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公开(公告)号：US20230349723A1
公开(公告)日：2023-11-02
申请号：US18194903
申请日：2023-04-03
IPC分类号： G01C25/00 , G01C17/38 , E21B47/022 , G01R35/00
CPC分类号： G01C25/005 , G01C17/38 , E21B47/022 , G01R35/005
摘要： An improved total field calibration system and method is disclosed for reducing the rotational misalignment between magnetic and gravity sensors in a directional sensing system. A method of calibrating a tri-axial directional sensor comprising orthonormal accelerometers and orthonormal magnetometers, comprises measuring Earth's magnetic and gravity fields with said directional sensor in at least 4 sensor orientations; obtaining at least one reference field value of dip drift of Earth's magnetic field from at least one source independent of said directional sensor corresponding to said orientations; and, determining and applying rotational misalignments between said magnetometers and said accelerometers so that measured magnetic dip drifts are substantially equal to said reference values. The calibration process can be performed without monitoring the declination change during the calibration process. Directional sensing systems can be calibrated accurately during a period when the Earth's magnetic field changes rapidly.
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公开(公告)号：US20210262827A1
公开(公告)日：2021-08-26
申请号：US17121032
申请日：2020-12-14
IPC分类号： G01C25/00 , G01R35/00 , G01C17/38 , E21B47/022
摘要： An improved total field calibration system and method is disclosed for reducing the rotational misalignment between magnetic and gravity sensors in a directional sensing system. A method of calibrating a tri-axial directional sensor comprising orthonormal accelerometers and orthonormal magnetometers, comprises measuring Earth's magnetic and gravity fields with said directional sensor in at least 4 sensor orientations; obtaining at least one reference field value of dip drift of Earth's magnetic field from at least one source independent of said directional sensor corresponding to said orientations; and, determining and applying rotational misalignments between said magnetometers and said accelerometers so that measured magnetic dip drifts are substantially equal to said reference values. The calibration process can be performed without monitoring the declination change during the calibration process. Directional sensing systems can be calibrated accurately during a period when the Earth's magnetic field changes rapidly.
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公开(公告)号：US20150168176A1
公开(公告)日：2015-06-18
申请号：US14572569
申请日：2014-12-16
CPC分类号： G01C25/005 , E21B47/022 , G01C17/38 , G01R35/005
摘要： An improved total field calibration system and method is disclosed for reducing the rotational misalignment between magnetic and gravity sensors in a directional sensing system. The effect of variation of surface components of the Earth's magnetic field during the calibration process on magnetometer misalignment may be completely eliminated by requiring the magnetic dip derived from the sensing system to match that of the Earth's field obtained from a reference source. The calibration process can be performed without monitoring the declination change during the calibration process. Directional sensing systems can be calibrated accurately during a period when the Earth's magnetic field changes rapidly.
摘要翻译： 公开了一种改进的总场校准系统和方法，用于减少方向感测系统中磁重力传感器与重力传感器之间的旋转失准。 校准过程中地球磁场的表面分量变化对磁力计失准的影响可以通过要求来自感测系统的磁倾角与从参考源获得的地球场的磁场倾斜相一致而完全消除。 校准过程可以在不监测校正过程中的偏角变化的情况下执行。 在地球磁场迅速变化的时期，可以精确地校准定向传感系统。
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公开(公告)号：US11619518B2
公开(公告)日：2023-04-04
申请号：US17121032
申请日：2020-12-14
IPC分类号： G01C25/00 , G01R35/00 , G01C17/38 , E21B47/022
摘要： An improved total field calibration system and method is disclosed for reducing the rotational misalignment between magnetic and gravity sensors in a directional sensing system. A method of calibrating a tri-axial directional sensor comprising orthonormal accelerometers and orthonormal magnetometers, comprises measuring Earth's magnetic and gravity fields with said directional sensor in at least 4 sensor orientations; obtaining at least one reference field value of dip drift of Earth's magnetic field from at least one source independent of said directional sensor corresponding to said orientations; and, determining and applying rotational misalignments between said magnetometers and said accelerometers so that measured magnetic dip drifts are substantially equal to said reference values. The calibration process can be performed without monitoring the declination change during the calibration process. Directional sensing systems can be calibrated accurately during a period when the Earth's magnetic field changes rapidly.
