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359results about How to "The positioning result is accurate" patented technology
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Positioning apparatus and method of a mobile terminal using a positioning server independently constructed on a network
ActiveUS20050239480A1The positioning result is accurateLow costPosition fixationRadio/inductive link selection arrangementsSatelliteReal-time computing
A positioning apparatus and method of a mobile terminal using a positioning server independently constructed on a network. The positioning apparatus includes a positioning server, independently constructed on a network, for collecting and storing / managing assistant data that includes orbit information and correction information of a satellite, and providing the assistant data or position information using the assistant data in response to an external request. The positioning server provides the position information of the terminal subject to positioning in response to the request for the position information of the terminal subject to positioning created from at least one network among a plurality of networks that share the positioning server. Accordingly, an accurate positioning result can be obtained with a cost for implementation of the positioning system reduced.
Owner:SAMSUNG ELECTRONICS CO LTD
Positioning method and positioning device for weak coverage area
ActiveCN105228242AFully automatedAchieve accuracyWireless communicationCommunications systemThird generation
The invention provides a positioning method and a positioning device for the weak coverage area and belongs to a wireless communication system. The positioning method for the weak coverage area comprises an acquiring step for acquiring a measurement report for a plurality of user equipment within a preset period of time, wherein the measurement report is a report for measuring the user equipment in a 4G and / or 2G and / or 3G system; a positioning step for determining the coordinates of the plurality of user equipment according to the acquired measurement report; a judging step for dividing the coverage area into a plurality of grids of a preset size, respectively judging whether each of the plurality of grids is a weak coverage grid or not according to a preset weak coverage grid judgment condition, and determining the weak coverage area according to judgment results. According to the weak coverage grid judgment condition, for all user equipment within a grid, the ratio of the user equipment with the RSRP thereof smaller than a preset threshold to all the user equipment in the grid is greater than or equal to a preset proportion. According to the technical scheme of the invention, the weak coverage area in the 4G system can be found out.
Owner:CHINA MOBILE COMM GRP CO LTD
CNN-deep-learning-based bridge-crack detecting and positioning method
ActiveCN106910186AImprove generalization abilityAdaptableImage enhancementImage analysisColor imageLearning based
The invention discloses a CNN-deep-learning-based bridge-crack detecting and positioning method, comprising: first, using the window sliding algorithm to cut a bridge image into smaller bridge crack surface element images and bridge crack background element images; and at the same time, based on the CNN-based DBCC classification model, identifying the bridge crack background element images and the bridge crack surface element images; then, in combination with the window sliding algorithm, performing bridge crack detecting and positioning on the entire bridge crack image; and finally, speeding up the algorithm through the search strategy of combining the image pyramid and ROI. Compared with the traditional crack detecting and positioning method, not only the bridge crack detecting and positioning method of the invention achieves a better detection effect and a stronger generalization ability, but also the method is performed directly based on color images, an impossible situation for the traditional crack detecting and positioning method.
Owner:SHAANXI NORMAL UNIV
Method and device for positioning vehicle
ActiveCN108732603AImprove processing efficiencySmall amount of calculationInstruments for road network navigationRoad vehicles traffic controlPoint cloudProject area
Owner:BAIDU ONLINE NETWORK TECH (BEIJIBG) CO LTD
Method for controlling microphone sound recording, digital audio signal processing method and apparatus
ActiveCN101478711AAvoiding Problems That Affect Recording EffectsThe positioning result is accurateElectrical apparatusSound sourcesDigital audio signals
The present invention discloses a microphone sound recording control method, a sound source positioning method, a digital audio signal processing method and a corresponding device thereof. The invention is used for increasing the sound recording effect of digital device. The microphone sound recording control method provided by the invention comprises the following steps: obtaining the distance from the target sound source to the microphone array in the sound recording process of microphone array; and adjusting the included angle two microphones in the microphone array. The sound source positioning method provided by the invention comprises the following steps: obtaining the distance from the target sound source to the microphone array in the sound recording process of microphone array; confirming the sound pick-up angle of microphone array according to the obtained distance; respectively confirming the maximum crosscorrelation values of audio signals received by two microphones in the microphone array; and confirming the sounding probability of target sound source according to the ratio between the maximum crosscorrelation value confirmed in the range of sound pick-up angle and the maximum crosscorrelation value confirmed outside the range of sound pick-up angle.
