300 results about "Wireless positioning" patented technology

The invention belongs to the technical field of wireless positioning, and discloses a non-line-of-sight interference-resistant dynamic positioning method and a base station layout method for positioning. Comprising the following steps: calculating original distance measurement results of each initial base station in a label and a sub-region, obtaining current shielding probability and current signal intensity of the initial base station and current geometric accuracy factors of different initial base station combinations in an initial base station set, selecting candidate base stations, calculating information gain of each candidate base station pair, and obtaining the information gain of each candidate base station pair; selecting candidate base stations with information gains meeting preset requirements to construct a target base station subset, inputting an original ranging result of the target base station subset into a Kalman filter based on a motion state space model for processing, and compensating an NLOS time delay error through a sliding window mean value to obtain a positioning result of a label and an NLOS time delay error estimation value, the problem that the positioning result is not accurate enough in a complex environment is solved.

The invention relates to the technical field of evacuation intelligent simulation, in particular to a fire-fighting evacuation path dynamic planning method and system based on digital twinning. In the fire-fighting evacuation path dynamic planning method and system based on digital twinning, a digital twinning environment containing multi-dimensional real-time sensing data such as temperature, smoke and heat radiation intensity is constructed; the method can dynamically analyze space-time evolution characteristics such as fire spreading trend and heat accumulation, further carries out accurate quantitative evaluation on the danger level of each segment of an evacuation path, and meanwhile, integrates video monitoring and wireless positioning information to grasp the specific positions and moving tracks of people in a building in real time, thereby improving the safety and reliability of the evacuation path. The actual flow bottleneck is identified based on the flow direction consistency, the distribution density and the congestion condition of the crowd, and finally, the dynamic danger of the fire environment and the macroscopic flow trend of the crowd are combined, and the passage cost value of each path section is subjected to dual dynamic correction, so that the flow rate of the crowd is improved. And an evacuation path planning result giving consideration to fire hazard avoidance and crowd congestion evacuation is generated, so that the real-time performance and safety of evacuation decision making are effectively improved.

The invention relates to the technical field of wireless positioning, and provides a high-speed rail user positioning method and system based on trajectory compensation, and the method comprises the steps: recognizing high-speed rail users, carrying out the data preprocessing, constructing high-speed rail grids, and generating a signal fingerprint database; preliminarily screening out a plurality of candidate grids according to RSRP and TA signal features reported by high-speed rail users in real time; based on the service cell switching sequence, a hidden Markov model or particle filtering is adopted for motion trail modeling, and the advancing direction and speed of a train are recognized; introducing a multi-source information fusion and grid compensation strategy; and selecting a final positioning result from the candidate grids in a weighted voting mode, and outputting grid IDs and latitude and longitude coordinates. Through multi-source data fusion, track compensation and intelligent decision making, the positioning precision and reliability of the high-speed rail user in a complex mobile environment are remarkably improved, and the method has important technical popularization value.

The application provides an angle of arrival measurement method, an electronic device, a readable storage medium and a chip, and relates to the technical field of wireless positioning. The method is applied to an electronic device, and the electronic device comprises a first antenna and a second antenna. The antenna radiation field patterns of the first antenna and the second antenna are similar within a first angle range around the electronic device and are not similar within a second angle range around the electronic device. The method comprises the following steps: determining the difference between target parameters measured by the first antenna and the second antenna according to a wireless signal; determining the angle of arrival range of the wireless signal according to the difference; wherein the angle of arrival range is the first angle range or the second angle range; and measuring the angle of arrival of the wireless signal by using the first antenna and the second antenna according to the angle of arrival range. The technical scheme provided in the embodiment can improve the accuracy of angle of arrival measurement.

This disclosure provides methods, devices and systems for wireless positioning. An example method includes determining a first received signal strength indicator (RSSI) signature, the first RSSI signature including a respective RSSI associated with each access point (AP) of a first plurality of APs, where the first plurality of APs form at least a portion of a mesh network of APs, comparing the first RSSI signature with each reference RSSI signature of a first plurality of reference RSSI signatures, each reference RSSI signature of the first plurality of reference RSSI signatures including a respective RSSI associated with each AP of the first plurality of APs, and identifying a first position of the wireless STA based on the comparing of the first RSSI signature.