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公开(公告)号：US20160123765A1
公开(公告)日：2016-05-05
申请号：US14991726
申请日：2016-01-08
IPC分类号： G01C25/00
CPC分类号： G01C25/005 , E21B47/022 , G01C17/38 , G01R35/005
摘要： An improved total field calibration system and method is disclosed for reducing the rotational misalignment between magnetic and gravity sensors in a directional sensing system. A method of calibrating a tri-axial directional sensor comprising orthonormal accelerometers and orthonormal magnetometers, comprises measuring Earth's magnetic and gravity fields with said directional sensor in at least 4 sensor orientations; obtaining at least one reference field value of dip drift of Earth's magnetic field from at least one source independent of said directional sensor corresponding to said orientations; and, determining and applying rotational misalignments between said magnetometers and said accelerometers so that measured magnetic dip drifts are substantially equal to said reference values. The calibration process can be performed without monitoring the declination change during the calibration process. Directional sensing systems can be calibrated accurately during a period when the Earth's magnetic field changes rapidly.
摘要翻译： 公开了一种改进的总场校准系统和方法，用于减少方向感测系统中磁重力传感器与重力传感器之间的旋转失准。 一种校准包括正交加速度计和正交磁力计的三轴方向传感器的方法，包括以至少4个传感器方向用所述方向传感器测量地球的磁场和重力场; 从独立于所述方向传感器的至少一个源获得对应于所述取向的地球磁场的倾角漂移的至少一个参考场值; 以及确定并施加所述磁力计与所述加速度计之间的旋转不对准，使得所测量的磁倾角漂移基本上等于所述参考值。 校准过程可以在不监测校正过程中的偏角变化的情况下执行。 在地球磁场迅速变化的时期，可以精确地校准定向传感系统。
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公开(公告)号：US20180143036A1
公开(公告)日：2018-05-24
申请号：US15862198
申请日：2018-01-04
IPC分类号： G01C25/00 , G01C17/38 , G01R35/00 , E21B47/022
CPC分类号： G01C25/005 , E21B47/022 , G01C17/38 , G01R35/005
摘要： An improved total field calibration system and method is disclosed for reducing the rotational misalignment between magnetic and gravity sensors in a directional sensing system. A method of calibrating a tri-axial directional sensor comprising orthonormal accelerometers and orthonormal magnetometers, comprises measuring Earth's magnetic and gravity fields with said directional sensor in at least 4 sensor orientations; obtaining at least one reference field value of dip drift of Earth's magnetic field from at least one source independent of said directional sensor corresponding to said orientations; and, determining and applying rotational misalignments between said magnetometers and said accelerometers so that measured magnetic dip drifts are substantially equal to said reference values. The calibration process can be performed without monitoring the declination change during the calibration process. Directional sensing systems can be calibrated accurately during a period when the Earth's magnetic field changes rapidly.
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公开(公告)号：US09863785B2
公开(公告)日：2018-01-09
申请号：US14991726
申请日：2016-01-08
IPC分类号： G01C25/00 , G01R35/00 , G01P21/00 , E21B47/022 , G01C17/38
CPC分类号： G01C25/005 , E21B47/022 , G01C17/38 , G01R35/005
摘要： An improved total field calibration system and method is disclosed for reducing the rotational misalignment between magnetic and gravity sensors in a directional sensing system. A method of calibrating a tri-axial directional sensor that includes orthonormal accelerometers and orthonormal magnetometers is disclosed. The method includes measuring Earth's magnetic and gravity fields with said directional sensor in at least 4 sensor orientations; obtaining at least one reference field value of dip drift of Earth's magnetic field from at least one source independent of said directional sensor corresponding to said orientations; and, determining and applying rotational misalignments between said magnetometers and said accelerometers so that measured magnetic dip drifts are substantially equal to said reference values. The calibration process can be performed without monitoring the declination change during the calibration process. Directional sensing systems can be calibrated accurately during a period when the Earth's magnetic field changes rapidly.
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公开(公告)号：US09250100B2
公开(公告)日：2016-02-02
申请号：US14572569
申请日：2014-12-16
IPC分类号： G01C25/00 , G01R35/00 , G01P21/00 , E21B47/022
CPC分类号： G01C25/005 , E21B47/022 , G01C17/38 , G01R35/005
摘要： An improved total field calibration system and method is disclosed for reducing the rotational misalignment between magnetic and gravity sensors in a directional sensing system. The effect of variation of surface components of the Earth's magnetic field during the calibration process on magnetometer misalignment may be completely eliminated by requiring the magnetic dip derived from the sensing system to match that of the Earth's field obtained from a reference source. The calibration process can be performed without monitoring the declination change during the calibration process. Directional sensing systems can be calibrated accurately during a period when the Earth's magnetic field changes rapidly.
摘要翻译： 公开了一种改进的总场校准系统和方法，用于减少方向感测系统中磁重力传感器与重力传感器之间的旋转失准。 校准过程中地球磁场的表面分量变化对磁力计失准的影响可以通过要求来自感测系统的磁倾角与从参考源获得的地球场的磁场倾斜相一致而完全消除。 校准过程可以在不监测校正过程中的偏角变化的情况下执行。 在地球磁场迅速变化的时期，可以精确地校准定向传感系统。
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