15 results about "Trilateration" patented technology

The invention relates to the technical field of archive management, and discloses an RFID archive management positioning device which comprises a frame body, a layer plate, a controller, an electronic door lock, a touch operation screen, an RF read-write module, an ultrahigh frequency RF antenna, a position indicator light belt, universal wheels, a camera, a glass door and a sensing assembly. Wherein the shelf board is located in the rack body and used for placing file bags or file boxes, the ultrahigh frequency RF antennas are distributed at the positions perpendicular to the shelf board and parallel to the glass door, the position indicator light belt is installed on the shelf board, and the touch operation screen is installed on the glass door. According to the invention, accurate positioning in a high-density scene is realized through cross-type ultrahigh-frequency antenna layout and an optimized positioning algorithm, the algorithm eliminates environmental interference through RSSI signal strength normalization processing, reduces response time delay error through a multipoint sampling average value method, and combines a trilateration principle with multiple groups of antenna data, so that the positioning accuracy is improved. And the positioning error can be controlled within the range of + / -1 file.

This invention discloses a child positioning system and method for preventing children from getting lost in scenic areas based on ultra-wideband (UWB) technology, belonging to the field of child safety monitoring technology. The system includes: multiple UWB positioning base stations with known three-dimensional coordinates, a UWB positioning tag worn by the child, and a positioning calculation unit. The method first involves the tag performing bidirectional ranging with at least three base stations to obtain the signal flight time; then, the positioning calculation unit calculates the straight-line distance between the tag and each base station; finally, a trilateration algorithm is applied to calculate the spatial coordinates of the tag based on the distance values ​​and base station coordinates. Preferably, this invention also incorporates motion state perception for intelligent energy saving, combines wearing status monitoring for anti-drop alarm, and can be linked with video surveillance for collaborative tracking. This system and method solve the problems of low accuracy and poor reliability of traditional positioning technologies, achieving high-precision, high-reliability, and low-power child positioning monitoring.

The position of a mobile device relative to a vehicle is determined. Time-of-flight (TOF) messages exchanged between ultra-wideband (UWB) anchors and a mobile device are detected via the vehicle's UWB anchors. In response to a lack of TOF message reception from a number of UWB anchors required to perform trilateration for at least a large number of consecutive ranging rounds, the vehicle activates a radar mode to detect angle-of-arrival and distance information between the UWB anchors and the mobile device. Upon activation of the radar mode, the vehicle receives channel impulse response (CIR) data from the UWB anchors. The mobile device's position is determined based on the CIR data and the TOF messages. This mobile device position is then used for one or more vehicle applications.

The application provides a kind of electronic fence design method and device for construction safety control under near electric environment, comprising: through the ranging communication of mutually executed UWB base station that has been deployed and the generation of calibration parameters combined with preset calibration point, coordinate calibration is completed;Base station and personnel positioning tag bidirectional ranging obtain round-trip time delay raw data;Round-trip time delay raw data is protocol analyzed, median filtered and discarded based on statistical threshold exception data, to obtain pure ranging data set;Pure ranging data set is input into positioning engine, and real-time coordinates are obtained by trilateration and least square solution;Space relationship calculation is carried out with preset electronic fence model, and the final real-time position state and risk level are generated through buffer and hysteresis mechanism and risk judgment logic based on uncertainty;Trigger corresponding alarm and push management platform.In this way, the coordinate precision of positioning engine solution is improved, and millisecond-level accurate identification and hierarchical active warning of construction personnel approaching dangerous area are realized.

The application discloses a kind of query confusion location protection methods based on auxiliary area, including the following steps: according to the real location of user randomly generates three auxiliary positions;According to user demand parameter and auxiliary position generates corresponding three auxiliary areas;The generation of confusion query content;According to auxiliary position, auxiliary area, real query content and confusion query content generate query message result set, and the coordinate of each point of interest in query result is calculated in combination with trilateration method, and finally the distance between the real location of user and each point of interest is obtained.The beneficial effects of the application are as follows: auxiliary area mechanism makes the attacker unable to obtain the accurate location of user, while the coordinate of point of interest is calculated locally in combination with trilateration method, which ensures the accuracy of LSS service;Confusion query mechanism makes the attacker unable to accurately predict the next location of user through query result set, which protects the query privacy of user.

