288results about How to "Eliminate positioning errors" patented technology

The invention discloses an OCT eye fundus image data registration method, which comprises the following steps: at first, extracting retina edges of an OCT eye fundus image by virtue of a Canny edge detection method, and collecting the edges in a format of point cloud data; then, extracting characteristic points of the point cloud data by adopting a space grid division method; next, calculating a transformation matrix of point clouds to be registered to eliminate obvious position errors by virtue of an SVD (singular value decomposition) algorithm; finally, performing accurate registration by virtue of an improved iterative closest point algorithm, and applying an obtained rotation matrix and translation matrix to the original OCT eye fundus image to obtain a final result. When a dense point cloud with a relatively large volume of data is processed, the method has obvious advantages in terms of time complexity and registration accuracy. Under most conditions, the efficiency of a conventional iterative closest point algorithm is improved by 70 percent by the method, not only can the OCT eye fundus image be effectively registered and spliced, but also the accuracy of a large-vision eye fundus retina accuracy is ensured.

The disclosed dead reckoning and positioning method combines satellite positioning data and comprises: receiving GPS signal, while detecting continually the vehicle angle and velocity; according to effective satellite number and horizontal error and the latitude and longitude variable error, deciding the reliability of GPS data flow for accurate positioning. This invention has well autonomy and precision, and will play important role in future satellite navigation technique and vehicle drive record technique.

The invention relates to an electromagnetic-signal-time-inversion-based fault point positioning method for a transmission line. On the basis of an electromagnetic time inversion principle, a single observation point is set at any terminal in a power distribution network and a fault high-frequency transient signal within a limited period of time is measured and recorded; and time inverted sequenceprocessing is carried out on the measured signal, the processed signal is injected into a power distribution network simulation calculation model at an observation point, norm values at different guess positions in the power distribution network are calculated, and a fault position is determined by searching for a maximum peak value and a maximum energy root value. According to the method different form the traditional traveling wave determining method and impedance method, a power distribution network with a complex topological structure can be covered by one observation point without being affected by the fault impedance; and the excellent anti-noise performance is realized. The electromagnetic-signal-time-inversion-based fault point positioning method has the great practical value in fault positioning of the transmission line.

The invention discloses a space-borne SAR image target positioning method capable of eliminating ground elevation errors, comprising the following steps: (1) acquiring needed ephemeris parameters; (2) respectively calculating target slant-range parameters, Doppler parameters and state vectors of a satellite; (3) substituting the target slant-range parameters, the Doppler parameters and the state vectors in step (2) into a target positioning equations set, and then solving the equations set to obtain a ground target position; and (4) taking the x, y and z coordinates solved in step (3) as the coordinates under an inertial coordinate system, transforming the coordinates into a geocentric rotating coordinate system xc, yc and zc by a coordinate transformation mode, transforming the geocentric rotating coordinate system into geocentric longitude and latitude Lc and Deltac, and finally transforming the geocentric longitude and latitude into geographical longitude and latitude lon and lat. In the method, the target positioning equations set does not contain an earth model equation, thus eliminating positioning errors caused by the ground elevation errors, avoiding the difficult problem of solving a Range-Doppler (R-D) positioning equations set, and being beneficial to real-time processing of ground target positioning.

The invention discloses a detection method of an automobile door based on vision measurement, comprising the following steps: (1) locating a standard automobile door in a locating workpiece, setting multiple measured points at the edges of the standard automobile door and the detected automobile door and setting multiple mark points on the locating workpiece; (2) working out the three-dimensional space coordinate of a first mark point; (3) working out the three-dimensional space coordinate of a first measured point; (4) working out gap distance between the first mark point on the locating workpiece and the first measured point on the standard automobile door; (5) repeating step (2)-step (4) to finish measuring the gap distances between all mark points on the locating workpiece and the measured points on the standard automobile door; and (6) replacing the standard automobile door, fixing the measured automobile door at the position of the standard automobile door and finishing measuring the gap distances between all mark points on the locating workpiece and the measured points on the measured automobile door. The method of the invention eliminates error of a robot, thus the detection precision can reach 0.1mm.

