55results about How to "Avoid the influence of positioning accuracy" patented technology

The invention relates to an RSS (received signal strength) fingerprint database based secondary fuzzy clustering indoor-positioning method which includes the following steps of firstly, setting a position of an indoor signal coordinate node and forming an indoor positioning system; secondly, selecting a position of a reference point, measuring an RSS vector accepted by the reference point, and setting up an RSS fingerprint database; thirdly, clustering primarily to obtain a point same with a point to be positioned; fourthly, obtaining a reference point half similar to the point to be positioned, and obtaining an overall nearest point; fifthly, clustering secondarily to obtain a point same with the overall nearest point; and sixthly, weighting all points according to similarity, and computing coordinates of the point to be positioned. The RSS fingerprint database based secondary fuzzy clustering indoor-positioning method has the advantages that impact on positioning accuracy from multiple paths and non-line-of-sight and the like can be avoided effectively, no extra facility support is required and positioning algorithm complexity and cost of a positioning system are reduced.

The invention discloses a rapid iris positioning method with illumination robustness. The method comprises the steps of inputting a natural illumination photo of the front side of the human face, detecting the positions of the eye areas on the input human face image through a partial active appearance model, executing edge operators on the eye areas to acquire edge images of the eye areas, calculating fitted curves of the eye edges to work out internal canthus points and external angular canthus points, correcting the deflection angle of the human face with the connecting lines of the canthus points as reference lines, connecting the internal canthus points and the corresponding external canthus points, searching for the edges of the iris areas with the central points of the connecting lines as the initial search positions, regarding the detected length of the connecting line of the left edge point and the right edge point of each iris as the diameter of the corresponding iris and the central point of each connecting line as the positioned central point of the corresponding iris, and outputting the coordinates of the central points and the diameters of the irises. Positioning of the central points of the human eyes is achieved under natural lighting, and therefore the method has certain robustness for illumination and eyelid sheltering.

The invention provides a device and a method for accurate positioning of a facial tissue and an inner box of a packing box. The device comprises a box falling mechanism (10), a CCD assembly (20), a conveyer belt (30) and a conveyer belt mounting frame (40), wherein the box falling mechanism (10) is used for completing the box falling operation, the CCD assembly (20) is used for detecting the state of the facial tissue and transferring information, the conveyer belt (30) is used for transferring the facial tissue and adjusting the excursion of the facial tissue relative to the X direction and the Y direction of the inner box, and the angular deviation of the facial tissue and the Z direction of the inner box can be eliminated by controlling the rotation of the conveyer belt mounting frame (40); the box falling mechanism (10) comprises a box falling power unit (11), a box falling sliding rail (13), an inner mold (14) and a connecting block (15), a motor in the box falling power unit (11) drives a screw rod to rotate, and the power is transferred to the box falling sliding rail (13) by the connecting block (15), so that the box falling operation is realized. According to the invention, the inner box is fixed, but the facial tissue moves in the alignment process of the inner box and the facial tissue, so that not only is the adhesion precision of the facial tissue and the inner box improved, but also the stability and the reliability of the positioning operation can be improved.

The invention relates to a multi-target direct positioning method based on an uncorrected array and a neural network. The method comprises: placing single signal sources at different discrete coordinate points (known positions), establishing a sample library of uncorrected array manifold responses; enabling the uncorrected array to acquire target signal source data and to estimate the array manifold matrix thereof; using the sample library to automatically pair column vectors in the array manifold matrix, and classifying the array manifold vectors corresponding to the same target into the samegroup and merging the same into a high-dimensional data vector, determining the approximate area of each target; training a radial basis neural network by using the data sample corresponding to the approximate area of each target position, and using the high-dimensional data vector corresponding to each target as the input of the neural network, and using the output of the nerve network as the estimated position for the target. The method can avoid the huge computational amount caused by the correction of the antenna array and the grid search, has a good practical application value, and stable, reliable and high performance.