The application relates to the technical field of file management, and discloses an RFID file management positioning device which comprises a frame body, a layer plate, a controller, an electronic door lock, a touch operation screen, an RF read-write module, an ultra-high frequency RF antenna, a position indicating lamp strip, a universal wheel, a camera, a glass door and a sensing assembly; the layer plate is arranged in the frame body and used for placing file bags or file boxes; the ultra-high frequency RF antenna is arranged at a position perpendicular to the layer plate and parallel to the glass door; the position indicating lamp strip is arranged on the layer plate; and the touch operation screen is arranged on the glass door. The application realizes accurate positioning in a high-density scene through a cross-type ultra-high frequency antenna layout and an optimized positioning algorithm; the algorithm eliminates environmental interference through RSSI signal strength normalization processing, reduces response time delay error through a multi-point sampling average value method, and combines the principle of trilateration with multi-group antenna data, so that the positioning error can be controlled within a range of 1 file.

A configuration wherein multiple radars arc positioned along the flight corridor of a test object or objects. At any given time, three radars are used to accurately measure the location of each object via trilateration.

The present disclosure provides "non-line-of-sight object detection". A position of the mobile device relative to the vehicle is determined. A time of flight (TOF) message exchanged between an ultra wide band (UWB) anchor point and a mobile device is detected via the UWB anchor point of a vehicle. In response to not receiving TOF messages from a number of the UWB anchor points necessary to perform trilateration measurements for at least a plurality of consecutive ranging rounds, the vehicle initiates a radar mode to detect angle of arrival and distance information between the UWB anchor points and the mobile device. In response to turning on a radar mode, the vehicle receives channel impulse response (CIR) data from the UWB anchor. A location of the mobile device is determined based on the CIR data and the TOF message. The location of the mobile device is used for one or more vehicle applications.

The invention discloses a high-precision positioning system based on a UWB technology, and relates to the field of industrial positioning, the high-precision positioning system comprises a three-dimensional positioning module, an attitude sensing module and a safety detection module, high-precision personnel positioning and safety monitoring are realized through multi-module cooperation, the three-dimensional positioning module utilizes more than four base stations, and the attitude sensing module is used for sensing the attitude of the three-dimensional positioning module. Obtaining a smooth three-dimensional coordinate by combining trilateration, a least square method and a filtering algorithm; the attitude sensing module adopts a two-channel analysis strategy, performs adaptive switching according to environmental complexity and outputs synchronous space-time attitude data, and the safety detection module realizes high-reliability fall detection and severity judgment through three-layer analysis of threshold rules, multi-mode matching and machine learning, so that false alarms are effectively reduced, and the safety and reliability of fall detection are improved. The method is suitable for accurate positioning and emergency response in a complex indoor scene, deeply meets the complex environment requirements of industrial factories, and realizes all-around guarantee from accurate positioning to safety monitoring through multi-module cooperation and intelligent decision making.

A position estimation method is performed by a position estimation apparatus, wherein the position estimation method includes switching from a UWB static domain to a UWB dynamic domain when a startup state of a vehicle is switched from OFF to ON; operating one or more anchors mounted on the vehicle; and estimating a position of a tag by performing at least one of an advanced trilateration measurement (ATM) algorithm and a smart anchor positioning (SAP) algorithm, wherein the one or more anchors and the tag transmit and receive ultra wideband (UWB) pulse waves.

