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公开(公告)号：US20240328824A1
公开(公告)日：2024-10-03
申请号：US18434835
申请日：2024-02-07
发明人： Zhi LI , Yasong GE , Lin ZHAO , Shuquan SUN , Xiao FENG
摘要： A pose calibration method for an aerospace magnetometer includes the following steps: mounting a magnetometer and a camera on a vehicle body; in the ground state, completely expanding a stretching rod mounted on the vehicle body, and taking photos from multiple angles by the camera in the Earth's full gravity mode; in the near-moon gravity mode, taking photos from multiple angles by the camera; comparing the photos in the Earth's full gravity mode and the near-moon gravity mode to obtain a reference database; and repeating S2 and S3 in an on-orbit state, and comparing the photographing result with the reference database to obtain a length and an angle of the stretching rod. According to the pose calibration method, the photographed structure in the on-orbit state is compared with the reference database to obtain the length and the angle of the stretching rod.
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2.发明授权公开(公告)号：US12098922B2
公开(公告)日：2024-09-24
申请号：US17600573
申请日：2020-04-03
申请人： THALES
CPC分类号： G01C21/165 , G01C25/00
摘要： An inertial reference unit includes a first measurement channel that includes a first high-performance inertial measurement unit for measuring specific forces and angular velocities, a first computing unit able to compute pure inertial data based on the measurements of the first measurement unit; a second measurement channel that includes a second inertial measurement unit of performance lower than the first inertial measurement unit for measuring specific forces and angular velocities; a second computing unit able to compute pure inertial data based on the measurements of the second measurement unit; an integrity check function able to implement a method for checking the integrity of the data of the first measurement channel based and the second measurement channel; and a synchronization device for synchronizing the measurements.
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公开(公告)号：US12085485B2
公开(公告)日：2024-09-10
申请号：US18573611
申请日：2022-05-23
CPC分类号： G01M7/025 , G01C25/005
摘要： A system and a method for analyzing the motions of a mechanical structure. The System includes (a) accelerometers provided as standard accelerometers to measurement-points of the mechanical structure, (b) at least three accelerometers provided as reference accelerometers to measurement-points of the mechanical structure, (c) at least one shaker being attached to the mechanical structure for moving the structure periodically within a first frequency range, and at least one data processing system being configured to: (d) receiving measurements from the accelerometers at the measurement-points when periodically moving the structure within the first frequency range by the at least one shaker. To provide accurate and quick calibration the at least one data processing system is further configured to calibrate the accelerometers' positions and orientations by the following steps: (e) determining from the measurements of the at least three reference accelerometers rigid body motions, (f) determining positions and orientations of reference accelerometers from the rigid body motions, and (g) determining positions and orientations of standard accelerometers from the rigid body motions.
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公开(公告)号：US12066301B1
公开(公告)日：2024-08-20
申请号：US17934797
申请日：2022-09-23
申请人： Samsara Inc.
发明人： Lucas Glenat , Eric Klaus Allseits , John Charles Bicket , Justin Pan , Glen Phillip McGillan , Kevin Lloyd
CPC分类号： G01C25/005 , G01C21/16
摘要： A device orientation calibration system to perform operations that include: accessing inertial measurement unit (IMU) data generated by an IMU mounted upon an object that corresponds with a first reference frame, the IMU data indicating a second reference frame that comprises a Z-axis, a Y-axis, and an X-axis; performing a calibration of the IMU data to align the second reference frame of the IMU with the first reference frame of the object, the performing the calibration comprising: determining a gravitational vector based on a first portion of the IMU data; applying a first rotation to the IMU data to align the Z-axis of the second reference frame with the gravitational vector; determining a forward motion vector based on a second portion of the IMU data; and applying a second rotation to the IMU data to align the X-axis of the second reference frame with the forward motion vector.
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5.发明授权公开(公告)号：US12044547B1
公开(公告)日：2024-07-23
申请号：US16298410
申请日：2019-03-11
CPC分类号： G01C25/00 , G01C17/00 , G01C21/005 , G01C21/08 , G01C21/16 , G01S5/00 , G01S19/47 , G06F3/011
摘要： In one embodiment, a technique for providing absolute orientation of a mobile device involves aligning the orientation sensor of the mobile device with the Earth's coordinate system. An initial orientation from the orientation sensor of the mobile device is accessed, a user is prompted to move the mobile device in a direction of the initial orientation, and using a position sensor, a set of position information that describes positions of the mobile device is captured while the mobile device is being moved in the direction. Based on the set of position information, a vector of movement is determined. Using the vector of movement, an orientation difference is calculated between the Earth's coordinate system and a coordinate system of the mobile device. Upon demand, an absolute orientation of the mobile device may be produced by accessing a live orientation from the orientation sensor and adding the orientation difference.
