63results 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.

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 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.

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 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.

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 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.

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.

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.