Patents
Literature
Hiro is an intelligent assistant for R&D personnel, combined with Patent DNA, to facilitate innovative research.
Hiro

33results about How to "Positioning results are stable" patented technology

Unmanned vehicle navigation and positioning precision correction method based on GNSS and visual odometry fusion

The invention relates to an unmanned vehicle navigation and positioning precision correction method based on GNSS and visual odometer fusion. The unmanned vehicle navigation and positioning precision correction method comprises the steps of: (1) detecting lane lines based on monocular vision; (2) optimizing positioning precision of a monocular visual odometer; (3) and correcting positioning precision of a GNSS / VO integrated navigation system. The unmanned vehicle navigation and positioning precision correction method utilizes the lane lines for assisting the visual odometer, then fusing the visual odometer with GNSS positioning to improve the reliability of a vehicle positioning system; the GNSS / VO has a high complementary feature, the GNSS can obtain a long-term stable positioning result, and VO can obtain short-term high-precision positioning data, two sensors are used for filtering a difference value of position measured values, and estimated value of VO system errors is used for correcting errors of the VO system, thereby realizing the purpose of restricting long-term drift of the VO data by utilizing the GNSS data.
Owner:CHERY AUTOMOBILE CO LTD

Lane line positioning method based on multi-feature fusion and polymorphism mean value

The invention provides a lane line positioning method based on multi-feature fusion and a polymorphism mean value. According to the method, images of road conditions in front of vehicles are obtained through a camera; the gray level distribution information of lane lines and the color distribution information in an HSI space are fused according to weight to obtain a lane line suspected area according to the pavement gray scale normal distribution features and the HIS color space information; then, according to priori knowledge, the searching is carried out from the middle of a road to the two sides for excluding non-lane regions, and sub images which avoid the non-road feature interference and contain the lane lines are obtained; then, the sub images are subjected to margin determination; Hough transformation is adopted for detecting straight lines for determining the positions of the lane lines in the current frame; and finally, through fusing the multi-frame lane line states and utilizing the actual condition that the lane line positions cannot suddenly change, the mean value of detection results of continuous frames is worked out, and stable lane line positioning results are obtained.
Owner:HOPE CLEAN ENERGY (GRP) CO LTD

Signal source positioning method based on BFGS quasi-Newton method

The invention discloses a signal source positioning method based on a BFGS quasi-Newton method and mainly aims to solve the problems that median error is introduced in an existing positioning method, positioning results are fuzzy, practicality is not strong, calculation amount is large, positioning results are not stable and the like. The signal source positioning method based on the BFGS quasi-Newton method comprises the following steps of obtaining a measured value reaching time difference and a measured value reaching gain ratio; setting joint positioning error equations through the relationship that the measured valve minus measured error is a real value; obtaining solution of the positioning error equations through the BFGS quasi-Newton method; and obtaining position coordinate values of a target source through the fact that the solution of the positioning error equations plus position coordinate values of a reference monitor node. According to the signal source positioning method based on the BFGS quasi-Newton method, stable and high precision positioning is achieved. The signal source positioning method based on the BFGS quasi-Newton method is suitable for the environment with low signal-noise rate and strong in practicability.
Owner:XIDIAN UNIV

Positioning and tracking system method of active nodes in linear environment

The invention discloses a positioning and tracking system and method of active nodes in a linear environment. The system comprises wireless access points, positioning labels and a server, wherein the server is communicated with the wireless access points; the positioning labels can move in the linear region of the linear environment as active nodes, and send frame exploring data periodically; the wireless access points are distributed at the fixed positions in the linear environment as anchor nodes, and are used for capturing the frame exploring data sent by the positioning labels, calculating the received signal strength indicator (RSSI) information of the positioning labels in accordance with the captured frame exploring data, and packaging the RSSI information of the positioning labels into packets as well as directly sending the packets to the server by multi-skip wireless routers or wired networks; and the server integrates the RSSI information of all the positioning labels, and acquires the real-time position of each positioning label in accordance with the RSSI information of all the positioning labels. The positioning and tracking system is accurate, reliable and stable in positioning.
Owner:SUZHOU INST FOR ADVANCED STUDY USTC