The invention discloses a high-precision indoor positioning system based on a smart bracelet, and the system comprises a data processing module which is used for obtaining and preprocessing multi-source sensing data collected by the smart bracelet; the gait reckoning module is used for executing gait event detection and pedestrian dead reckoning processing; the wireless observation module is used for carrying out preprocessing and credibility evaluation on indoor wireless positioning observation data; the fusion positioning module is used for carrying out credibility weighted fusion; the trajectory constraint module is used for applying trajectory rationality constraint and correcting abnormal position points; the error correction module is used for constructing a positioning error dynamic correction model and executing online correction processing; and the track output module is used for carrying out smoothing and time resampling processing and extracting a human body position determination result set. The method is based on the multi-source perception fusion and federated Kalman dynamic correction method, achieves the indoor high-precision positioning of the smart bracelet, and has the advantages of continuous track, controllable error and high environmental adaptability.

The invention discloses an ultra wide band (UWB) robust positioning method for a non-line-of-sight (NLOS) interference environment, and belongs to the technical field of wireless positioning. According to the method, firstly, all three-base-station combinations are generated through a permutation and combination method, the initial position of each group of base stations is solved through a trilateral positioning method, and a multi-dimensional coarse positioning point cloud is formed; then grouping the coarse positioning points according to the resolving participation condition of the base stations, acquiring representative position points of the base stations by adopting a central position estimation algorithm, and constructing a base station space distribution model; a mean vector and a covariance matrix of the point cloud are calculated, after a pseudo-inverse matrix is solved through SVD decomposition, the mahalanobis distance from each representative point to the distribution center is calculated, a dynamic threshold value is set according to the 95% confidence coefficient of chi-square distribution, a base station with the distance exceeding the threshold value is judged as an NLOS abnormal node, and data of the base station is abandoned; and finally, constructing a dual-stage anomaly suppression mechanism: screening reliable base stations based on geometric consistency at a measurement stage, dynamically adjusting the Kalman gain through an exponential gain constraint factor at a residual stage, constructing a dynamic noise model by fusing a geometric precision factor, and realizing position calculation by adopting improved extended Kalman filtering. According to the method, the positioning error can be effectively reduced in the NLOS interference environment, and a centimeter-level reliable positioning solution is provided for the fields of industrial Internet of Things or indoor positioning and the like.

The invention discloses a dynamic positioning precision optimization system based on a self-learning fusion model, and relates to the technical field of wireless positioning. Comprising the steps that an acquisition and synchronization module synchronously acquires AOA, RSSI and TOA signals from a plurality of anchor points and generates a synchronous multi-source signal flow; the discrimination module extracts multi-dimensional instability characteristics such as fluctuation entropy, angle jitter and delay abrupt change rate of the signal flow, and classifies the current channel environment into predefined modes such as high occlusion, non-line-of-sight error or stable line-of-sight; the mapping module calls a corresponding weight distribution strategy according to the modal identifier to generate a real-time fusion weight vector; the adaptive positioning module couples the weight vector to an unscented Kalman filter observation model, dynamically adjusts the weight of each signal source in state updating, and outputs an estimated position and a positioning confidence coefficient; the optimization module monitors the positioning confidence and iteratively optimizes the weight strategy online based on the deviation of the positioning confidence from the target value. The method effectively improves the positioning precision and robustness in a complex dynamic scene.

The invention relates to the technical field of wireless positioning, in particular to a dynamic-dynamic TDOA (time difference of arrival) cooperative positioning method based on an unmanned aerial vehicle-mounted mobile base station. The method comprises the following steps: constructing a cooperative sensing network comprising at least four unmanned aerial vehicles carrying unmanned aerial vehicle-mounted base stations, and realizing microsecond-level high-precision time synchronization of the whole network through a bidirectional distance measurement technology in combination with an introduced clock error model. All the base stations receive signals transmitted by the moving target to be measured under the unified time base, the arrival time is recorded, and a TDOA measurement value is calculated with the main node base station as the reference. And based on the group of TDOA measurement values, tracking and positioning the to-be-measured moving target by adopting an extended Kalman filtering algorithm, and estimating and outputting the three-dimensional position and speed of the to-be-measured moving target in real time by linearizing the nonlinear model. The method effectively overcomes the technical problems of difficult time synchronization and serious error coupling in a dynamic-dynamic scene, and has the advantages of being independent of ground infrastructure, high in positioning precision, strong in robustness and remarkable in cooperative gain.

