31results about How to "Solve the problem of large positioning errors" patented technology

The invention relates to a wireless sensor network node positioning method based on time reversal, comprising the steps of: 1, sending a request impact signal to a reference node by an unknown node and recording initial time; 2, receiving and reversing by the reference node and sending a reversal multi-path request impact signal to the unknown node; 3, receiving a focusing-arrived reversal multi-path request impact signal by the unknown node and recording receiving time at the moment; 4, calculating the distance away from the reference node by the unknown node according to the initial time and the receiving time; 5, repeating the step 1 to the step 4 until the distances from the unknown node to any three reference nodes are calculated; and 6, calculating coordinates of the unknown node according to the distances from the unknown node to any three reference nodes to complete the positioning of the unknown node. The invention has the benefits of solving the problem of large traditional TOA (Time Of Arrival) positioning errors under a complex environment and ensuring that the system positioning error is less than the working wavelength.

The invention discloses a non-linear constrained least square-based single station positioning method. The method comprises the steps of first, building an NLOS signal transmission model of a macro cell single base station according to a signal transmission characteristic of a macro cell; then, converting a positioning problem into a non-linear constraint least square problem by using a position relationship among a multi-path signal parameter, a base station, a target and a scatterer; resolving the least square problem by using an LM (Levenberg-Marquardt) algorithm; and when a residual is large, introducing an aquasi-Newton algorithm, and improving the LM algorithm so as to obtain a target estimation position. The method solves a problem that a traditional positioning algorithm depends on the number of base stations, performs positioning by using a single base station, does not need clock synchronization, and lowers the algorithm complexity; in the NLOS environment, the multi-path signal is used as a positioning path but does not suppress multiple paths, so that a problem of large positioning error in the NLOS environment is solved; the variable constraints are increased by using a ring model, so that the least square method is more effective, and the single station positioning of the macro cell reaches the positioning accuracy of 20-30 meters.

The invention discloses a glass fiber reinforced plastic acoustic emission source triangulation location method. According to the technical scheme, the method comprises the steps that 1, to-be-measured glass fiber reinforced plastic angle-speed polynomial is subjected to fitting; 2, sensor probes are arranged on a glass fiber reinforced plastic tank to be measured according to an isosceles triangle arrangement method; 3, coordinates of three vertexes of an isosceles triangle are set; 4, location results are obtained through operation. The glass fiber reinforced plastic acoustic emission source triangulation location method has the advantages that the problem that for the acoustic emission detection mode of the composite material of glass fiber reinforced plastic, the propagation speeds in different directions are different due to material anisotropy, and a location error is big is solved; the whole method is simple and easy to operate, and complex artificial operation can be replaced by means of curve fitting in an Excel table; the final measurement results are accurate.

The invention provides an improved wireless sensor network node positioning algorithm based on DV-Hop. A weighted least square method and an optimal reference node method are imported. The algorithm comprises the following steps: step 1: initializing a wireless sensor network, step 2: Calculating, by a reference node, an average hop distance, step 3: listing a distance equation set; step 4: optimizing an equation solution; and step 5: selecting the optimal solution. The improved wireless sensor network node positioning algorithm provided by the invention is improved on the basis of the existing DV-Hop positioning method, the weighted least square method and the optimal reference node method are imported into the method to adapt to irregular network topology in practical application, and the node positioning accuracy is effectively improved.

The invention provides a method and device for positioning a user terminal. The method includes the steps that the position value of one set of single-point positioning equipment within a preset distance is obtained through the user terminal, or the position values of multiple sets of single-point positioning equipment beyond the preset distance are obtained through the user terminal; the user terminal is positioned by itself according to the obtained position value of the single-point positioning equipment. The device comprises an obtaining module and a positioning module. The obtaining module is used for obtaining the position value of one set of single-point positioning equipment within the preset distance or the position values of the sets of single-point positioning equipment beyond the preset distance. The positioning module is used for positioning the user terminal according to the position values of the single-point positioning equipment. The problem that a WiFi cooperative positioning technology is large in positioning error is solved, the requirement for positioning precision of a user is met, and the user terminal is accurately positioned.