Supercompact combination satellite navigation receiver

The invention discloses a supercompact combination satellite navigation receiver which comprises a radio frequency front end, a signal preprocessor, a base band prefilter, a navigation filter, a micro inertial navigation module, a pseudo-range and pseudo-range rate calculating module and an ephemeris resolving and start selection calculating module. A self-adaptive filter is arranged between the base band prefilter and the navigation filter. An output of the base band prefilter is used as an input to be switched in the self-adaptive filter and then an output of the self-adaptive filter is used as an observed quantity to be input into the navigation filter to carry out data fusion, and thus, the stability and the tracking accuracy of a tracking loop can be obviously improved, so that the adaption capacity of GNSS (Global Navigation Satellite System) positioning on the environment and the motion state is improved. Furthermore, the vector tracking loop is formed by the signal proprocessor, the base band prefilter, the self-adaptive filter, the navigation filter and the pseudo-range and pseudo-range rate calculating module; and the navigation filter adopts a federated filter, so that the stability and the tracking accuracy of the tracking loop can be improved, and thus, the performances of reliability, positioning accuracy and the like of the GNSS positioning are improved.
Owner:ZHEJIANG SCI-TECH UNIV

Indoor positioning method based on light pattern

The invention discloses an indoor positioning method based on a light pattern. The method comprises the following steps: 1, arranging a light pattern emission apparatus; 2, detecting light signals of an object to be positioned; and 3, positioning the position of the object to be positioned, and obtaining a distance rho from the object to be positioned to a flabellum rotating shaft and a deflection angle theta of the object to be positioned relative to a datum line. According to the invention, through improving composition and arrangement of a light pattern emission apparatus, corresponding measurement parameters of a conventional indoor positioning method based on a light pattern and the like, compared to the prior art, the method provided by the invention has the following advantages: the problem of not high indoor positioning precision can be effectively solved, the indoor positioning method can realize centimeter-grade positioning precision, the quantity of positioning objects is large, and the positioning scope is wide. Besides, the indoor positioning method does not have high requirements for hardware functions of the positioning objects, and the application scope can be greatly expanded.
Owner:HUAZHONG UNIV OF SCI & TECH

Multi-direction collection combined clustering WiFi fingerprint indoor positioning method

The invention discloses a multi-direction collection combined clustering WiFi fingerprint indoor positioning method. The method comprises the steps that (1), a signal collector selects east, west, south and north directions for signal strength value collection; (2), signal strength values in the (1) are denoised; (3), fingerprint data is clustered, indexes are established, and after the final element is screened completely, signal strength in each location fingerprint is sorted according to a descending order; and (4), classes which have H maximum values the same as those of to-be-measured point signals are found according to a set of each cluster in the (3), and coordinate locations of the to-be-measured points are computed through adoption of K-nearest neighbor. According to the method,a multi-direction collection method and a denoising clustering method are employed for fingerprint library production. Compared with a traditional fingerprint positioning method, the method has the advantages that the positioning precision is improved by 15%, the positioning time is reduced by 20%, and the defect that in a traditional WiFi fingerprint positioning process, the data processing is not reasonable enough, the fingerprint library reliability is low and the positioning timeliness is low is effectively solved.
Owner:GUIZHOU UNIV

Indoor positioning method based on WiFi, Bluetooth and pedestrian dead reckoning fusion

The invention discloses an indoor positioning method based on WiFi, Bluetooth and pedestrian dead reckoning (PDR) fusion, and the method is characterized in that the method comprises the following steps: 1) dividing a positioning region, and building a WiFi offline fingerprint data 2) clustering the training samples to obtain a centroid-like vector; 3) adopting a hierarchical clustering algorithm to obtain positioning coordinates; (4) achieving Bluetooth positioning by adopting an improved weighted centroid algorithm, (5) obtaining a WiFi and Bluetooth fusion positioning coordinate by fusing WiFi and Bluetooth positioning, and (6) obtaining a final positioning coordinate in combination with PDR. The method has the characteristics of high positioning precision and low software calculation amount, and can meet the real-time positioning precision requirement.
Owner:GUILIN UNIV OF ELECTRONIC TECH