The invention relates to a multi-source positioning and inertial navigation fused work card high-precision positioning method. The method comprises the following steps: acquiring observation data of at least two heterogeneous wireless positioning modules and inertial navigation data of an IMU (Inertial Measurement Unit) in real time; based on observation data quality evaluation and motion state recognition, a fusion strategy defining the weight of each data source is generated in a self-adaptive mode; performing space-time alignment and fusion on the data according to the strategy, and outputting a positioning result; and finally, performing two-stage compensation and closed-loop feedback on IMU accumulated drift by using the result. According to the invention, through an environment adaptive fusion strategy and closed-loop error compensation, the problems of insufficient positioning precision, poor stability and short endurance in a complex industrial scene are effectively solved, and the positioning effects of high precision, high robustness and low power consumption are realized.

The invention discloses a high-precision plant personnel and equipment positioning system resistant to a complex industrial environment, belongs to the technical field of high-precision wireless positioning, and aims at high efficiency and safety requirements of plant personnel and equipment management and stereoscopically positioning plant personnel, equipment and foreign visitors by utilizing technologies such as UWB (Ultra Wideband) and the like. The system comprises a multi-scene applied positioning label, a positioning base station and a 24-hour automatic monitoring and positioning management and control platform. According to the invention, the positioning label can be accurately positioned by using a bidirectional distance measurement method and a multi-base-station fusion differential positioning algorithm, so that corresponding personnel and equipment are positioned, more accurate positioning data are obtained, deep services such as key area alarm, automatic attendance checking, SOS one-key calling for help and factory planning upgrading can be provided on the basis of the positioning data, and the positioning accuracy is improved. The aim of personnel management efficiency can be achieved with low cost, and powerful safety guarantee can be provided for high-risk field work.

The invention discloses a screen candid shooting prevention monitoring method and system based on multi-mode model fusion, and relates to screen privacy protection.The method comprises the steps that firstly, multi-source data from a video mode, a wireless positioning mode, an environment light intensity mode, an audio mode and a peripheral behavior mode are acquired through a data acquisition module; and the data enhancement module is used for enhancing the source data. Then, feature extraction is carried out on the enhanced multi-modal data, and corresponding multi-modal feature representation is obtained; and inhibiting inter-modal redundant information through an adaptive feature enhancement module, highlighting significant features related to candid photographing behaviors, and generating optimized fusion features. And on the basis of the optimized fusion features, a multi-task learning architecture module is adopted to simultaneously predict a device category, a user behavior category and whether a secret photographing behavior exists or not. According to the method, multi-modal data can be fully fused, the accuracy and robustness of screen candid shooting prevention detection are improved, and the method is suitable for real-time security monitoring of multiple scenes and multiple types of terminals.

The invention relates to the technical field of wireless positioning, and discloses a wireless personnel positioning method and system through a positioning tag card. The method comprises the following steps: acquiring an original measurement value of a multi-band signal in a positioning tag card, and extracting an interfered band combination based on the original measurement value; carrying out fluctuation modeling on the frequency band combination by adopting field intensity detection, generating a fluctuation feature vector, carrying out weather type classification based on the fluctuation feature vector, and determining a rainy day attenuation calculation mode; adjusting the signal intensity according to a rainy day attenuation calculation mode, obtaining adjusted signal intensity data, calculating a distance estimation value, and generating a distance parameter set; and performing triangulation positioning according to the distance parameter set, generating a real-time position coordinate, matching the real-time position coordinate with historical trajectory data, adjusting a compensation coefficient of the compensation model, and generating an optimized positioning result by using the adjusted compensation model. According to the invention, the continuity and accuracy of wireless positioning are improved.

