4039 results about "Beacon" patented technology

A non-access point multi-link device (non-AP MLD) receives from an access point multi-link device (AP MLD), while in a first power save mode, a beacon frame comprising a traffic indication map (TIM) element indicating downlink buffered units (BUs) for the non-AP MLD, where during the first power save mode the non-AP MLD wakes to listen for beacon frames on one of enabled links at least once within a listen interval. After receiving the downlink BUs from the AP MLD, the non-AP MLD switches to a second power save mode, where during the second power save mode the non-AP MLD wakes to listen for beacon frames at each target beacon transmission time (TBTT) on the enabled links until a timer expires.

Disclosed are: a traffic transmission method performed by a first multi-link device (MLD) comprising a plurality of stations respectively operating on a plurality of links in a wireless communication system; and an apparatus. In detail, an MLD of the present invention receives a beacon frame from a second MLD including a plurality of access points (APs) operating on the plurality of links, respectively, and transmits and receives a data unit on the basis of the beacon frame. Here, the beacon frame includes a multi-link traffic indication element indicating mapping between at least one traffic identifier (TID) for a buffered unit (BU) of the plurality of APs from among a plurality of TIDs and the plurality of links, according to whether or not mapping between the plurality of TIDs and the plurality of links is default mapping for downlink or bidirectional.

The invention provides an HPLC (High Performance Liquid Chromatography) station area cooperative communication method based on clock synchronization, which comprises the following steps: step 1, multi-dimensional data acquisition and broadcasting: each concentrator periodically acquires clock precision, stability and reliability data, and sends a beacon frame containing a timestamp and a health degree score through a power line carrier broadcasting channel; step 2, dynamically calculating the index distinction degree by using an entropy weight method, adaptively allocating weights, and electing an optimal main CCO in real time; step 3, dual-mode PID cooperative control: the main CCO adopts a dual-mode switching strategy of a dynamic PID algorithm and a chaotic fractional order PID algorithm; 4, monitoring a synchronization state in real time by constructing a clock check network, and optimizing a fault isolation strategy in combination with weighted scoring to realize that the state switching time of the master node and the slave node is less than or equal to 50ms; cooperative communication is realized on the basis of completing synchronization of the concentrators CCO in the whole network. Redundant message transmission is reduced through a dynamic parameter resynchronization mechanism, and the utilization rate of network resources is optimized.

The invention relates to a laser inter-satellite link test method, system and device and a computer readable medium, which are used for performing butt joint test on a laser inter-satellite link by using a laser inter-satellite link test system. The laser inter-satellite link test system comprises any one of a laser high-speed processor, a first laser terminal, a second laser terminal, a first collimator, a second collimator, a monitoring camera, a micro-vibration simulation galvanometer and a rotary table. The method comprises the following steps: carrying out a signal light capturing and tracking test; carrying out beacon light capturing and tracking and communication distance measurement test; carrying out a beacon light leapfrogging capturing and tracking test; carrying out a broken chain recapture test; performing a long-time link establishment assessment test; therefore, any one of the capture time, the link establishment time, the coherent fine tracking precision, the error rate, the ranging random error, the link reestablishment time, the link establishment interruption times and the recapture success times of the laser inter-satellite link is obtained. According to the invention, the matching performance and reliability of working processes among single machines can be effectively verified, and system risks can be effectively prevented.

The invention relates to the technical field of communication, in particular to an airborne Tiantong phased-array antenna and an application method thereof. According to the method, phased-array antenna beams are driven to perform electronic scanning according to a geometric azimuth angle, beacon signal blind acquisition is performed in a preset airspace in a wide beam mode, and when an initial signal is detected, the mode is immediately switched to a narrow beam scanning mode; dynamically adjusting a phase weighting coefficient to realize pointing adjustment, so that a signal quality parameter is continuously converged in an optimal threshold interval; carrying aircraft maneuvering acceleration feedback is introduced, beam pointing offset is dynamically compensated based on a pre-constructed interference feature library, and signal fluctuation caused by a multipath effect is suppressed; and continuously checking a data validity flag bit of the main inertial navigation system, seamlessly switching to an antenna built-in inertial navigation data stream when a failure threshold is triggered, and activating a rapid recapture program to maintain zero interruption of a communication link. Through dual-source inertial navigation data fusion and intelligent beam control, rapid and accurate tracking of Tiantong satellites in an airborne environment is realized.

