41results about How to "High positioning accuracy" patented technology

The invention discloses a base station positioning method based on a high-precision time synchronization network, and belongs to the field of navigation positioning. The method comprises the following steps: acquiring absolute time or relative time difference of transmission of radio waves between a terminal to be positioned and at least three base stations; obtaining spatial coordinate information of the base station in a preset coordinate; calculating a relative distance or a relative distance difference between the terminal to be positioned and the base station according to the absolute time or the relative time difference; according to the relative distance or the relative distance difference and the space coordinate information and a preset strategy, obtaining position information of a to-be-positioned terminal; and constructing an optical fiber tree topology structure network between the base stations. According to the method, the time synchronization error of a slave clock and a master clock is adjusted; the time synchronization of the slave clock and the master clock is realized, the time synchronization precision of the base station is improved, the subnanosecond level is reached, when the distance difference between the base station and the to-be-positioned mobile terminal is obtained through positioning calculation, the time value measurement is more accurate, the centimeter-level positioning error can be realized, and the positioning precision is greatly improved.

The invention relates to a general welding clamp for producing base plates of a prototype vehicle and derived vehicle types of the prototype vehicle. The general welding clamp comprises a fixed base, a switching mechanism and a positioning mechanism, wherein the switching mechanism comprises a linear air cylinder, a guide rail sliding groove assembly and two switching limiting blocks, which are arranged on the fixed base; the positioning mechanism comprises an air cylinder fixing bracket and a positioning air cylinder which is arranged on the air cylinder fixing bracket; the air cylinder fixing bracket is movably erected on the guide rail sliding groove assembly and is driven by the linear air cylinder to move along the guide rail sliding groove assembly; the two switching limiting blocks are positioned at two ends of the guide rail sliding groove assembly respectively and are used for limiting the moving position of the air cylinder fixing bracket on the guide rail sliding groove assembly. Compared with the prior art, the general welding clamp for producing the base plates of the prototype vehicle and the derived vehicle types of the prototype vehicle has the advantages that the generality of the derived vehicle types can be achieved by switching the positions of parts of the welding clamp; the production cost is reduced.

The invention discloses a positioning system and method. The positioning system comprises a hardware system and a software system, wherein the hardware system comprises a singlechip, as well as a clock circuit, a reset circuit, a power supply, a display, a distance meter and a sound-light alarm which are respectively connected with the singlechip; the power supply and the singlechip are directly provided with proximity switches; the control system of the singlechip is connected to a drive circuit and a probe bracket; and the software system comprises a control module, as well as a transmission module and a receiving module which are respectively connected with the control module, and the control module is used for controlling startup of the transmission module and the receiving module. The positioning system has the advantages of high positioning accuracy, exact distance measurement, high reliability, small error and sensitive reaction, and can be used for accurately displaying the probe distance and automatically alarming.

The invention provides a vehicle control method, a vehicle-mounted device and a mobile terminal, and the method comprises the steps: building a first communication connection between the vehicle-mounted device and the mobile terminal, predicting a first movement track or a second movement track of the mobile terminal, and executing a first operation when a first condition is met, or executing a second operation when a second condition is met; the first condition comprises that the first moving track enters the first area, and the mobile terminal enters the second area; the second condition comprises that the second moving track leaves the third area, and the mobile terminal leaves the second area; the second area comprises the first area, and the third area comprises the first area. According to the technical scheme, the positioning precision of the automobile Bluetooth key can be improved, the intention of a user can be recognized, the automobile can automatically execute operation instructions such as automobile door unlocking and locking, the use convenience of the key-free entering and starting functions of the automobile is improved, and the convenience and comfort experience of the user in using the automobile are improved.

The embodiment of the invention belongs to earthquake monitoring, and relates to a seismic source positioning method, which comprises the steps of: obtaining a seismic source and arrival time information of at least one microearthquake signal; calculating at least one positioning error corresponding to the positioning function through the at least one positioning function and the at least one arrival time information of the micro-seismic signal; repeatedly calculating a plurality of corresponding wave velocities through each positioning error to obtain at least one wave velocity set corresponding to the positioning error; calculating the range of each wave velocity set, and taking the wave velocity set with the smallest range as a target set; if the target set is an empty set, selecting acorresponding positioning function with the minimum positioning error as a target function; if the target set is not the null set, taking a classic method CM as a target function; and calculating thefocus position through the target function. The positioning precision under complex geological conditions is improved.