The invention discloses a same-frequency direction-finding positioning method and system based on an RFSOC, and relates to the technical field of wireless communication. The method comprises the following steps: transmitting a same-frequency positioning signal by using double transmitting ends with the interval of a preset fixed distance L1, and receiving the same-frequency positioning signal by using double receiving ends with the same interval of L1; then, respectively calculating the distance difference L2 and L3 from each receiving end to the two transmitting ends according to the signals received by the receiving ends; then, determining respective motion tracks of the two receiving ends as a first hyperbolic curve and a second hyperbolic curve based on the distance difference; and finally, combining the trajectory equations of the two hyperbolic curves, and combining a constraint condition that a fixed distance L1 is kept between the double receiving ends to solve the real-time coordinates and orientation of the receiving device. According to the invention, by constructing the single-station double-transmitting and double-receiving geometric model, the problems that the wireless positioning direction finding technology generally depends on a plurality of geographically dispersed base stations, the system deployment is complicated, and the requirement on high-precision time synchronization among equipment is strict in the prior art are solved.

A wireless locating system and method include receiving first messages at a server. The first messages include bed location data entered manually on a user interface of a first patient bed. The first messages also include signal strength data from a plurality of wireless access points in communication with the first patient bed. A first signal strength profile for the first patient bed at a first location is built by the server. The first patient bed is removed from the first location and a second bed is moved into the first location. The second patient bed does not have manual location data entry capability. A second signal strength profile is built by the server for the second patient bed. The server compares the second signal strength profile with the first signal strength profile and determines that the second patient bed is at the first location if the second signal strength profile matches the first signal strength profile.

Disclosed are techniques for wireless positioning. In some aspects, a user equipment (UE) may obtain one or more positioning measurements of a first tracking reference signal (TRS) transmitted in a first TRS occasion, wherein the first TRS occasion is a TRS occasion of a first TRS configuration or a second TRS configuration, wherein the first TRS occasion is greater than a minimum limit and less than a maximum limit before a next paging occasion (PO). The UE may perform an over-the-top (OTT) positioning operation, an OTT crowdsourcing operation, or any combination thereof, based on the first TRS occasion.

The invention discloses a positioning error compensation method and device for a UWB single base station positioning system, and relates to the technical field of wireless positioning, and the method comprises the steps: taking a single base station as a center, determining an equilateral triangle according to the wavelength of a UWB signal, and setting a UWB antenna at each vertex of the equilateral triangle, so as to form an equilateral triangle array antenna; calculating the arrival angles of the received signals by different UWB antennas by using the phase differences of the UWB signals arriving at the UWB antennas through a signal processing algorithm and combining the geometrical relationship of the equilateral triangle array antennas; constructing an equation set in combination with triangular constraint conditions; solving the equation set by using a weighted least square method to obtain initial position information of the positioning tag; and smoothing the initial position information by using Kalman filtering to obtain the position information of the positioning tag. According to the invention, the special antenna array structure is constructed on the single base station, and the information carried by the UWB signal is fully mined by using the triangulation positioning principle, so that the positioning precision is improved.

The invention provides a waterproof GPS positioning structure for marine survey and a use method thereof, and relates to the technical field of GPS positioning, the waterproof GPS positioning structure comprises a waterproof protection part, a wireless GPS positioner, a movable protection part, an installation prompting part and a connection stabilizing part; the wireless GPS positioner is mounted in the waterproof protection piece; the movable protection piece is mounted on the waterproof protection piece; the installation prompting piece is installed at the bottom of the waterproof protection piece. The connection stabilizing piece is installed on the installation prompting piece, and the connection stabilizing piece is used for improving the stability of the installation prompting piece after connection; external pressure preferentially extrudes the four movable protection discs to slide, and it is guaranteed that the joint of the waterproof protection shell a and the waterproof protection shell b does not deform basically; the problem that the original sealing effect cannot be guaranteed due to the fact that the GPS positioning structure is prone to deformation at the joint when moving to a deeper position in the ocean due to the fact that the waterproof protection function is not achieved generally is solved.

The application belongs to the technical field of wireless positioning, and particularly relates to a synchronization positioning and mapping method based on millimeter wave communication multipath transmission signals. By establishing a multi-antenna virtual base station model, non-line-of-sight paths are equivalent to virtual line-of-sight paths transmitted by the multi-antenna virtual base station, the state of the virtual base station is described by position and azimuth angle, thereby simplifying the relationship between the geometric parameters of the non-line-of-sight transmission path and the state of the user, and the measurement information of the non-line-of-sight path transmission signals is more effectively utilized; secondly, the multi-antenna virtual base station is regarded as a map feature in a spatial radio frequency environment, a mobile user synchronization positioning and mapping algorithm based on millimeter wave multipath parameter measurement is proposed, the multipath parameter measurement set and the map feature set are modeled as a random finite set, and a probability hypothesis density filter is used to estimate the map, thereby significantly improving the synchronization positioning and mapping performance in the dense clutter and sensor missed detection scenarios.