Signal source positioning method for uniform velocity fields

The invention discloses a signal source positioning method for uniform velocity fields. The method comprises the following steps: firstly constructing hyperboloid equations of a signal source position by using a residual equation of the theoretical arrival time and observation arrival time of two sensor pairs; constructing a virtual field in a local coordinate system according to each hyperboloid equation; superposing and averaging all the hyperboloid equations in a space by utilizing a coordinate conversion technology so as to obtain an integral virtual field; and searching the position of the maximum value of the integral virtual field in the space by utilizing a common unconstrained optimization algorithm and taking the position as the signal source positioning result. The objective function of the integral virtual field has continuity and differentiability in the space, so that the positioning method has good resistance to the severe picking errors, and has the characteristics of being high in positioning speed and good in stability.
Owner:CENT SOUTH UNIV

Indoor and outdoor integrated positioning and navigation method and system

The present invention discloses an indoor and outdoor integrated positioning and navigation method and system, and relates to the field of positioning fusion. The method comprises: step 1: obtaining GPS, Bluetooth and inertial positioning data; step 2: after performing adaptive weighting, Kalman filtering and distance-based correction on the positioning data to complete positioning solving to obtain a final positioning point; step 3: performing point set division on a navigation line to obtain a reference point for projection calculation, and using a sliding window and curve geometric projection to project the final positioning point onto the reference point of the navigation line to obtain a projection point; and step 4: using the projection point for navigation and map display. Accordingto the technical scheme of the present invention, an adaptive weighting and Kalman filtering model is used to obtain a smooth positioning result, and distance-based correction is performed on the result to obtain stable and accurate positioning, so that the difficulties of the calculation amount, the real-time performance and stability caused by the fusion of inertial positioning, Bluetooth positioning and GPS positioning are overcome, and smooth indoor and outdoor integrated positioning and navigation can be achieved.
Owner:CHENGDU LINGQI SPACE SOFTWARE +1

Mapping method and device, computer readable storage medium and robot

The invention belongs to the technical field of robots, and particularly relates to a mapping method and device, a computer readable storage medium and a robot. The method is applied to the robot, therobot comprises a first laser radar and a second laser radar, and the installation position of the first laser radar is higher than that of the second laser radar. The method comprises the steps of acquiring a first laser key frame; calculating the current pose of the robot according to the first laser key frame; updating a first probability map according to the current pose and the first laser key frame to obtain an updated first probability map; obtaining a second laser key frame; updating a second probability map according to the current pose and the second laser key frame to obtain an updated second probability map; and generating a fusion grid map for robot navigation according to the updated first probability map and the updated second probability map. The stability of positioning and navigation is greatly improved.
Owner:UBTECH ROBOTICS CORP LTD

WLAN indoor positioning method based on sample capacity optimization and variance analysis

The invention discloses a WLAN indoor positioning method based on sample capacity optimization and variance analysis. The method comprises the steps of firstly during an offline stage, based on analysis on RSS sample characteristics, using an OC function to optimize a fingerprint database to construct an allowable minimum RSS sample; then, selecting an optimal AP (access point) for constructing the fingerprint database via an AP selection method based on information gain; and at last, roughly positioning a target terminal via a statistical hypothesis variance analysis method by using the affect of the RSS sample mean and sample capacity on similarity between samples during on online stage, and thus providing a KNN algorithm based on variance analysis to finely position the target terminal.According to the method provided by the invention, the problem of influence of the blindness and unreliability of fingerprint data collection and the fluctuation of the RSS sample on the positioningperformance is solved. Experimental results show that by using the method, the relatively stable positioning result is acquired with the limited sample capacity, and the labor and time overheads are significantly reduced.
Owner:CHONGQING UNIV OF POSTS & TELECOMM

Positioning method for Sagnac distributed optical fiber sensing system based on convolutional neural network ensemble learning

