The tape-suspended fully mechanical meridian gyroscope makes it possible to achieve the objective of north-seeking significantly more economically than before. The gyroscope is started up to the necessary rotational speed at the gyroscope cap thereof by an external force source in order to then rotationally move towards north, while suspended on the supporting tape, as a coast-down gyroscope. In order to stop a persisting rotation that goes beyond north, a damping means intervenes until a standstill is reached at north. In order to reliably achieve this, a system that can be finely adjusted with respect to the friction forces is used as the damping means. The north-seeking system according to the invention should be used especially in tunnel construction and in road construction, in azimuth finding, in mountainous terrain, and in many special technical tasks. Failures having electrical or electronic causes do not occur.

The tape-suspended fully mechanical meridian gyroscope makes it possible to achieve the objective of north-seeking significantly more economically than before. The gyroscope is started up to the necessary rotational speed at the gyroscope cap thereof by an external force source in order to then rotationally move towards north, while suspended on the supporting tape, as a coast-down gyroscope. In order to stop a persisting rotation that goes beyond north, a damping means intervenes until a standstill is reached at north. In order to reliably achieve this, a system that can be finely adjusted with respect to the friction forces is used as the damping means. The north-seeking system according to the invention should be used especially in tunnel construction and in road construction, in azimuth finding, in mountainous terrain, and in many special technical tasks. Failures having electrical or electronic causes do not occur.

Systems and methods are provided for producing a continuous survey of a previously drilled portion of a wellbore. The method includes receiving a plurality of stationary survey measurements taken at a corresponding plurality of locations along the portion of the wellbore. The method further includes receiving at least one continuous survey including a plurality of continuous survey measurements taken between a pair of stationary survey measurements of the plurality of stationary survey measurements. The method further includes combining the plurality of stationary survey measurements and the plurality of continuous survey measurements to produce the continuous survey of the portion of the wellbore.

Systems and methods are provided for producing a continuous survey of a previously drilled portion of a wellbore. The method includes receiving a plurality of stationary survey measurements taken at a corresponding plurality of locations along the portion of the wellbore. The method further includes receiving at least one continuous survey including a plurality of continuous survey measurements taken between a pair of stationary survey measurements of the plurality of stationary survey measurements. The method further includes combining the plurality of stationary survey measurements and the plurality of continuous survey measurements to produce the continuous survey of the portion of the wellbore.

The invention relates to an inertial navigation system for a carrier comprising a core comprising gyroscopic sensors making it possible to determine the angular velocity thereof according to three axes defining a reference trihedron, two of the axes defining a reference plane and the third axis being at right angles to this plane. The device comprises command and control means making it possible to rotate the core about the third axis and to determine the direction of the geographic north on the basis of the information supplied by the gyroscopic sensors and by an accelerometer placed in the reference plane; the rotation of the core being performed with a period for which the value of the Allan variance of the stability error of the gyroscopic sensors is lower than a given value guaranteeing the accuracy with which the direction of the geographic north can be known.

The invention relates to an inertial navigation system for a carrier comprising a core comprising gyroscopic sensors making it possible to determine the angular velocity thereof according to three axes defining a reference trihedron, two of the axes defining a reference plane and the third axis being at right angles to this plane. The device comprises command and control means making it possible to rotate the core about the third axis and to determine the direction of the geographic north on the basis of the information supplied by the gyroscopic sensors and by an accelerometer placed in the reference plane; the rotation of the core being performed with a period for which the value of the Allan variance of the stability error of the gyroscopic sensors is lower than a given value guaranteeing the accuracy with which the direction of the geographic north can be known.

A stabilization arrangement (10) for stabilizing an antenna mast (3), comprising an antenna mast (3) and a gyroscopic stabilizer device (12), wherein the gyroscopic stabilizer device (12) in turn comprises a flywheel (11), a flywheel axis (14), wherein the flywheel (11) is arranged about the flywheel axis (14), and a gimbal structure (13), wherein the flywheel (11) is suspended in the gimbal structure (13) and the gimbal structure (13) is configured to permit flywheel precession or tilting about at least one gimbal output axis (16). The gyroscopic stabilizer device (12) is fixedly arranged in connection to a first end portion (31) of the antenna mast (3) and the antenna mast (3) is fastenable to a supporting structure at a second end portion (32) of the antenna mast (3), wherein the gyroscopic stabilizer device (12) is configured to reduce movements in a plane perpendicular to the extension of the antenna mast (3).

The invention relates to an inertial measuring device, having an inertial measuring unit for determining a north direction and for determining position angles, having a battery, and having a wireless interface, which inertial measuring device has a housing, in which the inertial measuring unit, the battery and the interface are housed. A carrying handle is provided on the housing, which carrying handle is designed as a one-hand carrying handle such that the inertial measuring device can be carried with only one hand during normal use.

The invention relates to an inertial measuring device, having an inertial measuring unit for determining a north direction and for determining position angles, having a battery, and having a wireless interface, which inertial measuring device has a housing, in which the inertial measuring unit, the battery and the interface are housed. A carrying handle is provided on the housing, which carrying handle is designed as a one-hand carrying handle such that the inertial measuring device can be carried with only one hand during normal use.

An implantable medical device (IMD) that includes a housing, a first electrode secured relative to the housing, a second electrode secured relative to the housing, and a gyroscope secured relative to the housing. The IMD may include circuitry in the housing in communication with the first electrode, the second electrode, and the gyroscope. The circuitry may be configured to determine and store a plurality of torsion data measurements, from which a representation of a twist profile may be determined.