The invention relates to a power head structure of a four-corner corner connecting machine. The power head structure of the four-corner corner connecting machine comprises a corner connecting head base plate, a corner connecting head table plate, a concave positioning and side positioning integrating mechanism, a convex positioning mechanism and a perpendicular compression mechanism, wherein equally high supporting plates are perpendicularly installed on the corner connecting head base plate, the corner connecting head table plate is arranged on the equally high supporting plates, the concave positioning and side positioning integrating mechanism is horizontally installed on the corner connecting head table plate, the perpendicular compression mechanism is installed above the concave positioning and side positioning integrating mechanism, and the convex positioning mechanism is perpendicularly installed on the corner connecting head table plate. By effectively integrating original concave positioning, side positioning, convex positioning and perpendicular positioning, the power head structure of the four-corner corner connecting machine improves the efficiency of positioning and adjusting four-corner doors and windows, and improves the yield rate.

The invention discloses an electric spindle turning device of a woodworking engraving machine. A turning groove is formed in a slide carriage. After a driven boom obliquely penetrates through the turning groove, one end of the driven boom is fixedly connected with the slide carriage through hinges, and the other end of the driven boom is connected with a spindle seat through hinges. A circular hole is formed in the middle of the spindle seat, and an electric spindle is embedded in the spindle seat. A milling cutter is installed on the electric spindle. One end of a driving boom is connected with the spindle seat through hinges, and the other end of the driving boom is fixedly connected with a drive shaft. A positioning key is installed between the spindle seat and the slide carriage, and plays a role in accurate positioning when the spindle seat is in the horizontal and vertical positions. By means of the electric spindle turning device, quick switching of the vertical mode and the horizontal mode of the electric spindle can be achieved, quick milling feeding can be achieved while a workpiece is machined, the rigidity deformation is low, and precision is high.

The invention discloses a time service positioning network system for an underground chain-shaped large space of a coal mine, which is based on an ad hoc network base station which is linearly deployed in the underground chain-shaped large space of the coal mine, and adopts a base station level network internal time synchronization method which takes optical fiber time service as a main part and takes satellite time service as an auxiliary part. A time service positioning network system with a unified time reference in an ad hoc network base station is constructed, and through network construction, network stabilization and network application, by means of a base station level network internal clock synchronization method, a base station level network time reference is unified, and the network application positioning precision is improved; on the basis of an original underground communication ring network, a time service positioning network system suitable for an underground coal mine is integrated, and the network applicability is expanded.

The embodiment of the invention discloses a positioning method and related equipment. The method comprises: determining, by first equipment, the target distance between the first equipment and second equipment in a preset range through a Bluetooth module, wherein the target distance is determined according to a Beacon signal corresponding to the second equipment, and the Beacon signal is obtained by scanning a BLE signal sent by the Bluetooth module at a preset time interval; if the target distance is smaller than or equal to a first threshold value, starting a UWB communication module, and completing the positioning of the second equipment through the UWB communication module; if the target distance is greater than the first threshold value and less than a second threshold value, starting a UWB communication module and a preset positioning module, and completing the positioning of the second equipment through the UWB communication module and the preset positioning module; and if the target distance is greater than or equal to a second threshold value, starting a preset positioning module, and positioning the second equipment through the preset positioning module of the Bluetooth module. The embodiment of the invention is beneficial to improving the positioning precision.

The invention discloses a positioning method and device, and the method comprises the steps: enabling an AP (access point) to transmit M*K positioning inquiry signals to a station point STA through M*K different channels formed by M antennas; enabling the AP to receive a plurality of answering signals which are corresponding to the positioning inquiry signals and are emitted by the STA, and to obtain the feature information of each channel for receiving the corresponding answering signal; Comparing the feature information of the channels with preset channel feature information of a plurality of reference points, and determining a reference point matched with the STA; and carrying out the positioning of the STA according to the position information of the matched reference point. The method and device achieve the positioning of a to-be-positioned STA through the reference point with the determined position, can still obtain a plurality of feature channels with no need to move the AP in a mechanical manner, and improve the positioning precision of the STA.

The invention discloses a positioning method for grabbing a PCB and a positioning hole glue removing device for the PCB in the technical field of PCB glue removing, and aims at solving the technical problems that in the prior art, in the glue removing process, a positioning error is large, the utilization rate of a cut board is low, and the machining cost is high. The method comprises the steps ofallowing a light source to irradiate a back side of the PCB; collecting light transmitted through different positioning holes in the PCB on a front surface of the PCB, and obtaining the central position of each positioning hole; calculating the central position of the PCB according to the central position of each positioning hole, and transmitting the central position of the PCB to a first mechanical arm; allowing the first mechanical arm to align the center of a first suction cup to the center of the PCB to grab the PCB; placing the PCB on a horizontal table board through a mechanical arm, and finally allowing a hole milling device to conduct accurate hole milling and adhesive removing on the PCB positioning holes. The method can automatically and effectively identify the positions of the positioning holes and accurately remove the residual resin in the positioning holes, can be used for operations of various sizes, and can effectively improve the utilization rate of a cut board andthe processing efficiency of a multilayer printed circuit board.

