1078results about How to "High positioning accuracy" patented technology

A rotating irradiation apparatus includes a rotating gantry 3 including a front ring 19 and a rear ring 20 and is provided with a beam delivery device 11 and an irradiation device 4. The beam delivery device 11 delivers an ion beam used for particle radiotherapy. Radial support devices 61A and 61B support the front ring 19 and radial support devices 61A and 61B support the rear ring 20. Each radial support device includes a linear guide 41, an upper support structure disposed above the linear guide 41, and a lower support structure disposed below the linear guide 41. The upper support structure is movably mounted on the lower support structure and is movable in the direction of the rotational axis of the rotating gantry 3.

The invention discloses a method and a device for personal location based on motion measurement information. The invention calculates motion distance and direction and finally determines the current location of an operational staff by measuring the motion state of the operational staff and according to motion types and motion models; and at the same time, the invention combines the motion models with a GPS so as to use the GPS to revise location errors and model parameter errors. The invention overcomes the defect that the traditional navigation locator can not realize location when the GPS signals are deficient and has higher location accuracy. The device of the invention has the technical characteristics of being light and portable and having strong anti-interference performance, higher reliability and higher accuracy.

The invention is applicable to the field of mobile terminals and provides a locating method, a locating system and a mobile terminal. The method comprises the steps as follows: carrying out coarse positioning in a wireless locating manner, and obtaining a region where the mobile terminal is located; downloading a map close to the region where the mobile terminal is located; starting up a camera of the mobile terminal and obtaining images around the mobile terminal; and matching the obtained images around the mobile terminal with the map close to the region where the mobile terminal is located, and determining the accurate position of the mobile terminal. According to the invention, the locating precision is improved to a range within 5 m.

The invention relates to an industrial robot measurement method based on a tail end numbered tool. The method specifically includes the following steps that the overall arrangement of a work space is conducted, and the number tool and other devices are installed and fixed; a binocular CCD camera is calibrated, and a tool pre-calibration database is established; a DH kinematic model is updated so that the theoretical pose of a tool frame can be obtained; the images of numbered points are collected, and data processing is performed so that coordinate values can be obtained; coordinates are converted into a robot base frame from a camera frame; the position of the tool center and the posture of the tool frame are obtained according to captured point coordinates; as is verified in an experiment, positioning precision is improved. The measurement method solves the problem that a traditional vision system is narrow in positioning and tracing view field, effectively improves the positioning precision of the behaviors of the robot, has the advantages of being simple, reliable and efficient and reduces the cost for measuring the tail end pose of the robot.

A method and system for improving accuracy of a position correction data in a differential global positioning system (DGPS) using vehicle to vehicle (V2V) communication, capable of correcting a DGPS data received from a road side unit (RSU) into information calculated by a sensor, and providing neighbouring vehicles with the corrected value as the DGPS data using the V2V communication, are provided.

The invention provides a UWB-based vehicle positioning system and method. The positioning system comprises a UWB electronic label arranged on a vehicle; a plurality of UWB base stations arranged in a parking area at intervals; and a processing apparatus used for determining position information of the vehicle according to parameter values from at least three UWB base stations. The positioning method comprises the following steps: receiving clock synchronization signals emitted by a synchronization signal emission device, and synchronizing a synchronization clock in real time; receiving wireless positioning signals emitted by the UWB electronic label carried by the vehicle entering the parking area; and after the wireless positioning signals are received, according to the synchronization clock, generating receiving time, sending the receiving time to the processing apparatus so as to enable the processing apparatus to calculate the position of the vehicle according to the receiving time of the same wireless positioning signals respectively received by the at least three UWB base stations. The system and method have the advantages of high positioning precision, good stability and the like.

The invention discloses an automatic calibration system of the diameter of a vehicle wheel based on satellite positioning, and a method thereof. The system of the invention comprises five modules and a map database, wherein, the map database is used for storing relevant information of train operation lines; the five modules are respectively a positioning module, a map matching module, a data recording module, a communication module and a main processor. By introducing a satellite positioning technology, the automatic calibration of the diameter of the vehicle wheel in a positioning system is realized by GNSS positioning information so as to reduce positioning errors caused by the diameter change of the wheel due to the wheel wear, thereby improving the precision of the train positioning.