The invention discloses a positioning method for a Sagnac distributed optical fiber sensing system based on convolutional neural network ensemble learning. The method comprises the steps of taking a fixed interval point on a sensing optical fiber as a disturbance point, enabling the sensing system to obtain an interference signal generated by the simulation disturbance of each point, carrying outthe preprocessing of the interference signal, and enabling the preprocessed interference signal to serve as a training set and a verification set, training two convolutional neural network models fordifferent loss functions to enable the two CNN models to accurately position near-end and far-end disturbances respectively, combining training results of the two models through an ensemble learning method to obtain a disturbance position prediction model based on CNN ensemble learning, and optimizing parameters of each model through the verification set. A to-be-positioned interference signal ispre-processed as a test sample, and the to-be-positioned interference signal is tested by using the trained prediction model to obtain a disturbance position of the to-be-positioned interference signal. The method does not need signal demodulation, is low in system complexity, is not sensitive to noise, is simple in data processing method, is stable and accurate in positioning result, and can be used for the disturbance positioning of an annular or linear Sagnac distribution optical fiber sensing system.
Owner:SHANGHAI UNIV

Autonomous parking navigation method based on parking lot map data guidance

The invention provides an autonomous parking navigation method based on parking lot map data guidance, and belongs to the field of autonomous parking, and the autonomous parking navigation method comprises the steps: building a parking lot high-precision map containing parking lot environment information, obtaining the position of a vehicle through the comparison and matching of the obtained vehicle surrounding perception information and the parking lot environment information, selecting a preset parking space from the parking lot high-precision map, so that the system plans the shortest driving path between the vehicle and the selected parking space according to the position of the selected parking space and the position of the vehicle, and the vehicle is enabled to rapidly drive to the selected parking space; meanwhile, in the manual driving state, the vehicle surrounding information is extracted and compared with the parking lot environment information, when a unique matching result does not exist, the vehicle surrounding information is collected, map information is generated and fused with a parking lot high-precision map to generate a new parking lot high-precision map, and therefore secondary parking navigation of the vehicle and parking navigation of other vehicles are facilitated.
Owner:上海追势科技有限公司

Method and device for indoor three-dimensional space positioning based on rotary light patterns

The invention discloses a device for indoor three-dimensional space positioning based on rotary light patterns. The device comprises a periodical flashing light source and a uniform rotation special-shaped fan blade, wherein the plane of the fan blade is parallel with ground; a connecting line between the center of the light source and the center of the fan blade is vertical to the ground; a plurality of devices are arranged on the plane which is parallel with the ground, and the fan blade rotary cycles and light source flashing cycles of the devices are different. The invention also provides a method for the indoor three-dimensional space positioning based on the device. The method comprises the following steps of detecting the change rule of different light patterns by a photosensitive sensor, so as to judge an included angle between a to-be-positioned target and the rotation axis vertical line of the fan blade, and a direction included angle between the to-be-positioned target and the centerline of each fan blade; then, determining the position of the to-be-positioned target by the position of the light source. The device has the advantages that the positioning accuracy is high, the positioning result is stable, the layout cost is low, the hardware requirement of target positioning is low, the number of simultaneously positioned targets is more, the expanding of positioning range is easy, and the like.
Owner:HUAZHONG UNIV OF SCI & TECH

Magnetic positioning method based on spatial multi-point magnetic field intensity information fusion

A magnetic positioning method based on spatial multi-point magnetic field intensity information fusion comprises the following steps: measuring magnetic field intensity information of a plurality of spatial points through a plurality of magnetic sensors arranged at intervals according to a certain distance, and calculating to obtain position information of a magnetic marker through a magnetic field intensity vector of each spatial measurement point; and acquiring mutual confidence factors among the positioning results of the plurality of spatial measurement points to form a confidence matrix so that information fusion among the positioning results of the plurality of spatial measurement points is realized, and performance such as positioning precision, stability and the like can be improved.
Owner:QUANZHOU INST OF EQUIP MFG