The invention discloses an inertial navigation system and method. On the basis of a neural network assisted opportunity signal / inertial navigation module, an indoor space is positioned and navigated,positioning accuracy can be improved under a situation that a satellite signal is good, in addition, a high-accuracy indoor positioning result can be provided under an indoor satellite signal denialcondition, neural network assisted data fusion is adopted, the problem of big positioning errors since opportunity signals are incompatible when different opportunity signals are used for positioningcan be solved, the reliability and the safety of the inertial navigation system can be improved, all modules of the inertial navigation system independently work and do not mutually affect, and the stability and the anti-interference performance of the inertial navigation system can be improved.

The invention discloses a partial discharge location method, device and system. The partial discharge location method includes: collecting the partial discharge signal of the partial discharge source induced by the UHF antenna array; determining the position measurement value according to the partial discharge signal; and performing error compensation on the position measurement value according to the preset error compensation model to obtain the position correction value, where the location measurement is the measurement of the location of the partial discharge source. The present invention solves the problem of relatively large positioning errors for partial discharges in the positioning method in the related art.

The invention discloses an improved emergency position indication radio beacon, which is used for emergency rescue of ship at sea. The whole improved emergency position indication radio beacon comprises a communication module, a global positioning system (GPS) module and a Beidou satellite positioning module, which are connected with a central processing unit (CPU) master control module, and a power supply module. When a ship distress device breaks away from the ship, the emergency position indication radio beacon can automatically acquire precise position information through the GPS module and the Beidou satellite positioning module, and the CPU master control module controls the communication module to transmit a distress signal. The communication module sends an alarm message in a 406MHz satellite communication frequency band and sends the distress signal. The Beidou satellite positioning module can send an alarm signal through a short message communication alarm function of a Beidou system. Due to the arrangement of the GPS module and the Beidou satellite positioning module, the positioning precision is improved. As the improved emergency position indication radio beacon integrates multiple alarming methods, rescue ships or airplanes can find the ship in distress rapidly, and the rescue speed is improved.

The invention discloses a camera calibration method suitable for driving equipment, and the method comprises the following steps: carrying out the external parameter calibration of a camera when the driving equipment is in a first load state, and obtaining first calibration information, wherein the first calibration information comprises a first coordinate conversion relation between a navigation environment coordinate system and a camera coordinate system in the first load state; when the driving equipment is in a second load state, performing external parameter calibration on the camera to obtain second calibration information, the second calibration information comprising a second coordinate conversion relation between the navigation environment coordinate system and the camera coordinate system in the second load state, and loads in the first load state and the second load state being different; and obtaining adaptive external parameters of the camera according to the first calibration information and the second calibration information. By adopting the technical scheme, the positioning precision of the camera is improved. The invention further provides a camera calibration system suitable for the driving equipment and computing equipment.

The invention discloses an underwater wireless sensor network positioning algorithm based on mobility prediction. The algorithm introduces an improved backtracking search optimization algorithm on thebasis of a conventional mobility prediction positioning method. The algorithm adopts three sensor nodes, namely a buoy node, an anchor node and an unknown node. The algorithm comprises the followingsteps of: (1) initializing a wireless sensor network; (2) positioning anchor nodes; (3) calculating anchor node speed information; (4) calculating unknown node speed information; and (5) positioning unknown nodes. The algorithm can adapt to the underwater wireless sensor network in practical application. The node positioning precision is effectively improved, and the calculation overhead is reduced.

The invention provides a non-salient pole generator stator single-phase earth fault positioning method and device, belongs to the field of electrical engineering, and is used for improving fault positioning precision. The method comprises the steps: obtaining the parameter values of ground capacitance and transition resistance of a non-salient pole generator after a fault occurs; based on the parameter values of the ground capacitance and the transition resistance, calculating a fault trajectory circle when each turn of the non-salient pole generator stator winding has a fault; and obtaining the real part and the imaginary part of the zero-sequence voltage of the non-salient pole generator, drawing a zero-sequence voltage trajectory circle according to the real part and the imaginary part of the zero-sequence voltage of the non-salient pole generator, and judging the distance between the zero-sequence voltage trajectory circle and each fault trajectory circle, wherein the number of turns represented by the fault trajectory circle corresponding to the minimum distance is the number of fault turns.