The invention provides a method of conducting target location based on a mobile terminal. The method comprises the following steps: S1. figuring and getting distance between a target object and the mobile terminal based on a photography distance measure principle, S2. obtaining location information of the mobile terminal and azimuth information of the target object relative to the mobile terminal, S3. and locating location information of the target object by combining the distance between the target object and the mobile terminal with the location information of the mobile terminal and the azimuth information of the target object relative to the mobile terminal, wherein the distance between the target object and the mobile terminal is achieved from step S1 and the location information of the mobile terminal and the azimuth information of the target object relative to the mobile terminal are achieved from step S2. Positioning of the target object is achieved fast, timely, accurately and simply.

The invention discloses an identification and compensation method of an industrial robot structure parameter bias, which includes steps of confirming compensable structure parameter bias according to a numerical control system of an industrial robot; setting up a bias model on the basis of a DH method, compulsorily zeroing the non-compensable structure parameter bias in a bias model, and then structuring a bias identification equation; selecting an identification pose, and controlling the industrial robot to move according to the identification pose; recording a joint turning angle and the terminal position data of the industrial robot; calculating the bias identification equation according to the a joint turning angle and the terminal position data, and solving the bias identification equation to obtain the structure parameter bias; modifying a corresponding structure parameter in the numerical control system of the industrial robot according to the structure parameter bias so as to compensate the structure parameter bias. The identification and compensation method has the advantages of identifying and compensating the reduction ratio bias, coupling parameter bias and DH parameter bias of the industrial robot, and reaching higher positioning precision in compensation of the bias.

The invention relates to a system and a method for detecting high voltage transmission line faults. The system is provided with a fault analysis server and a detection device arranged on a three-phase high voltage transmission line, wherein the detection device consists of a first detection point device and two second detection point devices, the first detection point device is arranged on a B phase line, the second detection point devices are respectively arranged on an A phase line and a C phase line and transmit the detected data to the first detection point device, and the first detection point device transmits all of the detected data and the data transmitted by the second detection point devices to the fault analysis server. The method comprises the following steps of: arranging N detection points on one line, installing the detection device and synchronizing the time of each monitoring point; receiving monitored data of current, field intensity and temperature at any time transmitted by each detection device by the fault analysis server and carrying out statistic analysis. The invention can confirm the fault point of the high voltage transmission line in time, greatly improves the labor efficiency, and shortens the fault-checking time.

The invention relates to a production method of a chassis of a railway vehicle, which comprises the following steps: opening an end beam positioning and clamping device, a side beam positioning and clamping device, a transverse centering device and a body bolster clamping device to the open positions; hoisting a side beam and an end traction and bolster mechanism in place; enabling the transversecentering device to act so as to center a traction beam; starting the end beam positioning and clamping device, and fixing an end beam in place and clamping; starting the body bolster clamping device; placing cross beams inside and outside a bolster; mounting a wire slot at the end part and the wire slot in the bolster; welding a cross beam downhand weld and a vertical weld, and welding a cover plate on a body bolster; retreating the end beam positioning and clamping device, the side beam positioning and clamping device, the transverse centering device and the body bolster clamping device; and using a clamping fixture for clamping. The lower planes of two upper center plates of an end traction and bolster and the lower plane of the end beam are fixed as reference for positioning the height of the end traction and bolster of the chassis, and positioning pins at center holes of the upper center plates and the transverse centering device are used for transverse positioning. The positioning way is reasonable, the artificial marking is not required, the positioning precision is high, and the production efficiency is high.

The invention provides a location method of a partial discharge fault source of a transformer, comprising the following steps: detecting radio-frequency signals generated by a partial discharge source in the transformer by a plurality of sensor modules, and recording the initial time at which a plurality of radio-frequency signals are detected; determining the measured time delay parameters of the radio-frequency signals according to the plurality of the initial time; setting wave speed parameters of the radio-frequency signals; making use of the space mesh division method to search and obtain the location of the partial discharge source according to the measured time delay parameters and the wave speed parameters. In the prior art, the time difference method is very sensitive to parameter errors generated in the transformer actual measurement process, and even tiny parameter errors can lead to problems like method failure or over-great location errors. The method in the invention overcomes the above problems.

The magnetic tape includes a non-magnetic support; and a magnetic layer including a ferromagnetic powder and a binding agent on the non-magnetic support, in which the magnetic layer has a timing-based servo pattern, a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 1.8 nm, and an isoelectric point of a surface zeta potential of the magnetic layer is equal to or greater than 5.5.