The invention discloses an indoor location method and system based on an Android platform MARG sensor, belonging to the technical field of location and navigation. The MARG sensor comprises a three-axis magnetometer, a three-axis gyroscope and a three-axis accelerometer. The indoor location system mainly comprises a data acquisition unit, a data processing unit and a display unit. When in location, an Android platform is held in hand by a pedestrian and the location information is acquired through the data acquisition unit, the data processing unit and the display unit. The noise filtration is performed on sensor data by utilizing an EKF (extended Kalman filter) algorithm so as to improve the location precision. In places with weak GPS (global positioning system) signal or without GPS signal, high-precision location can be achieved by virtue of the system. The indoor location system is applicable to the Android platform with the MARG sensor, and is good in real-time property, high in portability, high in location precision and convenient to use, and additional equipment is not needed.

The invention belongs to the technical field of medical image processing, and particularly relates to a marker recognition and mark point positioning method and a surgical navigation system. The marker recognition and mark point positioning method comprises the following steps of reading a CT image, performing preliminary cutting on a suspected marker, obtaining a final suspected marker, performing marker recognition based on sequence characteristics, judging whether the final suspected marker is a correct marker or not, performing projection on the correct marker, calculating the normal vector and thickness of the correct marker according to the projected image, and therefore positioning a marker point. The invention further provides a surgical navigation system adopting the marker recognition and mark point positioning method. The marker recognition and mark point positioning method is independent of factory manufacturing parameters of the marker, is little affected by the stuck position and conditions of the marker, and has the good accuracy and robustness.

The invention relates to a RFID indoor positioning system and an algorithm based on a deep Q network. The system comprises a plurality of RFID tags, a plurality of reader antennas, a reader baseband control module, a wireless transmission device (WIFI) and a computer management system. The RFID tags are used for carrying data information. The reader antennas are used for receiving tag informationand RSSI values. The reader baseband control module is used for driving the tags and the antennas, coding and decoding the date. The wireless transmission device is used for transmitting tag data. Thecomputer management system is used for controlling the sending of read and write commands, training a depth Q network model, and outputting specific tag positions. The algorithm comprises the following steps of: defining an initial state and an action and a Q estimation network and a target network as shown in the description; training sample tag location data to establish a location memory; performing a counter propagation; and updating a neural network and finding the optimal RSSI value to output the target location. Compared to the traditional indoor positioning algorithm based on the neural network, the RFID indoor positioning system and the algorithm based on the deep Q network reduces the power consumption of hardware, improves the sensitivity of the reader and the positioning accuracy of the target tag, and is particularly suitable for the case where the number of positioning targets is large.

The invention discloses a device-free target localization method based on a geometric mode, comprising the following steps: using a plurality of wireless communication nodes with multi-channel communication ability to constitute a measurement network, and measuring the received signal strength value at each of the multiple channels; in a positioning stage, taking links formed between the wireless communication nodes as straight line segments, determining effective areas and effective links affected by a target based on priori information, taking the intersections of the effective links in the effective areas as possible target positions, and performing weighted averaging on the possible positions to get a single channel localization result; and finally, performing weighted fusion on the localization results of the multiple channels to get a final target position. The device-free target localization method needs no shadow model, only simple geometric operation and twofold weighted operation are needed, and computation resources and storage resources are rarely needed. The accuracy and robustness of device-free target localization can be improved effectively.

The invention provides an automobile sign accurate positioning method based on a road checkpoint blurred image. The method comprises the steps of according to the salient image characteristics of theautomobile sign area, by means of an image processing method of four stages, positioning area of the automobile sign accurately; obtaining automobile logo image information, the problem that in the prior art, clear images need to be provided by road level photographing equipment is solved. Even if the provided image is relatively fuzzy, the identification and positioning precision of the automobile logo is still very high; in an experiment, a test picture comes from materials under different illumination and weather conditions; the comprehensive recognition rate reaches 91%, the automobile logo positioning processing effect is accurately judged, the accuracy and timeliness of the algorithm are good, and the method has robustness and high efficiency, can adapt to various automobile brands,has universality and transportability, and has huge market popularization and application potentials.