The invention relates to a larger-scale glass steel wind power cabin cover bottom connecting base positioning tool which comprises a tetragonal frame. Mounting plates facing towards the outer side of the frame are arranged in the middle and at the four corners of two sides of the bottom of the frame. Positioning bases facing vertically downwards are arranged in the middle and at the four corners of two sides of the upper end of the frame, and two positioning frames are symmetrically arranged on two sides of the bottom of the frame. According to the larger-scale glass steel wind power cabin cover bottom connecting base positioning tool, the frame is in an integrated structure and is high in mechanical strength, the positioning bases arranged at the upper end of the frame are used for being pressed on a cabin cover die steel frame, the positioning frames on the bottom surface of the frame are opposite to positioning pin sleeves on the bottom surface in the cabin cover, an operator can finely adjust the position, after adjustment is finished, connecting bases are fixed on the plurality of mounting plates arranged at the bottom of the frame, the position of the connecting bases is finely adjusted, so that the connecting bases are integrally pressed on the inner wall of the cabin cover, and the plurality of connecting bases are fixed on the inner wall of the cabin cover by a manually pasting process, so that the problem of big drawing line positioning error is solved, and the larger-scale glass steel wind power cabin cover bottom connecting base positioning tool is accurate in positioning and convenient to assemble.

The invention discloses a scan line positioning method and system for testing a capacitive touch screen. The method comprises that an image of the capacitive touch screen to be tested is obtained; the image of the capacitive touch screen to be tested is enhanced; the enhanced image of the capacitive touch screen to be tested is segmented to obtain image areas included by all scan lines; and the amount of pixels of the image area included by each scan line as well as the position of each position are counted, the length and width of each scan line are obtained, and a concrete position of each scan line in the image of the whole capacitive touch screen is obtained. The system comprises a 2D workbench, a light source module, an image obtaining module and a control unit, and a software part of the control unit includes an image enhancement module, an image segmentation module and a scan line positioning module. According to the method and system, the scan lines are positioned accurately via an image processing technology, and the problem that a positioning error of the scanning lines is relatively high in the prior art is solved.

The invention discloses a positioning method, device and system, which are suitable for scenes such as Internet of Vehicles, networked vehicles, automatic driving and the like, and can solve the problem of low positioning precision of the first terminal equipment due to inapplicability of a reference object. The method comprises the steps that a server receives a first message from the first terminal equipment; wherein the first message comprises first position information determined by the first terminal device. The server determines a first reference object according to the first position information; and the server sends the second message to the first terminal device, wherein the second message comprises identification information of the first reference object, and the identification information of the first reference object is used for updating the first position information by the first terminal equipment. By adopting the method provided by the invention, the positioning precision of the first terminal equipment can be improved.

The invention discloses an RFID antenna production device. The RFID antenna production device comprises an ink-jet printing spray head, a walking control mechanism and a route forming mechanism, wherein the walking control mechanism controls the ink-jet printing spray head to walk according to a set route, and the route forming mechanism is used for fixing and limiting the ink-jet printing spray head. The route forming mechanism comprises a box-shaped frame, a hard template disc detachably fixed to the frame and a route frame fixed to the interior of the frame through a telescopic rod. The RFID antenna production device has the beneficial effects that through the technical scheme, an antenna of an RFID is printed by adopting an ink-jet printing mode, the device can be suitable for antennasin different shapes, and antennas in needed shapes can be printed just by setting printing in a program. Meanwhile, compared with common ink-jet printing devices, a mold plate and the route forming mechanism are arranged above the printing spray head, the problem that the moving error of the spray head of the ink-jet printing device in the prior art is big is solved, therefore the RFID antenna production device can accurately print various types of antennas, is flexible to use and high in universality.

The invention belongs to the technical field of aero-engine production, and relates to a turbine guide vane welding and positioning method, which comprises the following steps: when welding and positioning turbine guide vanes, establishing a three-dimensional rectangular coordinate system, and measuring the minimum distance between two adjacent groups of vanes under equal cylindrical section radiuses; finding a theoretical measurement point corresponding to the minimum distance of the blade, finding a theoretical measurement point at the tail edge under the equal cylindrical section radius, finding an auxiliary positioning point corresponding to the theoretical measurement point, and completing theoretical calculation; when the blade is actually positioned and adjusted, the actual measurement point of the blade is found through the auxiliary positioning point, and then effective coordinate positioning and coordinate system checking can be carried out by comparing two distance difference values between the theoretical measurement point and the actual measurement point; by means of the vector positioning method, the problem that the positioning error is large due to the fact that a corresponding theoretical measuring point cannot be found on the blade outer profile due to blade casting deviation in the actual blade positioning process is solved, and the positioning accuracy is improved.