The invention relates to a nanometer positioning device and a nanometer positioning system, belongs to the technical field of automatic control of grating ruling machinery and solves the technical problems that in the prior art, the upper limit of the adjusting amplitude of a tilt angle and the adjusting precision of a nanometer positioning device are limited by the performance parameters, and the data collecting control module of a nanometer positioning system is large in developing difficulty. The nanometer positioning device comprises a substrate, a macro positioning platform, a first guiding guide track, a second guiding guide track, a micro-positioning platform, piezoelectric ceramic, a first laser interference displacement detection mechanism and a second laser interference displacement detection mechanism; one end of the piezoelectric ceramic is fixed on the macro positioning platform while the other end is contacted with the micro-positioning platform; the macro positioning platform slides along the first and second guiding guide tracks; the piezoelectric ceramic drives the micro-positioning platform to generate displacement. The invention also provides the nanometer positioning system applying the nanometer positioning device. The nanometer positioning device and the nanometer positioning system have a larger upper limit of the adjusting amplitude of the tilt angle and adjusting flexibility.

A method and special apparatus for excavating the concealed grotto in solid model experiment is disclosed. The axis marker shifted along with the preburied instrument is created in an absolute coordinate system. A locating method with three-stage transfer is used to convert the absolute locating system in absolute coordinate system to relative locating system. A special apparatus is desinged for excavation. Its advantages are eliminating the position error between concealed grotto and preburied instrument to maximum, and low cost.

The embodiment of the invention provides a positioning method. The positioning method comprises the following steps: a positioning server receives information sent by N positioning base stations separately, wherein the information comprises the time information of a positioning reference signal of a terminal to be positioned arriving at the positioning base stations and the time information of a positioning reference signal of a reference terminal with fixed position arriving at the positioning base stations, and the N is greater than or equal to 3; and the positioning server calculates the coordinates of the terminal to be positioned according to the time information. The embodiment of the invention also provides the positioning base station, the positioning server and a positioning system.

The invention relates to a position error eliminating method and device of a wire arrangement mechanism of a water tank wire drawing machine. The position error eliminating method comprises the following steps of: a, setting a pulse-given operating state; b, mounting an approach switch; c, before the wire arrangement operation, a wire arrangement guide wheel is reset to the position of a corresponding original point on a wire arrangement guide rod; d, starting up the wire drawing machine for wire arrangement; e, when the wire arrangement guide wheel moves to the position of the approach switch, outputting a fixed-point detection signal by the approach switch; f, when the wire arrangement pulse determined by the fixed-point detection signal is not matched with the preset wire arrangement pulse, regulating and compensating the wire arrangement pulse from the original point B to the other wire arrangement boundary by a controller so that the controller controls the wire arrangement motion distance of the wire arrangement guide wheel driven by a wire arrangement servo motor on the wire arrangement guide rod to be kept stable; and g, driving the wire arrangement servo motor to rotate by the controller according to the corresponding regulated and updated wire arrangement pulse. The position error eliminating method and device have the advantages of convenience in operation, high control precision, improved precision of wire arrangement position and good real-time property for compensation as well as safety and reliability.

The application relates to a rail transit locomotive polling pose detection system and method. The rail transit locomotive polling pose detection system comprises a basis reference, a pose detection device and a processing device; the basis reference is arranged at one side of the rail along a rail extending direction where a to-be-detected locomotive is parked; the pose detection device is arranged at a rail transit locomotive polling locomotive robot and used for detecting the distance information of the rail transit locomotive polling locomotive robot relative to the basis reference; the processing device communicates and connects with the pose detection device and is used for computing a pose offset of the rail transit locomotive polling locomotive robot relative to the reference coordinate according to the distance information of the rail transit locomotive polling locomotive robot relative to the basis reference. The rail transit locomotive polling pose detection system providedby the application can realize pose offset detection and is high in accuracy.

A locating and clamping method for machining piston includes providing machine-tool, cutter and fixture, using the top of the inner cavity of the piston to be machined as the point to be clamped, and using the external end face and locating boss of the piston as the locating surface. Its advantages are no deformation caused by clamping, high locating precision, and high productivity and quality.

The invention relates to numerically-controlled machine tools, in particular to a composite flexible manufacturing unit, and mainly aims to solve the technical problems that an existing flexible manufacturing unit is large in floor space and high in investment, large and medium key part machining is large in error due to multiple clamping and multiple positioning, low in machining precision and small in application range, and the like in the prior art. The composite flexible manufacturing unit comprises a flexible manufacturing unit base and is characterized in that at least one gantry machining center, at least one horizontal machining center, at least one vertical machining center base, at least one machine tool body, at least one saddle, at least one standing column and at least one spindle box are connected to the flexible manufacturing unit base. The flexible manufacturing unit is provided with a common base and a common working table which formed by the machining centers, a common flexible clamp and a common central control device, a conveying device is arranged outside the flexible manufacturing unit, the base is connected with the gantry machining centers and the horizontal machining centers composited to the same machine tool, and all of or part of the vertical machining centers are provided with tool magazines.

