81results about How to "Does not affect positioning accuracy" patented technology

The invention provides an annular thin-wall article clamping device and a using method of the device. The clamping device comprises an annular chassis; the chassis is provided with a radial regulation mechanism of a locating workpiece; the radial regulation mechanism is divided into an inner radial regulation mechanism and an outer radial mechanism; two radial regulation mechanisms position workpiece respectively from the inner side or the outer side of the workpiece; the chassis is respectively provided with track-directed sliding grooves for the two radial adjustment mechanisms; the inner end of the sliding groove of the inner radial regulation mechanism is provided with a stopping block; the outer end of the sliding groove of the outer radial regulation mechanism is provided with the stopping block; the sliding grooves of the two groups of radial regulation mechanisms are disposed at intervals; one of the two groups of radial regulation mechanisms is provided with an axial compacting mechanism for fixing the workpiece; and the axial compacting mechanism is displaced alternatively between the two groups of radial regulation mechanisms when turning the workpiece. The clamping device can realize the processing of two side walls of the workpiece by clamping the workpiece once, and is fit for the clamping of the workpieces with different specifications. The device has the characteristics of high use rate, strong practical applicability, good generality, time saving and labor saving, light labor intensity, high production efficiency and the like.

Devices related to a near-drowning behavior detection method fusing UWB indoor location with a video target detection and tracking technology comprise a smart bracelet module, an intelligent monitoring information processing module, a communication module and a display alarm module, the smart bracelet module is used for performing indoor location, the intelligent monitoring information processingmodule is used for processing video data acquired by an intelligent monitoring camera, location information of a smart bracelet and water depth information; and the communication module is used for realizing information transfer among the smart bracelet module, the intelligent monitoring information processing module and the display alarm module. Specific detection steps of the near-drowning behavior detection method are performed according to the following way: performing system initialization; and building a relationship among an image of the intelligent monitoring camera, location of the smart bracelet module and a swimming pool coordinate system, then setting near-drowning conditions, and performing near-drowning determination by virtue of a near-drowning detection algorithm. The near-drowning behavior detection method is simple in main body structure, smart in design concept, good in using effect, high in detection accuracy, low in maintenance cost, friendly in application environment and broad in market prospect.

The invention provides a fixture for a three-coordinate measuring machine of a blade and a method for establishing a measuring coordinate system. An upper surface of a fixture body is provided with a V-shaped tongue-and-groove, and a wedge-shaped surface of the V-shaped tongue-and-groove is completely coincided with a wedge-shaped surface of a blade tongue root. The V-shaped tongue-and-groove is positioned on a central line of a width of the fixture body. A set screw is positioned on a symmetric centre of a length and the width of the fixture body. When the measuring coordinate system of the fixture for the three-coordinate measuring machine of the blade is established, a coordinate plane is established through three points, a coordinate axis is established through projections of a connecting line of the two points on the coordinate plane and a coordinate origin point is determined by one point, and thereby the measuring coordinate system of the blade is fast and accurately established; moreover, the measuring coordinate system can be fast converted from the blade tongue root to the fixture body by using the rectangular fixture body so as to reduce time and difficulty of establishing the measuring coordinate system in the blade measuring process. The fixture of the invention has the advantages of simple structure, convenience for mounting and high locating precision, can be detached for multiple times without affecting the locating precision, can realize batch measurement of the blades and increases the blade measuring efficiency.

The invention discloses an indoor positioning method of path attenuation coefficient based database construction. The method is divided into a training stage and a positioning stage; the training stage is mainly to obtain a corresponding attenuation coefficient of each reference node in the environment and an average attenuation coefficient of signal propagation in the environment by utilizing the known received signal strength and distance information; the positioning stage is mainly to obtain a distance between a blind node and the corresponding reference node and a distance between the blind nodes by utilizing the corresponding attenuation coefficients of the reference nodes in the environment which are obtained in the training stage, thereby obtaining a relative coordinate position of each blind node. The indoor positioning method is high in positioning precision, simple in implementation, low in system power consumption and low in cost.

