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151 results about "Relative bearing" patented technology
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In nautical navigation the relative bearing of an object is the clockwise angle from the heading of the vessel to a straight line drawn from the observation station on the vessel to the object. The relative bearing is measured with a pelorus or other optical and electronic aids to navigation such as a periscope, sonar system, and radar systems. Since World War II, relative bearings of such diverse point sources have been and are calibrated carefully to one another. The United States Navy operates a special range off Puerto Rico and another on the west coast to perform such systems integration. Relative bearings then serve as the baseline data for converting relative directional data into true bearings (N-S-E-W, relative to the Earth's true geography). By contrast, Compass bearings have a varying error factor at differing locations about the globe, and are less reliable than the compensated or true bearings.
Proximity measuring apparatus
InactiveUS6614387B1Reduced risk of collisionAnti-collision systemsCode division multiplexMeasurement deviceSignature Code
A proximity measuring apparatus (70) comprises an interrogator (80) for generating an interrogation signal encoded with a reference signature code comprising concatenated codes and emitting it as interrogating radiation. It also incorporates a transponder (90) for receiving the interrogating radiation, demodulating it to extract its signature code and then remodulating it after a delay period to provide a signal for reemission as return radiation therefrom. The interrogator (80) receives return radiation at its antenna (260) and demodulates it to extract its signature code and then correlates the code with the reference code to determine mutual correlation thereof. The interrogator (80) incorporates a computer (290) for controlling a scan direction of the antenna (260) and for measuring time delay between emission of the interrogating radiation therefrom and receipt of corresponding return radiation. The computer (290) computes distance and relative bearing of a transponder (90) providing the return radiation from the scan direction and the time delay. The apparatus (70) may be used for improving road vehicle safety.
Owner:QINETIQ LTD
Method for characterizing a subsurface formation with a logging instrument disposed in a borehole penetrating the formation
ActiveUS7202670B2Improve accuracyReduce dependenceElectric/magnetic detection for well-loggingRulers for direct readingAzimuth directionRelative bearing
Owner:SCHLUMBERGER TECH CORP
Flight display system with enhanced temporal depiction of navigation information
ActiveUS7765061B1Instruments for road network navigationRoad vehicles traffic controlJet aeroplaneLow speed
In one aspect, the flight display system comprises a navigation map that includes a time window for a required time of arrival (RTA) waypoint. The time window has a proximal end indicating the aircraft's position at the RTA using a defined lowest speed and a distal end indicating the aircraft's position at the RTA using a defined highest speed. In another aspect, a pop-up time map displays flight plan waypoints mapped out along a time line adjacent to a plurality of time markers. The waypoint scrolls along the time line during flight. In another aspect, the flight display system includes a full format time map for displaying at least one flight plan waypoint mapped out along a time line adjacent to a plurality of time markers. In another broad aspect, a time / bearing map includes a plurality of concentric “range” rings corresponding to selected times in the future; a plurality of radially spaced bearing ticks positioned at selected locations about the concentric rings; and, a relative time ring presentable about a central axis of, and internal to, the concentric rings. The relative time ring represents a fixed increment in time. Selected waypoints are presentable at their relative bearing to the airplane and at their range (in time) from the airplane.
Owner:ROCKWELL COLLINS INC
Calibration of a surveying instrument
ActiveCN1894557AAccurate CalibrationQuick calibrationSurveying instrumentsTheodolitesOptical propertySurvey instrument
A method for calibrating a surveying instrument is disclosed the survey instrument comprising a base element (3) and a camera with an image sensor (10), the camera being rotatable about a vertical axis (2) fixed with respect to said base element and being rotatable about a tilting axis (4), the tilting axis being rotated about the vertical axis with rotation of the camera about the vertical axis, In the method, data associated with calibration points (P) and images (P1) of the calibration points on the image sensor captured in different faces are used, the data for each of said calibration points comprising distance data and the data for each of the images of each said calibration point comprising image position data and orientation data. Further, on the basis of the distance data for each of the calibration points and the image position and orientation data for each of the images of the calibration points the surveying instrument is calibrated simultaneously taking into account at least one optical property of camera and at least one of the relative orientation of the vertical axis and the tilting axis and the orientation of the camera relative to one of the base element, the vertical axis and the tilting axis.
