Error Indicator, Preventor, Or Compensator Patents (Class 33/356)
  • Patent number: 10648808
    Abstract: Optoelectronic measuring device having an electronic magnetic compass and a compensation device assigned to the magnetic compass for compensating device-fixed interference fields and is designed to occupy at least two defined, repeatable operating states and generates a different device-fixed interference field in each of the operating states. The measuring device is designed to occupy at least two defined, repeatable application states, the magnetic compass being exposed to a different external magnetic interference field in each of the application states. The compensation device being designed to measure a first, second and third magnetic field set in a first, second and third overall state of the measuring device, and to determine by means of the processing unit a first, second and third set of parameters based on the first, second and third magnetic field set respectively, and to derive a fourth parameter set based on the first, second and third parameter set.
    Type: Grant
    Filed: February 26, 2018
    Date of Patent: May 12, 2020
    Assignee: Safran Vectronix AG
    Inventor: Silvio Gnepf
  • Patent number: 10591627
    Abstract: Proximity detection systems and proximity detections methods are disclosed herein. In one aspect of the disclosure the systems and methods include measuring and analyzing the vector components of a generated magnetic field. In another aspect of the present disclosure, the results of the vector component measurements are used to take safety actions which may result in an alert to an operator or pedestrian, and/or automatic action by a vehicle or machine.
    Type: Grant
    Filed: August 23, 2017
    Date of Patent: March 17, 2020
    Assignee: FREDERICK ENERGY PRODUCTS, LLC
    Inventors: Larry D. Frederick, Dean Estill, Andrew Nichols
  • Patent number: 10509476
    Abstract: Techniques described herein may allow for an enhanced authentication of a user of a user device, such as a mobile telephone. Some such techniques may be applicable when transitioning the user device from a locked state to an unlocked state. The user device may determine an orientation associated with the user device (e.g., a magnetic declination, which may be expressed in terms of degrees from north), and may output the direction to an authentication server. The authentication server may determine whether the orientation matches a previously stored orientation, and may indicate to the user device whether the user device should activate a public mode or a private mode. The authentication server may also notify one or more application servers regarding the mode of the user device. In private mode, the presenting, sending, or receiving of certain types of data (e.g., sensitive data) may be restricted.
    Type: Grant
    Filed: July 2, 2015
    Date of Patent: December 17, 2019
    Assignee: Verizon Patent and Licensing Inc.
    Inventors: Viraj C. Mantri, Shivaramakrishna Nyshadham, Prateek Mehrotra, Vishal Bhasin
  • Patent number: 10361610
    Abstract: An encoder which detects information on the position or the speed of a motor includes memory which stores motor-specific information on the motor to be mounted on the encoder, a mount determination unit which determines whether the encoder has been removed from the motor, and a memory information erasure unit which erases the motor-specific information stored in the memory when the mount determination unit determines that the encoder has been removed from the motor.
    Type: Grant
    Filed: July 31, 2017
    Date of Patent: July 23, 2019
    Assignee: FANUC CORPORATION
    Inventor: Hidetoshi Uematsu
  • Patent number: 10337884
    Abstract: A method and apparatus for fast magnetometer calibration with little space coverage is described herein. The present method and apparatus is capable of performing both 2-dimensional (2D) and 3-dimensional (3D) calibration for a magnetometer (magnetic sensor) and calculating calibration parameters. The present method and apparatus does not need the user to be involved in the calibration process and there are no required specific movements that the user should perform. The present method and apparatus performs magnetometer calibration in 2D or 3D depending on the natural device movements whatever the application that the magnetometer is used in.
    Type: Grant
    Filed: March 5, 2014
    Date of Patent: July 2, 2019
    Assignee: InvenSense, Inc.
    Inventors: Ahmed Wahdan, Jacques Georgy, Walid Abdelfatah, Aboelmagd Noureldin
  • Patent number: 10330746
    Abstract: A system, method, and magnetic field sensor. The magnetic field sensor includes a strain gauge. The magnetic field sensor further includes one or more magnetostrictive layers disposed upon the strain gauge. The magnetostrictive layers are configured to cause a displacement of the strain gauge in response to sensing a magnetic field. The magnetic field sensor further includes logic connected to the strain gauge configured to determine a parameter of the magnetic field in response to sensing the magnetic field.
