Abstract: A shooting rest for different weapons provides ends that are offset from the central portion of the rest to provide a space that accommodates a portion of the weapon being used with the rest. The shooting rest can be used with one or two supports that engage the weapon being used with the rest. Each support can be rotationally adjusted about a vertical axis and tilted about a horizontal axis. Each support can be tilted inwardly to a storage position for storage and transport of the rest. When in use, the entire rest can be tilted about its main support. A support assembly includes an adjustable arm that carries the shooting rest from the top of a monopod that is anchored to allow repositionable use without interference with the hunter's legs.

Abstract: A bow includes a handle and upper and lower limbs. The upper and lower limbs are formed of a laminated fiber-reinforced plastic material. The upper limb has first and second sets of fiber sheets stacked in a direction along a lateral axis. The first set of fiber sheets have fibers aligned at a first angle from a longitudinal axis, and the second set of fiber sheets having fibers aligned at a second angle from the longitudinal axis in an opposite direction. The lower limb has third and fourth sets of fiber sheets stacked in a direction along the lateral axis. The third set of fiber sheets have parallel fibers aligned at a third angle from the longitudinal axis, and the fourth set of fiber sheets having fibers aligned at a fourth angle from the longitudinal axis in an opposite direction. The angles are between 16 and 44 degrees.

Abstract: The present disclosure provides for a cam assembly, the cam assembly comprising a main cam, a shoot cam coupled to the main cam, and a charge cam coupled to the main cam, wherein the main cam, the shoot cam, and the charge cam are configured to rotate in response to an external force, and the charge cam is configured to persistently store potential energy in the cam assembly upon rotation of the charge cam a predetermined distance.

Abstract: A mass based tuning system for an archery bow includes rotatable members or cams of the archery bow and a plurality of weights configured to removably attach to the rotatable members (e.g., cams). Modern compound bows have rotatable members (e.g. cams) that provide energy from bow limbs to the bowstring during release or firing of the bow. The shape of the rotatable members has the greatest effect on the energy delivery profile of the bow (i.e., energy or acceleration over time during release or firing of the bow), and mass distribution about the rotatable member has the second highest effect on the energy delivery profile of the bow. Weights are added to (or removed from) corresponding recesses in or holes through the rotatable member to alter the energy delivery profile of the bow in order to fine tune a bow to a given arrow.

Abstract: A crossbow that includes a frame along which a movement trajectory of an arrow substantially passes, a first limb and a second limb connected to the frame on opposite sides from the movement trajectory. Each of said limbs having a loose end. The crossbow further includes a first cam having a first rotation axle and a second cam having a second rotation axle. The cams rotatably arranged on a first holder and on a second holder, respectively. The holders fixed on said frame on opposite sides from the movement trajectory. In addition, the crossbow is provided with a bowstring connecting the first cam and the second cam, a first cable connecting the first cam and the loose end of the first limb, and a second cable connecting the second cam and the loose end of the second limb.

Abstract: An archery bow with a riser including a mount in a centerline plane of the riser above a lower wall of a sight window of the riser may allow for a novel manner of mounting an archery accessory. Placement of the mount within a centerline plane of the riser may maintain the weight of the archery accessory along a center of the bow, thereby reducing or eliminating asymmetrically weighted bows or the need for an additional stabilizer to balance the weight of the archery accessory. Positioning the mount above the lower wall of the sight window additionally allows for coordination of the position of a secondary accessory, such as a sight, a light, or a camera, in addition to mounting an arrow rest, such as in a lower wall of the sight window, while maintaining the centralized weight advantages noted above.

Abstract: A limb pad assembly for an archery bow includes an elongated body that articulates about a lateral axis and/or has a curved working surface that contacts a limb of the bow spaced from a riser of the bow by the limb pad assembly. The articulation and/or curved working surface serve to distribute stress along the limb during drawing and firing of the bow to reduce noise and vibration during firing of the bow and to reduce material fatigue in the bow limb, preventing premature limb failure.

Abstract: A device for attachment-detachment of a slide for toy gun only by operating a single lever without using any tool, includes a toy gun body, a slide at an upper part of the toy gun body while covering a barrel, and slidingly movable in directions toward the barrel and rear side of the toy gun, a takedown lever disposed on the toy gun body surface at a boundary with the slide, and rotatingly movable along the toy gun body surface, and a slide block crank that comes in contact with a slide block abutment portion of a shaft support portion of the slide to prevent the slide from moving toward the rear end side, and moves in muzzle/non-muzzle directions accompanying with the rotating motion of the takedown lever. The slide block crank extends closer to a muzzle in moving in the muzzle direction than in moving in the non-muzzle direction.