Owner:TRIMBLE JENA
Relative orientation angle calculation method and device as well as relative positioning method
ActiveUS9772396B2Position fixationNavigation by speed/acceleration measurementsMobile deviceRelative bearing
Disclosed is a relative orientation angle calculation method comprising steps of obtaining inertial sensor data of first and second mobile devices, the first mobile device being capable of sending a first signal to the second mobile device; obtaining a sending frequency that the first signal has when the first mobile device sends the first signal to the second mobile device; obtaining a receipt frequency that the first signal has when the second mobile device receives the first signal sent from the first mobile device, the first signal receiving influence of the Doppler effect in a sending process in which the first signal is sent to the second mobile device from the first mobile device; and calculating, based on the inertial sensor data, the sending frequency, and the receipt frequency, a relative orientation angle between the first and second mobile devices.
Owner:RICOH KK
Automatic collimation measurement system, collimation method and measurement method for spacecraft devices
ActiveCN107543495ARealize automatic levelingExcellent leveling accuracyUsing optical meansTheodolitesTheodoliteAutocollimation
The invention discloses a collimation measurement system for attitudes and angles among spacecraft devices based on the combination between a robot and a theodolite. The system herein includes a robot, a laser tracker, a laser tracking target (T-MAC), a robot terminal tool, and the like. The system searches a to-be-tested datum cube mirror which is disposed on a spacecraft device by conducting mode identification, and computes the relations of phase position and direction of the datum cube mirror with respect to the theodolite. The laser tracker is intended for calibrating the relative direction relation in a coordinate system of respective spacecraft devices and integrating the measurement results of the theodolite at different measurement positions to the same coordinate system. Based onthe calibration relation and the relative relation, the laser tracker is guided to real-timely track the robot terminal tool and establish the relative relation between the laser track and the robotterminal tool. And eventually, the attitude relation matrix of the spacecraft is computed. According to the invention, the automatic measurement of the attitude relation among different devices is realized, the measurement efficiency can reach one time per half-minute, the measurement precision can be higher than 30'', on-site measurement flexibility is higher, and construction and measurement indifferent places can be much easier.
Owner:BEIJING INST OF SPACECRAFT ENVIRONMENT ENG
Physical Therapy Apparatus for Self-Administered Soft Tissue Manipulation
InactiveUS20080200853A1Promote healingPrevent consequencesMassage combsMassage beltsTherapeutic effectNeck of pancreas
An apparatus for performing soft-tissue manipulation of a user's spinal discs, and other back, neck and glutei soft-tissues includes a rigid or semi-rigid working member having at least one operational side surface for engaging contact with target soft-tissues and to which are secured a pair of straps. The operational side surface is provided with design form features configured to produce a therapeutic effect on the target soft-tissues when in contact therewith, and which may include recesses, projections or other protuberances. The working member and straps have an overall longitudinal length selected to enable the apparatus to be positioned partially encircling a user's body with the straps secured to a support. The length enables the user to stand or sit in a rearward inclined position, leaning backwardly to effect relative bearing contact between the target soft-tissues and the operational surface of the working member.
Owner:TIELVE FRANK
Distributed and cable reduced tcas
ActiveUS20080068250A1Less cablesDirection findersRadio wave reradiation/reflectionEngineeringHandling system
A direction finding antenna system for determining the relative bearing of a second aircraft from a first aircraft in conjunction with a Traffic Alert Collision Avoidance System (TCAS). The system includes a first antenna and a second antenna located on a top surface of the first aircraft, spaced apart along a first axis, as well as a third antenna and a fourth antenna located on a bottom surface of the first aircraft, spaced apart along a second axis orthogonal to the first axis. The system further includes a transmitting, receiving, and processing system coupled to the first, second, third, and fourth antennas, wherein the transmitting, receiving, and processing system is configured to transmit TCAS interrogations, receive TCAS replies, and process the TCAS replies to determine the relative bearing of the second aircraft from the first aircraft.