    Type: Grant
    Filed: December 31, 2013
    Date of Patent: June 25, 2019
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Li Gao, David L. Perkins, Michael T. Pelletier
  • Patent number: 10267649
    Abstract: A method and an apparatus for calculating azimuth, and a method and an apparatus for determining an offset from geomagnetic field are provided. An apparatus for calculating azimuth includes a magnetic sensor configured to sense magnetic field, a data selecting unit configured to select offset data items, an offset calculating unit configured to calculate an offset by a geometrical method that uses the selected offset data items, and an azimuth calculating unit configured to calculate an azimuth by using the calculated offset.
    Type: Grant
    Filed: April 2, 2014
    Date of Patent: April 23, 2019
    Assignee: MagnaChip Semiconductor, Ltd.
    Inventors: Dong Ho Kim, Ki Seok Cho
  • Patent number: 10215564
    Abstract: Techniques are disclosed for systems and methods to provide automatic and substantially continuous calibration for compasses mounted to moving structures. A compass calibration system may include a logic device configured to receive one or more sensor signals and determine a corrected magnetic field based, at least in part, on a measured local magnetic field. The logic device may be adapted to receive an angular velocity, an acceleration, the measured local magnetic field, and/or a speed of a mobile structure; generate stabilized roll and pitch components of an orientation of the mobile structure based, at least in part, on the acceleration and angular velocity; and determine the corrected magnetic field based, at least in part, on the speed, the local magnetic field, the stabilized roll and pitch components, and/or the angular velocity.
    Type: Grant
    Filed: November 13, 2015
    Date of Patent: February 26, 2019
    Assignee: FLIR SYSTEMS, INC.
    Inventors: Mark Johnson, Warwick Mills, Chris Yeomans
  • Patent number: 10209078
    Abstract: A system, a method and a computer program product are provided for local perturbation immunity in a vector-based sensing device. Measurement data from at least one vector-based sensing device is evaluated at a given time using a heuristic to identify an occurrence of a perturbing event, wherein the at least one vector-based sensing device includes either a magnetometer or an accelerometer, or both the magnetometer and the accelerometer. A time-shifting component is provided to reject the perturbing event for a duration of the perturbing event and use measurement data from a gyroscope to construct vector-based sensing device measurement data unaffected by the perturbing event.
    Type: Grant
    Filed: August 31, 2017
    Date of Patent: February 19, 2019
    Assignee: Yost Labs Inc.
    Inventor: Paul Yost
  • Patent number: 10209069
    Abstract: An offset calculation circuit comprising a data obtaining unit for sequentially obtaining two-axis or three-axis magnetic detection data as a set of data points of a two-axis coordinate system or a three-axis coordinate system; an offset recording unit for recording offset components of the magnetic detection data as an offset point of the two-axis coordinate system or the three-axis coordinate system; and an offset calculation unit for calculating a first reference line or a first reference plane put between first and second data points among the set of data points, and subsequently moving the offset point recorded in the offset recording unit in a direction toward the first reference line or the first reference plane to calculate a first offset candidate point.
    Type: Grant
    Filed: December 8, 2015
    Date of Patent: February 19, 2019
    Assignee: Rohm Co., Ltd.
    Inventor: Koji Saito
  • Patent number: 10183696
    Abstract: Methods and systems are provided for controlling a steering system of a vehicle is provided. A detection unit is configured to obtain a compass heading, a global positioning system (GPS) heading, or both. A processor is coupled to the detection unit, and is configured to determine whether a vehicle is on a straight line path using the compass heading, the GPS heading, or both, and to selectively implement a feature of the steering system based on whether it is determined that the vehicle is not on a straight line path.
    Type: Grant
    Filed: September 3, 2015
    Date of Patent: January 22, 2019
    Assignee: GM Global Technology Operations LLC
    Inventors: Kenneth L. Oblizajek, Stephen R. Pastor, David M. Caldwell, John D. Sopoci
  • Patent number: 10183650
    Abstract: A method for assessing a reliability of a determination of the relative position between a device for accessing a vehicle and the vehicle including transmitting a first radio signal from a first antenna of the vehicle; transmitting a second radio signal from a second antenna of the vehicle; receiving the first radio signal at the device and determining a first signal intensity; receiving the second radio signal at the device and determining a second signal intensity; determining, at the device or the vehicle, a relative position of the device and/or the vehicle and/or signal directions from which the radio signals have arrived at the device, based on the first signal intensity and the second signal intensity; determining a compatibility of the determined relative position and/or the signal directions with an arrangement of the first antenna and the second antenna at the vehicle to assess the reliability of relative position determination.
