A method of harmonizing a first inertial measurement unit and a second inertial measurement unit with each other includes the steps of: causing a control unit to compare the vectors measured by the inertial measurement units in order to determine a specific force difference and a rotation difference while taking account of the lever arms between the two measurement units; and causing the control unit to determine a harmonization value from the specific force difference and the rotation difference while taking account of the lever arms between the two measurement units. Navigation apparatus performs the method.

A method and a system include a first inertial measurement unit (IMU) is positioned on a first member of a joint and a second IMU is positioned on a second member of the joint, where the first IMU and the second IMU each lack a magnetometer unit. A processing device receives first IMU sensor data and second IMU sensor data. The first IMU sensor data is inputted into a quaternion computation algorithm (QCA) to compute a first quaternion. The first quaternion and the second IMU sensor data are inputted into the QCA to compute a one second quaternion, where the inputting of the first quaternion imposes yaw constraints. A calibration parameter algorithm determines a mobility metric of the joint based on the first and the second quaternions, and an orientation and position of the first IMU on the first member and of the second IMU on the second member.

A device for determining motion in virtual or real spaces is arranged inside at least one shoe, provided with a sole which can tilt along one or more directions. The device includes at least one gyroscope provided with an accelerometer, a module for transmitting data to a virtual reality viewing device or to a computer, which include elements adapted to process the data in order to provide the direction of motion in the virtual or real space, a power supply source.

A component protection apparatus includes a chamber configured to enclose a component that is to be protected and contain a liquid that surrounds the component. The liquid is configured to reduce an amount of an impact on the chamber that is transferred to the component. The component protection apparatus further includes a temperature control system configured to permit heating and cooling of the liquid.

In an inertial sensor that includes an angular rate detection circuit having a structure synchronized with a resonant frequency of an angular rate detection element, an object thereof is to realize an angle output having high accuracy with less integration error in an integration circuit for detecting an angle. The inertial sensor includes an angular rate detection element chip C1 that has a mechanical structure for angular rate detection; and a signal processing LSI chip C2 that is angular rate detection circuit for detecting an angular rate from the angular rate detection element chip C1. The signal processing LSI chip C2 calculates an angle by sampling a signal obtained from the angular rate detection element chip C1 at a discrete time synchronized with a drive frequency of the angular rate detection element chip C1.

Technologies for tracking and locating underground assets include a survey instrument having an asset tracking device. The asset tracking device determines a current geographic location of the survey instrument and a heading of a sensor group of the survey instrument when aimed at a target measurement point of an underground asset. The asset tracking device measures the distance between the sensor group and the target measurement point of the underground asset. The asset tracking device also determines the pitch of the sensor group when aimed at the target measurement point of the underground asset. The effective height of the sensor group relative to the elevation at the survey location is also determined. The asset tracking device determines the geographic location and a corresponding depth of the target measurement point on the underground asset based on the determined and measured information.

Equipment including an inertial detector device provided with fastener studs enabling the inertial device to be fastened to a support frame. At least one of the fastener studs has two elements, one of which elements is fastened to the support frame and has a bearing surface that is in contact with a bearing surface of the support frame. The other element is fastened to the inertial device and has a bearing surface that is in contact with a bearing surface of the inertial device, which two elements are suspended relative to each other by means of a body made of elastically deformable material. At least one of the elements is fastened by at least one screw. The corresponding bearing surfaces is provided respectively with a centering portion and with a housing for receiving said centering portion with a fit that allows clearance of no more than 50 m.

An aerial vehicle comprising an airframe, an aircraft flight controller to provide an output control signal, and a planar printed circuit board positioned on the airframe. The printed circuit board may include coupled thereto a processor, a rate gyroscope, and at least three accelerometers. The processor is configured to generate an actuation signal based at least in part on a feedback signal received from at least one of said rate gyroscope and the at least three accelerometers. The processor communicates the actuation signal to said aircraft flight controller, which is configured to adjust the output control signal based on said actuation signal.

The present disclosure provides an unmanned aerial vehicle (UAV). The UAV includes a main body; an inertial measurement unit (IMU) disposed in the main body; a mounting bracket for fixing the IMU; and a circuit board fixedly disposed at the main body and integrated with a plurality of functional modules. The IMU is fixed on the circuit board through the mounting bracket.

Sensor data is received from an inertial measurement unit on a vehicle. An observed attitude and an observed attitude rate of the vehicle are determined based on the sensor data. Using a model associated with a vehicle failure mode, an expected attitude and an expected attitude rate of the vehicle are determined. A malfunctioning rotor is determined based on the observed attitude, the observed attitude rate, the expected attitude, and the expected attitude rate. In response to identifying the malfunctioning rotor, a responsive action is performed, including by updating a geometry matrix so that at least one non-malfunctioning rotor in the plurality of rotors compensates for the malfunctioning rotor.