Owner:HONEYWELL INT INC
Electromagnetic distance measurement guide system for double solenoid set during drilling
InactiveCN101852078AEasy to change intensityHigh precisionSurveyConstructionsHorizontal wellsData transmission time
The invention discloses an electromagnetic distance measurement guide system for a double solenoid set during drilling. The system can provide accurate guide measurement and calculation for well track control of double horizontal wells, communicated wells, U-shaped wells, infill wells, and other complex-structure wells. The system mainly comprises a double solenoid set pup joint, a converted MWD,a ground display system, ground equipment, and the like. The double solenoid set pup joint serving as a magnetic signal emission source is put into a drilled well, two rotating magnetic fields with different frequencies are generated, and the system has the measurement accuracy equivalent to the RMRS. During measurement and calculation, the spacing between adjacent wells and relative azimuth can be accurately detected and calculated without dragging the double solenoid set pup joint. Therefore, the measurement can be finished in short time. The data analysis and adjacent well spacing calculation program of the system can be put underground, only a little of calculated necessary data is transmitted to the ground, and the data transmission time is saved. Meanwhile, by improving the current intensity of a solenoid coil, and the like, the intensity of the magnetic signal emission source is improved, and the distance measurement range of the system is easily increased. The system has the advantages of high guide accuracy, wide distance measurement range, short measurement time, and simple structure, and is an effective high-tech means for the detection and control of the distance between the adjacent wells during drilling.
Owner:CHINA UNIV OF PETROLEUM (BEIJING)
Anti-jamming array antenna
InactiveUS6124828AReduce processing loadRadio wave direction/deviation determination systemsCommunication jammingAnti jammingPhase shifted
This array antenna with anti-jamming in reception for radioelectrical or ultrasound waves is provided with radiating elements fitted out individually or in groups with amplitude-controlled and phase-controlled passive or active modules enabling aiming at transmission as well as at reception by analog beam-forming. It possesses a reception anti-jamming circuit carrying out successively two reduced, adaptive computational beam-forming operations, one in elevation which is performed on a grouping, in horizontal alignments, of the reception signals of the radiating elements and working on the reception signals by modifying the settings of the controlled modules and the other in relative bearing, performed on a grouping, in vertical alignments, of the signals of the radiating elements that which it phase-shifts and adds up to form a reception channel for the total antenna. The reception anti-jamming thus obtained has performance characteristics comparable to those that would result from a full adaptive beam-forming operation. At the same time, it requires a far smaller volume of processing.
Owner:THOMSON CSF SA
Method of steering smart antennas
The invention includes a method of communicating in a network of multiple nodes transmitting and receiving messages to and from each other. The method includes (a) scanning in synchronism a receive directional beam of an antenna of a first node and a receive directional beam of an antenna of a second node; (b) steering, in azimuth, a transmit directional beam of an antenna of the first node to a relative bearing of the second node; and (c) transmitting a message from the first node to the second node, when the transmit directional beam of the first node and the receive directional of the second node are substantially aligned in relative bearing to each other.
Owner:HARRIS GLOBAL COMM INC
Gyroscopic system for boresighting equipment
ActiveUS20050150121A1Surveying instrumentsSpeed measurement using gyroscopic effectsGyroscopeEngineering
A gyroscopic system for translating parallel and non-parallel lines between a reference line and a device to be aligned with respect to the reference line is provided. The system includes a first inertial sensor configured to be substantially stationary, the first inertial sensor comprising a first three-axis gyroscopic sensor configured to produce an output signal and a reflector. A second inertial sensor is configured to be portable so as to be positionable adjacent to the first inertial sensor and comprises a gimbal restricted to two physical axes, a gimbal drive system, an electromagnetic energy beam generator, a second three-axis gyroscopic sensor configured to generate an output signal, and a collimator. The collimator is operable to determine an angle between a beam projected by the beam generator and a beam reflected from the reflector and to generate an output signal indicative of the determined angle. A control circuit is operable to process output signals generated by the collimator and the first and second three-axis gyroscopic sensors and determine relative orientations of the first and second inertial sensors with respect to each other.