    Type: Grant
    Filed: May 8, 2017
    Date of Patent: January 22, 2019
    Assignee: VOLKSWAGEN AG
    Inventors: Julian Verkin, Patrick Sammer, Karsten Beyer
  • Patent number: 10175043
    Abstract: Techniques are disclosed for systems and methods to provide automatic and substantially continuous calibration for compasses mounted to moving structures. A compass calibration system may include a logic device configured to receive one or more sensor signals and determine a corrected magnetic field based, at least in part, on a measured local magnetic field. The logic device may be configured to receive the measured local magnetic field comprising a series of magnetic measurements associated with a mobile structure; determine a valid portion of a toroidal shape of the series of magnetic measurements that is available for further processing; and determine the corrected magnetic field based, at least in part, on calibration parameters derived from at least the valid portion of the toroidal shape.
    Type: Grant
    Filed: December 28, 2016
    Date of Patent: January 8, 2019
    Assignee: FLIR Belgium BVBA
    Inventors: Mark Johnson, Christopher Yeomans
  • Patent number: 10082393
    Abstract: Systems and methods of calibrating and adjusting for deviations in a vehicle's heading system, such as the attitude heading and reference system of an aircraft or the heading system of a ship, positioned along the Earth's surface involve calibrating magnetometers for hard iron and misalignment errors using single heading measurements. This can be accomplished by obtaining both actual and theoretical readings for the magnetometer of the heading system, and comparing these values to obtain calibration values for the heading system. The vehicle may be repositioned, such as to North, South, East, and west magnetic headings, with the procedure repeated at each of these headings, and the calibration values averaged, further increasing the accuracy.
    Type: Grant
    Filed: February 22, 2018
    Date of Patent: September 25, 2018
    Assignee: Innovative Solutions & Support, Inc.
    Inventor: Shahram Askarpour
  • Patent number: 9964661
    Abstract: A determination device includes a geomagnetism value obtaining unit for obtaining a geomagnetism value detected with a geomagnetism sensor; and a geomagnetism value determining unit for determining a type of moving object among a plurality of types of moving objects according to the geomagnetism value obtained with the geomagnetism value obtaining unit.
    Type: Grant
    Filed: July 31, 2015
    Date of Patent: May 8, 2018
    Assignee: LAPIS SEMICONDUCTOR CO., LTD.
    Inventor: Kazunori Fujiwara
  • Patent number: 9921063
    Abstract: Systems and methods of calibrating and adjusting for deviations in a vehicle's heading system, such as the attitude heading and reference system of an aircraft or the heading system of a ship, positioned along the Earth's surface involve calibrating magnetometers for hard iron and misalignment errors using single heading measurements. This can be accomplished by obtaining both actual and theoretical readings for the magnetometer of the heading system, and comparing these values to obtain calibration values for the heading system. The vehicle may be repositioned, such as to North, South, East, and west magnetic headings, with the procedure repeated at each of these headings, and the calibration values averaged, further increasing the accuracy.
    Type: Grant
    Filed: September 28, 2016
    Date of Patent: March 20, 2018
    Assignee: INNOVATIVE SOLUTIONS & SUPPORT, INC.
    Inventor: Shahram Askarpour
  • Patent number: 9903908
    Abstract: A nonlinear distortion detection device that includes a test signal generator that generates a test signal and outputs the test signal to have the power amplifier amplify the test signal, a Fourier transformer that converts an output signal of the power amplifier to a signal in a frequency domain, and a distortion factor calculator that calculates a distortion factor of the power amplifier based on amplitude information and phase information of the signal in the frequency domain.
    Type: Grant
    Filed: February 16, 2015
    Date of Patent: February 27, 2018
    Assignee: PANASONIC CORPORATION
    Inventors: Kenji Miyanaga, Noriaki Saito
  • Patent number: 9861445
    Abstract: The present invention refers to a portable device for identification of surgical items with magnetic markers, method for identifying surgical objects with magnetic markers and system for the prevention of retention of surgical items with magnetic markers. The present invention can be used in surgical centers, with the aim of detecting surgical elements/objects (5) retained in the patient after surgery. The present invention aims to provide instrumental support in object location surgical (5) retained inside the body cavities for detecting artifacts forgotten after a surgical procedure, by means of device and specific objects and method and system for their identification.
    Type: Grant
    Filed: February 27, 2014
    Date of Patent: January 9, 2018
    Assignee: INSTITUTO TECHNÓLOGICO DE AERONÁUTICA—ITA
    Inventors: Osamu Saotome, Rogério Dos Santos Vagner, Carlos Fonseca Pereira Evaldo, José Elias Matieli
  • Patent number: 9816814
    Abstract: In one example a magnetometer unit comprises logic, to receive first magnetic response data from a first magnetic sensor and second magnetic response data from a second magnetic sensor displaced from the first magnetic sensor, generate a composite response surface representation from the first magnetic response data and the second magnetic response data, and store the composite response surface representation in a non-transitory memory. Other examples may be described.