Abstract: A barrel catch of a toy gun has a barrel through hole with diameter larger than outer circumference of the barrel so that the barrel penetrates through hole center. The barrel catch includes a barrel fitting portion fitted/attached to the barrel on the inner circumference of the hole opposite to the pressing portion exposed from an opening in a barrel attachment portion of a toy gun body. The barrel catch is housed in a housing portion of the toy gun body slidably in the direction defined by the pressing portion and the opposite portion of the pressing portion. The barrel includes a barrel catch fitting portion fittable to the barrel fitting portion of the barrel catch upon penetration of the barrel through the barrel catch. The barrel slidably penetrates the barrel through hole of the barrel catch in the direction defined by the pressing portion and the opposite portion.

Abstract: A handgun mounted accessory such as a laser sight is combined with a triggerguard mounted flush profile switch to provide high reliability of operation. The switch is designed and located to provide passive user switching in use without separate movement or applied force of the user's hand or fingers.

Abstract: At least one sensor is configured to detect a user aiming at a point and movement of the firearm. A processor is provided to process and analyse movement data obtained wherein the at least one sensor is adapted to measure a movement deviation from the line of sight between an eye of the user and the point of aim of the firearm. At least one electro-mechanical actuator to apply a correction to the barrel as to maintain aim on the intended point of aim.

Abstract: A network of scopes, including one or more lead scopes and one or more follower scopes, is provided to allow scope operators of the respective scopes to track the same presumed target. A lead scope locates a target and communicates target position data of the presumed target to the follower scope. The follower scope uses the target position data and its own position data to electronically generate indicators for use to prompt the operator of the follower scope to make position movements so as to re-position the follower scope from its current target position to move towards the target position defined by the target position data received from the lead scope.

Abstract: A mission planning method for use with a weapon is disclosed. The method comprises: obtaining a first training data set describing the performance of the weapon; using the first training data set and a Gaussian Process (GP) or Neural Network to obtain a first surrogate model giving a functional approximation of the performance of the weapon; and providing the first surrogate model to a weapons system for use in calculating a performance characteristic of the weapon during combat operations.

Abstract: The improved rail interface system uses a spring tensioned “locking” shoe that extends from the accessory body into the rail opening to restrictively engage the edges of the rail openings and hold the weapon accessory against the weapon or weapon component. The locking shoe mechanisms is incoporated into a weapon light mount but may be adapted for use with M-Lok® style rail openings without the use of specialized nuts and fasteners.

Abstract: A dead stop assembly includes a deceleration member which is attachable at one end to a rail such that when a target retriever applies force to the deceleration member, the target retriever is decelerated. The deceleration member may be disposed in a housing which further engages the rail when the housing is impacted by a target retriever.

Abstract: The present invention provides a polymer ammunition cartridge having a primer insert having: a top surface; a bottom surface opposite the top surface; a coupling element that extends from the bottom surface, wherein the coupling element comprises an interior surface and an exterior surface, wherein the interior surface comprises: a transition region that transitions from the bottom surface to a second segment wherein the transition region has a radius of from 0.02 to 0.08; a first segment extending from the second segment and terminates at a tip, wherein the first segment has a first segment distance from 0.05 to 0.09 inches and the second segment has a second segment distance from 0.05 to 0.

Abstract: The present invention provides a polymer ammunition cartridge having a primer insert having: a top surface; a bottom surface opposite the top surface; a coupling element that extends from the bottom surface, wherein the coupling element comprises an interior surface and an exterior surface, wherein the interior surface comprises: a transition region that transitions from the bottom surface to a second segment wherein the transition region has a radius of from 0.02 to 0.2; a first segment extending from the second segment and terminates at a tip, wherein the first segment has a first segment distance from 0.02 to 0.18 inches and the second segment has a second segment distance from 0.02 to 0.

Abstract: The present invention provides a polymer ammunition cartridge having a primer insert having: a top surface; a bottom surface opposite the top surface; a coupling element that extends from the bottom surface, wherein the coupling element comprises an interior surface and an exterior surface, wherein the interior surface comprises: a transition region that transitions from the bottom surface to a second segment wherein the transition region has a radius of from 0.1 to 0.2; a first segment extending from the second segment and terminates at a tip, wherein the first segment has a first segment distance from 0.06 to 0.14 inches and the second segment has a second segment distance from 0.05 to 0.