The application relates to the cross-technology field of satellite navigation and wireless positioning technology, in particular to a real-time dynamic high-precision positioning method based on tight coupling of Beidou and UWB, solves the problem that error coupling in Beidou and UWB observation data is not fully solved in the prior art, and in particular under a high-speed dynamic scene, the mutual influence of Beidou receiver clock error, UWB base station clock error and multipath error leads to continuous accumulation of errors, and the positioning precision is significantly reduced. A real-time dynamic high-precision positioning method based on tight coupling of Beidou and UWB comprises a data preprocessing and space-time alignment module, an error joint estimation model, a rapid ambiguity fixing algorithm, a geometric constraint enhanced positioning engine module and a dynamic coordinate conversion and fusion output module. The method disclosed in the application adopts a highly integrated multi-model Kalman filter architecture to realize synchronous and accurate compensation of Beidou receiver clock error, UWB base station time delay and multipath effect.

The invention discloses a spatial positioning method based on signal strength indication, which relates to the technical field of wireless positioning and comprises the following steps of: 1, constructing a positioning network comprising positioning nodes and positioning base stations; 2, the central positioning base station communicates with other common positioning base stations, and meanwhile, the central positioning base station sets space coordinates and communication channels of all the positioning base stations; step 3, the positioning base station immediately feeds back the data to be sent to the positioning node when receiving the position requirement data of the positioning node; and step 4, the positioning node exchanges data with the nearest positioning base station through the channel n. According to the method, the antenna design is optimized, the RSSI positioning precision is further improved, a foundation is laid for data exchange between the positioning node and the positioning base station through the optimized design of the RSSI algorithm, and under the condition of integrating factors such as cost and power consumption, certain positioning precision is guaranteed, and real-time data uploading is achieved.

The invention relates to the technical field of anti-theft monitoring, and particularly discloses a selenium-rich water equipment anti-theft system based on wireless positioning and tracking. The system comprises an environment perception and data acquisition module, a multi-source positioning fusion resolving module, an anti-theft decision engine module and an execution and communication module, and realizes full-scene continuous high-precision positioning of equipment by fusing GPS, inertial navigation, ultra wide band and geomagnetic sensing data and combining extended Kalman filtering and dynamic observation model switching; based on the behavior pattern library and the multi-level risk assessment model, intelligent abnormity judgment is carried out, and graded early warning is executed through local alarm and remote communication. According to the system, the continuity, reliability and environmental adaptability of equipment theft prevention are effectively improved.

The invention discloses a non-line-of-sight positioning method based on obstacle vectorization and distance measurement cross validation, which belongs to the technical field of wireless positioning and comprises the following steps: step 1, calculating a height difference according to the installation height of a base station and the preset height of a to-be-estimated label, and calculating a plane projection distance value according to the height difference and a TOF distance measurement value; 2, constructing a signal path according to a to-be-estimated label positioning result at the previous moment and the position of each base station, judging the penetration condition of the path by combining a vectorized obstacle map, and performing compensation and reliability screening on the plane projection distance based on the penetration condition to obtain a credible distance measurement value set; 3, solving and calculating a positioning residual error through multi-base-station combined positioning, and carrying out weighted fusion on a solving result according to the residual error to obtain an initial positioning result at the current moment; according to the invention, high-precision positioning can still be kept near the base station and in complex scenes such as multi-shielding and the like, and the application requirement of a shielding environment is met.

The invention discloses a space station material management method and system based on image auxiliary identification and positioning, and belongs to the field of space station material management. The on-orbit server preprocesses the data, including key frame extraction and human body interference elimination, and generates material space position information in combination with an in-cabin three-dimensional positioning identifier; the processed data is transmitted to a ground server through air-ground communication for image-text recognition and service logic matching; and finally, returning the identified and confirmed material identity and position information to an on-orbit system updating database. According to the invention, the problems of identification blind areas, low operation efficiency, failure of wireless positioning technology and the like of the traditional two-dimensional code / RFID technology in a special environment of a space station are effectively solved, automatic identification and accurate positioning of code-containing and code-free materials are realized, the operation load of astronauts is significantly reduced, and the efficiency and reliability of material management are improved.