Owner:AIRPORTS AUTHORITY OF INDIA
Information processing method and system
InactiveUS20050253871A1Easily and correctly obtainsImage analysisPosition fixationInformation processingImage detection
An information-processing system for calibrating an orientation sensor mounted on an image-pickup device calculates a relative orientation between the orientation sensor and the image-pickup device by using information about image coordinates of indices detected from a photographed image and an orientation-measurement value. At the same time, the information-processing system obtains parameters for minimizing an error between actual measured values of the image coordinates of the indices and theoretical values of the image coordinates of the indices, where the theoretical values are calculated from estimates of unknown parameters, by using a position of the image-pickup device and the relative orientation between the orientation sensor and the image-pickup device, as the unknown parameters.
Owner:CANON KK
Automatic unit based self organizing and controlling method for urban traffic signals
InactiveCN1472710ASimple information processingOptimize traffic operating environmentControlling traffic signalsDetection of traffic movementTraffic signalOrganizational control
The method treats city traffic signal control system as traffic network as each crossing is an agent which has function of information self-collecting and self-processing. The system can realize dynamic decision for traffic signal control at each crossing by relying on network self-organization. The attribute matrix is used to express state information for local and adjacent crossing with using relative bearing for connected crossing. The system is established to be virtual network model with cellular automara features so the self-organized control for traffic signal can be realized by carrying on dynamic migration of crossing signal state under control rule driving.
Owner:SHANGHAI JIAO TONG UNIV
Prefabricated tube pile embankment structure and construction method thereof
InactiveCN103774514AReduce settlementEnsure stabilityRoadwaysProtective foundationReinforced concreteSlag
The invention relates to a prefabricated tube pile embankment structure, which mainly comprises a prefabricated tube pile, a vertical drain tube, a shallow curing plate, a thin reinforcement concrete continuous plate, a rubble layer, a bubble concrete rolling-resistant layer, a concrete protection layer, a slag layer and a pavement structure, wherein the prefabricated tube pile penetrates through a soft soil layer and extends a relative bearing stratum; a weld seam protection device is arranged outside a prefabricated tube pile welding end plate; the shallow curing plate is arranged at the periphery of the top of the prefabricated tube pile; the thin reinforcement concrete continuous plate is arranged on the shallow curing plate; the top of the prefabricated tube pile is embedded in the thin reinforcement concrete continuous plate; the vertical drain tubes are pre-buried in the thin reinforcement concrete continuous plate and the shallow curing plate, the lower ends of the vertical drain tubes are externally coated with a reverse filter geotextile which is communicated with the rubber layer on the thin reinforcement concrete continuous plate; the bubble concrete rolling-resistant layer, the slag layer and the pavement structure are sequentially arranged on the rubble layer. The prefabricated tube pile embankment structure is high in bearing capacity, less in differential settlement, high in overall structure stability, and convenient to construct.
Owner:JIANGSU ZHONGRUI ROAD & BRIDGE CONSTR
Azimuthal binning of density and porosity data
A logging-while-drilling density sensor includes a gamma ray source and at least two NaI detectors spaced apart from the source for determining measurements indicative of the formation density. A magnetometer on the drill collar measures the relative azimuth of the NaI detectors. Measurements made by the detectors are partitioned into bins defined by azimuth. A compensated bulk density is determined for selected ones of said azimuthal sectors that meet a threshold test related to a minimum difference of measurements or a minimum correction. The method of the invention may also be used with neutron porosity logging devices.
Owner:BAKER HUGHES INC
Distributed and Cable reduced TCAS
A direction finding antenna system for determining the relative bearing of a second aircraft from a first aircraft in conjunction with a Traffic Alert Collision Avoidance System (TCAS). The system includes a first antenna and a second antenna located on a top surface of the first aircraft, spaced apart along a first axis, as well as a third antenna and a fourth antenna located on a bottom surface of the first aircraft, spaced apart along a second axis orthogonal to the first axis. The system further includes a transmitting, receiving, and processing system coupled to the first, second, third, and fourth antennas, wherein the transmitting, receiving, and processing system is configured to transmit TCAS interrogations, receive TCAS replies, and process the TCAS replies to determine the relative bearing of the second aircraft from the first aircraft.