Abstract: The present invention relates to a firearm projectile capable of releasing a secondary payload mid-flight through a pyrotechnic timing mechanism. Once the firearm is fired, the powder in the casing pushes out the projectile as a typical round. In addition, the powder ignites the delay column. The formulation and amount of delay pyrotechnics determines the delay time. When the delay column is burned, the final portion ignites an expelling charge. The expelling charge builds pressure in the projectile casing and separates the base plug from the main projectile housing. The expelling assembly pushes out the secondary payload out the rear of the projectile. Although the payload exits the rear of the projectile at minimum velocity, the net velocity of the payload is still in the forward direction.

Abstract: An article comprising an electronic safe-arm and fire (ESAF) device for a supercavitating cargo round (SCR) includes discrete electronics, a high-voltage capacitor, a high-voltage switch, and an exploding foil initiator. The discrete electronics includes digital-delay timer circuits, discrete logic circuits, accelerometers, and circuitry for enabling the high-voltage switch. In a method for implementing the safe and arm protocols, sensor readings from sensors on a weaponized UUV are obtained and, when certain conditions are achieved, remove inhibit signals are forwarded to a controller onboard the UUV. When such signals are received in a specified order, and within certain optional specified time delays, the controller arms the ESAF within the SCR. After the SCR fire and leaves the barrel on the UUV, the ESAF monitors certain acceleration/deceleration conditions unique to supercavitation, and applies same to determine whether to detonate the SCR's energetic payload.

Abstract: A method of packaging a measuring tape device such that an internal feature of the measuring tape device is exposed may include supporting a housing of the measuring tape device on a base portion of an internal feature exposing holder, and proximate to a backing portion of the internal feature exposing holder, extending a portion of a blade of the measuring tape device from the housing to engage a hook capturing edge of an extension portion, and retaining the housing with the base portion and the backing portion such that a portion of the blade remains exposed.

Abstract: A measuring instrument that reads a measure including a plurality of reading patterns arranged in a length direction of the measure, each reading pattern including a plurality of patterns arranged in a width direction of the measure, includes: a flattening member that increases a flatness of the measure; and a first reader that optically reads the plurality of patterns arranged in the width direction included in a single reading pattern from the measure in a state where the flatness is increased by the flattening member.

Abstract: A device configured to provide a faster and more accurate measurement of depths of holes for placement of bone screws and fastener for bone implant fixation procedures. The device includes a combination of a bone probe for physical examination of a hole drilled in a bone and a depth gauge member for determining a depth of the hole and providing digital measurement of the depth via a display on the instrument and/or via a wireless exchange of measurement data to a remote computing device, such as a tablet or smartphone. The device may further be connected to a separate neuromonitoring device and be used for nerve sensing and/or nerve stimulation by way of the bone probe. For example, the bone probe may include a conductive material such that the distal probe tip acts as an extension of the neuromonitoring device and may be used to sense and/or stimulate nerves.

Abstract: A device for the hot measuring, during rolling, of a transverse size of a metal profile (12) includes a transmission element with at least two sections distinct and spatially separated from each other and disposed along a nominal axis of feed of the metal profile, configured to generate an electromagnetic field with a desired profile of force lines, and a reception element disposed along the nominal axis in a position comprised in the overall longitudinal bulk of the transmission element and configured to detect a signal relating to the variations of the electromagnetic field due to the passage of the metal profile.

Abstract: A method for the hot measuring of a transverse size of a metal profile to obtain the measurement of a diameter and/or a mean thickness of said metal profile, providing power with a sinusoidal current having at least two frequencies, a transmission element having at least two sections distinct and spatially separated from each other and disposed along a nominal axis of feed of the metal profile, generating with said transmission element an electromagnetic field with a desired profile of the force lines, and detecting a signal relating to the variations of said electromagnetic field due to the passage of said metal profile through said sections of said transmission element by means of a reception element having one or more sections distinct and spatially separated from each other and disposed along said nominal axis in a position of said transmission element.

Abstract: An automatic calibration optical interferometer comprises: a light source; an optical interference assembly, which divides a low coherent light into a first and a second incident light; an optical sampling assembly, with a first end receiving the first incident light and a partially reflective window at the second end being configured to divide the first incident light into a first reflected light and a first penetrating light configured to be emitted to the test sample; an optical reference assembly, with a reference mirror and an actuator, wherein the optical sampling assembly emits the second incident light to the reference mirror to generate a second reflected light, and the actuator moves the reference mirror; a polychromator, which outputs a displacement signal according to an optical path difference variation between the first and second reflected lights; and a displacement controller, which controls the actuator according to the displacement signal.