In the present invention, a location joint monitoring solution based on the state of a distributed optical fiber and based on an ultra-short baseline is used, and the solution consists of a distributed optical fiber monitoring device, an ultra-short baseline positioning device and a health monitoring host computer. The distributed optical fiber monitoring device consists of a distributed optical fiber cable (300), a distributed optical fiber demodulator (421), etc. The ultra-short baseline positioning device consists of an ultra-short baseline array (200), an underwater beacon (100), a signal processing device (411), etc. The health monitoring host computer (431) can perform signal conditioning, digital signal processing and parameter estimation by means of the signal processing device and the distributed optical fiber demodulator and by using acquired data such as key point locations, deformation and postures, and complete space curve reconstruction of an underwater riser by means of a space curve reconstruction algorithm and an existing finite element analysis software platform, thereby realizing visual outputs of an underwater state of a marine riser.

Systems and techniques are provided for a road intelligence network for improved road safety, traffic management, and / or driver monitoring. The road intelligence network can use monitoring information comprising image data of vehicles on a roadway, or can use monitoring information comprising relative position and distance information for vehicles on the roadway determined using a network of beacon transmitters and receivers. Real-time mapping information indicative of vehicle movement and trajectory can be determined from the monitoring information and correlated to specific vehicles to detect unsafe or undesired driving behaviors, which may be further based on comparisons with historical mapping information of the roadway or for particular vehicles, or baseline driving characteristics of neighboring vehicles. Remediation messages and actions can be transmitted to a mobile application on a user device of a driver, in response to detection of the unsafe driving behavior.

The invention discloses an inter-satellite laser communication load on-orbit receiving and transmitting optical axis coaxial self-calibration device and method, and belongs to the field of inter-satellite laser communication. Comprising a cube-corner prism, a coarse pointing mechanism, a beam expanding group lens, a color separation sheet, a fast reflecting mirror, a communication signal light emitting system, an optical filter, a light splitting sheet, an optical filter, a signal focusing mirror, a communication signal detector, a tracking focusing mirror and a tracking signal detector. Under the condition that beacon light is not used and a laser source is not additionally added, communication signal light is directly adopted to calculate and compensate the offset between the receiving optical axis and the transmitting optical axis through the cube-corner prism, the on-orbit alignment capture time is greatly shortened, and the cost, power consumption, size and weight of a self-calibration device are reduced.

The invention relates to the technical field of broadband spectrums, and discloses a broadband spectrum monitoring system based on dynamic channel allocation, which comprises a data acquisition unit, a data identification unit, a region division unit, a data alignment unit and a channel allocation unit.The system dynamically adjusts the coverage area through beacon nodes, accurately calculates the coverage radius in combination with the urban environment, and improves the coverage efficiency. Meanwhile, a channel allocation strategy is optimized by a game theory, the change of a frequency spectrum environment is responded, and frequency spectrum state parameters are constructed by fusing multi-dimensional characteristics, so that communication smoothness is guaranteed, blind areas of monitoring nodes are eliminated, data space-time alignment is realized, the monitoring sensitivity and the resource utilization rate are effectively improved, and stable frequency spectrum and reliable communication under large-scale activities in cities are ensured; and the dynamic and reasonable distribution of the channels is ensured.

A wireless device may receive a first set of beacon messages from a first set of proximity devices. The wireless device may measure the first set of beacon messages. The wireless device may calculate a first position estimate of the wireless device based on the measured first set of beacon messages and a first set of locations associated with the first set of proximity devices. The wireless device may transmit the first position estimate. The wireless device may receive a second set of beacon messages from a subset of a second set of proximity devices based on the first position estimate. The wireless device may measure the second set of beacon messages. The wireless device may calculate a second position estimate based on the measured second set of beacon messages and a second set of locations associated with the subset of the second set of proximity devices.

This disclosure provides systems, methods, and apparatuses for wireless communication. An example wireless communication device broadcasts a first beacon frame over a first communication link of an access point (AP) multi-link device (MLD) (AP MLD), and broadcasts a second beacon frame over a second communication link of the AP MLD. The first beacon frame indicates transmission of group data over the first communication link, and the second beacon frame indicates transmission of the group data over the second communication link. The wireless communication device transmits the group data, concurrently over the first and second communication links, to one or more wireless stations (STAs). Another example wireless communication device obtains one or more beacon frames indicating buffered group data in an AP MLD for at least the wireless communication device, selects one or more group communication links, and obtains the group data over the one or more selected group communication links.