Owner:HONEYWELL INT INC
Method and system for navigation of movable platform
A method for navigation of a movable platform is provided. The method includes the steps. First, a plurality of reflection devices is placed to mark a range. A coordinate location and a direction of the movable platform are received by a positioning system, At least one laser to measure relative positions and distances between the reflection devices and the movable platform are emitted by a laser range finder, respectively. Absolute locations of the reflection devices and the range are calculated by a processor according to the coordinate location and the direction of the movable platform, the relative positions and the distances between the reflection devices and the movable platform. The reflection devices are scanned and tracked by the processor, and the coordinate location and the direction of the movable platform and the absolute locations are calibrated by the processor to control the movable platform to move in the range.
Owner:IND TECH RES INST
Defect detection system
InactiveUS6862096B2Easy to detectReduce crosstalkPhotometry using reference valuePolarisation-affecting propertiesScanning probe microscopyOptical polarization
Owner:KLA CORP
Alternating magnetic field guiding device
ActiveCN101915061AMeet the positioning needsPrecise distance controlDirectional drillingAutomatic control for drillingLoop controlMagnetic poles
The invention discloses an alternating magnetic field guiding device. The alternating magnetic field guiding device comprises a near-bit manual magnetic pole module, a destination module and a source control module, wherein the near-bit manual magnetic pole module transmits a low-frequency alternating magnetic field signal; the destination module acquires the low-frequency alternating magnetic field signal and calculates the relative azimuth and distance between a bit and a destination target point; the information of the relative azimuth and distance is transmitted to a driller indication control unit of the source control module by a remote transmission unit; and the driller indication control unit adjusts the drilling direction of the bit in real time according to the received information of the relative azimuth and distance between the bit and the destination target point, so the bit is controlled to accurately drill toward the destination target point. The alternating magnetic field guiding device breaks through the conventional open-loop control mode depending on the measurement result of the near-bit azimuth angle of the source, and improves the accuracy of controlling the bit to drill toward the destination target point in real time by measuring the information of the relative azimuth and distance between the bit and the destination target point and taking the relative azimuth and distance between the bit and the destination target point as the closed-loop control parameters.
Owner:BEIHANG UNIV
Model-based relative bearing estimation of three-component receivers
A method is disclosed for more accurately determining the relative bearing angle of a directional receiver in a borehole using an existing three-dimensional (3D) geological model, one or more seismic sources and a three component (3C) directional receiver. A disclosed method includes: receiving direct compressional arrivals generated by multiple source events at the directional receiver disposed in the borehole; rotating the seismic data into the true earth frame using an estimated relative bearing angle; measuring a polarization vector of the rotated seismic data; estimating an incident ray vector of the direct compressional arrivals at the directional receiver using ray-tracing through the 3D model; calculating the weighted sum of an angular difference between the polarization vector and the incident ray vector; and adjusting the estimated relative bearing angle until the angular difference between the polarization and incident ray vectors is minimized.
Owner:SCHLUMBERGER TECH CORP
Method, assembly and system for sensing mainframe movement
InactiveCN104020846AImprove accuracyImprove applicabilityInput/output for user-computer interactionGraph readingRelative displacementExternal application
The invention belongs to the technical field of movement sensing obtaining and the technical field of human-computer interaction and provides a method, assembly and system for sensing mainframe movement. The method includes the steps that three-axis coordinates and finger data of fingers collected by assemblies for sensing finger movement in real time are obtained; mainframe movement sensing assembly data collected by the assembly for sensing mainframe movement in real time are obtained; the collected finger data are compared with the mainframe movement sensing assembly data and the relative azimuth angle, relative acceleration, relative speed and relative displacement between the assemblies for sensing finger movement and the assembly for sensing mainframe movement are generated; according to user body correction data established in advance, a correction mode and relative displacement, the three-axis coordinates of each finger are corrected; the corrected three-axis coordinates of each finger, relative acceleration, relative speed and relative displacement are sent to an external application terminal. According to the method, assemblies and system for sensing mainframe movement, accuracy and applicability of a following analysis result are improved.