Abstract: An optical interferometer includes a beam splitter module and an optical sensor. The beam splitter module includes a lens assembly and a splitter cube. A light incident surface of the splitter cube is substantially orthogonal to an optical axis of the lens assembly. An acute angle is between the light incident surface and a light splitting surface of the splitter cube. A sampling surface of the splitter cube is substantially parallel to the light incident surface. A light reflecting surface of the splitter cube is substantially orthogonal to the light incident surface. The light incident surface is closer to the lens assembly than the sampling surface. A reference arm is defined between a splitter position on the light splitting surface and the light reflecting surface, a sample arm is defined between the splitter position and the sampling surface, and the reference arm is longer than the sample arm.

Abstract: There is provided a first positioning electronic device for use in a system of positioning electronic devices. The first positioning electronic device includes a first projector for projecting a structured light pattern on a reflective surface. In addition, the first positioning electronic device includes an image sensor for detecting all or part of one or more reflected structured light patterns projected using a second projector of a second positioning electronic device. Also, the first positioning electronic device include a communications transceiver for transmitting and receiving communication signals to the second positioning electronic device. The first positioning electronic device also includes a control logic processor for determining a relative position of the positioning electronic device relative to the second positioning electronic devices using the detected reflected structured light patterns.

Abstract: A digital displacement sensor and a displacement measuring method thereof, pertaining to the technical field of displacement sensors. The digital displacement sensor includes a housing and a circuit board, and the circuit board is arranged inside the housing. The housing is provided with a window and an opening. The circuit board is provided with a signal acquisition module, an analog front end circuit, a digital compensation circuit, and a signal output interface. The digital displacement sensor allows to alternatively fix the sensor or measured object according to the structure. The measurement can be performed as long as a relative movement between the sensor and the measured object occurs. Factors such as material of the measured object etc. are not limited, so materials such as steel belts, aluminum plates, plastics etc. can be flexibly used. Merely surfaces of the measured object need to be coated with corresponding stripes.

Abstract: A thickness measuring apparatus includes a white light source for emitting white light, a dispersing mechanism for producing time differences corresponding to the wavelengths of light components of the white light to thereby generate spectral light, the spectral light being applied to the workpiece and then reflected on the upper surface and the lower surface of the workpiece to obtain return light, a two-dimensional image sensor having a photodetecting area for detecting the return light, the photodetecting area including a plurality of pixels, a storing section for storing the intensity of the return light detected by the plural pixels according to wavelength with time difference, the intensity of the return light detected by each pixel being stored as a spectral interference waveform, and a thickness computing section for computing the thickness of the workpiece from the spectral interference waveform stored in the storing section.

Abstract: A thickness measuring apparatus including a thickness measuring unit for measuring the thickness of a plate-shaped workpiece. The thickness measuring unit includes a white light source for emitting white light, a dispersing mechanism for producing time differences corresponding to wavelengths of light components of the white light to thereby generate spectral light, a two-dimensional image sensor having a photodetecting area for detecting the return light, the photodetecting area including a plurality of pixels, a storing section for storing the intensity of the return light detected by the plural pixels according to wavelength with time difference, a waveform table previously storing a plurality of kinds of sample spectral interference waveforms respectively corresponding to different thicknesses of the workpiece, and a thickness deciding section for deciding the thickness at an X-Y coordinate position in a two-dimensional area of the workpiece.

Abstract: A method for nondestructive measurement of an underlying layer thickness includes irradiating, with a pump laser pulse, a sample to induce generation of an acoustic wave in the sample such that the acoustic wave propagates through the sample over time, where the sample includes a substrate, an underlying layer on the substrate, and an overlying layer on the underlying layer and the underlying layer is isolated from an exterior of the sample by at least the overlying layer, irradiating the sample with a probe laser pulse after irradiating the sample with the pump laser pulse, determining a reflectance variation of the sample over time, based on monitoring a variation of a reflection of the probe laser pulse from the sample over time, to generate a first graph showing a variation of reflectance of the sample over time, and determining a thickness of the underlying layer based on the first graph.