The present invention provides a method for location of a location terminal and a location terminal. The method comprises the steps of: obtaining map information of an area where a location terminal is located; obtaining position information of a base station, a roadside unit or other terminals; measuring space distances from the location terminal to at least one base station, the roadside unit orother terminals; and according to the space distances, the position information and the map information, determining the geographic position of the location terminal. The method for location of the location terminal and the location terminal can avoid the influence of the low-precision distance measurement on the location precision, can reduce the dependence on the synchronization precision between the base stations and can reduce the errors caused by the measurement delay.

The invention provides an anti-interference satellite receiving equipment antenna switching apparatus under a shielding condition. The apparatus comprises a radio frequency joint, a radio frequency cable and a signal synthesizer. One end of the radio frequency joint is connected to an external connection antenna and the other end is connected to the signal synthesizer through the radio frequency cable. Satellite signals received by the external connection antenna in an unshielding environment are input into an external connection signal terminal of the signal synthesizer. Satellite signals received by an array antenna of the anti-interference satellite receiving equipment are connected to a GPS terminal and a BDS terminal of the signal synthesizer respectively. Input signals are combined through a power divider and are selected by a microwave switch in the signal synthesizer and then are output to a receiver module. Under the shielding condition, the satellite signals received by the external connection antenna are used; and after shielding is eliminated, the satellite signals received by the array antenna are used. In the invention, signal switching between the external connection antenna and the array antenna of the equipment can be completed so that the anti-interference satellite receiving equipment can work normally under a shielding state and can rapidly position after the shielding disappears.

According to the rapid global positioning method for the bounded area of the laser radar, coarse positioning of the map area where the robot is located is achieved by constructing and matching the first-level feature vectors of the global map and the local map; further according to a map where the robot is located, a secondary feature vector of the global map and a secondary feature vector of thelocal map are constructed; the precise positioning of the robot position and azimuth angle is realized, influence of illumination on positioning precision is effectively avoided, the convex polygon geometric map is utilized as map representation, the laser radar positioning algorithm based on map feature vector matching is acquired, algorithm complexity is reduced, and rapid global positioning ofthe robot in a bounded area is realized.

The invention discloses a seabed underwater acoustic response type positioning method and system based on a synchronous signal mechanism. The system mainly comprises a target transmitter, seabed transponders, a cable control receiver, an onboard processor and the like. The target transmitter is in communication interconnection with the onboard processor. The onboard processor is used for remotelytransmitting underwater acoustic instructions to a seabed transponder array. The seabed transponders are used for realizing signal response among the seabed transponders or between the seabed transponders and a cable control transmitter. The cable control receiver is used for receiving underwater acoustic distance information from the seabed transponders to the cable control transmitter. The onboard processor is used for calculating coordinate position information of the cable control transmitter and visually displaying the coordinate location information. In the underwater acoustic positioning mode, the great depth, large area, high precision, high timeliness and multi-target point synchronous positioning problem under complex sea conditions is solved, seabed real-time location positioning demands of different models of devices are satisfied, and a demand of navies for generalization, serialization and combination of dedicated guarantee equipment is satisfied.

The invention discloses an unmanned aerial vehicle autonomous carrier landing method based on vision assistance. The method comprises the steps that S1, a landing mark is designed; selecting two different types of two-dimensional codes, and forming a landing mark through nested placement; s2, taking an image; the unmanned aerial vehicle captures an image of a landing mark through a fixed down-looking camera; s3, obtaining a mark center coordinate; obtaining the coordinate of the landing mark center on the image by using a detection algorithm; s4, performing attitude compensation; the attitude change in the translation process of the unmanned aerial vehicle is eliminated through attitude compensation; s5, target prediction; introducing Kalman filtering to predict the position of the target on the image at the next moment in consideration of the real-time change of the pose of the landing mark; s6, landing is controlled; and the predicted coordinates are directly used as the input of the controller to realize the landing of the unmanned aerial vehicle. The method has the advantages of simple principle, high control precision, good reliability and the like.

