GENERAL PURPOSE REMOVAL OF GEOMAGNETIC NOISE
First Claim
1. A magnetic sensor system, comprising:
- a plurality of magnetic field sensors arranged in an array, each magnetic field sensor configured to measure a magnetic field at the magnetic field sensor; and
a controller configured to receive magnetic field signals from each of the plurality of magnetic field sensors so as have an array of measured magnetic field values corresponding respectively to the magnetic field sensors,wherein the controller is configured to;
perform high pass time-domain filtering on the array of measured magnetic field values;
transform each of the measured magnetic field values to a common coordinate system to provide an array of transformed magnetic field values;
determine that a signal of interest exists in array elements of the array of transformed magnetic field values when the transformed magnetic field value deviates from spatially correlated noise by more than a predetermined threshold;
determine one or more regions of interest to be those array elements where the signal of interest exists, where for each region of interest the array elements where the signal of interest exists are adjacent to each other;
estimate a spatially correlated background noise based on the array of transformed magnetic field values; and
subtract the spatially correlated background noise from the transformed magnetic field values to provide noise removed magnetic field values.
1 Assignment
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Accused Products
Abstract
A magnetic sensor system, includes a plurality of magnetic field sensors and a controller. The plurality of magnetic field sensors are arranged in an array, each magnetic field sensor configured to measure a magnetic field at the magnetic field sensor. The controller is configured to receive magnetic field signals from each of the plurality of magnetic field sensors so as have an array of measured magnetic field values corresponding respectively to the magnetic field sensors. The controller is further configured to: transform each of the measured magnetic field values to a common coordinate system to provide an array of transformed magnetic field values; estimate a spatially correlated background noise based on the array of transformed magnetic field values; and subtract the spatially correlated background noise from the transformed magnetic field values to provide noise removed magnetic field values.
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Citations
45 Claims
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1. A magnetic sensor system, comprising:
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a plurality of magnetic field sensors arranged in an array, each magnetic field sensor configured to measure a magnetic field at the magnetic field sensor; and a controller configured to receive magnetic field signals from each of the plurality of magnetic field sensors so as have an array of measured magnetic field values corresponding respectively to the magnetic field sensors, wherein the controller is configured to; perform high pass time-domain filtering on the array of measured magnetic field values; transform each of the measured magnetic field values to a common coordinate system to provide an array of transformed magnetic field values; determine that a signal of interest exists in array elements of the array of transformed magnetic field values when the transformed magnetic field value deviates from spatially correlated noise by more than a predetermined threshold; determine one or more regions of interest to be those array elements where the signal of interest exists, where for each region of interest the array elements where the signal of interest exists are adjacent to each other; estimate a spatially correlated background noise based on the array of transformed magnetic field values; and subtract the spatially correlated background noise from the transformed magnetic field values to provide noise removed magnetic field values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A magnetic sensor system, comprising:
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a plurality of magnetic field sensors arranged in an array, each magnetic field sensor configured to measure a magnetic field at the magnetic field sensor; and a controller configured to receive magnetic field signals from each of the plurality of magnetic field sensors so as have an array of measured magnetic field values corresponding respectively to the magnetic field sensors, wherein the controller is configured to; transform each of the measured magnetic field values to a common coordinate system to provide an array of transformed magnetic field values; estimate a spatially correlated background noise based on the array of transformed magnetic field values; and subtract the spatially correlated background noise from the transformed magnetic field values to provide noise removed magnetic field values. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26)
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27. A magnetic sensor system, comprising:
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a plurality of magnetic field sensors arranged in an array, each magnetic field sensor configured to measure a magnetic field at the magnetic field sensor; and a controller configured to receive magnetic field signals from each of the plurality of magnetic field sensors so as have an array of measured magnetic field values corresponding respectively to the magnetic field sensors, wherein the controller is configured to transform each of the measured magnetic field values to a common coordinate system to provide an array of transformed magnetic field values. - View Dependent Claims (28, 29, 30, 31, 32, 33)
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34. A magnetic sensor system, comprising:
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a plurality of magnetic field sensors arranged in an array, each magnetic field sensor configured to measure a magnetic field at the magnetic field sensor; and a controller configured to receive magnetic field signals from each of the plurality of magnetic field sensors so as have an array of measured magnetic field values corresponding respectively to the magnetic field sensors, wherein the controller is configured to; determine that a signal of interest exists in array elements of the array of measured magnetic field values when the measured magnetic field value deviates from spatially correlated noise by more than a predetermined threshold; determine one or more regions of interest to be those array elements where the signal of interest exists, where for each region of interest the array elements where the signal of interest exists are adjacent to each other; estimate a spatially correlated background noise based on the array of measured magnetic field values; and subtract the spatially correlated background noise from the measured magnetic field values to provide noise removed magnetic field values. - View Dependent Claims (35, 36, 37, 38, 39, 40)