Owner:WUXI ZGMICRO ELECTRONICS CO LTD
Underground pipeline positioning method based on CORS (continuous operational reference system)
InactiveCN102509509ANavigation Accurately ImplementedPrecise positioningMaps/plans/chartsSatellite radio beaconingImage transferEngineering
The invention discloses an underground pipeline positioning method based on a CORS (continuous operational reference system). The method comprises the following steps of: I, establishing a CORS; II, collecting paper drawings: collecting the pipeline as-built drawings of all underground pipelines paved in an area to be positioned and the topographical map around each underground pipeline respectively; III, making an electronic map, wherein the making process comprises the steps of paper map electronization treatment, drawing scanning and pretreatment, raster image transfer, raster image orientation, image sector conversion, pipeline attribution information marking, edge matching treatment, projection conversion, data check, conversion into an embedded electronic map and the like; IV, transferring and visually displaying the electronic map; V, superposing the coordinate data of the electronic map; and VI, positioning the underground pipelines. The method disclosed by the invention is easy and convenient to use and operate, has a good using effect and high practical value, and can really realize accurate positioning of the underground pipelines and effectively solve the problems of inconvenience in positioning operation, relatively bad positioning effect and the like of the existing underground pipeline positioning method.
Owner:XIAN MEIHANG INFORMATION IND
Indoor visible positioning method and system based on camera shooting frame analysis
ActiveCN106597374ARealize transmissionThe positioning result is accuratePosition fixationClose-range type systemsImaging processingBinary information
The invention discloses an indoor visible positioning method and system based on camera shooting frame analysis. The system comprises a plurality of LED light sources, wherein the LED light sources are used for emitting modulated visible light with ultra-long sequence information; and an indoor positioning device which is used for taking a series of images corresponding to the visible light emitted by the LED light sources, obtaining and recognizing the bright and dark stripes in the images, eliminating the background light of the image, demodulating the binary information in each image, jointing the information demodulated from each image to form a needed ultra-long sequence, obtaining the identity information of the light sources, searching the position information, corresponding to the identity information, in an indoor map, and obtaining the current position. The system can carry out the high-speed and large-capacity modulation, coding and image processing, can eliminate the background light in photographing, and can improve the image processing precision.
Owner:PEKING UNIV +1
Indoor positioning method combining geomagnetic field and WIFI (wireless fidelity) signals
ActiveCN103630873AThe positioning result is accurateEasy to useNavigation by terrestrial meansPosition fixationSignal strengthHat matrix
The invention relates to the technical field of indoor positioning, in particular to an indoor positioning method combining geomagnetic field and WIFI (wireless fidelity) signals. According to the method, in an offline sampling stage, WIFI signal strength and geomagnetic field information samples are simultaneously collected and are uploaded to a positioning center database, data characteristic fusion and analysis are performed by adopting a principal component analysis method at a positioning center to generate a fusion projection matrix, and all sampling information in the database are projected by the projection matrix to obtain a fusion sample; in an online positioning stage, the vector of WIFI and geomagnetic field intensity information received by a terminal is projected by the fusion projection matrix to generate a fusion vector, and a positioning result is obtained by comparing the fusion vector with the fusion sample in the positioning center database. By adopting the method, accurate positioning combining WIFI and geomagnetic field intensity information can be realized on an existing ordinary smart phone.