The invention relates to the technical field of special-shaped element insert-in machines, in particular to a polyfunctional positioning device for a PCB (printed circuit board) for an insert-in machine. The polyfunctional positioning device for the PCB for the insert-in machine comprises two board sending tracks arranged symmetrically and parallelly, and conveying belts arranged in the board sending tracks, wherein a fixing device is arranged between the two board sending tracks, at least two gear devices are arranged between the two board sending tracks, and one gear device is arranged beside the fixing device. During inserting, firstly, a first gear device is used for stopping the entire PCB for preliminary positioning, then the fixing device is used for accurate positioning to a first small PCB, when the first small PCB is inserted in, a second gear device is used for preliminary positioning to the entire PCB again, and the fixing device is used for accurate positioning to the second small PCB. The polyfunctional positioning device provided by the invention can be used for positioning all small PCBs of the entire PCB respectively, and the accuracy of positioning is higher, therefore, the integral inserting accuracy of the insert-in machine is effectively improved, and the practicability is stronger.

The invention discloses a single interference source positioning method based on virtual boundary point fitting. The method comprises the following steps: S1: calculating the distance between a boundary node and an interfered node in a sensor network, selecting the nearest point pair, and obtaining a coordinate value of a virtual boundary point; S2: fitting a circular area of an interference rangeby using the virtual boundary node to obtain primary interference source coordinates and a primary interference distance; S3: analyzing and calculating a positional relationship among the interference range, the boundary node and the interfered node, and adjusting the calculation to obtain a new virtual boundary node; S4: performing re-fitting calculation by using the new virtual boundary node toobtain new interference source coordinates and a new interference distance; and S5: repeating the steps S2 to S4, and preforming multiple iterations until the optimal interference source coordinatesand the optimal interference distance are calculated. The method disclosed by the invention is simple in steps, easy to implement and high in positioning accuracy, and the problem that the location ofthe interference source needs to be accurately detected when the sensor network is attacked by a single interference source is solved.

The invention discloses a modeling method for satellite clock deviation between Beidou No.2 MEO satellite frequencies. The modeling method comprises the following steps: acquiring observation data of a Beidou No.2 MEO satellite in a long time period of N observation stations; calculating a DIF observation value according to the three-frequency carrier phase observation value; performing epoch difference calculation on the DIF observation value without cycle slip to calculate ED IFCB; performing weighted average on the ED IFCB of the same epoch of all observation stations according to the elevation angle, and calculating the final ED IFCB of each epoch; setting the IFCB of the first epoch of each week to be 0, calculating the IFCB epochwise, and obtaining an IFCB sequence of each week; performing harmonic analysis on the IFCB sequence per week, determining the number of harmonic terms and the period, and establishing an IFCB model consisting of linear terms and harmonic terms; and fitting a cycle model coefficient by using a cycle of IFCB sequence. According to the method, the seven-day orbit repetition period of the Beidou No.2 MEO satellite is fully considered, and the established model can accurately describe the one-week change of the IFCB of the MEO satellite.

The invention belongs to the technical field of radio navigation and positioning and provides a fingerprint map searching method of a steepest descent mode in fingerprint positioning operation. According to the method, search centers are determined in a successive manner and nearby reference points RPs are searched; upon each search, Euclidean distance between all RPs and a signal feature TP actually detected by a user is recorded during the search, and an RP with minimum Euclidean distance is recorded as a central point for a next search. K RPs with minimum Euclidean distance from the TP in a signal space are continuously updated during each layer of search processes. When continuous searches are conducted for L times and the K RPs do not change, the K RPs are determined as final selected ones and used as reference points for position estimation, the K RPs are brought into a KNN algorithm and resolved, and a conventional method for subjecting fingerprint maps to sequential search operation is replaced. The beneficial effects of the fingerprint map searching method are that compared with a conventional positioning after clustering method, the fingerprint map searching method is advantageous by improved positioning precision; compared with a conventional non-clustering method, the fingerprint map searching method is advantaged by improved search speed.

The invention relates to a multi-shaft mixed rapid control unit design method for a micro assembly system. Included are a TMS320F2812 chip, 12 motor drivers, two grating scales, two photoelectric coders, two opto-couplers isolation circuits, two signal conditioning circuits, two quadruplicated-frequency logic circuits and 12 stepping motors. The TMS320F2812 chip includes a PWM output circuit, a capture unit CAP and orthogonal coding circuit QEP and GPIO pins. The method simultaneously generates multi-channel PWM output waveforms through the TMS320F2812 chip so as to realize multi-shaft control; and the method realizes closed-loop, semi-closed-loop and open-loop mixed control according to assembly precision demands.