The invention discloses an electronic fence based on a real-time geographic position. A system truly restores effects of the electronic fence in a computer based on a geographic information system, and information relevant to positioning is acquired by handheld terminal equipment efficiently in a multipath manner. A monitored object transmits the information to a server in a time interval, the server positions the monitored object through mixed positioning and judges whether the monitored object triggers a fence event to decide to transmit alarm information to a monitor, so that efficient monitoring management is achieved.

An insertion system with a self-expanding braided stent (11) for implantation in a blood vessel has an outer sleeve (12) with a distal end (14) and a proximal end. An inner sleeve (16) arranged in the outer sleeve (12) is displaceable relative to the latter and protrudes, with a handling section, from the proximal end of the outer sleeve (12). Moreover, at the distal end (15), there is a tip (18) which is securely connected to a stent support (24) on which the braided stent (11) is arranged in its loaded state. The stent support (24) is arranged to be displaceable relative to the inner sleeve (16).

The invention discloses a method for precise positioning of a license plate in strong light conditions. The method comprises the following steps: (1) using the picture of a license plate to be processed to conduct preprocessing by self-adaptive median filtering; (2) using a differential operator to conduct edge detection of the license plate; (3) converting an image after the edge detection to a binary edge image; (4) de-nosing the binary edge image in a morphological manner and forming a plurality of communicated regions; (5) performing morphological processing on the communicated regions; and (6) positioning the region of the license plate according to the results of the communicated regions. The method for precise positioning of a license plate in strong light conditions can effectively solve the problem of interference to the positioning of the license plate under irradiation of strong light, enable the positioning accuracy to be improved, and is applicable for extracting license plates of passing vehicles from pictures taken at places such as a flowing speed measurement point or a crossroad.

The invention provides a positioning method. The positioning method is characterized by comprising enabling a terminal to be positioned to issue a positioning request; according to the positioning request, obtaining signal transmission data among the terminal to be positioned, a reference tag and multiple base stations; computing the estimated coordinate of the terminal to be positioned according obtained signals, performing multiple iterative convergence on the estimated coordinate to obtain the position coordinate of the terminal to be positioned. The positioning method can effectively improve the positioning precision. The invention also provides a positioning system.

The invention discloses a target location method for MIMO radar (multi input multi output), for resolving the low accuracy problem of the prior MIMO radar which locates target via least square method. The invention utilizes the error correlation character of the coefficient matrix and utilizes constraint total least square method to realize target location. The method comprises the steps of emitting orthogonal signals for each transmitter distanced with each other enough, at the receiver, using the orthogonality of the emitted signals and a match filter method to separate the echo signals of emission array elements; using each receiver to measure the direction of the target echo to attain the object angle; using the constraint total least square method to realize the accurate location of the target. The invention has the advantages of high location accuracy and can locate air target in tracking and guidance.

The invention discloses a three-dimensional wireless sensor network node self-locating method based on a neural network. The three-dimensional wireless sensor network node self-locating method comprises the following steps that firstly initializing a wireless sensor network, secondly establishing a neural network, thirdly extracting training examples for the neural network, fourthly training the neural network through the obtained training examples, fifthly obtaining the actual distance from each unknown node to an anchor node which is not adjacent to the unknown node according to the well-trained neural network, and sixthly obtaining the three-dimensional coordinates of the known node. The obtaining method of the training examples is simple and has strong representative, and the well-trained neural network can better represent the main properties of a geometric structure of the three-dimensional wireless sensor network. The three-dimensional wireless sensor network node self-locating method solves the problem of overlarge estimation error of distance brought by the accumulation system of shortest jumping distances in the locating process of the three-dimensional wireless sensor, and effectively improves the locating precision.

The invention relates to an unmanned vehicle positioning algorithm based on a three-dimensional laser radar. The unmanned vehicle positioning algorithm includes the following steps: 1. extracting road edge feature points from a single frame of laser point cloud data, and according to a vehicle kinematic model, converting multiple frames of detected road edge feature point coordinates into a current vehicle coordinate system; 2. utilizing a Beam model method to extract the outlines of the multiple frames of road edge feature points; and 3. matching the road edge outline extracted in the Step 2 with high-precision map data, calculating lateral, longitudinal and course angle deviations of a current vehicle as observation values, and inputting the observation values into Kalman filters to perform vehicle pose estimation. Long-time long-distance stable positioning of the vehicle can be guaranteed. The method is applicable to various laser sensors, and can also obtain relatively high positioning accuracy. Abnormal points can be effectively removed, so that map matching is more accurate, and positioning accuracy is higher.