Owner:XIAMEN YAXON NETWORKS CO LTD
Downhole micro-seismic event real-time inversion location method based on grid search
ActiveCN106154334APrecise positioningThe positioning result is accurateSeismic signal processingSeismology for water-loggingSignal-to-noise ratio (imaging)Wave field
The present invention provides a downhole micro-seismic event real-time inversion location method based on grid search. The method comprises: establishing a speed model in a space including a micro-seismic source under the well; performing P-wave and S-wave first arrival time pickup of the micro-seismic event; calculating the degree of polarization and the polarization direction of each channel recorded P-wave first arrival of the micro-seismic event; establishing a inversion target function, and performing the theory first arrival travel time from wave field forward modeling calculation grid points to an observation system; calculating a target function value, and determining the position of the seismic source; and calculating the three-dimensional spatial position coordinates of the seismic source. The method is fast in operation speed and high in efficiency; and moreover, the noise immunity is high, the micro-seismic event with low signal to noise ratio can be subjected to accurate micro-seismic source location to allow the micro-seismic source location result to be more accurate and reliable so as to improve the interpreting precision of the micro-seismic monitoring result.
Owner:中石化石油工程地球物理有限公司胜利分公司
Ultrasonic-array auxiliary positioning method and system used for indoor navigation
ActiveCN104111445AEfficient integrationThe positioning result is accuratePosition fixationNavigation instrumentsUltrasonic sensorMarine navigation
The invention provides an ultrasonic-array auxiliary positioning method and system used for indoor navigation. The method includes the following steps: S01: through an inertial navigation system, obtaining position information of a positioned subject and map information of a quasi-rectangular environment so that four predictive distance values from the center of the positioned subject to four edges of the quasi-rectangular environment are obtained; S02: according to positions of ultrasonic sensors relative to the positioned subject, a heading direction of the positioned subject and ranging values of the ultrasonic sensors, calculating four actual measurement distance values form the center of the positioned subject to the four edges of the quasi-rectangular environment; S03: comparing the actual measurement distance values with the predicative distance values, calculating absolute values of difference values and according to the sizes of the absolute values of the difference values, setting different weights of the different actual measurement distance values; S04: according to the different weights, carrying out weighted average sum on the actual measurement distance values so that a final practical distance is obtained; S05: carrying out position update on the positioned subject according to the final practical distance.
Owner:SHANGHAI JIAO TONG UNIV
Fast detection method of cell line CRISPR/Cas9 gene knock-out
InactiveCN107435069AThe positioning result is accurateReduce economic and time costsMicrobiological testing/measurementGenetic engineeringCost (economic)
The invention relates to a fast detection method of cell line CRISPR / Cas9 gene knock-out, and belongs to the technical field of genetic engineering. The cell genomic DNA (Deoxyribonucleic Acid) can be fast obtained by a direct lysis method; a fluorescence PCR (Polymerase Chain Reaction) technology and a capillary electrophoresis method based on a sequencer are combined; and the large-scale genotype identification can be precisely performed in a short time on monoclonal cells subjected to knock-out of a plurality of gene sites. The use of a kit for extracting the genomic DNA is not needed; the cell treatment time only needs 25 min; the economic cost and the time cost are greatly reduced; the sensitivity and the precision are very high; only a small amount of DNA is needed; and the difference of one basic group can be accurately detected. The DNA extraction is not involved, so that the detection and analysis can be performed through simple dilution, denaturation and capillary electrophoresis after the PCR is performed on a sample; and no complicated steps exist, so that the method is suitable for large-scale mass operation.