The invention belongs to the technical field of coupling alignment, and particularly relates to an intelligent auxiliary system for coupling alignment based on dual-laser displacement and an MEMS gyroscope, which adopts a mode of cooperative work of an active stable attitude measurement module and a space reference beacon module to establish a dynamic stable measurement basis which is not influenced by barring operation and environmental disturbance. The micro attitude change of the measuring device can be sensed and actively compensated in real time in the measuring process, it is ensured that laser displacement data at all angles are collected in the same absolute space coordinate system, and the high consistency and accuracy of multi-point measurement data are ensured. And then fusing the attitude feedback signal and the attitude reference signal by using an intelligent resolving module to generate an attitude control instruction, and processing displacement measurement data acquired by a double-laser displacement sensor after the attitude is stable to resolve a centering deviation parameter, thereby being beneficial to improving the efficiency, precision and automation level of coupling alignment work.

The invention provides an unmanned aerial vehicle enhanced positioning method and system fusing GNSS and UWB, and the method comprises the steps: receiving a flight task instruction from a ground station, starting a GNSS module through the flight task instruction, obtaining an initial position, and building a communication connection with a plurality of fixed beacon nodes through a UWB module; adjusting the position estimation of the unmanned aerial vehicle according to the initial position and the real-time distance measurement information in combination with wide-area positioning data to obtain accurate position estimation, and when the unmanned aerial vehicle enters a signal blocking area, switching to UWB to carry out accurate positioning processing on the unmanned aerial vehicle and generating a fusion positioning result; updating the positioning strategy in case of emergency in the process of executing the specific task to obtain a positioning scheme; all GNSS and UWB positioning data acquired during the flight period are integrated, analyzed and processed to generate a flight path report, and the flight path report is uploaded to a cloud server; according to the technical scheme provided by the invention, the positioning precision and service reliability of the unmanned aerial vehicle in different environments are improved, and smooth completion of tasks is ensured.

The invention discloses a power line carrier communication protocol data link layer simulation method, which comprises the following steps of: constructing a physical layer interface simulation module, simulating power line carrier or wireless air interface transmission through TCP socket communication, and creating a high-priority task process to process time slot-level time sequence synchronization for triggering a physical layer transceiving action at a specified time slot; configuring a time sequence synchronization control mechanism, obtaining a timestamp carried by a beacon frame sent by a concentrator, calling a clock synchronization function to align a site local clock with the timestamp when receiving the head of the beacon frame, adding delay compensation before sending data, and delaying and starting a physical layer receiving action to offset IP network transmission delay when receiving the data; a data frame processing flow is realized, a header callback function is controlled through a registration frame to respond to a physical layer state change, TCP message data is cached by using an annular queue, and a physical layer interface simulation module analyzes a message, distributes a memory and processes a load at a specified time slot after time sequence synchronization.

Techniques for beacon and threat intelligence based Advanced Persistent Threat (APT) detection are disclosed. In some embodiments, a system / process / computer program product for beacon and threat intelligence based APT detection includes collecting firewall log data from monitored network traffic; analyzing the firewall log data at a cloud security service to identify beacon traffic based on a plurality of heuristics; performing a risk evaluation of the beacon traffic to detect malicious beacon traffic; and performing an action in response to detecting the malicious beacon traffic.

A method of operating a plurality of communications nodes in a 10BASE-T1S Ethernet network. The plurality of communications nodes are configured to implement a physical layer collision avoidance, PLCA, process. At least two of the communications nodes are candidate beacon generators. The method comprises: for each of the at least two candidate beacon generators, determining a time delay since a last received beacon, comparing the determined time delay with a threshold value associated with the candidate beacon generator, and if the time delay exceeds the threshold value then setting that candidate beacon generator as an in-use beacon generator; and the in-use beacon generator transmitting a beacon to define the start of a PLCA cycle, thereby triggering a transmit opportunity for each of the other communication nodes.

