64results about How to "Improve position measurement accuracy" patented technology

A position measurement system includes a first position measurement unit configured to measure a position of an object in a first and a second direction, the first position measurement unit including a first sensor and a first grating that extends in a first direction, a second position measurement unit configured to measure the position of the object in the first and the second direction, the second position measurement unit including a second sensor and a second grating that extends in the first direction. The position measurement system is configured to initialize the second position measurement unit based on a position measurement of the first position measurement unit.

A position measurement system for measuring a position of an object is described, the system including: a first incremental measurement unit for measuring a first number of first distance steps in a distance between a reference frame and the object, wherein the first number equals a first integer value plus a first fraction, and a second incremental measurement unit for measuring a second number of second distance steps in a distance between the reference frame and the object, wherein the second number equals a second integer value plus a second fraction, wherein the position measurement system is constructed and arranged to initialize the second incremental measurement unit on the basis of the first number and the second fraction.

The invention discloses a bulb lamp sorting and packing system based on machine vision. The system comprises a working platform; the working platform is provided with a robot module, a visual system module and a workpiece platform module; the robot module includes a six-axle robot, a mechanical jaw and a PLC control box; the mechanical jaw is mounted on a rotating manipulator at the end part of the six-axle robot; the workpiece platform module includes a shooting area platform, a detecting platform, a finished product box and a defective product box; the visual system module includes a 2D camera, light sources, an industrial controller all-in-one machine and a visual software system; the 2D camera is fixed on the mechanical jaw through a bracket; and multiple light sources are uniformly distributed around a shooting area. The bulb lamp sorting and packing system based on machine vision is simple in structure, high in integration degree, convenient for installation, fast in sorting speed, high in efficiency, low in cost and excellent in safety, and effectively realizes sorting and packing of bulb lamps based on machine vision.

The invention relates to a non-cooperative target relative navigation motion estimation method and system based on multi-source information fusion. The method comprises the following steps of: givinga joint calibration method of a laser and visual measurement system, obtaining the reprojection information of a laser scanning point cloud in camera coordinate system based on the joint calibration system, respectively acquiring the depth compensation information of the target point and the compensated depth information by using a quadratic interpolation method, realizing information fusion between the laser scanning point cloud and the vision camera image, and finally acquiring the motion estimation of the target on the basis of the fusion information. The method provides a fusion method ofinformation of a vision camera and a laser scanner. The high precision depth information of the laser scanning point cloud can be used to compensate for the poor accuracy of the visual image in the depth direction, meanwhile, the defect of low resolution of laser scanning is avoided and the high precision of laser scanning depth information and high image resolution of visual measurement system are integrated. Meanwhile, the interpolation calculation method of information fusion is a simple algebraic operation, which is easy for engineering realization and application.

The invention provides a ground testing system for the active vibration abatement of a flexible spacecraft, which comprises a marble air-floating platform, a flexible spacecraft motion simulator suspending above the marble air-floating platform, a rate gyroscope, a photoelectric type attitude sensor, a vibration measuring system, an attitude control flywheel, an attitude control thruster, an orbit control thruster, a vibration abatement system, a motion simulator control computer, a ground measurement system and a ground console. The rate gyroscope, the photoelectric type attitude sensor, the vibration measuring system, the attitude control flywheel, the attitude control thruster, the orbit control thruster and the vibration abatement system are mounted on the flexible spacecraft motion simulator. The motion simulator control computer is mounted on the flexible spacecraft motion simulator and is electrically connected with the rate gyroscope, the vibration measuring system, the attitude control flywheel, the attitude control thruster, the orbit control thruster and the vibration abatement system. The ground measurement system is arranged on the marble air-floating platform and the flexible spacecraft motion simulator. The ground console is connected with the photoelectric type attitude sensor, the motion simulator control computer and the ground measurement system. According to the technical scheme of the invention, the defect that the flexible vibration characteristics of flexible spacecrafts are hard to simulate can be overcome. Therefore, the attitude determination accuracy of the flexible spacecraft motion simulator can be improved.

The invention discloses a measuring method of an airborne single-station passive positioning system on a measure target radiation wavelength. The measuring method comprises the following steps: making an airborne single-station passive probing platform do constant motion along a straight line; firstly, using the receiving front end to process received probing signals; then, sending the received probing signals into a digital signal processing unit; sending signal frequency values obtained through regular detection under the control of a synchronous clock into a memory; and calling the latest three frequency values from the memory by the data processing unit in a mode of automatic or manual commands under the triggering effect of the regular synchronous clock to measure the wavelength of the measured signals. The invention can accurately estimate and obtain the wavelength of the measure target radiation signals through the simple frequency measuring technology, and the measuring method can be applied to the execution of long distance positioning measuring tasks. However, an aerial measuring platform which has simple equipment and can not be supported by a ground measuring system can also be applicable to the monitoring management of aerial radio signals.