Abstract: An image measurement apparatus, which functions as a non-contact profile-measuring device, includes: an image sensor as an image pick-up device; a variable focal length lens (liquid lens unit) disposed on an optical axis extending from a workpiece to the image sensor; and a controller (image-pickup lens controller and image measurement processor) configured to control the variable focal length lens and process a detected image by the image sensor. The image measurement apparatus, which also functions as a non-contact displacement-detecting device, includes: an image sensor; a variable focal length lens (liquid lens unit) disposed on an optical axis extending from the workpiece to the image sensor; and a controller (displacement-detection lens controller and profile measurement processor) configured to control the variable focal length lens and a detected image by the image sensor.

Abstract: The present invention is a device for the complete acquisition of the shape of an object by means of a plurality of image sensors arranged around a space for image capture. Image sensors capture a plurality of images that are carried to a reconstruction system formed from said plurality of images corresponding to different views of the object. Document EP2511653 discloses a system where the object falls through the trap area so that there is no type of fastener or support which hides some part of the object. The present invention is a device for the acquisition and reconstruction of objects characterized by the use of an actuator serving as launcher and configured so that the object is positioned at the point of capture of images at either zero or very close to zero speed to improve the resolution of each image without blurring due to movement, even with relatively long exposure times. Additionally, the actuator is configured so that the fall of the object is such that it prevents damage by the impact effect.

Abstract: A sensor calibration system includes a calibration tool with a vertical rail defining a first axis, and two carriage assemblies. One carriage assembly is supported by the vertical rail, movable along the first axis, and has a horizontal rail defining a second axis transverse to the first axis. Another carriage assembly is coupled to the horizontal rail, and has a transverse mounting bar with a plurality of target mounts, each target mount configured to releasably support a respective calibration target.

Abstract: A support structure having a vertical element supporting a set of cameras associated with a vehicle measurement or inspection system together with at least one target structure required for realignment or recalibration of onboard vehicle safety system sensors. A camera crossbeam carried by the support structure locates the set of cameras as required to view a vehicle undergoing measurement or inspection. The target structure is affixed to the vertical element of the support structure, at an elevation suitable for observation by at least one vehicle onboard sensors during a realignment or recalibration procedure. A set of rollers facilitates positioning of the target structure on a supporting floor surface during a realignment or recalibration procedure.

Abstract: In a road surface condition determining device, when determining a road surface condition, a vibration detection unit, a waveform processing unit and a data transmission unit for implementing a sensing function and a data transmission function are not set continuously to an active state for all tire side device, but at least only one tire side device is set to an active state. Remaining one or more is set to a sleep state. A reduction in power consumption of the tire side devices set to the sleep state can thus be achieved. Further, with regard to the at least one tire side device, since the sensing function and the data transmission function remain in the active state, the road surface condition can be reliably determined based on the road surface data of the tire side device.

Abstract: A method for distance detection includes detecting a first distance value between a movable object and a target object in a target direction of the movable object, obtaining an inclination angle of the movable object at the target direction, and calculating a second distance value from the movable object to the target object based upon the inclination angle and the first distance value.

Abstract: A tilt detection device uses externally generated electromagnetic signal sources to detect changes in relative orientational positioning of an object. A sensor (18) monitors intensity characteristics of electromagnetic stimuli received from remotely located sources, and a controller (16) utilises changes in those characteristics to inform detection and/or measurement of a state of tilting of an object to which the sensor is mounted.

Abstract: A piezoelectric body of a sensor includes a driving arm and detecting arm which extend from a base part in a y-axis direction. Excitation electrodes vibrate the driving arm in an x-axis direction. Detecting electrodes enable detection of a signal due to deformation in a z-axis direction of the detecting arm. The piezoelectric body has anisotropy causing vibration of torsional deformation when the driving arm vibrates in the x-axis direction. When the driving arm bends to a +x side, the base part flexes so that a connection position in the base part is displaced to one side in the z-axis direction. The cross-section of the driving arm perpendicular to the y-axis direction causes a bending stiffness to the +x side and to the other side in the z-axis direction is smaller than a bending stiffness to the +x side and to the one side in the z-axis direction.

Abstract: A MEMS gyroscope is provided. The MEMS gyroscope includes a weight provided with elastic assemblies at four corners thereof. The elastic assemblies are arranged in one of diagonal directions of the weight. An electronic device is also provided applying the gyroscope of the present invention.