The invention discloses a geographical coordinate positioning system and method based on 3D point cloud aerial photographing images. The system comprises a 3D point cloud establishment module, a homography module and a conversion module. Correspondingly, the method comprises the following steps: firstly, performing three-dimensional digitization on an image sequence according to an SFM method, rapidly acquiring 3D sparse point cloud in a world coordinate system, and establishing a homography H for representing the relationship of a geographical coordinate and a pixel coordinate of characteristic points in the 3D point cloud; respectively processing two different positioning requirements. According to the method, 3D point cloud with high precision is introduced into positioning of 2D images, so that positioning difficulties caused by non-normal incidence of the 2D images are substantially solved; when the relationship of the geographical coordinate and the pixel coordinate is established, positioning precision is ensured to the maximum extent in such a mode that reference points are searched within a minimum range; therefore, the method is high in positioning precision, and has great significances for modules of range constraint, target positioning, geographical marking and the like in aerial photographing patrol items.

The invention provides an indoor personnel positioning system and method based on an infrared human body sensor array. The system comprises a plurality of detecting nodes, a base station node, and a host computer. The detecting nodes are arranged at different positions indoors. The base station node is connected with the host computer through a serial port connecting line. The detecting nodes are wirelessly connected with the base station node. Each infrared human body sensor array comprises four infrared human body sensors. Each infrared human body sensor has a 90-degree detecting range such that each infrared human body sensor array may achieve 360-degree omnibearing detection. Each detecting node transmits a detected result to the base station node via a Zigbee network in order to compute personnel positions. Personnel to be positioned are not required to wear any tag or signal source and are completely passively positioned. The indoor personnel positioning system is high in positioning precision. Since each infrared human body sensor has an about 6-meter detecting radius, the information of more than 3 detecting node may achieve about 1-meter positioning precision which may completely satisfy an indoor personnel positioning requirement.

The present invention discloses a marker positioning method and system of a calibration plate image. The method includes the following steps that: image pyramid layering is performed on the calibration plate image; binarization is performed from a topmost layer of image, a calibration plate area and a marker contour are searched in the binary image, if no calibration plate areas and marker contours are found out, the calibration plate area and the marker contour are further searched in a next layer of image until search is performed in the last layer or the calibration plate area and the marker contour are found out; and the bounding rectangle of the marker contour in the calibration plate area is calculated in the pyramid image of the searched calibration plate area, the bounding rectangle is mapped into the calibration plate image, so that a region of interest containing a marker is obtained, and the center coordinates of the marker are calculated. Therefore, contour search is performed from the top-layer low-resolution image, so that the calibration plate area and the marker contour can be found out, and the region of interest containing the marker can be positioned quickly and accurately, and positioning efficiency is improved.

The invention discloses a positioning and checking tool for side vertical control over optical prisms and a processing method, and belongs to the technical field of optical prism processing. The positioning tool comprises a base plate, positioning triangular prisms, an end surface positioning block and a side surface positioning block; the two positioning triangular prisms are oppositely arrangedon the base plate and form a V-shaped positioning groove; the end surface positioning block is arranged on the position, on one sides of the positioning triangular prisms, of the base plate and is provided with an end positioning surface; the end positioning surface is perpendicular to the upper surface of the base plate and is perpendicular to the projection plane, on the base plate, of the groove surface of the V-shaped positioning groove; the side positioning block is arranged above the V-shaped positioning groove and is provided with a side positioning surface; and the side positioning surface is perpendicular to the groove surface of the v-shaped positioning groove and the end positioning surface of the end surface positioning block. The processing method comprises the following stepsof firstly, assembling the positioning tool through a checking tool; then carrying out vertical positioning on a square prism by using the positioning tool; and finally, grinding the bevels at the two ends of the square prism. According to the positioning and checking tool and the processing method, the square prism can be conveniently and quickly positioned, and the side vertical precision of the bevels at the two ends can be guaranteed to be within 20 arc seconds.

The embodiment of the invention provides a method and a device for determining feature points during synchronous positioning and map construction. The method comprises the steps of acquiring the imageinformation by image acquisition equipment; based on the acquired image information, acquiring a set of first feature points in the image information; analyzing non-static feature points in the set of first feature points, wherein the non-static feature points are feature points corresponding to a moving object; filtering the non-static feature points out of the set of first feature points to generate a set of second feature points. Based on the method and the device, non-static feature points can be simply and conveniently removed, so that the accuracy and the speed of map construction are improved.