Owner:XINXIANG MEDICAL UNIV
Indoor positioning method and system
ActiveCN106162555AThe solution accuracy is not highOvercome the problem that the positioning accuracy is seriously disturbedLocation information based serviceNetwork planningTime delaysBuilding material
The invention relates to an indoor positioning method and system, wherein the indoor positioning method comprises the steps of primary distance measurement, and precise positioning after positioning range and distance correction, wherein the wall body combination with the smallest signal loss estimation is used as parameter correction distance measurement information so as to obtain the precise indoor positioning coordinate through calculation. By using the indoor positioning method and system provided by the invention, the fixed and unique building structure information in indoor environment is sufficiently used; the signal obtained through measurement is subjected to fitting according to different signal attenuation of different building materials of building structures and wall bodies; the optimum wall body combination with the smallest signal loss estimation error corresponding to each position region is found; the time delay information of wireless signal spreading interference by the wall body is obtained; the distance measurement value is thus corrected; the problem of low precision of the existing positioning algorithm due to blocking between various wall bodies in the indoor environment is solved. The method has the advantages that the complexity degree is proper, and the more precise positioning result in the indoor complicated environment can be obtained.
Owner:XIANGTAN UNIV
WIFI (wireless fidelity) network based RSSI (received signal strength indicator) signal strength secondary locating method and device
ActiveCN104125538AThe positioning result is accurateWireless commuication servicesWifi networkErrors and residuals
The invention provides WIFI (wireless fidelity) network based RSSI (received signal strength indicator) signal strength secondary locating method and device. The WIFI network based RSSI signal strength secondary locating method includes the stage of primary locating and the stage of secondary precise locating. The secondary precise locating specifically includes the steps of rejecting access points (AP) with high error according to information of all access points in a WIFI network, reselecting iteratively the access points with low error each time to guarantee the number of the effective access points is 90-95% of the total number, and correcting initial locating result iteratively continuously to obtain a more precise locating result. During the stage of the secondary precise locating, information of most of access points of the WIFI network is utilized and the access points with high error are rejected, reselection of the new initial coordinate is performed on the basis of the initial coordinate according to Taylor's formula, thus the obtained new initial coordinate is closer to the actual location. Besides, since most of the access points with low error are reselected iteratively each time and the initial locating result is corrected continuously iteratively, the more precise locating result is achieved.
Owner:CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
Anti-NLoS error locating method based on location unit quality and multi-algorithm data fusion
ActiveCN103476116AThe positioning result is accurateWireless communicationSignal-to-noise ratio (imaging)Chan's algorithm
The invention discloses an anti-NLoS error locating method based on location unit quality and multi-algorithm data fusion. The method comprises the following steps that a terminal to be detected acquires measuring values fed back by N anchor nodes, the measuring values comprise TOA, RSSI and signal noise ratio (SNR); a Kalman filter is used for processing the TOA measuring values, new TOA measuring values are obtained, the obtained TOA measuring values are divided into two groups, namely second TOA measuring values and TDOA measuring values; a mode searching method and a CHAN algorithm are used for carrying out location computing on the second TOA measuring values and the TDOA measuring values respectively; the weight value of a location unit is determined, the location results of the second TOA measuring values and the TDOA measuring values are respectively subjected to data fusion; the fusion location results of the second TOA measuring values and the fusion location results of the TDOA measuring values are subjected to fusion. According to the method, various kinds of information brought by the measuring values are fully used, integration is carried out through a data fusion method, and accurate location results can be obtained.
Owner:上海瀚芯实业发展合伙企业(有限合伙)
Method and device for controlling access right of mobile equipment
InactiveCN103491539AMeet application needsImprove securityNear-field transmissionSecurity arrangementTelecommunicationsWifi network
Provided are a method and device for controlling an access right of mobile equipment. The method comprises the steps that the position mark of the mobile equipment is acquired, the position mark is related to a close-range wireless network where the mobile equipment is located, and the close-range wireless network comprises at least one of a Wifi network, a Bluetooth network and an NFC network; the acquired position mark is compared with a position mark preset in the mobile equipment, and the access right of the mobile equipment is set according to a comparison result. According to the technical scheme, the method for controlling the access right of the mobile equipment has the advantages of being high in locating speed and high in safety performance, and is not prone to being lost and convenient to use.