The invention relates to a multi-target three-dimensional ultrasonic tracking positioning system and method, in particular to an ultrasonic propagation time delay TOA multi-target three-dimensional ultrasonic tracking positioning system and method using infrared signals as time base. The positioning system comprises a transmitting component, a receiving component and a signal processing and displaying component. The positioning method uses the infrared signals as the time base, distinguishing of multiple targets are achieved through frequency division multiplexing of the infrared signals and ultrasonic signals, a wave trap circuit is combined with a digital filter to separated the ultrasonic signals of different targets, automatic gain is used to complete far-near positioning seamless switching of the targets, and high-precision multi-target ultrasonic tracking positioning is achieved. The system and method has the advantages that no interference occurs among the multiple targets, and the system and method is high in precision, simple in network protocol, simple and efficient in algorithm, and widely applicable to small and portable embedded equipment in fields such as education, entertainment and medical treatment.

The invention discloses a single-satellite interference source positioning method based on a satellite-borne multi-wave-beam antenna. The method comprises the following steps that an antenna directional pattern model of each wave beam of the satellite-borne multi-wave-beam antenna is built, the antenna gain is correlated with the geographical position, and an antenna directional pattern geographical model is constructed; a ground station receives satellite transfer signals and carries out real-time monitoring, when the interference is monitored, the main interfered wave beams and adjacent common-frequency wave beams are determined, in addition, the interference signal parameters are cognized, the signal intensity of the interference signals in other adjacent common-frequency wave beams is measured according to the cognizing results, and the space distribution of the interference signal intensity in multi-wave-beam environment is obtained; a positioning equation set formed by the interference source position, the interference signal intensity and the antenna directional pattern gain function is built through combining the space distribution of the interference signal intensity and the antenna directional pattern geographical model, and the interference source positioning result is obtained. When the single-satellite interference source positioning method provided by the invention is adopted, the additional addition of satellite-borne equipment is not needed, the realization is simple, and in addition, the positioning precision is higher.

The invention discloses a positioning method based on a WiFi wireless network. The positioning method comprises offline stage processing and online stage processing. The offline stage processing is that signal intensity of reference points is acquired and stored in a database so that a fingerprint database is acquired. The online stage processing is that weight is arranged according to instability of WiFi signal intensity, candidate ranges are limited according to moving tracks of moving objects, and positions of the moving objects are confirmed in combination with the fingerprint database. When the moving objects are positioned, instability of WiFi signal intensity and the moving tracks of the moving objects are fully considered so that a problem of low positioning accuracy caused by instability of WiFi signal intensity is solved, and thus positioning accuracy is enhanced.

The invention provides a combined navigation method applicable to an unmanned aerial vehicle in a glide landing stage, and aims to provide a combined navigation method which is low in cost and simple in engineering implementation. According to the technical scheme, the method comprises the following steps of: (1) in an airport for glide test or flying, inputting a precise positioning measurement data point serving as reference data into calculation software of a differential global positioning system (GPS) ground station; (2) when an onboard differential GPS antenna receives GPS signals of three or more satellites, intersecting a position information coordinate of the unmanned aerial vehicle by the onboard differential GPS antenna, correcting the coordinate information of the unmanned aerial vehicle, which is measured by the onboard differential GPS antenna in real time, according to pseudo-range information emitted by the differential GPS ground station in real time, and eliminating a common error; and (3) sending the corrected coordinate information of the real-time position of the unmanned aerial vehicle to an independent inertia navigation system on an airplane through an RS232 signal, correcting state data such as the position, the speed and the attitude angle of the airplane, which are measured by the inertia navigation system in real time, by the inertia navigation system, sending the precise position information to a flying control computer through RS422, and performing precise control over glide landing of the airplane.

The invention relates to a data processing technology of petroleum geophysical prospecting, in particular to a secondary positioning method for a submarine cable based on surface fitting, which comprises the following steps: obtaining a practical first arrival time by using a picking method, calculating the theoretical shot-geophone distance from an acceptance point to each shot point, carrying out surface fitting, calculating the shot-geophone distance by using geophone positions as midpoints to carry out meshing, calculating the theoretical time from a grid node to the shot point, calculating the sum of squares of the difference between the time from a grid node to the shot point and the corresponding first arrival time to serve as the error value of the grid node, composing coordinates of all the grid nodes and corresponding node error values into a cubic polynomial for space splattering so as to fit a cubic surface, and calculating the point-coordinate position of the minimum value on the surface. Under the premise of improving the positioning accuracy, the calculation efficiency is greatly increased by almost 1.6 times compared with the grid scanning algorithm and by almost 8 times compared with the first-arrival circular positioning efficiency.