The invention relates to an airborne synthetic aperture radar (SAR) image control-point-free real-time positioning method suitable for complex terrains, which comprises the following steps of: 1, calculating a memory address corresponding to a target center through a mouse click position, and acquiring SAR auxiliary data corresponding to a target through the memory address; 2, analyzing aircraft position, imaging track angle, image close range, image sampling interval and side view direction parameters from the SAR auxiliary data; the airplane position comprising longitude, latitude and height; 3, geometrically calculating the distance from the target to the point under the aircraft by using SAR imaging according to the image sampling interval, the image short distance, the aircraft height and the imaging area elevation parameters; 4, calculating the azimuth angle of the target relative to the off-machine point; 5, obtaining the latitude and longitude of a target point by using a geodetic topic positive calculation formula and an iterative optimization algorithm according to the known latitude and longitude of a point under a machine, the distance from the target to the point under the machine and the azimuth angle of the target relative to the point under the machine; and 6, based on DEM data, carrying out iterative solution to obtain a final longitude and latitude value of the target point.

The invention discloses a mine underground positioning system and a positioning method based on a specific optical frequency. The system comprises an LED light source module, a database, a mobile terminal, a server, a control module and an LED driving module, wherein the LED light source module is used for emitting the LED light source; the database is used to store LED light source information; amobile-end camera is used to collect an LED light source image and upload the LED light source image to a server at the same time, and a mobile-end inertial navigation system is used to realize motion tracking and real-time navigation; the server calculates the spectral stripe information of the LED light source image, the spectral stripe information is compared with the LED light source information in the database, and exact position information is finally returned to the mobile end; the LED driving module is used to drive the LED light source module; and the control module is used to enablethe LED driving module. The characteristics of different visible optical frequency are used and the inertial navigation technology is combined for auxiliary positioning, and the positioning and navigation accuracy in a complex mine environment is improved.

The invention aims to provide a mobile phone VR box, a mobile phone camera is combined with a reflector, so that a smart phone can acquire dynamic data of the body of a user and scene data of the ground, and a hardware basis for the mobile phone to realize six-degree-of-freedom (6dof) tracking and body interaction is provided. In order to solve the technical problem, the mobile phone VR box is realized by adopting the following technical scheme: the mobile phone VR box comprises a box body, the front part of the box body is provided with a mobile phone accommodating cavity, the middle part ofthe box body is provided with a lens group, and the rear part of the box body is provided with a head fixing device. The reflector is arranged at the front end of the mobile phone accommodating cavity, and an included angle is formed between the reflector and the mobile phone accommodating cavity.

The invention provides a machining fine positioning pin positioning protection device and discloses a device for driving a protection plate to eccentrically rotate through moving of a fine positioningpin, enabling the protection plate to be shielded between a product and the fine positioning pin, and protecting the fine positioning pin. The machining fine positioning pin positioning protection device is characterized in that multiple installing holes are formed in a base, a sliding rail is arranged on the base, the outer edge of one end of the sliding rail is flush with the outer edge of oneside of the base, two lubricating oil grooves are formed in the sliding rail and intersected to form a grid, a limiting block is arranged between one end of the sliding rail and the base, the slidingbase is arranged at the other end of the sliding rail in a sliding manner, a fixing cover plate is arranged on the sliding base and fixed through multiple fixing screws, the fine positioning pin is arranged on the fixing cover plate and located over the sliding rail, a supporting frame is arranged on the base and located on one side of the sliding base, one end of a transmission rod is arranged onthe supporting frame through a bearing, and the other end of the transmission rod extends along the sliding rail to be flush with one end of the sliding rail.

The invention belongs to the technical field of automobile bodies in white, and particularly relates to a method for improving positioning strength of a built-in clamp. The method comprises the following steps that 1, fixing positions of a first supporting unit and a second supporting unit are arranged on the two sides of gravity center of a side wall assembly; 2, the first supporting unit and thesecond supporting unit are designed and installed; 3, the first supporting unit and the second supporting unit are mounted on site, X, Y and Z data of a profiling block is measured in a three-coordinate mode, and the first supporting unit and the second supporting unit are adjusted to theoretical positions; and 4, pressure control valves of the first supporting unit and the second supporting unitare adjusted in combination with load variation of a side wall assembly positioning pin. According to the method for improving positioning strength of the built-in clamp, the influence of gravity ofthe side wall assembly on strength of the overturning positioning pin is eliminated through a method of adding the side wall assembly supporting units to a floor clamp, and the problem of insufficientpositioning strength of an existing built-in clamp is solved.