The invention provides a positioning method and a positioning device. The positioning device applied to a base station side comprises the following steps: acquiring the positioning measurement information of a terminal; receiving a positioning measurement request triggered by a preset positioning entity, wherein the positioning measurement request contains an indication for positioning and measuring the terminal by virtue of a coverage enhancement grade; and sending positioning measurement information of the terminal to the preset positioning entity according to the positioning measurement request so as to drive the preset positioning entity to position the terminal according to the positioning measurement information. According to the embodiment of the invention, the terminal is roughly positioned by a network side through the coverage enhancement grade and a service cell marker of the terminal, so that the extra expenditure of the terminal caused by the positioning of the terminal in the coverage enhancement grade range is avoided, the complexity of the terminal is reduced, and the power consumption of the terminal is saved; or the terminal is subjected to positioning measurement by the network side through a repeated sending property of the coverage enhancement grade, so that a relatively accurate positioning measurement result is obtained, and the positioning measurement precision is improved.

The invention discloses a model-free self-adaptive control method for an attitude of an assembled spacecraft. The method comprises the following steps: S1) establishing a full-format dynamic equivalent linear data model for an attitude movement of a general assembled spacecraft; S2) designing a parameter self-adaptive estimating equation and estimating a pseudo gradient for the pseudo gradient in the full-format dynamic equivalent linear data model; and S3) establishing an error criterion function according to the dynamic equivalent linear data model, and designing a weighting one-step forward controller through a minimizing error criterion function. The dynamic equivalent linear model is established for a general discrete time nonlinear system, and a modified projection algorithm is adopted for performing online parameter estimation for the unknown variable in the dynamic equivalent linear model, so that the attitude determination accuracy of a flexible spacecraft movement simulator is increased.

The invention discloses an unmanned aerial vehicle visual attitude and position resolving method based on image marking. The unmanned aerial vehicle visual attitude and position resolving method comprises the steps of collecting an aerial image video stream of an unmanned aerial vehicle, extracting a region of interest from an image, extracting angular point coordinates from the region of interest, solving a homography matrix, and solving a relative position and a relative attitude angle of the unmanned aerial vehicle based on an imaging principle. The problem of relatively long time of globally carrying out corner detection is considered, therefore, the retrieval circular ring area is used for carrying out angular point detection on the area in the circular ring; in this way, the calculation amount can be reduced, the operation time can be shortened, the real-time performance of pose determination can be improved, interference of miscellaneous points outside a circular ring can be avoided, the anti-interference capacity can be improved, meanwhile, the three rectangles are adopted, target angular points can be efficiently extracted, and the angular points can be conveniently markedand matched. According to the method, high course measurement precision and high position measurement precision can be kept for a long time, and the method is suitable for application occasions withhigh requirements for the relative position and attitude precision of the unmanned aerial vehicle when two moving carriers such as a landing carrier converge.

The invention provides a cadastral survey off-line data processing method. Errors are eliminated by sequentially carrying out data preprocessing on inertial survey unit data in field collected data; and the inertial survey unit data with eliminated errors are classified, and the classified data are processed by adopting kalman fixed-interval optimal smoothing, a pure strapdown algorithm and a reverse navigation algorithm respectively, so that various harmful error components in the inertial survey unit data are effectively filtered, and the high-precision positioning information of points to be surveyed in cadastral survey is acquired.

The invention relates to an integrated servo cylinder which is characterized in that a cavity along the length direction of the piston rod is arranged on a piston and a piston rod, a displacement sensor is arranged in the cavity, one end of the displacement sensor is connected with the inner lateral surface of an end cover, and the other end of the displacement sensor is connected with the upper end of the piston rod. According to the integrated servo cylinder, the displacement sensor is integrated in the oil cylinder, so that the integrated servo cylinder is small in volume, compact in structure, high in position measurement accuracy, capable of being integrated into a hydraulic control system in a modularized way, low in manufacturing cost, long in service life and convenient to install and use. In addition, as the internal parts of the displacement sensor adopt insulating oil which is isolated from the hydraulic oil, and the pressure is compensated by a compensating leather bag, the displacement sensor is stable in work and long in service life. The displacement sensor is arranged in the cavity on the piston and the piston rod, so that the working pushing force of the cylinder is not affected at all.