Abstract: A gyroscope is provided. The gyroscope includes a fixing frame and a vibration unit accommodated in the fixing frame. The vibration unit includes a weight and a connection frame surrounding the weight. The gyroscope further includes a first connection member connecting the vibration unit and the fixing frame and a second connection member connecting the weight and the connection frame, in such a manner that the vibration unit rotates about the first connection member as a central axis and the weight rotates about the second connection member as a central axis.

Abstract: A gyroscope includes four drive masses and four sense masses. Each drive mass is adjacent to two other drive masses and opposite the fourth drive mass, and each sense mass is adjacent to two other sense masses and opposite the fourth sense mass. Each drive mass may oscillate in a manner that is perpendicular to its adjacent drive mass and parallel and anti-phase to its opposite mass. The sense motion of the each sense mass may be coupled in a manner that prevents motion due to linear acceleration or angular acceleration.

Abstract: A navigational device includes a microprocessor, a target marking system, a digital tilt sensor, and a digital compass to determine mapping coordinates of a remote point from an observation point. A user first visually targets the remote point using the target marking system. The digital tilt sensor then determines an angle of inclination to the remote point from the observation point. The digital compass then determines a bearing angle to the remote point from the observation point. The GPS module then determines the GPS coordinates of the observation point. Lastly, the microprocessor determines mapping coordinates of the remote point based upon the angle of inclination data, the angle of bearing data, and the GPS coordinates of the observation point.

Abstract: The above measurement device acquires output data from a sensor unit for detecting surrounding feature, and extracts, from the output data, data corresponding to detection result in a predetermined range in a predetermined positional relation with an own position. The predetermined range is determined in accordance with accuracy of the own position. Then, the measurement device executes predetermined processing based on the extracted data.

Abstract: The invention concerns a system (100) and a method for estimating the geographic position of a target (1). The method comprises the following steps: detecting a target (1); determining the characteristics of the target (1), which characteristics at least comprise a geographic position (3) and a category of the target; tracking the detected target (1) until at least one certain predetermined criteria is not fulfilled, wherein said criteria is associated to the level of certainty for determining the geographic position (3) of the target (1).

Abstract: A method for navigating a ship through seas with ice includes: determining a route of the ship through a portion of a sea starting from a departure location and ending at an arrival location; rendering a digital ice layer of the portion of the sea using at least one satellite captured image; overlaying the digital ice layer on a geographical map of the portion of the sea, thereby generating an overlaid geographical map; mapping a plurality of waypoints using the overlaid geographical map, wherein the plurality of waypoints navigate around ice of the digital ice layer along the route; transmitting coordinates of the plurality of waypoints to the ship; and piloting the ship along the route from the departure location to each of the plurality of waypoints and to the arrival location.

Abstract: The invention relates to a method for determining a heading, in which a magnetic field is measured by at least one magnetometer and a magnetic heading is determined from said measurement and in which calculation means implement a processing calculating, for each measurement of magnetic heading, a value for characterising the heading thereby determined, characterised in that said characterisation value is a monotone function of a norm of the measured magnetic field gradient, said value being used in the determination of the heading.

Abstract: The present invention relates to a method for estimating the movement of an object (1) moving in an environment (?) and an ambient magnetic field, the method being characterised in that it includes the steps of: (a) Acquisition: by inertial measurement means (24) fixed with respect to said object (1), of at least one component of an acceleration and/or an angular velocity of the object (1), designated inertial datum; by magnetic measurement means (20) fixed with respect to said object (1), of at least one component of the magnetic field and/or an i-th derivative of the magnetic field, at the magnetic measurement means (20), designated magnetic datum; by optical acquisition means (26) fixed with respect to said object (1), of consecutive images of the environment (?), designated vision datum; (b) Estimation by the data processing means (21, 31, 41) of at least one component of the movement of said object (1) using the inertial datum, as well as the magnetic datum and/or the vision datum.

Abstract: Systems and methods for use in aiding an inertial navigation system during a GNSS signal outage. An ultrasonic transceiver is positioned adjacent a wheel of a vehicle and reflections of the emitted signal are used to determine changes of direction and/or to determine a distance traveled by the vehicle. For changes of direction, the transceiver is adjacent to a front wheel such that left or right turns cause the wheel to interrupt a signal path from the transceiver to a reflector. For distance estimates, the transceiver is adjacent a back wheel of the vehicle. The ultrasonic signal is reflected off of solid sections of the wheel or passes through void sections of the wheel. The measurements obtained can be processed in various ways to estimate number of rotations of the wheel and, accordingly, the distance traveled by the vehicle.