The invention provides a keyless system positioning method based on a Bluetooth RSSI. The keyless system positioning method is characterized by comprising the following steps: firstly, initially judging whether a key is in or outside a car; establishing a car interior and exterior space coordinate system, setting up four base stations, separately installing the four base stations in the centers of four sides of the car, and when an intelligent key of the car receives signal strengths sent by the four base stations, sequentially comparing each strength to judge which quadrant the key is located; calculating the distances from the key to the four base stations according to the signal strengths and an in-car attenuation model, and further judging whether the key is in or outside the car; obtaining the corrected distances from the key to the four base stations by using an in-car attenuation neural network model or a free space attenuation model according to whether the key is in or outside the car; and then positioning the location of the key by using a twice-weighted centroid sectional positioning algorithm. By adopting the method provided by the invention, the positioning accuracy of the intelligent car key can be greatly improved.

The invention provides a positioning method, device and system for a Beidou navigation system. The method includes the steps of S1, obtaining a first pseudorange between the device and an observation satellite; S2, receiving first ephemeris data transmitted by the observation satellite; S3, receiving pseudorange difference revised data, transmitted by a difference reference station data processing center, of the observation satellite, wherein the pseudorange difference revised data further comprise the age of second ephemeris data, received by the difference reference station data processing center, of the observation satellite; S4, judging whether the age of the second ephemeris data is matched with the age of the first ephemeris data or not; S5, revising the first pseudorange according to the pseudorange difference revised data so as to obtain a second pseudorange if the age of the second ephemeris data is matched with the age of the first ephemeris data; S6, obtaining a first coordinate position according to the second pseudorange and the first ephemeris data. By means of the method, the positioning accuracy can be improved.

The invention discloses a wireless location method for directly estimating and eliminating non-line-of-sight (NLOS) error influence. The method comprises the following steps: firstly establishing a motion equation and an observation equation for wireless location, and then identifying that the current measured value is a line-of-sight (LOS) situation or an NLOS situation by virtue of innovation sum of squares of an extended kalman filter (EKF); for the LOS situation, carrying out position calculation and motion state estimation by directly utilizing the EKF; and for the NLOS situation, directly estimating the NLOS error by a nonlinear optimization method based on a geometrical relationship limiting condition, then eliminating the NLOS error by utilizing the corrected EKF, and carrying out high-precision location; and finally realizing online tracking of a mobile station by means of cyclical iteration. The wireless location method has the beneficial effects that influence of the NLOS error in wireless location can be effectively eliminated and location accuracy is obviously improved; and meanwhile prior statistical knowledge of the known NLOS error and LOS/NLOS transition probability are not required in the method, and calculation quantity meets the requirements for real-time application.

The invention discloses a gas transmission pipeline leakage detection system based on an acoustic method. The gas transmission pipeline leakage detection system comprises a user terminal, a cloud server and a plurality of detection sections, wherein the detection sections are arranged along a gas transmission pipeline; two low-frequency acoustic wave sensors, two temperature sensors, two density sensors, two pressure sensors and two digital network transmission instruments are arranged in each detection section. The gas transmission pipeline leakage detection system is high in real-time performance, high in sensitivity, high in adaptability, short in response time and high in positioning accuracy, and is capable of achieving all-day, real-time and different-area detection, positioning leakage positions and determining diameter size and shape of leakage holes.

The invention discloses an indoor positioning system based on LED lamps. The system comprises the LED lamps, a server and handheld equipment. Each LED lamp has the unique coding and flicker frequency, the coding and flicker frequencies of the LED lamps are stored in the server, a positioning regional map is stored in the server, and the handheld equipment receives light emitted by the LED lamps, converts optical signals into flicker frequency signals of the LED lamps and obtains position information of the LED lamps corresponding to the flicker frequency signals. Signal propagation is achieved through the flicker frequencies of the LED lamps, an optical flame detector is adopted to collect the flicker frequency information of the LED lamps, the indoor precise positioning is achieved through map information prestored in the server, the positioning precision is high, the current position can be precisely positioned, the accuracy can reach within two meters, and the system is suitable for precise positioning of indoor large markets, interiors of buildings, underground markets, underground parking lots and the like.