A method for measuring a position of a user terminal is provided. The method includes selecting one or more anchor nodes for measuring the position of the user terminal, selecting a relay terminal from neighboring terminals of the user terminal, each of the neighboring terminals securing a Line Of Sight (LOS) with the user terminal and having location information thereof, and measuring the position of the user terminal using the one or more anchor nodes and the relay terminal.

The invention relates to an eyedrop bottle sorting and casing system device through a parallel four-axis robot provided with a visual system. The device comprises a working platform. A robot module, avisual system module and a workpiece platform module are arranged on the working platform. The robot module comprises the four-axis parallel robot and a control cabinet. The workpiece platform modulecomprises a photographing zone platform, a conveying belt, a charging zone and a discharging zone. The visual system module comprises a 2D camera, a light source, a computer and a visual software system. Specific to different gestures of eyedrop bottles in a detection zone, grabbing of different types is conducted, and a robot gas claw grabs the eyedrops and then sorts and cases the eyedrops. Inthe advanced manufacturing industry, the machine visual precision can be improved, the working efficiency can be improved, and the production cost is reduced.

The invention discloses a manufacturing method of an integral linear motion positioning system based on a grating measuring technology. The method comprises the following steps: manufacturing of grating lines on a linear motion component: grinding and polishing the surface of the linear motion component, and then making a grating line structure on the surface of the linear motion component; coating of a grating line protection film: coating the surfaces of the grating lines with a layer of SiO2 protective film; manufacturing of a compact reflective grating reading head: composing a photoelectric conversion part with an LED (Light-Emitting Diode) light source and a grating sensor, and then composing a complete compact reflective grating reading head by a subdivision circuit part; assembling the grating reading head. When the integral linear motion positioning system disclosed by the invention is applied to a numerically-controlled machine tool and a measuring instrument, complex debugging loops during installation of the grating can be omitted, an Abbe error can be avoided effectively, measuring uncertainty is lowered, and the positioning and measuring accuracy of equipment is increased; the method has a wide market prospect and a high popularization and application value.

The invention relates to a flexible robot arm shape measuring method and system based on equivalent center point recognition. The flexible robot arm shape measuring method mainly comprises the steps of acquiring complete side images of arm sections of a flexible robot through a binocular camera fixed on a rigid robot; according to the arm sections respectively detected in the binocular images acquired by the binocular camera, identifying and fitting the contour of an arm lever, and solving image pixel coordinates of the centers of the corresponding arm sections; according to trigger information of man-machine interaction equipment, determining corresponding center points of the same arm section in the left and right ocular images; resolving the pose of the center of the arm lever corresponding to the pixel coordinates of the two center points of the binocular images in the coordinate system of the binocular camera; and through a kinematics algorithm, determining the current pose of the binocular camera relative to a rigid mechanical arm base, and according to the installation position relation of a rigid mechanical arm relative to the flexible robot, converting the solved pose into the pose of the center of the arm lever in the arm section in a flexible robot base coordinate system.

The invention provides a calibration method. The calibration method includes the following steps that: a calibration device moves indoor; the calibration device is composed of an inertial navigation device, a wireless signal transmitting and receiving device and a bogie; the inertial navigation device is used for measuring the current position information of the calibration device; the wireless signal transmitting and receiving device is used for wirelessly exchanging positioning signals with an in indoor positioning system; and the bogie moves indoors according to a preset line and traverses an indoor space. The calibration method of the invention has universality. With the calibration method adopted, a variety of different kinds of indoor positioning systems can be rapidly calibrated, so that the calibration cost of the indoor positioning systems can be significantly reduced.

The invention discloses a method for accurate fault location of a multi-type cable connection system. Firstly, measurement parameters are normalized. Then the data is grouped and compensation corrections are made. The maximum value of the data is found and whether a cable is faulty is determined by comparison. Through the hybrid data automatic analysis algorithm in the present invention, in the case of multiple cables, the data obtained from one measurement can be used to accurately identify which cable the data of each scanning point belongs to. After the data distribution is completed, eachgroup of data is corrected by using the cable parameters corresponding to the data of the group. Thereby accurate fault location and DTF Return Loss results are obtained. Through this new fault location algorithm, the cable position measurement accuracy is greatly improved.

An image position measuring apparatus is provided with a photographing unit, which includes an imaging element and / or a lens and measures the position of a reference mark formed on a work; and a correcting unit for correcting distortion of the imaging element and / or the lens. An exposure apparatus is provided with the image position measuring apparatus and an exposure unit which performs exposure to the work corresponding to the image data corrected based on the positional information of the reference mark photographed by the image position measuring apparatus. Influence of the distortion of the imaging element and the lens can be eliminated, and accuracy of measuring the position of the reference mark given to the work can be improved.