    Type: Grant
    Filed: June 25, 2014
    Date of Patent: November 14, 2017
    Assignee: Intel Corporation
    Inventors: Kevin J. Daniel, Gary A. Brist
  • Patent number: 9760186
    Abstract: An electronic device utilizing a nine-axis motion sensor module, capable of accurately outputting a resultant deviation including deviation angles in a 3D reference frame is provided. The present invention provides a novel comparison and compensation to accurately obtain a resultant deviation including deviation angles of the electronic device under the presence of external and/or internal interferences including the ones caused by undesirable electromagnetic fields and the ones associated with undesirable external forces and axial accelerations.
    Type: Grant
    Filed: March 28, 2011
    Date of Patent: September 12, 2017
    Assignee: CM HK LIMITED
    Inventors: Zhou Ye, Chin-Lung Li, Shun-Nan Liou
  • Patent number: 9733083
    Abstract: A method configured to operate an electronic device is provided. The method includes first sensing information of a geomagnetic sensor and second sensing information of at least one motion sensor. Designated attributes of the first sensing information and the second sensing information are compared. When the geomagnetic sensor is determined as a specific state depending on the comparison result, performance of a designated internal device is controlled.
    Type: Grant
    Filed: February 12, 2015
    Date of Patent: August 15, 2017
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Dae-Kwang Kim
  • Patent number: 9526958
    Abstract: The present invention extends to a digital compass ball marker that can be used to provide timely information to assist the golfer in determining a direction and force for a golf shot on a green. The digital compass ball marker can output this information using minimal information input by the golfer so that the use of the ball marker does not slow play, and in many cases, can speed play. The information provided by the ball marker can include a force with which to hit the shot and a direction to aim.
    Type: Grant
    Filed: November 11, 2014
    Date of Patent: December 27, 2016
    Inventor: Jack W. Peterson
  • Patent number: 9506754
    Abstract: A parameter related to the Earth's magnetic field can be used to determine accuracy of a magnetometer of a mobile device. In one aspect, a first instance of a parameter related to Earth's magnetic field is determined using data generated by the magnetometer. The magnetometer data can be based in part on a position of the mobile device with respect to the Earth. A second instance of the parameter can be determined using data generated by a model of Earth's magnetic field. The model data can also be based in part on the position of the mobile device with respect to the Earth. The first instance of the parameter can be compared with the second instance of the parameter. An accuracy metric for the magnetometer can be determined based on a result of the comparison. An indication of the accuracy metric can be presented by the mobile device.
    Type: Grant
    Filed: March 25, 2014
    Date of Patent: November 29, 2016
    Assignee: Apple Inc.
    Inventors: Robert Mayor, Patrick Piemonte, Ronald Keryuan Huang, Parin Patel
  • Patent number: 9506755
    Abstract: Apparatus and methods to compensate hard iron and soft iron magnetic interference in magnetic sensing devices are described. Hard and soft iron interference may be modeled using an ellipsoidal surface generated by a plurality of magnetic field measurements. A displacement of the ellipsoid from a reference frame origin corresponds to hard iron or permanent magnetic field interference. A shape and orientation of the ellipsoid corresponds to soft iron magnetic field interference. The ellipsoidal surface may be analyzed to obtain magnetic field compensation values for cancelling hard iron and soft iron interference.
    Type: Grant
    Filed: June 18, 2014
    Date of Patent: November 29, 2016
    Inventors: Travis Tu, Shu Fang
  • Patent number: 9476734
    Abstract: Systems and methods of calibrating and adjusting for deviations in a vehicle's heading system, such as the attitude heading and reference system of an aircraft or the heading system of a ship, positioned along the Earth's surface involve calibrating magnetometers for hard iron and misalignment errors using single heading measurements. This can be accomplished by obtaining both actual and theoretical readings for the magnetometer of the heading system, and comparing these values to obtain calibration values for the heading system. The vehicle may be repositioned, such as to North, South, East, and west magnetic headings, with the procedure repeated at each of these headings, and the calibration values averaged, further increasing the accuracy.
    Type: Grant
    Filed: March 3, 2016
    Date of Patent: October 25, 2016
    Assignee: Innovative Solutions and Support, Inc.