The invention relates to an orchard monorail transporter positioning system and method based on ultrahigh frequency RFID. The ultrahigh frequency RFID positioning system is constituted combining witha main control processor, a RFID reader, first and second RFID one-way antennas and a plurality of passive anti-metal tags on the basis of the monorail and the transporter; and the real-time perception of on-monorail location information of the orchard monorail transporter is realized by processing and calculating RSSI data. The orchard monorail transporter positioning method based on the ultrahigh frequency RFID has strong applicability, and the RFID reader can read on-monorail tag data without contact under the condition of non-line-of-sight, which is not affected by illumination, foliage sheltering and so no; and the comparison mode that the first and second RFID one-way antennas read the corresponding RSSI data are used to reduce the effects of the fruit tree crowns and the ground changes on the wireless signal transmission in the working environment, therefore, the transporter positioning error is reduced, and the positioning accuracy is improved.

The invention discloses a dangerous chemical stacking type storage cargo positioning optimization method, which comprises the following steps: establishing a dangerous chemical stacking type storage cargo positioning monitoring scene, and obtaining the time difference of arrival between a to-be-positioned label and each base station; establishing a TDOA-based positioning model in combination withthe obtained time difference of arrival, thereby determining an objective function of the position of the to-be-positioned tag; and searching an optimal solution of the objective function by utilizinga PSO algorithm for dynamically adjusting the inertia weight and the acceleration weight so as to obtain the position of the to-be-positioned tag. The method aims at the defects that an existing PSOalgorithm is prone to falling into local optimization and search stagnation occurs, the algorithm is improved, and inertia weight and acceleration weight are dynamically adjusted; The problem that theparticle swarm optimization algorithm is liable to fall into local optimum is effectively solved, so that the algorithm can be quickly converged to a globally optimal solution, and the algorithm is stable in performance and high in positioning precision; And a good technical means is provided for government departments to carry out dangerous chemical storage and mixed storage monitoring.

The invention provides an indoor fingerprint positioning system based on WIFI. The required calculation capability requirements and time cost of positioning of the indoor fingerprint positioning system are increased along with the increase of the number of the APs, so that redundant information is reduced through the AP selection, the calculation amount is reduced, the positioning efficiency is improved, and the terminal equipment with the low resources of the internet of things becomes very important. As the wireless AP in the urban area becomes more and more dense, the difficulty of the wifiindoor fingerprint positioning AP is increased. The invention discloses a method for distinguishing fingerprint points by utilizing RSSI interval overlapping degree to realize AP optimization, the optimal solution of parameters is obtained by carrying out training on the environment, so that the positioning precision is optimal.

The invention relates to wireless monitoring distance measurement technology improvement and provides a monitoring-based distance measurement method. The distance measurement method includes the following steps that: A, all agent nodes simultaneously send signals to anchor nodes in a point-to-point manner; all anchor nodes return signals, so that an RTM (round trip measurement) process can be completed; and C, a monitoring node obtains position information according to the interaction information of the agent nodes and the anchor nodes so as to obtain distances between the agent nodes and the anchor nodes. With monitoring-based distance measurement adopted, when signal attenuation is more and more serious, positioning accuracy can be effectively improved, and errors can be reduced.

The invention relates to the technical field of five-axis machine tool accessories, in particular to an AC linkage double-swing head of a five-axis machine tool. The AC linkage double-swing head comprises an A-axis shell; a first sealing cover and a second sealing cover are respectively arranged on the outer walls of the two sides of the A-axis shell through bolts; a top plate is arranged on the outer wall of the top of the A-axis shell through bolts; a C-axis connecting base is welded to the axis of the outer wall of the top of the top plate; a C-axis flange plate is installed on the outer wall of the top of the C-axis connecting base through bolts; a C-axis connecting disc is installed on the outer wall of the top of the C-axis flange plate through bolts; and a first bearing is embeddedinto the axis of the C-axis connecting disc. The AC linkage double-swing head has the beneficial effects that double-piston calipers are connected with a C-axis brake disc, so that when the double-piston calipers of the C-axis part of the AC five-axis linkage double-swing head are locked, the acting force of the double-piston calipers is applied to the C-axis brake disc, the geometric accuracy ofa bearing cannot be influenced, and the bearing can be well protected; therefore, the service life is prolonged, and the positioning precision and the working efficiency are improved.

The invention discloses a method of complex fixing the GPS and the mobile communication network, it includes: it stores the data of GPS positional information and NMR data on which is received from the different place of the end of locating device in the data implement of fixing server in advance, so as to constitute a base position database of the related NMR data associate with GPS position information(or constitute mapping relation); when the end of locating device response the locating request to setting or setting of own accord, firstly it receive the GPS satellite signal to locating through the GPS module, and acquire the position information of end of locating device; when the related GPS module cannot receive GPS satellite signal by some chance(for example: occlusion ), the related end of locating device send the NMR data to fixing server through wireless telecommunication equipment, the fixing server searches the NMR data which is suited with the received NMR data of stored in advance from the base position database of the NMR data, so as to acquire the position information of the end of the locating device.