hoff, Marc S.
• Assistant Examiner(s): Charioui, Mohamed
• Application Number:
  US10/696,810
• Publication Number:
  US 20040230387A1
• Time in Patent Office: 1,118 Days
• Field of Search: 702 57- 59, 702/66, 702/67, 702/69, 702/75, 702/106, 702/107, 702/117, 702/126, 702/183, 702/185, 324/528, 324/533, 324/534, 324/638, 370/242
• US Class Current: 702/58
• CPC Class Codes: G01R 31/008 on air- or spacecraft, railway rolling stock or sea-going vessels
• CPC Class Codes: G01R 31/088 Aspects of digital computing
• CPC Class Codes: G01R 31/11 using pulse reflection methods

Abstract

Classifying a portion of an electrical signal propagating through a conductor includes digitizing the electrical signal to provide a digitized signal, providing a plurality of stored digitized signals, wherein each stored digitized signal corresponds to a type of fault for the conductor, comparing the digitized signal to each of the stored digitized signals to determine a score therefore, if the score is less than a predetermined value for a particular one of the stored digitized signals, classifying the portion of the electrical signal as a fault corresponding to the particular one of the stored digitized signals, and, if none of the scores are less than the predetermined value, classifying the portion of the electrical signal as having no fault. Classifying a portion of an electrical signal may also include converting the digitized electrical signal to reflection coefficients.

Claims

1. A method of classifying a portion of an electrical signal propagating through a conductor, comprising:

digitizing the electrical signal to provide a digitized signal;

providing a plurality of stored digitized signals, wherein each stored digitized signal corresponds to a digitized electrical signal for one of a number of different possible types of faults for the conductor;

comparing the digitized signal to each of the stored digitized signals to determine a score therefore, wherein the score is a value determined in accordance with a level of similarity between the digitized signal and a particular one of the stored digitized signals;

if the score is less than a predetermined value for a particular one of the stored digitized signals, classifying the portion of the electrical signal as a fault corresponding to the particular one of the stored digitized signals; and

if none of the scores are less than the predetermined value, classifying the portion of the electrical signal as having no fault.

2. The method of claim 1, further comprising:

converting the digitized electrical signal to reflection coefficients.

3. The method of claim 2, wherein converting the digitized electrical signal includes dividing the values thereof by an input signal magnitude.

4. The method of claim 3, further comprising:

compensating the signal to remove unwanted reflective components caused by inverse scattering.

5. The method of claim 4, further comprising:

after compensating the signal to remove unwanted reflection components, performing attenuation compensation on the signal.

6. The method of claim 5, wherein attenuation compensation is a function of frequency and an amount of time the signal has traveled in the conductor.

7. The method of claim 5, wherein attenuation compensation is a function of frequency.

8. The method of claim 4, wherein said compensating the signal to remove unwanted reflective components utilizes a model including two coupled first-order partial differential equations.

9. The method of claim 1, wherein determining a score for a particular one of the stored digitized signals includes determining differences between the digitized signal and the particular one of the stored digitized signals at each point and summing the squares thereof.

10. The method of claim 9, further comprising:

adjusting the score based on one of;

the variance of the particular one of the stored digitized signals and the covariance of the particular one of the stored digitized signals.

11. The method of claim 1, wherein a lower score indicates a greater level of similarity between the digitized signal and a particular one of the stored digitized signals.

12. A computer program product that classifies a portion of an electrical signal propagating through a conductor, comprising:

executable code that digitizes the electrical signal to provide a digitized signal;

executable code that compares the digitized signal to each of a plurality of stored digitized signals that corresponds to a digitized electrical signal for one of a number of different possible types of faults for the conductor to determine a score therefore, wherein the score is a value determined in accordance with a level of similarity between the digitized signal and a particular one of the stored digitized signals;

executable code that classifies the portion of the electrical signal as a fault corresponding to the particular one of the stored digitized signals if the score is less than a predetermined value for a particular one of the stored digitized signals; and

executable code that classifies the portion of the electrical signal as having no fault if none of the scores are less than the predetermined value.

13. The computer program product of claim 12, further comprising:

executable code that converts the digitized electrical signal to reflection coefficients.

14. The computer program product of claim 13, wherein executable code that converts the digitized electrical signal includes executable code that divides the values thereof by an input signal magnitude.

15. The computer program product of claim 14, further comprising:

executable code that compensates the signal to remove unwanted reflective components caused by inverse scattering.

16. The computer program product of claim 15, further comprising:

executable code that performs attenuation compensation on the signal after compensating the signal to remove unwanted reflection components.

17. The computer program product of claim 16, wherein attenuation compensation is a function of frequency and an amount of time the signal has traveled in the conductor.

18. The computer program product of claim 16, wherein attenuation compensation is a function of frequency.

19. The computer program product of claim 15, wherein said executable code that compensates the signal to remove unwanted reflective components utilizes a model including two coupled first-order partial differential equations.

20. The computer program product of claim 12, executable code that determines a score for a particular one of the stored digitized signals includes executable code that determines differences between the digitized signal and the particular one of the stored digitized signals at each point and summing the squares thereof.

21. The computer program product of claim 20, further comprising:

executable code that adjusts the score based on one of;

the variance of the particular one of the stored digitized signals and the covariance of the particular one of the stored digitized signals.

22. The computer program product of claim 12, further comprising:

a memory that contains the plurality of stored digitized signals that correspond to types of faults for the conductor.

23. The computer program product of claim 12, wherein a lower score indicates a greater level of similarity between the digitized signal and a particular one of the stored digitized signals.

24. A method of classifying a portion of an electrical signal propagating through a conductor, comprising:

digitizing the electrical signal to provide a digitized signal;

providing a plurality of stored digitized signals, wherein each stored digitized signal corresponds to a digitized electrical signal for one of a number of different possible types of faults for the conductor;

comparing the digitized signal to each of the stored digitized signals to determine a score therefore, wherein the score is a value determined in accordance with a level of similarity between the digitized signal and a particular one of the stored digitized signals;

determining, in accordance with the score and a threshold indicating a type of fault corresponding to a particular one of the stored digitized signals, whether the portion of the electrical signal is classified as the type of fault corresponding to the particular one of the stored digitized signals; and

if none of the scores are determined as indicating a type of fault, classifying the portion of the electrical signal as having no fault.

25. A computer program product for classifying a portion of an electrical signal propagating through a conductor, comprising:

executable code that digitizes the electrical signal to provide a digitized signal;

providing a plurality of stored digitized signals, wherein each stored digitized signal corresponds to a digitized electrical signal for one of a number of different possible types of faults for the conductor;

executable code that compares the digitized signal to each of the stored digitized signals to determine a score therefore, wherein the score is a value determined in accordance with a level of similarity between the digitized signal and a particular one of the stored digitized signals;

executable code that determines, in accordance with the score and a threshold indicating a type of fault corresponding to a particular one of the stored digitized signals, whether the portion of the electrical signal is classified as the type of fault corresponding to the particular one of the stored digitized signals; and

executable code that classifies the portion of the electrical signal as having no fault if none of the scores are determined as indicating a type of fault.