Owner:SPREADTRUM COMM (SHANGHAI) CO LTD
Method of using intelligent mobile phone to assist indoor positioning
ActiveCN106714102AThe positioning result is accurateReduce energy consumptionNavigational calculation instrumentsLocation information based serviceWi-FiPressure sensor
The invention discloses a method of using an intelligent mobile phone to assist indoor positioning. The accuracy of indoor positioning is improved through accurately positioning the floor of a user. The method comprises steps: an air pressure change trajectory when the user moves in a building is monitored through an air pressure sensor of the mobile phone; when multiple users are in the same elevator or Wi-Fi reading of the multiple users is close, the air pressure sensors of the users are calibrated in pairs; the air pressure change trajectories of the users are all uploaded to a center server, the server combines the multiple trajectories, a trajectory map containing the air pressure value of each floor is obtained, and thus, according to the air pressure reading of the user, the floor of the user is positioned; and according to Wi-Fi signals around the user with the known floor, a Wi-Fi map corresponding to the floor is built, and the Wi-Fi map is used for positioning a floor for a user whose mobile phone is not provided with the air pressure sensor. the method can position the floor of the user in the current building, the indoor positioning range can be narrowed, and the positioning precision is improved.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Sound ray correction method and system based on water sound ultrashort baseline positioning system
ActiveCN107132520AWide pointing opening angleThe positioning result is accurateWave based measurement systemsPhase differenceSelf adaptive
The invention provides a sound ray correction method based on a water sound ultrashort baseline positioning system. The method comprises the following steps: obtaining an initial glancing angle theta0 through a quaternary cross-shaped stereoscopic water sound ultrashort baseline positioning system; measuring the sound velocity profile through a sound velocity profiler; carrying out the sound ray correction iteration on the basis of the sound velocity profile in a mode of layer adding according to the initial glancing angle theta0 through the quaternary cross-shaped stereoscopic water sound ultrashort baseline positioning system, so as to solve the coordinates of each detection point relative to a measurement ship. According to the invention, the method obtains a phase difference estimation value according to a quaternary stereoscopic water sound ultrashort baseline array, and the iteration is carried out through employing an adaptive layered adding method, thereby solving the coordinates of each detection point relative to the measurement ship. Compared with a conventional mean sound velocity algorithm, the method greatly improves the range finding precision, effectively corrects a curved propagation path of sound rays in an underwater complex environment, and improves the underwater range finding and positioning precision of the water sound ultrashort baseline positioning system.
Owner:江苏中海达海洋信息技术有限公司
Map matching-assistant indoor positioning method
ActiveCN103369466AThe positioning result is accurateWireless commuication servicesComputer Aided DesignComputer science
The invention discloses a map matching-assistant indoor positioning method which relates to a map matching-assistant positioning method and is used for solving a redundant calculation problem which is caused by additional measurement data from a sensor and an iterative algorithm searching process which are required by an existing indoor map matching algorithm. The method comprises the steps of: arranging access points and reference points in an indoor target positioning environment and building a position fingerprint database; utilizing a computer-aided design (CAD) plan of a floor to be positioned to generate an image array Imatch for loading a floor plan image of a point-line model; calculating positioning coordinates of test points as positioning results; converting the positioning coordinates into pixel points, judging whether a building body, blocking a midpoint of the nth pixel point and the (n-1)th pixel point, exists between the nth pixel point and the (n-1)th pixel point, searching for the pixel point which is positioned on the point-line model and is nearest to the point, and utilizing the nearest pixel point as a revised positioning pixel point; and converting the obtained positioning pixel point into practical position coordinates, and completing indoor positioning. The method can be widely applied to indoor positioning.