The invention relates to the technical field of wireless positioning, and discloses a method and device for assisting satellite positioning based on a low-power-consumption beacon. The method comprises the following steps that: a terminal scans and receives a signal broadcasted by a fixedly deployed low-power-consumption beacon, automatically switches from a satellite positioning mode to a beacon positioning mode when the signal strength meets a set condition, obtains a unique identifier of the beacon, uploads the unique identifier to a positioning platform, receives and displays accurate position information which is returned by the platform and is bound with the identifier, and sends the accurate position information to the terminal; the satellite positioning module is continuously in a closed or low-power-consumption state in the process. And when connection with the single beacon cannot be established, the terminal starts a multi-beacon auxiliary positioning mode, and data fusion is carried out on the signal intensity of the multiple beacons through the platform to calculate and estimate the position. According to the invention, high-precision, low-power-consumption and full-automatic positioning in a weak satellite signal area is realized, and the cruising ability of the terminal and the reliability of the positioning system are effectively improved.

This application provides a method and apparatus for generating an environmental map, relating to the field of wireless positioning technology. The method includes: acquiring an environmental map of a target area; acquiring the relative position coordinates of a wireless device in the target area, the relative position coordinates indicating the position of the wireless device relative to a positioning device in the target area; and marking the position of the wireless device on the environmental map based on the relative position coordinates of the wireless device and the absolute position coordinates of the positioning device in the target area. This application can conveniently obtain an environmental map marked with the positions of wireless devices, improving the practicality of the environmental map and the level of intelligence in users' lives.

The invention relates to the technical field of security and protection monitoring, and discloses a security and protection monitoring alarm linkage processing method and system. The method comprises the following steps: constructing a three-dimensional scene graph of a monitoring area; obtaining visual position information and wireless positioning information of a target, and executing constrained Kalman filtering fusion to obtain a target position; mapping the target position to the three-dimensional scene graph for threat assessment to obtain an intelligent alarm signal; and performing linkage control in the three-dimensional scene graph based on the intelligent alarm signal to obtain an equipment activation instruction and a blocking strategy. According to the method, high-precision three-dimensional target positioning is realized in a complex environment, an alarm decision strategy can be dynamically optimized according to historical statistical data, the problem of high false alarm rate caused by a fixed threshold mode is effectively reduced, and the stability and the reliability in different environment conditions are improved.

This invention discloses a combined positioning system and method for long-range non-cooperative wireless positioning (NWL) and inertial navigation (INS) systems. First, the NWL system estimates parameters of the NWL signals and combines this with Time of Arrival (TOA) and Least Squares (LS) methods to achieve wireless positioning for the receiver. Then, by combining the NWL system with an inertial navigation system (INS), a tightly coupled NWL / INS positioning system is proposed. This system leverages the short-term high accuracy of INS and the superior positioning and fault-tolerant performance of the combined navigation system to further enhance the system's positioning performance. The proposed NWL / INS combined system provides a long-range, high-precision positioning system using NWL signals, laying the foundation for long-range wireless navigation in GNSS rejection situations.

The invention discloses a kart positioning device, a pose recognition subsystem and a projection interaction system, belongs to the technical field of kart game equipment, and particularly relates to a kart CAVE projection interaction system with an ultra-large space. The method solves the problem that in a CAVE projection interaction scene of a kart with an ultra-large space, the projection interaction scene is not The problems that when the kart is positioned and recognized, a visual recognition scheme based on a motion capture camera is high in cost, ultra-wideband wireless positioning has positioning drift errors and tracking lag, and the installation position of a vehicle recognition sensor cannot adapt to the appearance structure of the racing kart are solved. The device comprises an infrared image pre-imaging processing module, a UWB positioning data pre-processing module and an identification point data fusion module. The kart positioning device, the pose recognition subsystem and the projection interaction system are suitable for kart positioning and interaction between a kart and an immersive projection picture in an ultra-large space.

A connector for use with a wirelessly locatable tag and operable to selectively connect the tag to a battery or an auxiliary source. The connector may selective turn the tag on or off. A method and corresponding system for communicating using a plurality of wirelessly locatable tags by selectively turning the tags on and off.