Method for correcting a 3D location measured by a tracking system assuming a vertical offset
First Claim
1. A method of generating measurement data and position data from a survey, comprising:
- obtaining measurement data representing a measured physical property of a region from a survey tool, when the survey tool is positioned at various points on a surface of the region;
obtaining survey tool position data corresponding to each of the points on the surface of the region;
obtaining angular offset data, representing offset of orientation of the survey tool from a normal orientation, at each of the points on the surface of the region caused by variations in inclination of the surface; and
correcting the corresponding position data, based on the angular offset data.
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Accused Products
Abstract
Position measurements by a tracking system associated with a survey tool are corrected for tilt. The tracking station typically incorporates some offset from the surface across which a survey is conducted, and the offset will be subject to angular displacement as the tool tilts with respect to its normal orientation. The tracking system records the 3D position of the survey tool, with angular offset errors. In the disclosed examples, an inertial measurement unit (IMU), a dual axis inclinometer or a combination of two single axis inclinometers measures the amount of angular offset. The angular offset data is used to correct the position data, e.g. to reduce or eliminate errors caused by the angular offset, e.g. from vertical. If the tool provides measurement data, e.g. GPR readings, processing of the measurement data from the survey tool uses the corrected position data, e.g. to produce images of sub-surface features or objects.
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Citations
23 Claims
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1. A method of generating measurement data and position data from a survey, comprising:
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obtaining measurement data representing a measured physical property of a region from a survey tool, when the survey tool is positioned at various points on a surface of the region;
obtaining survey tool position data corresponding to each of the points on the surface of the region;
obtaining angular offset data, representing offset of orientation of the survey tool from a normal orientation, at each of the points on the surface of the region caused by variations in inclination of the surface; and
correcting the corresponding position data, based on the angular offset data. - View Dependent Claims (3, 4, 5, 6, 7, 8)
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2. The method of claim 2, further comprising processing the measurement data based on the corrected corresponding position data.
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9. A method of processing position data from a survey, comprising:
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obtaining position data corresponding to a point on a surface of a region to be surveyed at which a survey tool is positioned;
obtaining angular offset data, representing offset of orientation of the survey tool from a normal orientation, at the point on the surface of the region; and
correcting the corresponding position data, based on the angular offset data.
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10. A survey system, comprising:
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a survey tool;
a position detection device responsive to position of the survey tool, for generating survey tool position data corresponding to a point on a surface at which the survey tool is positioned;
an inclinometer coupled to the survey tool, for providing angular offset data in response to orientation of the survey tool, representing offset of orientation of the survey tool at the point from a normal orientation; and
a data processor for correcting the corresponding position data, based on the angular offset data. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A data processing system, comprising at least one programmable processor and programming executable by the at least one processor, wherein execution of the programming causes the at least one processor to implement functions comprising:
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receiving measurement data representing a measured physical property of a region from a survey tool, when the survey tool is positioned at various points on a surface of the region;
receiving survey tool position data corresponding to each of the points on the surface of the region;
receiving angular offset data, representing offset of orientation of the survey tool from a normal orientation, at each of the points on the surface of the region, caused by variations in inclination of the surface; and
correcting the corresponding position data, based on the angular offset data. - View Dependent Claims (21)
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22. A product comprising a machine-readable medium and programming comprising instructions executable by at least one programmable processor, wherein execution of the instructions causes the at least one processor to implement functions including:
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receiving measurement data representing a measured physical property of a region from a survey tool, when the survey tool is positioned at various points on a surface of the region;
receiving survey tool position data corresponding to each of the points on the surface of the region;
receiving angular offset data, representing offset of orientation of the survey tool from a normal orientation, at each of the points on the surface of the region, caused by variations in inclination of the surface; and
correcting the corresponding position data, based on the angular offset data. - View Dependent Claims (23)
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Specification