Owner:严格集团股份有限公司
Natural gas pipeline leakage positioning method and device
ActiveCN107228282AHigh positioning accuracyThe problem of suppressing modal aliasingCharacter and pattern recognitionPipeline systemsDecompositionData signal
The invention provides a natural gas pipeline leakage positioning method and device. The method includes the steps that data signals are acquired on two sampling points of a natural gas pipeline by means of a sensor, and the first data signal and the second data signal are acquired; by means of an ELMD algorithm, the first data signal and the second data signal are decomposed, and the effective PF component of the first data signal and the effective PF component of the second data signal are acquired; and by means of the effective PF components of the first data signal and the second data signal, a time delay value between the first data signal and the second data signal is determined, and a pipeline leakage position is determined according to the time delay. According to the natural gas pipeline leakage positioning method and device, data acquired by the sensor are subjected to decomposing treatment by means of the ensemble local mean decomposition algorithm, the effective PF components of the data signals are acquired, and therefore the positioning precision of pipeline leakage is greatly improved.
Owner:广西广投燃气有限公司
Location measurement information interaction method, system, base station and wireless network controller
ActiveCN101459930AAchieve interactionEffective interactionWireless communicationSmart antennaWireless network
The invention discloses a method and a system for positioning metrical information exchange, a key station and a wireless network controller. The key station sends positioning metrical information measured by a plurality of positioning metrical units to the wireless network controller which feeds back to the key station with a plurality of positioning metrical feedback information, thereby realizing exchange of the positioning metrical information between the key station and a RNC. The scheme provided by the invention can realize rapid and effective exchange of a plurality of positioning metrical information on an Iub interface when a plurality of intelligent antennas are employed in a community, even when a plurality of channels in a community simultaneously support a new applying circumstance of channelizing application and intelligent antennas application.
Owner:DATANG MOBILE COMM EQUIP CO LTD
Dynamic target positioning system and method with RFID and laser information integrated
InactiveCN108614980AAchieve positioningThe positioning result is accurateMemory record carrier reading problemsSensing by electromagnetic radiationEngineeringLaser sensor
The invention discloses a dynamic target positioning system and method with RFID information and laser information integrated. A particle filter is used to integrate RFID signals and laser signals, thereby realizing accurate positioning on a dynamic target. The information acquired by the laser sensor is subjected to clustering processing, and the information after laser clustering at adjacent time is processed as a target speed. The RFID label signal intensity and the label phase information are acquired at the same time, the acquired signal intensity information is integrated to a particle filter updating stage, and the phase information at the adjacent time is processed as a target speed. Finally, the speed estimated by the laser information after clustering is matched with the speed estimated by the RFID phase, the best matched speed is selected and integrated in the article filter updating stage, and thus, a moving target can be positioned more accurately.
Owner:SOUTHWEAT UNIV OF SCI & TECH
Automatic guided vehicle dual-lidar control method and system and positioning method
InactiveCN107505940AReduce blind timeImprove autonomous navigation accuracyPosition/course control in two dimensionsBlind zoneRadar
The invention provides an automatic guided dual-lidar control method and system and a positioning method. The method comprises the steps that two sets of distance data of two lidars arranged on an automatic guided vehicle are acquired respectively; two lidars include a first lidar and a second lidar, and two sets of distance data include a first set of distance data and a second set of distance data; based on at least one set of distance data in two sets of distance data of two lidars, whether the first lidar is in a radar dead zone is determined; and the operation mode or signal processing mode of at least one lidar in two lidars is controlled according to the status of the blind zone in which the first lidar is located. According to the invention, in the navigation process of the automatic guided vehicle, enough information are collected by two lidars; the operation mode and / or signal processing method of two lidars is controlled to reduce the time of blindness of the AGV; the autonomous navigation accuracy and intelligence of the AGV are improved; and the work efficiency is improved.
Owner:SUGAN TECH BEIJING +1
Leakage detection method and the leakage detection device based on combination of wavelet and EMD reconstruction
ActiveCN107461611ASimple calculationEfficient separationDetection of fluid at leakage pointPipeline systemsSTM32Correlation analysis
The invention discloses a leakage detection method and a leakage detection device based on a combination of a wavelet and EMD reconstruction. The pipeline leakage detection device takes an STM32 single-chip microcomputer as a core, and mainly comprises a sensor, an amplifier, a filter, an A / D conversion module and a transmission module. After the pipeline leakage detection device collects data, the data are transmitted to a computer through a wireless communication module; the computer uses Matlab software to carry out denoising processing on the collected data by combining the wavelet universal threshold denoising and the EMD reconstruction of a multi-azimuth neighborhood mode, positioning is carried out through correlation analysis, so that the position of a pipeline leakage point is obtained. According to the leakage detection method and the leakage detection device, noise can be effectively removed, useful signals can be extracted, and therefore the accuracy of positioning the pipeline leakage point is remarkably improved.