Owner:NOVUS TECH
Stage follow spotlight control method based on image identification
InactiveCN106954325ASolve problems such as inaccurate positioning and easy interferenceEasy to controlElectrical apparatusElectric light circuit arrangementLight spotComputer graphics (images)
The present invention discloses a stage follow spotlight control method based on image identification. The method comprises the following steps: 1) collecting images and infrared images of a current stage downward angle in real time; 2) processing the images and the infrared images, and forming approximate ellipse extraction characteristic points according to light spots of a spotlight; 3) calculating position where a center point is located according to the identified ellipse extraction characteristic points; 4) taking the position of the center point as a center of circle, allowing the size of the radius to be 20-25 centimetres, determining an ellipse center area, and calculating the ratio of the superposed portion of the top view shadow area formed by performers and the ellipse center area according to the infrared images so as to determine whether the ellipse center area is shielded or not; and 5) if the ellipse center area is not shielded, moving the spotlight according to the relative direction of the ellipse center area and the performers to allow the performers to be located at the center area of the ellipse. The stage follow spotlight control method based on the image identification solve the problems that a current stage follow spotlight control system is not accurate in location and easy to be disturbed so as to reach the purpose of rapidly and conveniently controlling a follow spotlight.
Owner:WUHAN UNIV OF TECH
Space electromagnetic intensity distribution analysis method
The invention discloses a space electromagnetic intensity distribution analysis method, which comprises the following steps of: 1, determining an observation and test space region according to space electromagnetic intensity analysis requirements, and meshing the region, wherein a test point in subsequent steps can be selected from mesh regions; 2, calculating a relative distance and a relative direction between the point and each piece of equipment according to the position of the test point; 3, calculating a time-domain signal of the test point according to a formula for a composite signal by utilizing calculation results obtained by the step 2; 4, performing Fourier transform on the time-domain composite signal obtained by the step 3 to obtain the frequency-domain energy distribution of the space composite signal at the test point; and 5, repeating the steps 2 to 4 for the whole observation and test region to obtain the composite electromagnetic radiation intensity data of a space radiation source of the observation and test region. According to the method, the distribution of the space electromagnetic intensity can be analyzed more accurately and efficiently.
Owner:XIDIAN UNIV
Single-center projection transformation method of multi-lens and multi-detector aerial camera
ActiveCN106643669AExcellent splicing accuracyGeometric image transformationPicture interpretationAviationCamera lens
The invention provides a single-center projection transformation method of a multi-lens and multi-detector aerial camera. The single-center projection transformation method comprises the following steps: 1) establishing a virtual image space coordinate system with uniform standards; 2) establishing a mathematical model for reflecting a related position relation between multi-lens cameras and a related position relation between a plurality of detectors; 3) solving combined position elements and distortion parameters of a plurality of lenses and the plurality of detectors through static geometric calibration; 4) establishing a mathematical mode for related position changes of images of the plurality of detectors in a dynamic flight process; 5) obtaining identical points of overlapped regions of the images of the plurality of detectors through rapid matching of short-baseline images; 6) establishing a self-calibration error equation according to an identical points coordinate error minimum principle; 7) carrying out a point-by-point method and finishing iterative solution according to a least squares adjustment principle, so as to obtain accurate related position element in the dynamic flight process. The method provided by the invention is universally applicable to generation of equivalent single-center projection virtual images of a multi-lens and multi-detector area array splicing type aerial mapping camera.