Indoor Terminal Positioning Method Based on Virtual Sampling Points

The invention discloses an indoor terminal positioning method based on virtual sampling points. The indoor terminal positioning method comprises the following steps: collecting and filtering signal strength of a terminal; judging which AP (access point) wins fast to realize fast positioning of the AP when the terminal is very close to the AP, wherein if a certain AP receives the signal strength of the terminal, which is larger than a set threshold value, the AP is considered to win fast, and then outputting the position of the AP as a positioning result; executing the similarity matching process of the virtual sampling points, and selecting the sampling point as the positioning result if a certain virtual sampling point wins; executing weight matching of the virtual sampling points, and selecting the sampling point as the positioning result if a certain virtual sampling point wins; and otherwise, keeping the position of terminal unchanged. The logic relation between the position in an actual environment and the AP in a WIFI (wireless fidelity) environment is in correspondence through the virtual sampling points, and the virtual sampling points are used as positioning datum points for indoor positioning, thereby avoiding the sampling work for sampling positioning and improving the capability of responding to the changes in the environment.
Owner:SUZHOU INST FOR ADVANCED STUDY USTC

RFID (radio frequency identification) indoor positioning method and system based on machine learning

The invention discloses an RFID (radio frequency identification) indoor positioning method and system based on machine learning. The method comprises the following steps of sending multi-frequency carrier waves to a target and acquiring phase difference data; preprocessing the phase difference data; establishing a prediction model by adopting a categorical regression algorithm; acquiring coordinates of the target according to the prediction model. Compared with a traditional technology, the method and the system have the advantages that the positioning precision is high, accurate distance measurement, data processing and modeling analysis can be carried out on the target, and therefore accurate and stable positioning results are obtained.
Owner:FOSHAN SHUNDE SUN YAT SEN UNIV RES INST +2

Supercompact combination satellite navigation receiver

The invention discloses a supercompact combination satellite navigation receiver which comprises a radio frequency front end, a signal preprocessor, a base band prefilter, a navigation filter, a micro inertial navigation module, a pseudo-range and pseudo-range rate calculating module and an ephemeris resolving and start selection calculating module. A self-adaptive filter is arranged between the base band prefilter and the navigation filter. An output of the base band prefilter is used as an input to be switched in the self-adaptive filter and then an output of the self-adaptive filter is used as an observed quantity to be input into the navigation filter to carry out data fusion, and thus, the stability and the tracking accuracy of a tracking loop can be obviously improved, so that the adaption capacity of GNSS (Global Navigation Satellite System) positioning on the environment and the motion state is improved. Furthermore, the vector tracking loop is formed by the signal proprocessor, the base band prefilter, the self-adaptive filter, the navigation filter and the pseudo-range and pseudo-range rate calculating module; and the navigation filter adopts a federated filter, so that the stability and the tracking accuracy of the tracking loop can be improved, and thus, the performances of reliability, positioning accuracy and the like of the GNSS positioning are improved.
Owner:ZHEJIANG SCI-TECH UNIV

Robot positioning control method and system based on point cloud normal vector direction clustering servo

The invention discloses a robot positioning control method and system based on point cloud normal vector clustering servo, which belongs to the field of visual servo technology. The robot has six degrees of freedom of motion and is fixedly connected to an RGBD depth camera; the method includes: obtaining The ideal point cloud image of the target to be positioned; calculate the normal vector of each point in the ideal point cloud image and cluster to obtain the cluster centroid set to obtain the actual point cloud image of the target to be positioned; calculate the normal vector of each point in the actual point cloud image and clustering to get the cluster centroid set M C ;According to the cluster centroid set and M C Calculate the rotation matrix and translation transformation vector of the RGBD depth camera at the current position relative to the ideal position, and calculate the speed V of the RGBD depth camera based on the calculation result C ; If V C did not converge to 0, making the robot follow V C After moving the preset time, V is recalculated C and judged until V C converges to 0. The present invention has stable and high-precision positioning results for weak texture targets, and has better adaptability.
Owner:HUAZHONG UNIV OF SCI & TECH

Sunlight greenhouse roller shutter positioning method and synchronous monitoring method