The invention relates to a processing technique capable of processing the interior parts of an integral differential mechanism casing by one step. The process adopts clamping once, and adopts a hydraulic power chuck, and a special claw is assembled to directly clamp the positioning surface of a workpiece; after the workpiece is clamped once, the inner sphere surface of the differential mechanism casing is firstly completed, and then the processing for key parts of two inner end surfaces and bearing hole working procedures are finished; a spherical surface machining cutter and a push rod are mounted in a cutter holder sleeve which is connected with an attachment, and the attachment is fixed on a machine tool sliding plate; the rear part of the push rod is connected with the connecting rod of a driving device; after entering into a processing part outside the cutter holder sleeve, the spherical surface machining cutter raises up under the action of the driving device to directly process the inner sphere surface of the differential mechanism casing; and the two inner end surfaces and the bearing hole of the differential mechanism are directly processed by an end surface scratching cutter without changing the clamping of the workpiece. The invention has the advantages of improving the machining precision and the production efficiency, saving the cost, lightening the labor intensity of an operator and improving the precision of the processed differential mechanism casing.

The invention discloses a vehicle positioning optimization method, a vehicle positioning optimization device, equipment and a storage medium and belongs to the field of automatic driving and can alsobe applied to the field of autonomous parking. According to the embodiments of the invention, the method is applied to electronic equipment. A vehicle carries a fusion positioning system and a perception positioning system which are used for determining a fusion vehicle pose and a sensing lane line. The method comprises the following steps that: target positioning information associated with optimized positioning information is acquired, wherein the target positioning information is determined through the electronic equipment and at least one positioning system mounted on the vehicle; an optimization model about the optimized positioning information and the target positioning information is constructed according to a preset positioning approaching strategy; the target positioning information is inputted into the optimization model, and the optimized positioning information in the optimization model is solved, so that the optimized positioning information can be outputted; and if the optimized positioning information passes verification, the optimized positioning information is sent to the vehicle so as to control the vehicle to drive according to the optimized positioning information.

The invention relates to a control device of an electrically adjusted antenna, comprising a motor and a declinational angle control module of the electrically adjusted antenna, wherein the motor is provided with a rotating shaft; the front end of the rotating shaft of the motor is connected with a phaser rotating shaft of the electrically adjusted antenna; and the declinational angle control module of the electrically adjusted antenna is connected with the motor. The control device of the electrically adjusted antenna is characterized in that the rear end of the rotating shaft of the motor is provided with an extending section extending outwards and provided with a screw thread thereon, and a slide block is sleeved on the extending section at the rear end of the rotating shaft of the motor in a sliding way; the control device of the electrically adjusted antenna also comprises two limit switches which can be triggered by the slide block, the distance between the two limit switches is consistent with the mechanical adjustment range of the electrically adjusted antenna, and the output ends of the two limit switches are connected with the declinational angle control module of the electrically adjusted antenna. Compared with the prior art, the invention has the advantages of accurately obtaining the moving distance of a phaser and having simple structure and convenient use.

The invention relates to an indoor visible light positioning and information push method based on frequency-shift keying, and belongs to the technical field of visible light communication. The method comprises the steps: modulating a signal comprising a data frame head, position information (ID) and data information through frequency-shift keying, and transmitting the signal through an LED; distinguishing different LEDs and the intensities of the LEDs at a receiving end through employing fast Fourier transform, obtaining the contents, transmitted by the LEDs, through inverse Fourier transform and a null point detection method, and obtaining the position information and the transmitted contents. The method is simple and practicable, is convenient to achieve, and can neglect the impact from background noises. Compared with a positioning method for transmitting the signal synchronously through the LEDs, the method reduces background redundancy, greatly improves the expansibility, and can eliminate the position error caused by background light.