    Inventor: Shahram Askarpour
  • Patent number: 9470550
    Abstract: A method of calibrating a vehicle's heading system, such as the attitude heading and reference system of an aircraft or the heading system of a ship, positioned along the Earth's surface involves obtaining both actual and theoretical readings for the magnetometer of the heading system, and comparing these values to obtain calibration values for the heading system which are then averaged to obtain a universal average gain and offset for the magnetometer. The vehicle may be repositioned, such as to North, South, East, and west magnetic headings, with the procedure repeated at each of these headings, and the calibration values averaged, further increasing the accuracy.
    Type: Grant
    Filed: October 12, 2015
    Date of Patent: October 18, 2016
    Assignee: Innovative Solutions & Support, Inc.
    Inventor: Shahram Askarpour
  • Patent number: 9459098
    Abstract: The magnetic field measurement system comprises a triaxial main sensor (1) for measuring magnetic field that can move jointly with a carrier element (2) capable of generating at least one additional magnetic field disturbing the measurements of said triaxial main sensor (1), said triaxial sensor (1) being adapted for providing orthonormal measurements for a reference magnetic field in the absence of magnetic disturbances due to said carrier element (2). The system comprises means of adjustment (5, 6, 7, 9, 4a, 4b) of said triaxial main sensor (1) comprising a removable additional sensor for magnetic field measurement, that can move jointly with said carrier element (2), and disposed outside said carrier element (2) away from the additional magnetic field or fields.
    Type: Grant
    Filed: May 14, 2009
    Date of Patent: October 4, 2016
    Assignees: Movea, Commissariat A L'energie Atomique et Aux Energies Alternatives
    Inventors: Pierre Grenet, Ismaïl El-Marfouq, Viviane Cattin
  • Patent number: 9400164
    Abstract: A magnetic field sensor provides an angle error value to correct errors of the magnetic field sensor. The angle error value is a function of temperature and magnetic field strength and is used to correct a measured magnetic field angle. Associated methods are also described.
    Type: Grant
    Filed: July 22, 2013
    Date of Patent: July 26, 2016
    Assignee: Allegro Microsystems, LLC
    Inventors: Steven Daubert, Richard Vreeland
  • Patent number: 9341475
    Abstract: In a geomagnetism measurement apparatus, a magnetic sensor detects magnetic data, and a storage unit stores the magnetic data sequentially output from the magnetic sensor. An ellipsoid generation unit calculates each ellipsoidal central point of first, second and third ellipsoids each of which has in the vicinity thereof a plurality of the magnetic data stored in the storage unit. An ellipsoidal central point decision unit decides whether or not a distance between respective ellipsoidal central points is equal to or less than a threshold value. A correction value generation unit calculates an ellipsoidal correction matrix for converting coordinates on an ellipsoid into coordinates on a sphere based on a coefficient matrix representing a shape of one of the first, second and third ellipsoids according to the decision result.
    Type: Grant
    Filed: September 6, 2012
    Date of Patent: May 17, 2016
    Assignee: Yamaha Corporation
    Inventor: Ibuki Handa
  • Patent number: 9238173
    Abstract: An example information processing device calculates an attitude of an input unit having a magnetic sensor. The information processing device repeatedly obtains detected magnetic vectors detected by the magnetic sensor. The information processing device stores the detected magnetic vectors in a storage unit where each detected magnetic vector is classified based on a direction from a reference position to the end point position of the detected magnetic vector. The information processing device repeatedly estimates a center position of a spherical body having a curved surface which is estimated based on the end point positions of detected magnetic vectors obtained by extracting, from among the classified detected magnetic vectors, at least one detected magnetic vector for each class. The attitude of the input unit is calculated based on a direction vector representing a direction from the center position to the end point position of the detected magnetic vector.
    Type: Grant
    Filed: October 31, 2012
    Date of Patent: January 19, 2016
    Assignee: NINTENDO CO., LTD.
    Inventor: Keizo Ohta
  • Patent number: 9228821
    Abstract: An example information processing device calculates an attitude of an input unit having a magnetic sensor. The information processing device repeatedly obtains detected magnetic vectors detected by the magnetic sensor. The information processing device repeatedly estimates a center position of a spherical body having a curved surface which is estimated based on end point positions of the detected magnetic vectors. The attitude of the input unit is calculated based on a direction vector representing a direction from the center position to the end point position of the detected magnetic vector. The information processing device calculates the attitude while relatively decreasing an influence of a newly-obtained detected magnetic vector as the end point position of the newly-obtained detected magnetic vector is farther away from the end point positions of the detected magnetic vectors used for the estimation of the center position.
    Type: Grant
    Filed: October 31, 2012
    Date of Patent: January 5, 2016
    Assignee: NINTENDO CO., LTD.
