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1240results about How to "Reduce positioning errors" patented technology

Dynamic positioning method and device based on UWB and laser ranging combination

The invention discloses a dynamic positioning method and device based on UWB and laser ranging combination and belongs to dynamic positioning methods and devices. The dynamic positioning device comprises an ultra-wide band (UWB) wireless communication sensors, a UWB positioning label, laser ranging sensors, an upper computer and a POE interchanger. An ultra-wide band (UWB) wireless communication sensor station is arranged in an area to be detected, the laser ranging sensors are installed on and fixed to the ultra-wide band (UWB) wireless communication sensors, the UWB positioning label is fixed to a target to be detected, and the ultra-wide band (UWB) wireless communication sensors and the laser ranging sensors are connected with the upper computer through the POE interchanger. According to the dynamic positioning method and device based on the UWB and laser ranging combination, the laser ranging sensors are arranged on the ultra-wide band (UWB) wireless communication sensors respectively, so that the relative distance between every two adjacent ultra-wide band (UWB) wireless communication sensors is obtained, in this way, the coordinates of the ultra-wide band (UWB) wireless communication sensors can be re-determined or corrected after the ultra-wide band (UWB) wireless communication sensors are moved, and thus the requirement for dynamic positioning is met. The dynamic positioning method and device based on the UWB and laser ranging combination have the advantages that the dynamic positioning method based on the UWB and laser ranging combination is adopted, positioning is accurate, safety and reliability are guaranteed, installation is easy, and operation is convenient.
Owner:CHINA UNIV OF MINING & TECH

Locking control method and system of large-stroke nanometer displacement positioning macro-movement bench

The invention relates to a locking control method of a large-travel nano-displacement and positioning macro-motion table as well as a system thereof. The method comprises the operating steps: (1) a communication interface of a computer (upper computer ) sends an instruction for controlling, firstly, a macro-positioning system is started up to drive the macro-motion table and a micro-motion worktable to move together, and the macro-positioning is finished when the detected positioning error is smaller than the switching threshold value; (2) the computer controls and locks the macro-motion worktable, and is switched to a micro-positioning system dynamically in the meanwhile; and (3) the micro-positioning system controls the micro-motion worktable to further reach the target location required by the system and complete the positioning. The system mainly comprises: the macro-motion table and the micro-motion worktable as well as corresponding driving systems; a grating feedback system; a PMAC controller; a laser interferometer calibration system; a computer system; and a vibration isolation and noise elimination device (an air floatation vibration isolation platform) and the like. The hardware structure of the existing system is configured (a piezoelectric ceramic driving device) by adopting the method as required, when the macro-motion table meets the positioning requirements and stops the movement, piezoelectric ceramics lock the table, thereby improving the positioning accuracy of the system.
Owner:SHANGHAI UNIV

Method and clamp for moulding surface positioning clamping of finish forge blade

The invention relates to a method and a clamp for moulding surface positioning clamping of a finish forge blade. According to the method, a vane is subjected to positioning clamping through a basin mounding surface of the blade, an inner side moulding surface of a blade root marginal plate, and a V point on the inner side mounting surface of the blade root marginal plate, by the positioning of an air inlet edge, and the clamping of a back mounding surface of the blade, as well as by using a high-accuracy positioning adhesive, and an adhesive coating method, and through a positioning block of the basin moulding surface of the blade and a clamping block of the back moulding surface of the blade. According to the method and the clamp, a satisfying contact area can be obtained by adoption of the high-accuracy adhesive, and the positioning rigidity of the blade is enhanced by adoption of the basin moulding surface of the blade, the inner side moulding surface of the blade root marginal plate and the V point on the inner side moulding surface of the blade root marginal plate for the positioning. According to the method and the device, the problems that the accurate positioning is difficult to realize and the moulding surface of the blade deforms or is damaged because the blade is thin, the blade body is small and the moulding surface is complex are solved. By the method and the device, the positioning accuracy of the mechanical processing of the blade is improved, and the technological process is optimized, so that the processing quality and the production efficiency of the blade are improved, the process is simple, the number of fixtures is reduced, the processing cycle is shortened, and the production cost is reduced.
Owner:AECC AVIATION POWER CO LTD

Indoor positioning method based on BP neural network and improved centroid algorithm