The invention relates to a focalizing system and a focalizing method of a divergent terahertz light source optic light path. According to the invention, a terahertz array detector with a real-time detection function is utilized as a signal receiving display end, two kinds of established typical optic light paths containing divergent terahertz radiation sources are focused, and according to different focusing standards, focusing operation for the divergent terahertz radiation sources is completed. The focused optic light paths comprise parallel light path focusing and converging light path focusing, wherein the parallel light path focusing mainly adopts a method that the facula is invariable by translating the terahertz array detector and the converging light path focusing finishes the focusing of the divergent terahertz light source optic light path by taking the size and the strength of the facula as the basis. The system and the method overcome the problem of difficulty in focusing of a light source in the terahertz optical system.

The invention discloses an oil pan and a processing method thereof. The oil pan processing method comprises a first processing procedure, a second processing procedure and a third processing procedure; the first processing procedure comprises the following steps: clamping a to-be-processed oil pan body onto a first processing center, and utilizing a positioning hole in the oil pan body and the endface of the oil pan body for positioning; milling a cylinder block connecting surface; and drilling and reaming a first reference hole and a second reference hole; the second processing procedure comprises the following steps: clamping the oil pan body after being processed through the first processing procedure onto a second processing center, and utilizing the cylinder block connecting surface,the first reference hole and the second reference hole for positioning; and milling a belt mounting surface; and the third processing procedure comprises the following steps: clamping the oil pan body after being processed through the second processing procedure onto a third processing center, and utilizing the cylinder block connecting surface, the first reference hole and the second reference hole for positioning; milling a lower oil pan mounting surface; and tapping the internal thread of the positioning hole. The oil pan processing method can ensure product size stability and the pace balance among all procedures.

The invention discloses a one-face two-pin precise positioning system. The one-face two-pin precise positioning system is characterized by comprising a worktable, a round pin positioning device, a diamond pin positioning device and a control system; the control system comprises a first power device and a second power device, the first power drive drives a first plunger to move in a plunger hole of a round pin, the round pin is driven to move upwards by upwards extruding hydraulic plastics, the positioning portion of the round pin is inserted into a corresponding positioning hole of a workpiece, the positioning portion of the round pin generates corresponding plastic deformation and expands, and the gap between the round pin and the corresponding positioning hole in the workpiece is reduced. The second power device drives a second plunger to move in a plunger hole of a diamond pin, the diamond pin is driven to move upwards by upwards extruding the hydraulic plastics, the positioning portion of the diamond pin is inserted into a corresponding positioning hole of the workpiece, the positioning portion of the diamond pin generates corresponding plastic deformation and expands, and the gap between the diamond pin and the corresponding positioning hole in the workpiece is reduced.

The invention discloses a skip distance correction WSN three-dimensional space target positioning method based on coplanarity. The method comprises the following steps: first, the RSSI distance measurement technology is employed to measure a distance between adjacent nodes; second, beacon node information is received and transmitted through a distance vector exchange protocol, and minimum skip values and cumulative distance of all the nodes and a beacon node are obtained; third, a correction parameter is calculated, and the cumulative distance is corrected according the correction parameter; fourth, the coplanarity value of each positioning unit is calculated, and the best positioning unit is selected based on the coplanarity values; fifth, a four-face measuring method is employed to calculate a coordinate of an unknown node according to the selected best positioning unit; sixth, a quasi-Newton method is employed to optimize the coordinate of the unknown node; seven, the node positioned successfully is raised to a beacon node to participate in secondary positioning. The best positioning unit suitable for positioning is selected based on coplanarity values, the quasi-Newton method is employed to raise the positioning result precision, and positioning precision and the positioning coverage rate of three-dimensional space positioning can be raised.

The invention provides an indoor positioning and navigation method based on a MPU6050 and a smart phone. The MPU6050 wirelessly transmits double-feet walking measurement data of a user to the smart phone through Bluetooth; the position error of an inertia device itself is reduced through a zero-bias correction algorithm, and with a modified zero velocity correction accumulated error reducing algorithm, a data collected by an acceleration sensor is subjected to time-domain integration for one time to acquire speed, and the speed is then corrected through a modified zero velocity detection method; then frequency domain integration is carried out for one time to calculate walking displacement information which is more accurate; in determination of pedestrian movement direction angle, on the basis of advantages and defects of electronic compass and gyroscope on the smart phone, sliding mean wave filtering and angle compensation aslgorithms are designed; through setting of a threshold value, a proper direction is selected, thus increasing the accuracy of the direction of a pedestrian. By fusing the data of both feet, the weight of left and right feet is obtained through training by neural network, thereby obtaining more accurate pedestrian track information and finally acquiring more accurate pedestrian position information.