Owner:NANJING UNIV OF POSTS & TELECOMM
High-precision three-dimensional positioner for wireless sensor network node
InactiveCN102325370AHigh positioning accuracyLow densityEnergy efficient ICTNetwork topologiesWireless sensor networkingErrors and residuals
The invention belongs to the technical field of own positioning of a wireless sensor network node and particularly relates to a high-precision three-dimensional positioner for a wireless sensor network node. Firstly, a three-dimensional target function in which a reciprocal of a range error is used as a weight is defined; during solving of range equations, an equation with a minimum ranged value is selected as a public power decreasing equation which has the lowest probability of noise pollution; power decreasing is realized by subtracting the selected public power decreasing equation from other equations in the range equations; then optimized solving is performed on the target function by using a particle swarm optimization method; and finally, the acquired optimal solution is used as a coordinate of an unknown node. The three-dimensional positioner is high in positioning precision, the method is simple and easy to implement, and the three-dimensional positioner has the advantages of higher error tolerance capability and good application prospect.
Owner:SHANDONG UNIV AT WEIHAI
Wireless network positioning method based on RSSI (Received Signal Strength Indicator)
InactiveCN105430745AAccurate schedulingReduce mistakesWireless communicationUltrasound attenuationReceived signal strength indication
The invention relates to a wireless network management positioning technology and discloses a wireless network positioning method based on an RSSI (Received Signal Strength Indicator), so that an error based on an RSSI wireless network positioning algorithm in a wireless network management system is reduced and a precise position of an STA (Station) is obtained. The method comprises the following steps of a establishing a coordinate system at a wireless network area of one plane and determining positions of all APs (Wireless Access Point); b computing a signal attenuation index lambda value in a wireless signal attenuation model to obtain an optimized wireless signal attenuation model; and c screening an optimal RSSI value of the target STA at the different APs and combining the optimized wireless signal attenuation model to solve the position of the target STA. the method is suitable for wireless network positioning.
Owner:MAIPU COMM TECH CO LTD
Sensing system for unmanned platform
ActiveCN109682373ARealize self-positioningAchieve seamless positioningNavigational calculation instrumentsNavigation by speed/acceleration measurementsLaser dataLaser sensor
The invention discloses a sensing system for an unmanned platform. The sensing system comprises a laser sensor for acquiring laser data and detecting an obstacle, a laser algorithm module comprising afirst front-end position estimation module and a first back-end position estimation module, a visual sensor for acquiring image data, a visual algorithm module comprising a second front-end positionestimation module and a second back-end position estimation module, a fusion positioning module for acquiring the position and speed of the unmanned platform in an indoor environment, a satellite positioning module for acquiring the position and speed of the unmanned platform in an outdoor environment, an indoor and outdoor switching navigation algorithm module for conducting switched selection ofdifferent positioning methods and transmitting the real-time position and speed of the positioned unmanned platform to the unmanned platform, and an environmental map establishment algorithm module for establishing a map, extracting obstacle information with the map and sending the obstacle information to the unmanned platform. The sensing system has the advantage of realizing autonomous positioning in the indoor and outdoor environments and in the indoor and outdoor environment switching process.