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41. A magnetic sensor system, comprising:
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a plurality of magnetic field sensors arranged in an array, each magnetic field sensor configured to measure a magnetic field at the magnetic field sensor; and a controlling unit for; receiving magnetic field signals from each of the plurality of magnetic field sensors so as have an array of measured magnetic field values corresponding respectively to the magnetic field sensors, performing high pass time-domain filtering on the array of measured magnetic field values; transforming each of the measured magnetic field values to a common coordinate system to provide an array of transformed magnetic field values; determining that a signal of interest exists in array elements of the array of transformed magnetic field values when the transformed magnetic field value deviates from spatially correlated noise by more than a predetermined threshold; determining one or more regions of interest to be those array elements where the signal of interest exists, where for each region of interest the array elements where the signal of interest exists are adjacent to each other; estimating a spatially correlated background noise based on the array of transformed magnetic field values; and subtracting the spatially correlated background noise from the transformed magnetic field values to provide noise removed magnetic field values.
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42. A method of operating a magnetic sensor system, the magnetic sensor system having a plurality of magnetic field sensors arranged in an array, each magnetic field sensor configured to measure a magnetic field at the magnetic field sensor, the method comprising:
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receiving magnetic field signals from each of the plurality of magnetic field sensors so as have an array of measured magnetic field values corresponding respectively to the magnetic field sensors; performing high pass time-domain filtering on the array of measured magnetic field values; transforming each of the measured magnetic field values to a common coordinate system to provide an array of transformed magnetic field values; determining that a signal of interest exists in array elements of the array of transformed magnetic field values when the transformed magnetic field value deviates from spatially correlated noise by more than a predetermined threshold; determining one or more regions of interest to be those array elements where the signal of interest exists, where for each region of interest the array elements where the signal of interest exists are adjacent to each other; estimating a spatially correlated background noise based on the array of transformed magnetic field values; and subtracting the spatially correlated background noise from the transformed magnetic field values to provide noise removed magnetic field values.
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43. A method of operating a magnetic sensor system, the magnetic sensor system having a plurality of magnetic field sensors arranged in an array, each magnetic field sensor configured to measure a magnetic field at the magnetic field sensor, the method comprising:
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receiving magnetic field signals from each of the plurality of magnetic field sensors so as have an array of measured magnetic field values corresponding respectively to the magnetic field sensors; transforming each of the measured magnetic field values to a common coordinate system to provide an array of transformed magnetic field values; estimating a spatially correlated background noise based on the array of transformed magnetic field values; and subtracting the spatially correlated background noise from the transformed magnetic field values to provide noise removed magnetic field values.
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44. A method of operating a magnetic sensor system, the magnetic sensor system having a plurality of magnetic field sensors arranged in an array, each magnetic field sensor configured to measure a magnetic field at the magnetic field sensor, the method comprising:
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receiving magnetic field signals from each of the plurality of magnetic field sensors so as have an array of measured magnetic field values corresponding respectively to the magnetic field sensors; and transforming each of the measured magnetic field values to a common coordinate system to provide an array of transformed magnetic field values.
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45. A method of operating a magnetic sensor system, the magnetic sensor system having a plurality of magnetic field sensors arranged in an array, each magnetic field sensor configured to measure a magnetic field at the magnetic field sensor, the method comprising:
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receiving magnetic field signals from each of the plurality of magnetic field sensors so as have an array of measured magnetic field values corresponding respectively to the magnetic field sensors; determining that a signal of interest exists in array elements of the array of measured magnetic field values when the measured magnetic field value deviates from spatially correlated noise by more than a predetermined threshold; determining one or more regions of interest to be those array elements where the signal of interest exists, where for each region of interest the array elements where the signal of interest exists are adjacent to each other; estimating a spatially correlated background noise based on the array of measured magnetic field values; and subtracting the spatially correlated background noise from the measured magnetic field values to provide noise removed magnetic field values.
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Specification