The invention relates to a wireless communication networking and positioning method for a constructional engineering construction site, and belongs to the technical field of indoor and outdoor positioning. The method solves the personnel indoor and outdoor positioning application problem in the building construction site, and especially solves the practical problems of how to construct a network in the building construction site, how to switch indoor and outdoor space positioning and how to apply. The method specifically comprises the following steps: (1) networking a positioning system; (2) networking a wireless network; (3) indoor and outdoor personnel positioning: offline positioning and online positioning are included, wherein the offline positioning comprises data acquisition, data filtering, data grouping, positioning model training and positioning model output; and online positioning comprises data acquisition, data filtering, input positioning model operation and positioning coordinate output. According to the invention, a Lora radio frequency RSSI fingerprint training model is established by using a Lora base station and is used for positioning indoor and outdoor spaces; the method is different from other indoor and outdoor hybrid positioning methods, indoor and outdoor positioning can be integrated, and a method of switching between outdoor GNSS positioning and indoorpositioning in a buffer zone is abandoned.

The invention discloses a workpiece clamping mechanism which comprises a supporting plate, an elastic piece, a supporting barrel and a locating barrel. The upper end of the supporting barrel is open, the lower end of the supporting barrel is closed, the locating barrel and the supporting barrel are arranged coaxially, and the upper end and the lower end of the locating barrel are open. The supporting plate is located above the supporting barrel, a first through opening is formed in the supporting plate, the center line of the first through opening and the axis of the supporting barrel are overlapped, the upper end and the lower end of the elastic piece are fixedly connected with the lower end face of the supporting plate and the bottom of the inner wall of the supporting barrel respectively, the supporting barrel is sleeved with the locating barrel, a plurality of clamping jaws used for locating top points of workpieces are arranged at the upper end of the locating barrel, and the inner side faces of the clamping jaws are gradually inclined towards the axis of the locating barrel from bottom to top. The workpiece clamping mechanism has the advantages that clamping is convenient and firm, relocating precision is high, good universality is achieved, and the structure is simple.

A parallel clamping device for clamping small components comprises a transmission part used for converting the rotation movement of a motor into the parallel movement of a clamp, a clamping tail end used for executing output, and a flexible clamp part serving as control clamping force. The action end of the transmission part is connected with the flexible clamp part. The flexible clamp part comprises a rigidity clamp body and a soft clamp body which are symmetrically arranged. The soft clamp body comprises a base, a spring, a spring adjusting rotary knob, a spring adjusting piece, a positioning pin and an upper part. A sliding groove is formed in the base. The upper part is located in the sliding groove in a sliding manner. The positioning pin is arranged in the sliding groove. The positioning pin is located on one side of the upper part. The other side of the upper part abuts against one end of the spring. The other end of the spring is arranged on the spring adjusting piece. The action end of the spring adjusting rotary knob abuts against the spring adjusting piece. The clamping tail end is located on the upper part. The parallel clamping device is high in precision, effectively suitable for the small component clamping assembling environment and good in universality.

The invention belongs to the technical field of welding spot positioning, and relates to a welding spot positioning method based on image processing, which comprises the following steps: S1, reading a first welding spot estimated coordinate (xc, yc, zc) from a welding spot design file, wherein xc is the estimated abscissa of the center of the first welding spot, yc is the estimated ordinate of the center of the first welding spot, and zc is the shooting height of a camera; S2, moving the camera to an estimated coordinate; S3, performing automatic focusing based on the image definition; S4, after the clear image of the workpiece is obtained, calculating the center position coordinate of the welding spot workpiece, replacing the design coordinate value of the welding spot with the calculated coordinate value, and completing positioning of the welding spot coordinate; and S5, judging whether coordinate positioning of all the welding spots is completed or not, if so, ending the program, otherwise, reading the estimated coordinate of the next welding spot, and returning to the step S2. According to the invention, the welding spot coordinate positioning efficiency and accuracy can be improved. The invention further provides a welding spot positioning system based on image processing.