Owner:COMP APPL TECH INST OF CHINA NORTH IND GRP
CDMA mobile target handheld detecting device and detecting method
InactiveCN101072440AImprove detection accuracyNarrow location areaPosition fixationRadio/inductive link selection arrangementsComputer moduleComputer terminal
Technical scheme of the invention is as following: direction-finder antenna (DFA) captures signal of public channel in forward direction (FD) of service base station of CDMA mobile target; communication module (CM) constructs target reference signal based on content message body in public channel in FD; dumb call module carries out dumb calling to target terminal to be positioned; DFA captures reverse access signal (RAS); CM decodes the access signal based on constructed reference signal, and captures ID number of mobile user in message body of RAS; control process unit determines ID of mobile target (MT) to be measured, and carries out estimating positional parameter; the position calculation module computes position of target, and further accomplishes relative positioning tracking for MT to be measured. Features are: flexible and convenient, high real time and validity etc. The method is suitable for positioning operation at mountainous area and place with dense buildings.
Owner:CHONGQING UNIV OF POSTS & TELECOMM
Target positioning method under random deployment of wireless sensor network
ActiveCN103529427AThe positioning result is accuratePosition fixationWireless mesh networkWireless sensor networking
The invention discloses a target positioning method under random deployment of a wireless sensor network. The target positioning method under random deployment of the wireless sensor network specifically comprises the following steps of 1) constructing a wireless sensor network; 2) collecting reference data; 3) detecting the RSSI (received signal strength indicator) value of each link in real time; 4) selecting three affected links, and determining a target possible position area according to three different distribution situations of a point of intersection formed by the three selected links; 5) according to the RSSI estimation values of three links when the target is on M*N possible position points and the practically measured RSSI values of the three links, determining the target position. The method disclosed by the invention can adapt to the complex and changing field environment without rule deployment of a wireless sensor network node, the target in the large-scale scene area is subjected to detection positioning under the condition of the random deployment of the wireless sensor network, time and labor are saved, the positioning result is accurate, and the target positioning method under random deployment of the wireless sensor network has a good application prospect.
Owner:西安华通天地信息科技有限公司
Multi-source data fusion real-time navigation positioning method and system
InactiveCN110988951AThe positioning result is accuratePrecise positioningNavigation by terrestrial meansNavigation by speed/acceleration measurementsReal time navigationEngineering
The invention discloses a multi-source data fusion real-time navigation positioning method and system. The method comprises: acquiring GNSS data, GNSS operation data broadcasted by IGS, IMU data, magnetic intensity data and mileage data; calculating the current position and speed according to the GNSS data and the GNSS operation data; achieving position and speed initialization according to the current position and speed, and achieving posture initialization according to IMU data to obtain a posture initialization result; performing inertial navigation state updating based on the pose initialization result to obtain a pose updating result; checking whether GNSS data, obtaining magnetic intensity data or mileage data at each measurement moment of the inertial measurement unit or not, and selecting time updating or observation updating of Kalman filtering according to a checking result to obtain a parameter correction vector; and correcting the pose updating result by utilizing an errorfeedback theory based on the parameter correction number vector to obtain navigation positioning information. According to the invention, the positioning precision in a signal unlocking environment can be improved.
Owner:CHINA UNIV OF GEOSCIENCES (BEIJING)
Method and device for determining position range of mobile terminal
ActiveCN102595591AThe positioning result is accurateWireless communicationHome basedComputer science
The invention discloses a method and a device for determining position range of a mobile terminal. The method comprises the following steps of: determining a plurality of position ranges from which the distance to the position of a base station meets a preset distance condition; determining the signal intensity of a sampling terminal at each sampling point of the corresponding base station; based on the determined signal intensity of each sampling point and the plurality of position ranges, building a corresponding relation between a plurality of signal intensity ranges and the plurality of position ranges; and based on the built corresponding relation, determining the position range corresponding to the signal intensity range of the current signal intensity of a to-be-positioned mobile terminal as the position range of the to-be-positioned mobile terminal of a home base station. With the scheme provided by the embodiment of the invention, the accuracy of positioning the position range of the mobile terminal based on the position of the base station is improved.
Owner:CHINA MOBILE COMM GRP CO LTD
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