The invention discloses workbench equipment and a method for measuring vertical zero clearing error of a workbench. The workbench equipment comprises a projection objective lens, a main substrate, a workbench, a controller and at least two vertical measuring devices. Each vertical measuring device comprises a light emitter and a light receiver which are correspondingly arranged, and is arranged onone side, close to the workbench, of the main substrate; in a plane perpendicular to the main substrate, the light emitter and the light receiver which are correspondingly arranged are both arrangedon the same side of the immersion head of the projection objective; the light receivers receive measurement light emitted by the corresponding light emitters and reflected by the first measurement point or the second measurement point on the workbench; and the controller obtains the vertical zero clearing error of the workbench according to the vertical heights of the first measuring point and thesecond measuring point. The invention provides the workbench equipment and the method for measuring the vertical zero clearing error of the workbench, and aims to solve the problem that one set of interferometer system cannot cover the whole stroke of the workbench when the vertical zero clearing error is measured.

The invention discloses an automatic addressing and positioning control system and method for static-pressure traveling cranes and relates to the technical field of automatic control. The automatic addressing and positioning control system is used for solving the problems that in the prior art, positioning of crown blocks and traveling cranes is operated manually through labor, and consequently the phenomenon that positioning precision is poor and positioning difficulty is high are likely to happen. The automatic addressing and positioning control system for the static-pressure traveling cranes comprises an operation terminal, a programmable controller, an electric-hydraulic proportional amplifier, an electric-hydraulic proportional valve, a hydraulic motor, an executing mechanism and a position detection device. A laser range finder or a barcode locator or an encoder is used as a position detection element for the position detection device, and the position detection device is installed at the transmission tail end of the executing mechanism and can be directly connected with the programmable controller and used for feeding back the current position of the executing mechanism.

An ultrasonic sensor control method includes outputting a first sensing signal, comparing a voltage value of a first reflection signal corresponding to the first sensing signal with a predetermined reference voltage value, determining a conversion method of the first reflection signal according to a voltage value comparison result, converting the first reflection signal according to a determined conversion method, and detecting an object by comparing a converted first reflection signal with a predetermined reference reflection signal.

The invention provides a rotary transformer. The rotary transformer includes a stator, and the stator comprises a stator core, an input winding and an output winding, wherein the input winding and theoutput winding are wound on the stator core; the inner side wall of the stator core is provided with a plurality of stator grooves, and the stator grooves are distributed in the circumferential direction, and the two end faces of the stator core are enabled to be connected, so that stator teeth are formed between any two adjacent stator grooves, so as to perform the winding of the input winding and the output winding respectively. The rotary transformer also comprises a rotor, wherein the rotor includes a rotor core. An air gap is defined between the inner side wall of the stator iron core and the outer side wall of the rotor iron core; when the rotor rotates, the length delta of the air gap and the mechanical rotation angle theta of the rotor meet the sine function relation containing the third harmonic component in the circumferential direction, and periodic change is executed according to the function relation so as to define the appearance of the rotor iron core. According to thetechnical scheme, under the condition of the same maximum air gap and the same minimum air gap, the output signal amplitude and the position measurement precision of the rotary transformer can be improved.

Characters of the disclosed method are that omitting precondition of testing pre alignment of mask; scanning at least eight points of light intensities sampled at X, Y two perpendicular directions; numeric area of light intensity is setup between larger than 0% and less than 100%. The invention solves issue that precision of measuring position of light intensity detector is restricted by pre alignment of mask; raises precision of measured position of light intensity detector; simplifying testing procedure, and saving testing time so as to raise work efficiency.

The invention discloses a rod position measuring method and device based on nuclear power station control rod motion characteristics and a medium, relates to the field of nuclear power stations, and solves the problem that an existing control rod measuring device has an upper limit in measuring precision. An excitation power supply supplies power to a rod position detector; acquiring a measurementsignal from the rod position detector, including acquiring an induced voltage signal of a coil in the rod position detector; separating a fixed frequency signal and a low frequency disturbance signalin the measurement signal, and performing data processing by combining the fixed frequency signal and the low frequency disturbance signal to obtain the position information of the rod position detector and the position information of the control rod bundle. On the basis of not changing the existing structure of the rod position detector, the precision of nuclear power station control rod position measurement can be provided. The effect of the method can be achieved only by changing a signal processing method and increasing low-frequency interference signal processing caused by control rod movement.