The invention relates to an indoor positioning method based on a BP neural network and improved a centroid algorithm, belonging to the field of wireless communication and intelligent control. The indoor positioning method comprises the steps of: carrying out data acquisition under an indoor environment, recording and storing reference node coordinates, blind node coordinates, a distance d between a reference node and a blind node and corresponding receiving signal strength indicators (RSSI) during experimenting; training an established BP neutral network by using the RSSI and the distance d; training and checking the established BP neutral network by using an actual RSSI and the corresponding distance d to obtain a function; calling the function to obtain the distance d of the reference node and the blind node; obtaining more than three reference nodes with the distance d from the blind node; taking the three reference nodes with highest RSSI, obtaining three circles with the distance d as a radius; and solving two points of lines of centers of three circles in pairs with two points crossed with two circumferences to obtain six points, and solving centroids of the six points, i.e. the blind node coordinates. The method is more accurate in positioning, thus algorithms are simplified.
Owner:BEIJING UNIV OF TECH

Wearable indoor positioning system based on radio frequency identification technology and method thereof

The invention discloses a wearable indoor positioning system based on a radio frequency identification technology and a method thereof, wherein the method comprises: using an RFID electronic tag as a receiving end infrastructure and burying on the ground of a known environment, establishing the one-to-one mapping between the ID mark of each RFID electronic tag and the coordinate information of the position where the RFID electronic tag is; sewing a transmitting end reader-writer and a reader-writer antenna on the clothes of a user; firstly reading a mapping relationship list of the ID mark of the RFID electronic tags in the known environment and geographic information stored in a tag user area recorded on a map after the user enters the known environment, reading the ID mark information of the RFID electronic tag in the known environment in the actuating range of the reader-writer antenna by using a fixed sampling period, calculating the position where the user is at present in real time, and displaying the position on the map of a display unit so as to provide the solution for indoor positioning with real-time response, high precision and low cost for the user.
Owner:INST OF AUTOMATION CHINESE ACAD OF SCI

UWB-based precise calibration method for coal-cutter absolute position and apparatus

InactiveCN104612682AAbsolute Position Accurate CalibrationIncrease transfer rateSlitting machinesUltra-widebandHigh bandwidth
The invention discloses a UWB-based (Ultra Wideband) precise calibration method for a coal-cutter absolute position and an apparatus. The apparatus comprises a coal cutter body, a coal-cutter positioner, a positioner explosion-proof housing, a host computer, four ultra-wideband (UWB) wireless communication sensors and a POE (Power Over Ethernet) switch; the coal cutter body is fixedly provided with the positioner explosion-proof housing; the positioner explosion-proof housing is inside provided with the coal-cutter positioner; the coal-cutter positioner is inside provided with a UWB positioning label; the ultra-wideband (UWB) wireless communication sensors are fixedly disposed on a hydraulic support at a coal-cutter running end at intervals; and the ultra-wideband (UWB) wireless communication sensors are connected with the host computer via the POE switch. ultra-wideband (UWB) wireless communication is utilized for precise calibration, the anti-interference capability is strong, the transmission speed is high, relatively high bandwidth and relatively low power consumption are provided, and also precise positioning for a downhole coal cutter is provided, and the apparatus is safe, reliable, easy to install and convenient to operate.
Owner:CHINA UNIV OF MINING & TECH

Indoor localization method based on clustering algorithm analytical data optimization

The invention relates to an indoor localization method based on clustering algorithm analytical data optimization, which is used for carrying out accurate localization on an unknown node in a complex index environment. The indoor localization method comprises the steps of: executing an RSSI (Received Signal Strength Indicator) signal processing optimization strategy, i.e., optimizing an RSSI value by using a clustering analysis Gaussian hybrid filtering model so as to eliminate the problems of dispersed intersection and serious jitter of the RSSI value, which exist due to factors of a multipath effect, a barrier and the like, and obtain one more reliable and reasonable RSSI value; adopting a fitting RSSI distance measurement model, i.e., according to an RSSI-distance conversion curve, carrying out fitting of the curve by adopting a least square method so as to obtain a logarithm path loss model suitable for a current environment; and then estimating out position information of the unknown node by using a weighted centroid localization algorithm. According to the indoor localization method disclosed by the invention, by an optimal RSSI distance measurement algorithm, accuracy of localization and distance measurement is improved, so that adaptability and localization accuracy of the localization algorithm are improved; and the indoor localization method is suitable to apply and popularize in the complex indoor environment.
Owner:TIANJIN UNIV