    Inventor: Keizo Ohta
  • Patent number: 9201526
    Abstract: An example information processing device calculates an attitude of an input unit having a magnetic sensor. The information processing device repeatedly obtains detected magnetic vectors detected by the magnetic sensor. The information processing device repeatedly estimates a center position of a spherical body having a curved surface which is estimated based on end point positions of the detected magnetic vectors. The attitude of the input unit is calculated based on a direction vector representing a direction from the center position to the end point position of the detected magnetic vector. Each time a detected magnetic vector is obtained, the information processing device updates the center position so that at least some of lengths from the center position to end points of the detected magnetic vectors used for the estimation of the center position are brought closer to an average between the lengths.
    Type: Grant
    Filed: October 31, 2012
    Date of Patent: December 1, 2015
    Assignee: NINTENDO CO., LTD.
    Inventor: Keizo Ohta
  • Patent number: 9157747
    Abstract: A method of calibrating a vehicle's heading system, such as the attitude heading and reference system of an aircraft or the heading system of a ship, positioned along the Earth's surface involves obtaining both actual and theoretical readings for the magnetometer of the heading system, and comparing these values to obtain calibration values for the heading system which are then averaged to obtain a universal average gain and offset for the magnetometer. The vehicle may be repositioned, such as to North, South, East, and west magnetic headings, with the procedure repeated at each of these headings, and the calibration values averaged, further increasing the accuracy.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: October 13, 2015
    Assignee: Innovative Solutions and Support, Inc.
    Inventor: Shahram Askarpour
  • Patent number: 9150245
    Abstract: Methods and systems are provided for controlling a steering system of a vehicle is provided. A detection unit is configured to obtain one or more of the following values: a compass heading, a global positioning system (GPS) heading, a yaw velocity, and a difference in tire angular velocities. A processor is coupled to the detection unit, and is configured to determine whether a vehicle is on a straight line path using one or more of the compass heading, the GPS heading, the yaw velocity, and the difference in tire angular velocities, activate the steering system if it is determined that the vehicle is on a straight line path, and disable the feature of the steering system if it is determined that the vehicle is not on a straight line path.
    Type: Grant
    Filed: January 22, 2013
    Date of Patent: October 6, 2015
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Kenneth L. Oblizajek, Stephen R. Pastor, David M. Caldwell, John D. Sopoci
  • Patent number: 9128112
    Abstract: A determination device includes a geomagnetism value obtaining unit for obtaining a geomagnetism value detected with a geomagnetism sensor; and a geomagnetism value determining unit for determining whether a user having the geomagnetism sensor is in a moving state in an automobile or on a train according to a magnitude of a change in the geomagnetism value obtained with the geomagnetism value obtaining unit.
    Type: Grant
    Filed: September 26, 2013
    Date of Patent: September 8, 2015
    Assignee: LAPIS SEMICONDUCTOR CO., LTD.
    Inventor: Kazunori Fujiwara
  • Patent number: 9103670
    Abstract: A method and apparatus are provided for improving the performance of displacement sensors, including absolute displacement sensors, such as inclinometers and accelerometers, and relative displacement sensors such as linear relative position transducers, by reducing or eliminating hysteresis. During use, independent, controlled and limited displacement is induced between the sensing unit and housing or base of such sensors.
    Type: Grant
    Filed: August 19, 2013
    Date of Patent: August 11, 2015
    Inventor: Jack A. Ekchian
  • Patent number: 9097523
    Abstract: A system, method, and computer program product are provided for calibrating a sensor device, such as an accelerometer, gyroscope, and/or magnetometer. The sensor device provides measurements, and a determination if the sensor device is in a steady state is made based at least partly on the measurements. If the sensor device is in a steady state then measurement data is stored in a memory, and the sensor device is calibrated at least partly with the stored data. A set of such steady points is gathered with the sensor device in various spatial orientations, preferably with the steady point orientations spaced appropriately apart to ensure precise calibration throughout the range of possible orientations. Calibration parameters are determined by fitting the set of steady point measurements to an ellipsoid. Active audio and visual guidance may be provided to a user to assist with orienting the sensor device during calibration.
    Type: Grant
    Filed: March 28, 2012
    Date of Patent: August 4, 2015
    Assignee: TRIMBLE NAVIGATION LTD.