This invention relates to a localization and range unambiguity method based on prior constraints and multi-station collaboration. Under a single-transmitter, multiple-receiver radar system, this method can achieve range unambiguity based on prior target information and simultaneously perform high-precision localization using trilateration. The method first obtains the range-Doppler echo data matrices from different receiving stations. Preliminary processing of the echo data is performed using a low threshold. In the spatial domain, the idea of ​​a one-dimensional set algorithm is used to unambiguously determine the target under prior constraints. Simultaneously, high-precision target localization is achieved using the trilateration algorithm. The positions of all potential targets within the echo data are iteratively processed to complete high-precision localization and range unambiguity determination for all targets. This method exhibits high stability, can detect and locate multiple targets, and has promising engineering application prospects.

The invention provides a low-altitude aircraft cooperative positioning method based on a Bluetooth ad hoc network, and the method comprises the steps: enabling low-altitude aircraft nodes to find neighbors through Bluetooth broadcasting and scanning, and constructing the ad hoc network; carrying out Bluetooth RSSI distance measurement on all nodes in the network and neighbor nodes, smoothing RSSI through Kalman filtering, converting the RSSI into distance by using an online calibrated path loss model, and recording a result; selecting three aircraft nodes which meet a triangular inequality and are neighbor to one another, and establishing a global coordinate system by taking the aircraft nodes as initial anchor nodes; selecting three anchor nodes adjacent to the non-anchor node, performing trilateral positioning by using the distance measurement results of the three anchor nodes and the node to be positioned, calculating the coordinates of the three anchor nodes, and upgrading the three anchor nodes into the anchor nodes; and iteratively executing the steps until all nodes in the network are positioned. According to the invention, the low-cost and low-power-consumption Bluetooth module is utilized, the distributed and high-robustness cooperative positioning of the aircraft cluster is realized through an innovative signal processing and modeling method in an environment without GPS signals, the support of a ground base station is not needed, and the method is suitable for emergency investigation, cluster performance and other scenes.

This position estimating device (3) is configured so as to comprise: a distance measurement unit (11) that, on the basis of electromagnetic waves transmitted and received between a plurality of wireless devices (1-1 to 1-5) installed in a vehicle and a terminal (2) carried by a user, measures the distance between a wireless device (1-n (n=1, ..., 5)) and the terminal (2); a distance selection unit (12) that selects a distance that can be used for trilateration of the position of the terminal (2) on the basis of a plurality of distances measured by the distance measurement unit (11); and a position estimating unit (13) that estimates the position of the terminal (2) using the distance selected by the distance selection unit (12).

A position of a mobile device relative to a vehicle is determined. Time-of-flight (TOF) messages exchanged between ultra-wideband (UWB) anchors and a mobile device are detected via UWB anchors of a vehicle. Responsive to a lack of receipt of TOF messages from a quantity of the UWB anchors necessary for performing trilateration for at least a plurality of consecutive ranging rounds, the vehicle switches on a radar mode to detect angle of arrival and distance information between the UWB anchors and the mobile device. Responsive to switching on a radar mode, the vehicles receive channel impulse response (CIR) data from the UWB anchors. A position of the mobile device is determined based on the CIR data and the TOF messages. The position of the mobile device it utilized for one or more vehicle application.

The application discloses a kind of optimal UWB base station selection method based on multi-factor criterion, belong to wireless positioning and navigation technical field.The application constructs multi-factor characteristics in sliding time window to candidate base station / base station combination: including ranging error characteristics, abnormal point characteristics and geometric dilution of precision characteristics;After each feature is normalized, the integrated evaluation target function is obtained by weight fusion, and under the constraint of meeting the volume threshold of four base station tetrahedron, the optimal four base station combination with the minimum target function is obtained from the combination of N base stations;Subsequently, based on the ranging data of the selected base station, the position solution is completed by trilateration combined with weighted least squares / Huber robust estimation.The application can adaptively eliminate high error, high abnormal or configuration deterioration base station combination, reduce positioning error amplification effect, improve the precision and robustness of UWB positioning, suitable for unmanned vehicle, mobile robot and personnel positioning scene.