Owner:BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH
Device orientation determination
In some embodiments, apparatus and systems, as well as methods, may operate to obtain hole azimuth data or inclination data associated with a chassis (e.g., comprising a measurement or logging tool) in a borehole using interpolated data or survey data, and to determine magnetic field orientation of the chassis using a portion of the hole azimuth data, a portion of the inclination data, relative bearing data, and Earth magnetic field orientation data by reconstructing at least a portion of borehole magnetic field data that is corrupt or missing. Additional apparatus, systems, and methods are disclosed.
Owner:HALLIBURTON ENERGY SERVICES INC
Robot tracking method and system
The invention discloses a robot tracking method. The method comprises the steps that a target robot transmits an optical signal; a tracking robot receives the optical signal, and the relative azimuth of the target robot relative to the tracking robot is confirmed; and distance measurement is performed by the tracking robot by utilizing ultrasonic wave according to the relative azimuth so that distance between the tracking robot and the target robot is obtained, and the tracking robot moves to the target robot till the preset distance is reached. The invention also correspondingly discloses a robot tracking system. With application of the technical scheme, cost of realization of locating and tracking can be reduced in application occasions of robot teaching and performance.
Owner:嘉兴云切在线科技有限公司
Active alternating magnetic field information-based method for guiding and positioning well drilling track
ActiveCN101929310AAvoid error accumulationSolve the problem of feature signal extractionDirectional drillingAutomatic control for drillingWell drillingRelative bearing
The invention discloses an active alternating magnetic field information-based method for guiding and positioning a well drilling track. The method comprises the following steps of: 1, acquiring an in-phase reference component I and an orthogonal reference component Q through a near-bit magnetic field signal; 2, acquiring a characteristic signal HIQ of an elliptical polarizing magnetic field at a target point; 3, acquiring a relative azimuth between a drill bit and the target point; 4, acquiring a relative distance between the drill bit and the target point; and 5, controlling the drill bit to drill accurately towards the target point through the relative azimuth and the relative distance between the drill bit and the target point. The method has the advantages of breaking through a method for separately measuring a near-bit coordinate and a target point coordinate in the conventional geometric guide technology, directly linking a near bit with the target point through a low-frequency alternating magnetic field, directly measuring the relative position relation of the drill bit and the target point, avoiding error accumulation in the conventional geometric guide technology and guiding the drill bit to drill from an end of the target point.
Owner:BEIHANG UNIV
Directional sound source control device and method for video surveillance
ActiveCN105338292AImprove accuracySuppression of accuracy errorsPosition fixationClosed circuit television systemsVideo monitoringSound sources
The invention discloses a directional sound source control device and method for video surveillance. In the directional sound source control device disclosed by the invention, a sound pickup component can synchronously rotate with a camera, so that a dynamic sound source coordinate system capable of synchronously rotating with the camera can be formed, correspondingly, based on the dynamic sound source coordinate system, a calculated azimuth angle is a relative azimuth angle of a sound source relative to a lens normal of the camera, and then, the relative azimuth angle is converged within a preset angle range to achieve closed-loop control of the relative azimuth angle, and a lens visual angle range of the camera traces the direction of the sound source by means of the closed-loop control of the relative azimuth angle. Since a loop gain generated by the closed-loop control of the relative azimuth angle can inhibit a precision error generated by an azimuth angle solution algorithm, the directional sound source control device and method disclosed by the invention can be used for improving the directional accuracy without improving the accuracy of the solution algorithm, so that resources consumed for operating the algorithm can be saved.
Owner:HANGZHOU HIKVISION DIGITAL TECH
Displaying object orientations on ball joints
InactiveUS20080027312A1Surgical navigation systemsComputer-aided planning/modellingGraphicsJoint cavity
A method for displaying, in the field of medical technology, an orientation of an object on a ball joint, includes: defining a zero angle projecting out of a joint cavity on the ball joint, wherein directions are defined as anatomical directions; defining a preferred direction of the object, wherein the preferred direction is to be oriented in relation to the zero angle; and graphically displaying the object orientation, wherein a deviation between the preferred direction and the zero angle is displayed as a magnitude, and the relative orientation between the preferred direction and at least one anatomical direction is displayed as a circumferential representation having a proportional value corresponding to the at least one anatomical direction.
Owner:BRAINLAB
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