    Inventors: Scott Jason Graybill, Farshad Nourozi, Shawn David Weisenburger
  • Patent number: 9068832
    Abstract: A method and an electronic device for determining the direction of a magnetic field, in which a mobile electronic compass device is used to measure three field vectors of the magnetic field the desired number of times. From each measurement, a data point (p1-p6) is formed in a three-dimensional co-ordinate system, for which measured data points a common reference point (C) is calculated. The location of the device is determined relative to the reference point in said co-ordinate system and the co-ordinates of the reference point obtained are compared to the co-ordinates of at least one previous reference point, and the co-ordinate values of the reference point are calibrated, after which the direction of the magnetic field is indicated with the aid of the reference point.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: June 30, 2015
    Assignee: Suunto Oy
    Inventors: Aimo Heikkinen, Mikko Martikka, Erik Lindman
  • Patent number: 9046365
    Abstract: Electronic devices may be provided with compasses for detecting the Earth's magnetic field. Electronic devices may be provided with electronic components that generate interfering magnetic fields for the compass. Electronic components may be coupled between a power supply line and a power return line on a printed circuit. The power return line may be configured to generate a compensating magnetic field to counteract the interfering magnetic fields. The power return line may be formed parallel to the power supply line. The power supply line may have multiple branches equidistant from the compass. The power return line may have a portion closer to the compass than the power supply line and the electronic component. The power return line may have multiple branches, may be provided with resistors on each branch and may include a portion of a circular loop the runs around the compass on the printed circuit board.
    Type: Grant
    Filed: October 27, 2011
    Date of Patent: June 2, 2015
    Assignee: Apple Inc.
    Inventors: Jeremy L. Wade, Michael Eng, Ryan J. Garrone, Mark Brown
  • Patent number: 9037318
    Abstract: Systems and methods for providing aircraft heading information are provided. In one embodiment, an attitude heading reference device comprises: at least one interface for receiving heading information from one or more IRUs; at least one set of gyroscopes and accelerometers; a memory device for storing data representing heading information received via the at least one interface; and a heading calculator coupled to the at least one interface, the at least one set of gyroscopes and accelerometers, and the memory device. The heading calculator generating a heading output signal based on heading information when reliable heading information is received over the at least one interface; the heading calculator generating the heading output signal based on data from the memory device regarding previously reliable heading information and an output of the at least one set of gyroscopes and accelerometers when reliable heading information is not received over the at least one interface.
    Type: Grant
    Filed: May 8, 2013
    Date of Patent: May 19, 2015
    Assignee: Honeywell International Inc.
    Inventors: Mark T. Manfred, Thomas A. Ryno
  • Patent number: 9021709
    Abstract: A method of indicating an interference magnetic field at an electronic device includes: displaying a first arrow indicating a direction of magnetic north on a display of the electronic device, the direction of the first arrow corrected to remove interference caused by an interference magnetic field; and displaying a second arrow indicating a direction of a source of the interference magnetic field on a display of the electronic device.
    Type: Grant
    Filed: November 13, 2012
    Date of Patent: May 5, 2015
    Assignee: Blackberry Limited
    Inventors: Robert George Oliver, Adam Louis Parco, Christopher James Grant
  • Patent number: 9008987
    Abstract: An electronic device is provided with an inclination sensor for computing inclination, a control unit which conducts predetermined control based on a value computed by the inclination sensor, a case which has the inclination sensor and the control unit therein, and a suspension portion for suspending the case, and the control unit controls correction of the reference value of the inclination sensor based on a state where the case is suspended by the suspension portion and still.
    Type: Grant
    Filed: February 27, 2009
    Date of Patent: April 14, 2015
    Assignee: Kyocera Corporation
    Inventors: Shigeki Tanabe, Junya Yano, Yuuya Hirose
  • Patent number: 8952682
    Abstract: A method and system are provided for calibrating a magnetometer of a mobile device. The method comprises displaying a visual indication of a gestural path on a display of the portable electronic device, monitoring for changes in orientation of the portable electronic device, changing the visual indication in response to the monitored changes in the orientation of the portable electronic device, measuring a magnetic field with the magnetometer, and calibrating the magnetometer in accordance with measurements of the magnetic field acquired at different points along the gestural path.
    Type: Grant
    Filed: August 26, 2011
    Date of Patent: February 10, 2015
    Assignee: BlackBerry Limited
    Inventors: Laura Mahan, Jeffrey Charles Bos, Przemyslaw Abratowski, Christopher Harris Snow, Steve Robert Grenier, Nazih Almalki
  • Publication number: 20150000145
    Abstract: Apparatus and methods to compensate hard iron and soft iron magnetic interference in magnetic sensing devices are described. Hard and soft iron interference may be modeled using an ellipsoidal surface generated by a plurality of magnetic field measurements. A displacement of the ellipsoid from a reference frame origin corresponds to hard iron or permanent magnetic field interference. A shape and orientation of the ellipsoid corresponds to soft iron magnetic field interference. The ellipsoidal surface may be analyzed to obtain magnetic field compensation values for cancelling hard iron and soft iron interference.