The invention relates to an accurate positioning device for electrolytic forming of a thin-wall housing. The accurate positioning device comprises a clamping tool used for fixing a workpiece and a positioning device used for positioning a forming electrode, wherein the clamping tool comprises a base mounted on a machine tool workbench; a support is arranged on the base in the vertical direction; an indexing plate used for fixing the workpiece is rotationally arranged at the upper end of the support; an indexing pin used for limiting rotation of the indexing plate is arranged between the indexing plate and the support; the clamping tool further comprises a detachable pressing ring used for clamping the workpiece to the indexing plate; and the positioning device comprises a three-way positioning datum plane on the forming electrode and a three-way positioning block vertically and fixedly arranged on the base. According to the accurate positioning device, the forming electrode integratinga machining profile and a tool setting datum and the permanent three-way tool setting positioning block are adopted, accurate positioning of the forming electrode is achieved, and the problem that the positioning error is large due to the links of assembling, adjusting and the like between the electrode and the workpiece is solved.

The invention relates to an accurate positioning device for electrolytic forming of a thin-wall housing. The accurate positioning device comprises a clamping tool used for fixing a workpiece and a positioning device used for positioning a forming electrode, wherein the clamping tool comprises a base mounted on a machine tool workbench; a support is arranged on the base in the vertical direction; an indexing plate used for fixing the workpiece is rotationally arranged at the upper end of the support; an indexing pin used for limiting rotation of the indexing plate is arranged between the indexing plate and the support; the clamping tool further comprises a detachable pressing ring used for clamping the workpiece to the indexing plate; and the positioning device comprises a three-way positioning datum plane on the forming electrode and a three-way positioning block vertically and fixedly arranged on the base. According to the accurate positioning device, the forming electrode integratinga machining profile and a tool setting datum and the permanent three-way tool setting positioning block are adopted, accurate positioning of the forming electrode is achieved, and the problem that the positioning error is large due to the links of assembling, adjusting and the like between the electrode and the workpiece is solved.

The invention provides a regional position line management system and method, and the system comprises a destination, fixed-point WiFi equipment is arranged around the destination, the fixed-point WiFi equipment is in wireless connection with intelligent terminal equipment and authorized mobile equipment, and the authorized mobile equipment is in wireless connection with line authorization equipment; after the authorized mobile equipment applies for authorization to the line authorization equipment, the line authorization equipment distributes a line to a specified destination to the authorized mobile equipment and the fixed-point WiFi equipment locates and tracks the authorized mobile equipment according to the signal strength between the fixed-point WiFi equipment and the authorized mobile equipment. Meanwhile, the fixed-point WiFi equipment uploads the line and the position of the authorized mobile equipment to the intelligent terminal equipment for line memory tracking; positioning is carried out through WiFi signal intensity, the problem of large positioning error caused by weak satellite signal intensity is solved, and regional position line management of indoor, large industrial areas and resident living quarters is more perfect and convenient.

The invention relates to the technical field of sound source positioning, and discloses a positioning error correction method and device based on microphone arrays, terminal equipment and a storage medium, and the method comprises the steps: obtaining current output signals of a plurality of microphone arrays; classifying the current output signals to obtain a classification result; acquiring a current position relation parameter between the microphone arrays; performing exterior point elimination on each category in the classification result to obtain an elimination result; and performing error correction on the current position relation parameter according to the elimination result. According to the invention, the problem that large errors occur in sound source positioning due to the fact that the current position relation parameters of the microphone arrays are not corrected is solved.

The invention discloses an underwater wireless sensor network positioning algorithm based on mobility prediction. The algorithm introduces an improved backtracking search optimization algorithm on thebasis of a conventional mobility prediction positioning method. The algorithm adopts three sensor nodes, namely a buoy node, an anchor node and an unknown node. The algorithm comprises the followingsteps of: (1) initializing a wireless sensor network; (2) positioning anchor nodes; (3) calculating anchor node speed information; (4) calculating unknown node speed information; and (5) positioning unknown nodes. The algorithm can adapt to the underwater wireless sensor network in practical application. The node positioning precision is effectively improved, and the calculation overhead is reduced.

