41results about How to "Eliminate the effect of positioning accuracy" patented technology

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 a full-automatic cutting machine of numerical controlled valve, which comprises a machine body, a feeding mechanism, a positioning mechanism, a geared head, a knife rest mechanism, a pushing mechanism and a numerical controlled electric box. The positioning mechanism utilizes a rigid ball base rotary positioning head and a positioning fixture at the end face of a valve disk part in the geared head to realize the full length cutting processing of the valve, and utilizes a flexible ball base rotary positioning head and a positioning fixture at the conical surface of the valve disk part in the geared head to realize the L-check size grooving processing of the valve. The rigid and flexible ball base rotary positioning heads overcome friction between workpieces and a positioner, eliminate the influences of the flat beat of the valve on positioning precision and the length precision of the processed valve reaches +/- 0.025mm. The cutting machine has simple structure, convenient operation and high full-automatic processing efficiency, is applicable to the full length cutting and grooving of the valve, and can be expanded to use the conical surface of the valve to position and process a sandwich groove of a lock and chamfer the end face of a valve rod; therefore, the full-automatic cutting machine has a wide application prospect.

The method comprises: using a repeater coupled-to/integrated-in a location assistant function (LAF) unit as the location assistant device; the network side of the location system can either get TDOA (the time difference of arrival) corresponding to the pilot frequency signal from base station and the TDOA corresponding to the pilot frequency signal of the base station through the repeater, and or get the TDOA corresponding to the pilot frequency signal of LAF unit in the location apparatus; it uses the TDOA corresponding to the pilot frequency of LAF unit and the parameter information of the repeater predetermined at network to abandon the TDOA corresponding to the pilot frequency signals from base station through the repeater, and uses the rest TDOA-namely the TDOA corresponding to the pilot frequency signals from base station and the TDOA corresponding to the pilot frequency signals from LAF unit to make location calculation for the mobile station.

The invention discloses an environment self-adaption multi-target direct locating method which comprises that a locating center first performs grid point division on a location area and assembles point coordinates into a set; then an ideal dictionary pre-established according to a known base station and the point coordinates; the locating center utilizes two steps of an off-line dictionary study method and on-line dictionary study method to dynamically adjust the ideal dictionary and enables the ideal dictionary to be adapted to dynamic change of signal environments, furthermore, loose signals are reconstructed, the grid point position corresponding to a non-zero value in a sparse vector is the determined position of a moving terminal, and the number of the non-zero value is the number of the targets to be located. According to the environment self-adaption multi-target direct locating method, feature parameters of signal delay, angles, strength and the like do not need to be estimated. Due to the fact that the two-step dictionary study methods can enable the ideal dictionary to be adapted to the environments, high locating precision can be obtained, and simultaneously, the method does not need to let a user know the number of the targets to be located in advance.

The invention provides a vector arc stage switching method and device for double rotary balance mass-based dynamic magnetic steel type magnetic levitation workpiece stages, and belongs to a semiconductor manufacturing equipment technology. The device comprises a support frame, a balance mass block, a rotating shaft, magnetic levitation workpiece stages, a workpiece stage measurement device and a workpiece stage drive device, wherein the two workpiece stages work between a measurement station and an exposure station; the positions of the workpiece stages are measured by plane gratings; the workpiece stages are driven by magnetic levitation planar motors; and the two workpiece stages are driven by the planar motors to achieve single-beat arc fast stage switching in the double workpiece stage switching process. According to the vector arc stage switching method and device, the problems that an existing stage switching scheme has multiple beats, a long track, multiple starting and stopping beats, long stabilization time and the like are solved; the stage switching link is reduced; the stage switching time is shortened; and the productivity of a lithography machine is improved.

The invention provides an indoor pseudo-satellite differential relative positioning method. A local coordinate system is established in a world coordinate system by using a base station receiver as the origin of coordinates, and the actual position of a user is calculated through formula calculation. The indoor pseudo-satellite differential relative positioning method has the advantages that iterative operation is not required, the risk of engineering implementation is reduced, the indoor pseudo-satellite differential relative positioning method is a feasible practical technology, and is a new differential relative positioning method applicable to indoor pseudo-satellite positioning, the influence of the clock difference between a pseudo-satellite and a user receiver on positioning accuracy in the indoor pseudo-satellite positioning process is effectively eliminated, and positioning accuracy of indoor pseudo-satellite positioning is greatly improved. In addition, compared with an existing conventional differential relative positioning method, the indoor pseudo-satellite differential relative positioning method has the advantages that the calculated amount is not greatly increased, and engineering implementation is easy.

The invention discloses an acoustic emission source positioning method and system based on a linear weighted least square method. The method comprises the following steps: 1) obtaining a mean value reference equation according to a distance time equation between each sensor and an acoustic emission source; 2) obtaining a linear equation set based on the average reference equation; 3) based on thelinear equation set, calculating common least square solutions V (1) and K (1) of intermediate variables V and K so as to estimate a covariance matrix psi of the linear equation; 4) acquiring a weightmatrix W according to the psi, and calculating weighted least square solutions theta (2) and K (2) of acoustic emission source coordinates theta and K expressed by V; 5) substituting theta (2) and K(2) into the mean value reference equation to obtain a unary cubic equation about the V; and 6) solving the unary cubic equation, taking a root closest to V (1) as a V closed-form solution V (2), andsubstituting into theta (2) to obtain a final acoustic emission source coordinate. In the invention, positioning precision is high.