The embodiment of the invention provides a sunlight greenhouse roller shutter positioning method and a synchronous monitoring method. The positioning method comprises the steps of obtaining detectioninformation of each illumination sensor, wherein each illumination sensor is arranged on a greenhouse surface curve of the section of the sunlight greenhouse; and acquiring the current position of theroller shutter based on the detection information of each illumination sensor. According to the method provided by the embodiment of the invention, the roller shutter is positioned based on the detection information of each illumination sensor, and the positioning based on the illumination sensors belongs to non-contact measurement, so that no mechanical loss exists, and the method has good reliability, a stable positioning result, high accuracy and low cost in a complex environment of agricultural production, and is beneficial to popularization.
Owner:CHINA AGRI UNIV

Robot positioning control method and system based on point cloud normal vector direction clustering servo

The invention discloses a robot positioning control method and system based on point cloud normal vector direction clustering servo, and belongs to the technical field of visual servo, and the robot has six-degree-of-freedom motion and is fixedly connected with an RGBD depth camera; the method comprises the following steps: acquiring an ideal point cloud image of a to-be-positioned target; calculating and clustering normal vectors of all points in the ideal point cloud image, and obtaining a clustering centroid set to obtain an actual point cloud image of the to-be-positioned target; calculating and clustering normal vectors of all points in the actual point cloud image, and obtaining a clustering centroid set MC; calculating a rotation matrix and a translation transformation vector of theRGBD depth camera at the current position relative to the ideal position according to the clustering centroid set and the MC, and calculating the speed VC of the RGBD depth camera based on the calculation result; and if the VC is not converged to 0, enabling the robot to move according to the VC for a preset time, recalculating the VC and judging until the VC is converged to 0. The invention hasa stable and high-precision positioning result for a weak texture target, and has better adaptability.
Owner:HUAZHONG UNIV OF SCI & TECH

An indoor and outdoor integrated positioning and navigation method and system thereof

The invention discloses an indoor and outdoor integrated positioning and navigation method and its system, which relate to the field of positioning fusion; the method includes step 1: acquiring GPS, Bluetooth and inertial positioning data; step 2: positioning data through adaptive weighting and Kalman filtering and complete the positioning calculation based on distance correction to obtain the final positioning point; step 3: divide the navigation line into a point set to obtain the reference point for projection calculation, and use the sliding window and curve geometric projection to project the final positioning point onto the navigation line The reference point to obtain the projection point; step 4: use the projection point for navigation and map display. The present invention adopts adaptive weighting and Kalman filter model to obtain smooth positioning results, corrects the results based on distance, obtains stable and accurate positioning, and overcomes the calculation amount caused by the fusion of inertial positioning, Bluetooth positioning and GPS positioning. Difficulties in real-time and stability, to achieve smooth indoor and outdoor integrated positioning and navigation.
Owner:CHENGDU LINGQI SPACE SOFTWARE +1

A Method and Device for Indoor Three-Dimensional Space Positioning Based on Rotating Light Patterns

The invention discloses a device for indoor three-dimensional space positioning based on rotary light patterns. The device comprises a periodical flashing light source and a uniform rotation special-shaped fan blade, wherein the plane of the fan blade is parallel with ground; a connecting line between the center of the light source and the center of the fan blade is vertical to the ground; a plurality of devices are arranged on the plane which is parallel with the ground, and the fan blade rotary cycles and light source flashing cycles of the devices are different. The invention also provides a method for the indoor three-dimensional space positioning based on the device. The method comprises the following steps of detecting the change rule of different light patterns by a photosensitive sensor, so as to judge an included angle between a to-be-positioned target and the rotation axis vertical line of the fan blade, and a direction included angle between the to-be-positioned target and the centerline of each fan blade; then, determining the position of the to-be-positioned target by the position of the light source. The device has the advantages that the positioning accuracy is high, the positioning result is stable, the layout cost is low, the hardware requirement of target positioning is low, the number of simultaneously positioned targets is more, the expanding of positioning range is easy, and the like.
Owner:HUAZHONG UNIV OF SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products