The invention provides a UWB positioning system-based three-dimensional positioning method and system for a lifting hook of a gantry crane, and belongs to the field of indoor and outdoor accurate positioning. The three-dimensional positioning method comprises the following steps: additionally arranging a movable base station which has a two-dimensional positioning system and a positioned function and a one-dimensional distance measurement function right above a lifting hook of the air crane, wherein the height of the movable base station is fixed relative to the ground; through a positioned function, realizing the two-dimensional positioning on a horizontal plane with a fixed base station based on a UWB two-dimensional positioning system, and acquiring the coordinates of the movable base station in the horizontal plane in real time; measuring the vertical distance between the lifting hook label and the lifting hook label in real time through a one-dimensional distance measurement function, and calculating Z-axis real-time coordinates of the lifting hook; and finally, outputting the accurate three-dimensional real-time positioning coordinates of the lifting hook. By additionally arranging the movable base station, the problems that the base station arrangement number of an existing three-dimensional positioning system is large, the communication network and engineering implementation difficulty is large, and the positioning error of multi-layer cargo stacking is large are solved, the three-dimensional positioning precision of the air crane is improved, and the construction and operation and maintenance cost is reduced.

The invention discloses a high-precision motion single-station direct positioning method based on an arrival angle and Doppler frequency shift. The method comprises the steps of firstly building a target source signal data receiving model comprising the arrival angle and the Doppler frequency shift, and carrying out the data collection of a target source, then constructing a time factor for expanding the dimension of the received signal matrix, constructing a cost function of direct positioning of the moving single station according to the target source data receiving model and the data acquired by the single station for the target source in combination with the mean square error of the position of the target source, and finally, solving the radiation source position by utilizing an MVDR criterion according to the established target cost function. The positioning performance can be improved; for a scene where a plurality of radiation sources need to be positioned, the number of signal sources does not need to be known in advance, and the positioning precision is effectively improved compared with a maximum likelihood method.

The invention discloses a positioning method and system applied to an electronic toll collection system and a storage medium, the electronic toll collection system comprises a vehicle-mounted unit and a roadside unit, the vehicle-mounted unit is arranged on a vehicle, and the positioning method applied to the electronic toll collection system comprises the steps of obtaining first positioning information and second positioning information, the first positioning information comprises vehicle GPS position information of the vehicle-mounted unit, vehicle running speed information and height information of the vehicle-mounted unit; the second positioning information comprises GPS position information of the roadside unit, microwave positioning information of the roadside unit and height information of the roadside unit; and the position information of the vehicle is determined according to the first positioning information and the second positioning information, so that the problem of large vehicle positioning error in the electronic toll collection system due to the difference of the installation environments of the roadside units and the characteristics of microwave signal reflection is solved, and the position precision of vehicle positioning in the electronic toll collection system is improved.

The invention discloses a glass fiber reinforced plastic acoustic emission source triangulation location method. According to the technical scheme, the method comprises the steps that 1, to-be-measured glass fiber reinforced plastic angle-speed polynomial is subjected to fitting; 2, sensor probes are arranged on a glass fiber reinforced plastic tank to be measured according to an isosceles triangle arrangement method; 3, coordinates of three vertexes of an isosceles triangle are set; 4, location results are obtained through operation. The glass fiber reinforced plastic acoustic emission source triangulation location method has the advantages that the problem that for the acoustic emission detection mode of the composite material of glass fiber reinforced plastic, the propagation speeds in different directions are different due to material anisotropy, and a location error is big is solved; the whole method is simple and easy to operate, and complex artificial operation can be replaced by means of curve fitting in an Excel table; the final measurement results are accurate.

The invention provides a positioning method and device, electronic equipment and a readable storage medium, and the method is applied to the electronic equipment, and comprises the steps: determining a first wireless access point of the electronic equipment, the first wireless access point being an access point including position information in a plurality of wireless access points received by the electronic equipment; the target position of the electronic equipment is determined based on the position information of the first wireless access point and a second wireless access point currently connected with the electronic equipment, and the multiple wireless access points comprise the second wireless access point. The positioning error can be reduced.