The invention relates to a high-precision indoor positioning method for WiFi signal direct line-of-sight propagation path mining. The method comprises the following steps: collecting channel state information and signal strength of WiFi signals through commercial WiFi equipment; estimating an arrival angle of a propagation path from the positioning target to the WiFi access point; identifying a direct propagation path between a positioning target and a WiFi access point by using embedded representation, and weighting and designing a positioning loss function. The beneficial effects of the method are that the method employs the WiFi devices which serve wireless network communication and are widely deployed to serve indoor positioning at the same time, and eliminates the impact on the positioning precision from a wireless signal multipath effect and noise interference in an indoor complex environment. The method comprises the following steps: capturing channel state information of commercial WiFi in an indoor environment, and decomposing arrival angles and flight time of different multipath components of the target signal arriving at a plurality of WiFi access devices by using the channel state information; therefore, centimeter-level high-precision indoor positioning with zero deployment cost is realized.

The invention discloses a double-end ranging method capable of eliminating the influence of wave velocities. According to the method, the time difference of the arrival of fault trip waveforms to a double-end ranging device and the time difference of the arrival of relay protection closing waveforms to the double-end ranging device are measured, multivariate equations concerning fault positions, traveling wave velocities and line lengths are established, and a fault location is solved according to the equation set; a fitting intersection algorithm is adopted for fault wave header recognition,the precise time of wave headers at two ends is calculated, such kind of algorithm is not affected by a wavelet basis function and decomposition scale and has high adaptability compared with a traditional algorithm in which a double-ended fault location device uses wavelet transformation to obtain a modulus maximum value. Compared with a traditional double-ended traveling wave fault location method which adopts fault tripping waveforms to realize fault location and ranging, the method of the present invention eliminates fault location errors caused by line impedance, traveling wave velocities,line sag and the like, and improves fault location accuracy.

The embodiment of the invention provides a fastener positioning method and device and a readable storage medium, and the method comprises the steps: carrying out the preprocessing of an obtained imagecomprising a to-be-positioned fastener, and obtaining a corresponding edge region image; wherein a plurality of connected regions contained in the edge region image form a first region set; removingdominant noise and dominant interference regions in the first region set based on the shape features of each region in the first region set and the edge region features of the steel rails and the sleepers to form a second region set; based on the shape feature of each region in the second region set and the relative position feature between the regions, obtaining the linear position of the edge ofthe steel rail; based on the shape feature of each region in the second region set, the relative position feature between the regions and the steel rail edge linear position, obtaining the sleeper edge linear position; and obtaining a fastener position based on the steel rail edge linear position and the sleeper edge linear position. The method is high in positioning precision, simple in processing process, small in calculation amount and suitable for detection environments of various speeds.

The invention discloses a bluetooth indoor micro-positioning system based on an ELMAN neural network. The system comprises a system host, a bluetooth anchoring point and a positioning target, the system host comprises an embedded processor, a bluetooth main node and a communication module, the bluetooth main node (main node bluetooth module) adopts a low-power-consumption bluetooth wireless data transmission module RL-CC2541-S3, a SIM900A is used for communication with a host computer, a CC2541 acquires a host signal intensity indication required by positioning, one bluetooth module is fixed on the positioning target, the system host and the bluetooth anchoring point are arranged in a positioned indoor area, the bluetooth module fixed on the positioning target operates in a host mode, andthe bluetooth main node and the bluetooth anchoring point operate in a slave mode. According to the system, the precision and the stability of the positioning technology are improved, certain adaptability to the environment is achieved, and technical support is provided for implementation of a complex positioning algorithm.

The invention provides a gravity-removing positioning method and a positioning clamp for a contactor with an L-shaped mounting frame. According to the method, the bottom surface of the to-be-edge-sealed contactor with the L-shaped mounting frame is suspended when the to-be-edge-sealed contactor is positioned, and the welding surface formed after a housing is matched with a base is directly positioned, so that the precision of the laser focal length in the welding process is improved. The influence of welding deformation of the mounting frame and the contactor housing on the positioning precision is eliminated, and precise positioning is ensured. The deviation range of the positioning precision is 0.01-0.04 mm, and the positioning precision is improved by more than 10 times.

The invention provides a method for synchronously adjusting the balance of a transverse beam of a numerical-control gantry machine tool with the movable beam. The method has the advantages that the pressure of an oil cylinder is linearly adjusted via an electro-hydraulic proportional valve, and a Y-axis sectioned compensation mode is adopted, so that the pressure which is applied by a ram milling head to the oil cylinder is gradually compensated when the ram milling head moves on the transverse beam, the balance of the transverse beam can be synchronously and stably adjusted, pressure impact is prevented, the transverse beam movement positioning precision is unaffected by gravitational unbalance loading caused by the fact that the ram milling head moves along the transverse beam, the transverse beam can run stably, and a phenomenon of out-of-tolerance of inclination can be effectively prevented.