Method and system for reducing interference
First Claim
1. A method for reducing effects of magnetic interference that may interfere with a magnetic field generated at or near an object with a device, comprising:
- (a) producing at least two different moving averages of a plurality of samples that are representative of a detected magnetic field signal strength, wherein each of the different moving averages is a moving average of a different number of the plurality of samples;
(b) determining a respective quality metric for each of the different moving averages;
(c) selecting one of the moving averages based on the determined quality metrics;
(d) reducing the effects of the magnetic interference based on the selected moving average; and
(e) determining the location of the object with the device based in part upon the selected moving average.
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Accused Products
Abstract
Method and systems for reducing effects of magnetic field interference that may interfere with a magnetic field signal generated at or near an underground object, where the magnetic field signal is used to monitor the location of the underground object. At least two different moving averages of a plurality of samples that are representative of a detected magnetic field signal strength are produce. Each of the different moving averages is a moving average of a different number of the plurality of samples. A respective quality metric (e.g., variance) is then determined for each of the different moving average. One of the moving averages is selected based on the determined quality metrics. Further signal processing is then performed using the selected moving average. For example, the selected moving average is used to monitor the location of the object.
60 Citations
20 Claims
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1. A method for reducing effects of magnetic interference that may interfere with a magnetic field generated at or near an object with a device, comprising:
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(a) producing at least two different moving averages of a plurality of samples that are representative of a detected magnetic field signal strength, wherein each of the different moving averages is a moving average of a different number of the plurality of samples;
(b) determining a respective quality metric for each of the different moving averages;
(c) selecting one of the moving averages based on the determined quality metrics;
(d) reducing the effects of the magnetic interference based on the selected moving average; and
(e) determining the location of the object with the device based in part upon the selected moving average. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A subsystem for use in a device that monitors the location of an underground object based on an magnetic field generated at or near the object, the subsystem for reducing effects of magnetic interference that may interfere with the magnetic field generated at or near the object, the subsystem comprising:
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means for producing at least two different moving averages of the plurality of samples that are representative of a detected magnetic field signal, wherein each of the different moving averages is a moving average of a different number of the plurality of samples;
means for determining a respective quality metric for each of the different moving averages;
means for selecting one of the moving averages based on the determined quality metrics;
means for reducing the effects of the magnetic interference in response to the selected moving average; and
means for determining the location of the object at least in part on the selected moving average. - View Dependent Claims (17, 18, 19, 20)
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Specification