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公开(公告)号：US12038280B2
公开(公告)日：2024-07-16
申请号：US18363329
申请日：2023-08-01
申请人： NextNav, LLC
CPC分类号： G01C17/38 , G01C5/06 , G01C21/10 , G01C21/165 , G01C25/00 , G01C25/005 , G01S5/02 , G01S19/14 , G01S19/40
摘要： Calibrating a pressure sensor of a mobile device includes determining a first plurality of calibration values for a first plurality of visits to a first revisit zone to which a mobile device repeatedly returns; determining a first relative calibration adjustment value based on the first plurality of calibration values; determining an adjusted absolute calibration value based on i) an absolute calibration value used to calibrate pressure measurements made by a pressure sensor of the mobile device, and ii) the first relative calibration adjustment value; and calibrating pressure measurements made by the pressure sensor of the mobile device using the adjusted absolute calibration value.
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公开(公告)号：US20240230328A9
公开(公告)日：2024-07-11
申请号：US18049075
申请日：2022-10-24
发明人： Amir SAGHIR , Mingxing S. LI , Rakesh CHANDWANI , Edward AMOAH
摘要： A device may receive small cell data associated with a small cell, wherein the small cell data includes small cell location data and a small cell barometric pressure reading. The device may identify a calibration user device connected to the small cell and may receive, from the calibration user device, a user device barometric pressure reading. The device may calibrate, based on the user device barometric pressure reading, the small cell barometric pressure reading to obtain a calibrated small cell barometric pressure reading. The device may identify a reference weather station and may receive, from the reference weather station, weather station data, wherein the weather station data includes a weather station barometric pressure reading, and a weather station altitude that indicates an altitude of the reference weather station. The device may determine a small cell altitude based on the calibrated small cell barometric pressure reading and the weather station data.
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公开(公告)号：US20240230327A1
公开(公告)日：2024-07-11
申请号：US18403224
申请日：2024-01-03
申请人： MITUTOYO CORPORATION
发明人： Toshihisa TAKAI , Kentaro TAMURA , Yasushi UESHIMA
摘要： A non-contact probe includes: a light irradiating section that scans a measurement target object with spot-like laser beam; an image-capturing section that captures an image of the laser beam reflected by the measurement target object by using a plurality of pixel columns selected from a light-reception surface including a plurality of pixel columns, and generates a captured image; a position sensing section that senses an image-formation position of the laser beam on the captured image; and a pixel column changing section that selects a different plurality of pixel columns such that the image-formation position is included in the selected plurality of pixel columns.
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公开(公告)号：US20240210174A1
公开(公告)日：2024-06-27
申请号：US18393460
申请日：2023-12-21
申请人： Motion Engine Inc.
发明人： Robert Mark Boysel , Louis Ross
IPC分类号： G01C19/5712 , G01C19/5755 , G01C19/5769 , G01C25/00
CPC分类号： G01C19/5712 , G01C19/5755 , G01C19/5769 , G01C25/00
摘要： A MEMS motion sensor and its manufacturing method are provided. The sensor includes a MEMS wafer including a proof mass and flexible springs suspending the proof mass and enabling the proof mass to move relative to an outer frame along mutually orthogonal x, y and z axes. The sensor includes top and bottom cap wafers including top and bottom cap electrodes forming capacitors with the proof mass, the electrodes being configured to detect a motion of the proof mass. Electrical contacts are provided on the top cap wafer, some of which are connected to the respective top cap electrodes, while others are connected to the respective bottom cap electrodes by way of insulated conducting pathways, extending along the z axis from one of the respective bottom cap electrodes and upward successively through the bottom cap wafer, the outer frame of the MEMS wafer and the top cap wafer.
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公开(公告)号：US20240193814A1
公开(公告)日：2024-06-13
申请号：US18444938
申请日：2024-02-19
申请人： BNSF Railway Company
CPC分类号： G06T7/80 , G01C25/00 , G06T7/97 , G06T2207/30252
摘要： In one embodiment, a method includes capturing, by a camera of an image capturing module, a first image of a target. The image capturing module and a drum are attached to a fixture and the target is attached to the drum. The method also includes determining a number of lateral pixels in a lateral pitch distance of the image of the target, determining a lateral object pixel size based on the number of lateral pixels, and determining a drum encoder rate based on the lateral object pixel size. The drum encoder rate is programmed into a drum encoder. The method further includes capturing, by the camera, a second image of the target while the target is rotated about an axis of the drum, determining a number of longitudinal pixels in a longitudinal pitch distance of the second image, and comparing the number of lateral pixels to the number of longitudinal pixels.
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