The invention discloses a pseudo-range differential method with a time maintaining characteristic. A pseudo-range differential strategy with the time maintaining characteristic is utilized. According to the method, a mobile station user receives reference station data; and the mobile station user can realize continuous positioning for about one minute, thereby ensuring positioning continuity of a user terminal, reducing data traffic of the mobile station user from a reference station, and reducing positioning cost of the user.

The invention discloses process holes for back-end procedures in flat-shape covering part stamping production. Each process hole is in a periphery rounded equilateral triangle shape, and the size of each process hole is internally tangent to a circle of phi 3-phi 6. The process holes are used for part precise locating in procedures after trimming and punching and are formed in a supplement part of a drawing process. The number of the process holes is larger than or equal to 2. The invention discloses a locating method of a flat-shape covering part after trimming at the same time. According to the process holes for the back-end procedures in flat-shape covering part stamping production, it is guaranteed that the flat-shape covering part, an automobile engine hood outer plate, is fast and accurately located; locating precision is high; stamping production operation is convenient; product consistency is good; production efficiency is high; product quality is stable; and the product percent of pass is high.

The invention discloses a descending track spotlight SAR (synthetic aperture radar) positioning method based on image matching. The method has the technical scheme that 1, a radar positioning geometrical configuration under a NEU coordinate system is built by using a ground point target T as an original point, and an SAR imaging image of the target point T on the imaging plane is obtained; 2, an SAR imaging matching graph is obtained by using a geometric distortion correcting mapping function between the imaging plane and the ground plane; 3, an affine transform matrix between P matching points and the SAR imaging matching graph and the set SAR imaging reference graph is obtained through an imaging matching algorithm, and the distance from the target point T and a sight line point C is obtained by using the affine transform matrix; 4, according to the set sampling frequency, the distance from the radar to the target point T and the distance from the radar to the sight line point C are obtained; 5, the coordinate values of the radar practical position A is calculated according to the results obtained in the steps 3 and 4. The method has the advantages that the precise positioning of a high-squint spotlight SAR can be realized; accurate position information can be provided for radar platform deflection correction.

The invention discloses a path navigation method. The path navigation method comprises the following steps of acquiring a target planning path of a vehicle, and determining positioning information ofthe vehicle according to a radar pattern layer corresponding to the vehicle and laser radar; acquiring a first image corresponding to the vehicle by a depth camera; controlling the vehicle to drive according to the positioning information, the first image, an obstacle-prevention pattern layer and the target planning path of the vehicle. The invention also discloses a path navigation device and a computer readable storage medium. The vehicle is positioned by the radar pattern layer, path planning and obstacle prevention are performed according to the positioning information and the obstacle-prevention pattern layer, the positioning accuracy of the vehicle is not affected by the laser radar of which installation height is larger than the height of an obstacle when the obstacle exists in thetarget planning path, and the navigation accuracy and efficiency of the vehicle is further improved.

The invention relates to a positioning and verticality adjusting device for a rectangular latticed column of a foundation pit by a reverse construction method. The positioning and verticality adjusting device comprises a base and a rigid frame body. An extending hole for an engineering pile is formed in the base, the frame body is formed by interconnecting the end parts of vertical upright rods, transverse connecting rods and inclined connecting rods, the bottom, the lower part and the upper part of the frame body are respectively provided with a bottom supporting and adjusting bracket capableof adjusting and limiting the verticality of the frame body and upper and lower positioning brackets capable of accurately adjusting limiting the latticed column in a vertical state by virtue of theframe body, the top of the frame body is provided with an operation platform which comprises an operation platform surface, a guard fence, a protection door, a hopper bracket and a hopper and is convenient for safely and vertically pouring concrete, the poured concrete naturally falls along with a pouring guide pipe at the axis position of the latticed column to be poured, impact disturbance on the latticed column is avoided, the positioning accuracy of the positioning and perpendicularity adjusting device cannot be affected, construction is convenient and efficient, the final forming effect of the poured engineering pile and the construction quality of foundation pit engineering can be guaranteed, and high practicability is achieved.