System and method for detecting a signal in a noisy environment
First Claim
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1. A method for identifying the occurrence of an event which produces an electromagnetic disturbance within a region of the earth, the method comprising the steps of:
- receiving signals appearing on a utility cable which extends through said region of the earth;
receiving environmental measurements from a device which detects electromagnetic signals in a given environment remote from said electromagnetic disturbance; and
analyzing said environmental measurements and said signals to detect the occurrence of the event.
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Abstract
A system and method are disclosed for detecting an event-related signal among noise, where the system includes memory for storing measurement values and may include a processor for generating residual values associated with the measurement values, and for detecting the event-related signal using the residual values.
41 Citations
60 Claims
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1. A method for identifying the occurrence of an event which produces an electromagnetic disturbance within a region of the earth, the method comprising the steps of:
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receiving signals appearing on a utility cable which extends through said region of the earth; receiving environmental measurements from a device which detects electromagnetic signals in a given environment remote from said electromagnetic disturbance; and analyzing said environmental measurements and said signals to detect the occurrence of the event. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for identifying the occurrence of an event which produces an electromagnetic disturbance within a region of the earth, the method comprising the steps of:
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measuring the electrical potential across a section of the earth to obtain a set of measured values, said section of the earth including the region of the earth in which the event produces the electromagnetic disturbance; detecting electromagnetic signals, in a given environment remote from said electromagnetic disturbance, to obtain a set of stored values; and analyzing said set of measured values and said set of stored values to detect the occurrence of the event. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A method for detecting an event-related signal comprising the steps of:
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generating residual values from a set of measurement values associated with an event-related signal; and determining a first condition of a first peak of an integral of squared power spectra of the residual values exceeding a first predetermined threshold to detect the event-related signal therefrom. - View Dependent Claims (20)
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21. An apparatus for identifying the occurrence of events which produce electromagnetic disturbances within a region of the earth, the apparatus comprising:
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means for receiving signals appearing on a utility cable which extends through said region of the earth; and means for receiving environmental measurements from a device which detects electromagnetic signals in an environment remote from said electromagnetic disturbance; means for analyzing said signals appearing on said utility cable and said measurements to detect the occurrence of the event. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. An apparatus for identifying the occurrence of an event which produces an electromagnetic disturbance within a region of the earth, the apparatus comprising:
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means for measuring the electrical potential across a section of the earth to obtain measured values, said section of the earth including the region of the earth in which the event produces the electromagnetic disturbance; means for detecting electromagnetic signals, in a given environment remote from said electromagnetic disturbance, to obtain a set of stored values; and means for analyzing said set of stored values and said set of measured values in such a way as to detect the occurrence of the event. - View Dependent Claims (33, 34, 35, 36, 37, 38)
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39. A system for identifying the occurrence of events which produce electromagnetic disturbances within a region of the earth, the system comprising:
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a receiver for receiving signals appearing on a utility cable which extends through said region of the earth; a detector for receiving environmental measurements from a device which detects electromagnetic signals in an environment remote from said electromagnetic disturbance; and a processor for analyzing said signals appearing on said utility cable and said environmental measurements to detect the occurrence of the events. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46)
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47. A system for identifying the occurrence of an event which produces an electromagnetic disturbance within a region of the earth, the system comprising:
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means for measuring the electrical potential across a section of the earth to obtain measured values, said section of the earth including the region of the earth in which the event produces the electromagnetic disturbance; means for detecting electromagnetic signals, in a given environment remote from said electromagnetic disturbance, to obtain a set of stored values; and means for analyzing said set of stored values and said set of measured values to detect the occurrence of the event. - View Dependent Claims (48, 49, 50, 51, 52, 53)
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54. A system for detecting an event-related signal comprising:
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memory for storing measurement values; and means for generating residual values associated with the measurement values, and for detecting the event-related signal using the residual values, said means being responsive to a signal detection program for determining a condition of a first peak of an integral of squared power spectra of the residual values exceeding a predetermined threshold to detect the event-related signal therefrom. - View Dependent Claims (55)
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56. A system for detecting an event-related electromagnetic signal associated with a tsunami comprising:
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a detector for detecting and measuring a plurality of electromagnetic signals, including the event-related electromagnetic signal, to obtain a plurality of measurement values over an interval of time; and a processing unit including; memory and stored programs, including a signal detection program, for receiving and storing the plurality of measurement values; and a processor responsive to the signal detection program for generating residual values associated with the plurality of measurement values, and for detecting the event-related electromagnetic signal among the plurality or electromagnetic signals using the residual values, said processor being responsive to the signal detection program for detecting a condition for each of a plurality of peaks of an integral of squared power spectra of the residual values exceeding a first predetermined threshold to detect the event-related electromagnetic signal therefrom as associated with a set of peaks exceeding a first predetermined threshold. - View Dependent Claims (57)
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58. A method for detecting an event-related signal that propagates in an environment between a detector equipment location and a remote location, the method comprising the steps of:
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detecting electromagnetic signals propagating in the environment of the detector equipment location to store said environmental measurements over a period of time; determining a set of expected values based on said environmental measurements, said expected values being a prediction of a difference in electrical potential, across a section of the earth between the detector equipment location and the remote location; measuring the electrical potential across the section of the earth between the detector equipment location and the remote location to determine measured values of the difference in electrical potential therebetween; generating a set of residual values based on said set of expected values and said set of measured values; and analyzing said set of residual values to detect the event-related signal.
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59. An apparatus for detecting an event-related signal propagating in an environment between the location of the apparatus and a remote location, the apparatus comprising:
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a detector for measuring electromagnetic signals propagating in the environment of the location of the apparatus; a processor operable to determine, based on said measured electromagnetic signals, a set of expected values of the electrical potential across a section of the earth between said location of the apparatus and the remote location; and a detector for measuring the electrical potential across said surface of the earth between the location of the apparatus and the remote location; and said processor being further operable to determine a set of residual values based on said electrical potential measurements and said set of expected values, analyze said set of residual values to detect the event-related signal.
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60. A system for detecting an event-related signal that propagates in an environment between a detector equipment location and a remote location, the system comprising:
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means for detecting, over a period of time, electromagnetic signals propagating in the environment of the detector equipment location; means for storing measurements of said detected electromagnetic signals in a memory; means for determining a set of expected values based on said environmental measurements, said expected values being a prediction of a difference in electrical potential across a section of the earth, between the detector equipment location and the remote location; means for measuring the electrical potential across the section of the earth between the detector equipment location and the remote location during a period of time wherein the event-related signal propagates therebetween; means for generating a set of residual values based on said set of expected values and said set of measured values; and means for analyzing said set of residual values to detect the presence of the event-related signal.
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Specification