Fingerprint map matching method based on Euclidean distances

InactiveCN103596267AThe average positioning error increasesReduce positioning errorsWireless communicationWeight coefficientEuclidean vector
The invention discloses a fingerprint map matching method based on Euclidean distances, and relates to the technical field of fingerprint locating. The fingerprint map matching method based on the Euclidean distances aims to solve the problems that a traditional WKNN algorithm is low in locating accuracy, and the value of k can have large influences on locating results. The fingerprint map matching method based on the Euclidean distances comprises the first step of evenly distributing n receiving machines for AP in an area to be measured to measure the RSS vectors of m points to be measured, a second step of measuring the RSS vectors as (RSS1, RSS2, ..., RSSn) of located points at the located points, a third step of calculating the Euclidean distances from the located points to the m points in the fingerprint map in sequence, a fourth step of ranking the Euclidean distances in the third three from small to larger, a fifth step of calculating the weighing coefficients ql of the front k points, and a sixth step of carrying out summing after weighing is carried out on the physical coordinates of the obtained first k points obtained in the fourth step by using corresponding weighting coefficients to obtain the physical coordinates of the located points. The fingerprint map matching method based on the Euclidean distances is applied to the fingerprint locating area.
Owner:HARBIN INST OF TECH

Positioning support device for stir friction welding of storage box cylinder section circular seam

The invention belongs to aerospace product machining technology equipment and particularly discloses a positioning support device for stir friction welding of a storage box cylinder section circular seam. A central shaft disk is arranged above a rotating base seat, a support ring is arranged in the center of the central shaft disk, a top ring is arranged above the central shaft disk, a connecting disk is arranged above the central support ring, long support rods are arranged outside the connecting disk, a short support rod is connected with the rear end of each long support rod, and internal threaded holes are arranged in two ends of left end and right end of a double-stud structure of an adjusting sleeve and respectively connected with the long support rods and the short support rods; the rotating base seat is a perpendicular long positioning rod and a pressing rod, and a pressing plate is arranged above the pressing rod; and a perpendicular short positioning rod is installed between the short support rods and the rotating base seat. Due to the cyclic structure which is formed by the long support rods and the short support rods is adopted, products on a cylinder section can be positioned and supported, positioning error is effectively reduced, and tolerance requirements of welding can be met, and at the same time, parameters in the welding process are stable, internal stress and deformation are small, and positioning support device is further favorable for preventing weldments from being pierced through by a stirring needle.
Owner:CAPITAL AEROSPACE MACHINERY +1

Chassis type automatic electric automobile battery changing station

InactiveCN106627513AOvercome the problem of only charging but not replacing the batteryLarge amount of workCharging stationsElectric propulsion mountingElectricityTest battery
The invention belongs to the field of electric automobile battery change and relates to a chassis type automatic electric automobile battery changing station. The chassis type automatic electric automobile battery changing station comprises a battery changing robot, a transfer machine, a charging frame and a charging machine. The battery changing robot is located on one side of the charging frame, and the charging machine is located on the other side of the charging frame. A transfer track in the advancing direction of an electric automobile is arranged between the battery changing robot and the charging frame. The transfer machine is located on the transfer track. The chassis type automatic electric passenger vehicle battery changing station can automatically take down batteries lack of electricity from an electric automobile, put in batteries full of electricity and automatically charge the batteries lack of electricity. Especially for large-scale and heavy-type batteries, the problem that the batteries can be charged but cannot be changed is solved, the batteries are protected, and a reference basis is provided for development of new energy automobile battery changing modes.
Owner:XIAN AEROSPACE PRECISION ELECTROMECHANICAL INST

Method for instant positioning and map building based on fusion of laser and two-dimensional code

The invention provides a method for the instant positioning and the map building based on the fusion of a laser and a two-dimensional code. The driving distance and the speed information of an odometer, a two-dimensional code acquired by a monocular camera, and the information of an inertial measurement unit are integrated into a state vector. An observation equation of the federated Kalman filteris constructed according to an observation model of the odometer, an observation model of the inertial measurement unit, and an observation model of the monocular camera. The two-dimensional code positioning information is added on the basis of a traditional odometer and the inertial measurement unit, thereby obtaining the optimal solution of the state vector of an unmanned mobile platform; the pose prediction information with higher accuracy is formed by using the characteristics of the fastness and the accuracy of the two-dimensional code information processing, thereby reducing the numberof particles in the method for particle filter instant positioning and map building, and improving the low-power processor, such as the positioning accuracy of the unmanned mobile platform. The positioning effect of the unmanned mobile platform in the complex environment is ensured, map building is completed, and the application need in the complex environment is met.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY

Visible light indoor positioning method

The invention discloses a visible light indoor positioning method. The positioning method is based on a positioning system composed of an LED signal source, a mobile terminal and a control end. The positioning method specifically comprises the following steps that 1 LED-ID information is loaded on the LED signal source and transmitted to the mobile terminal through a wireless optical link, and the mobile terminal determines the LED lighting coverage area according to the received LED-ID information to realize coarse positioning; 2 the mobile terminal conducts query match between obtained fingerprint information and a multi-parameter position fingerprint database, the position, relative to an LED, of the mobile terminal in the area is determined, and fine positioning is realized. According to the multi-parameter position fingerprint database positioning method, it is only required that query matched is conducted between the received fingerprint data (theta and RSSI) and data, in the theta direction in the current LED coverage area, in the fingerprint database to determine the position of the mobile terminal, therefore, the expense at the match stage is greatly reduced, the positioning speed is increased, the positioning precision is improved, and the positioning error is reduced.
Owner:NANJING UNIV OF POSTS & TELECOMM

Method and device for positioning based on grid map

The embodiment of the invention discloses a method and a device for positioning based on a grid map. The method comprises the following steps of creating the grid map, and calculating the position information and image information corresponding to each grid according to the position information and image information of each coordinate point in each grid; obtaining the image of the current position, and respectively calculating the corresponding matching probability of the image and each grid according to the image information of the image and the image information of each grid in the grid map; respectively updating the matching probability in real time, and determining the target grid corresponding to the image according to the updated matching probability; according to the position information of the target grid, determining the current position. The method has the advantages that the positioning is performed on the basis of created grid map, a more accurate result can be quickly obtained, the probability of complete positioning failure is reduced, and the positioning error is reduced; the target grid is matched via the image information, so that the result with better robustness is obtained under the scenes of low texture, camera focal dispersing, movement fuzzy and the like.
Owner:北京如布科技有限公司

2.5D location method based on neural network and wireless LAN infrastructure

A positioning method based on neural network and wireless local area network basic structure is proovided, belonging to the wireless local area network client positioning. The data collecting module, database, positioning request module, positioning calculating module and positioning displaying module are arranged on the positioning server of the wireless local area network; the positioning server is accessed to AP via wireless accessing point obtaining the signal intensity information transmitted by a laptop of the client in a period of time under the predetermined distance interval and measuring time interval, and obtaining the floor number of the client and plane coordinate in real-time way by using Matlab Neural Network kit and displaying the floor number of the client and plane coordinate for the laptop of the client via web page; the signal intensity information comprises date, measuring time, identification of the wireless accessing point, client MAC and signal intensity. The average positioning error is 4.44m while the average sampling distance interval is 6.6m; the average positioning error is 2.98m while the average sampling distance interval is 3.7m, which is better than the effect of the Radar method.
Owner:TSINGHUA UNIV

Inertial navigation-laser scanning integrated coal mining machine positioning device and method

The invention discloses an inertial navigation-laser scanning integrated coal mining machine positioning device and method, and belongs to coal mining machine positioning devices and methods. The positioning device adopts the structure that a positioning device explosion-proof housing and a laser signal receiving module are fixed on the main body of a coal mining machine; an inertial navigation positioning device and a laser scanning microprocessor are mounted in an explosion-proof device; when the coal mining machine works, the inertial navigation positioning device acquires the real-time angular rate and the real-time through a sensor, and transmitting the data to the laser scanning microprocessor; in a laser scanning device, a laser scanning base station is arranged in the working area of the coal mining machine, a laser signal of the laser scanning base station is received by the laser signal receiving module, and meanwhile the data are transmitted to the laser scanning microprocessor; the laser scanning microprocessor is connected with an upper computer through a serial port. Respectively acquired positioning data are transmitted to a coal mining machine positioning control system for data processing, and the position of the coal mining machine is confirmed according to an algorithm integrating the least square method and the neural network algorithm, so as to realize precise positioning; the positioning device and method have the advantages of being precise in positioning, safe and reliable.
Owner:CHINA UNIV OF MINING & TECH
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