    Type: Application
    Filed: June 18, 2014
    Publication date: January 1, 2015
    Applicant: STMicroelectronics (China) Investment Co. Ltd.
    Inventors: Travis Tu, Shu Fang
  • Patent number: 8880373
    Abstract: Methods and apparatus are described herein for calibration and correction of non-constant sensor errors, and in particular non-constant compass errors, that are based in part on changing software and hardware modes of a host device. The non-constant errors induced in the sensor by each mode and combination of modes is determined in a calibration that may be determined during pre-production testing of one or more host devices. The calibration results can be incorporated into software and/or hardware of the host device. During normal operation, a sensor correction can be applied to sensor measurements based in part on the active mode or combination of modes.
    Type: Grant
    Filed: November 4, 2009
    Date of Patent: November 4, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Victor Kulik, Christopher Brunner
  • Patent number: 8844148
    Abstract: A method of determining a direction of a triaxial electronic compass oriented in a specific direction by using the triaxial electronic compass and an inclination sensor, the method includes obtaining an elevation angle of the specific direction from the inclination sensor to switch a selection of two output values from the three output values to another selection of two output values therefrom; determining a geomagnetic aspect from the two output values; obtaining a rotational angle about an axis extending in the specific direction from the inclination sensor; calculating a deviation angle of the direction of the triaxial electronic compass which is caused by the selection switching, in accordance with the elevation angle, the geomagnetic aspect and the rotational angle; and correcting the direction of the triaxial electronic compass in accordance with the deviation angle.
    Type: Grant
    Filed: June 11, 2012
    Date of Patent: September 30, 2014
    Assignee: Pentax Ricoh Imaging Company, Ltd.
    Inventor: Makoto Ohta
  • Patent number: 8825425
    Abstract: A mobile device has a geomagnetic sensor, a position detection device, such as an acceleration sensor, for detecting a position of the mobile device, or a direction of a mobile device and a form of the mobile device, and a controller operable to control the geomagnetic sensor and the position detection device. When the position detection device detects a predetermined position change, the controller starts a correction process of the geomagnetic sensor based upon the detection.
    Type: Grant
    Filed: April 26, 2010
    Date of Patent: September 2, 2014
    Assignee: NEC Corporation
    Inventor: Junichi Kadokura
  • Publication number: 20140182148
    Abstract: A method and an electronic device for determining the direction of a magnetic field, in which a mobile electronic compass device is used to measure three field vectors of the magnetic field the desired number of times. From each measurement, a data point (p1-p6) is formed in a three-dimensional co-ordinate system, for which measured data points a common reference point (C) is calculated. The location of the device is determined relative to the reference point in said co-ordinate system and the co-ordinates of the reference point obtained are compared to the co-ordinates of at least one previous reference point, and the co-ordinate values of the reference point are calibrated, after which the direction of the magnetic field is indicated with the aid of the reference point.
    Type: Application
    Filed: March 15, 2013
    Publication date: July 3, 2014
    Applicant: SUUNTO OY
    Inventor: Suunto Oy
  • Patent number: 8718938
    Abstract: The subject matter disclosed herein relates to the control and utilization of multiple sensors within a device. For an example, motion of a device may be detected in response to receipt of a signal from a first sensor disposed in the device, and a power state of a second sensor also disposed in the device may be changed in response to detected motion.
    Type: Grant
    Filed: March 24, 2008
    Date of Patent: May 6, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Thomas G. Wolf, Leonid Sheynblat, Alexander Hodisan
  • Patent number: RE45023
    Abstract: A hybrid three-axis magnetic sensor for calculating the accurate direction of the earth magnetism. The hybrid three-axis magnetic sensor includes: a flux gate type magnetic sensor which is so formed that a base serves as a main member and detects two axis components of a magnetic vector defined by a plane parallel to the base; a Hall element which detects another component of the magnetic vector orthogonal to the base; a tilt sensor which detects a tilt angle of the base; and a CPU, wherein the flux gate type magnetic sensor and the Hall element are integrally structured together as a hybrid IC. The thus detected three dimensional magnetic vector is corrected in the light of inclination of the base, so that the direction of the earth magnetism is accurately calculated.
    Type: Grant
    Filed: December 17, 2012
    Date of Patent: July 22, 2014
    Assignee: Naos Innovation, LLC
    Inventor: Yasuhiro Tamura