A method includes providing a radar sensor onboard a vehicle, and one or more active radar beacons around a landing site. Each beacon produces a pattern of one or more artificial echoes that is different from a pattern of echoes produced by others of the beacons. The method further includes guiding the vehicle toward the landing site by transmitting radar signals from the radar sensor to an area around the landing site; receiving return signals from the area around the landing site, including ground reflected signals and transmitted signals from each beacon; and determining whether artificial echoes are detected in the received return signals. When artificial echoes are detected, beacon parameters are loaded from an onboard active beacons database; patterns in the artificial echoes are identified and associated with corresponding beacons from the database; and a slant range to each of the beacons is estimated through the patterns.

The embodiment of the invention provides an aircraft motion state determination method based on Lie group unscented Kalman filtering, and the method comprises the steps: building a state model of a target aircraft, and a measurement model of the target aircraft; obtaining a final Lie group state estimation value of the target aircraft through iterative calculation according to the state model and the measurement model; and determining the motion state of the target aircraft according to the final Lie group state estimation value. According to the technical scheme, a Lie group unscented Kalman filtering navigation framework based on external measurement information is provided, specific forms of sigma point error propagation on Lie algebra and state updating on the Lie group are given, and a self-adaptive updating method of a state noise covariance matrix and a measurement noise covariance matrix is designed. Therefore, the self-adaptive Lie group unscented Kalman filtering method is provided, and the multi-sensor multi-beacon target state estimation precision is greatly improved by means of the self-adaptive Lie group unscented Kalman filtering method.

The invention provides a transformer substation unmanned aerial vehicle three-dimensional route real-time planning and autonomous obstacle avoidance system, and relates to the technical field of non-electrical variable control or adjustment systems. Through cooperative work of a navigation mode switching module and a near-field navigation control module, an electric field of equipment is used as a natural navigation beacon; and high-precision autonomous flight is realized in a strong electromagnetic interference area with RTK signal failure, and the dependence on external positioning is eliminated, so that the inspection blind area is eliminated. Meanwhile, a fusion environment map containing multi-physics field information is constructed, the value of observation points is scientifically quantified according to waypoint inspection efficiency indexes, and a path planning algorithm aims at optimizing a comprehensive target fusing energy consumption, risks and inspection efficiency. The design not only ensures that the unmanned aerial vehicle can safely get close to the core equipment, but also enables the planned route to be the most valuable path rather than the shortest path, and finally fundamentally improves the safety, the operation efficiency and the data validity of substation inspection.

The invention belongs to the technical field of underwater positioning, and discloses an underwater single beacon semi-definite programming positioning method and system under a linear sound profile condition. According to the method, based on a semi-definite relaxation technology, a positioning problem in a semi-definite programming form is obtained, the semi-definite programming problem is solved through an interior point method, and an initial position solution of single beacon positioning is obtained; and the estimation error of the initial position solution is explicitly expressed, a linear estimation formula of the estimation error is constructed in combination with a virtual long baseline positioning equation, and the estimation error is solved based on weighted least squares, so that the initial position solution is corrected, and a more accurate AUV position estimation solution is obtained. Compared with other single beacon positioning methods which do not consider sound propagation refraction, the method of the invention can obtain a more accurate position calculation result under a linear sound profile condition, and enhances single beacon positioning, especially the practical application capability of the method in deep sea areas.

A method includes sending, by a master beacon device and one or more beacon repeater devices, ultra-wideband (UWB) beacon frames. The UWB beacon frames are transmitted as interleaved pairs of UWB beacon frames. Each interleaved pair includes a first UWB beacon frame and a second UWB beacon frame. For each interleaved pair, the first UWB beacon frame and the second UWB beacon frame are transmitted with a master time delay. The method further includes receiving, by one or more tag devices, at least one of the interleaved pairs of UWB beacon frames.

A channel selecting method includes configuring a main access point to provide a first coverage area in a wireless communication network and performing a channel scanning on a plurality of communication channels to obtain a first area information; assigning an initial preference score to each of the communication channels and adjusting the initial preference score to a first preference score according to the first area information; transmitting a beacon request message to a communication device located in the first coverage area and having a second coverage area; controlling the communication device to perform another channel scanning on the communication channels to obtain a second area information; adjusting the first preference score of each of the communication channels to a second preference score according to the second area information; selecting the communication channel corresponding to the second preference score with a maximum value as a target channel.

The invention relates to the technical field of submarine cable fault positioning, in particular to a submarine cable fault positioning system based on underwater beacons. The method comprises the steps that an underwater acoustic beacon array unit monitors and collects submarine cable fault sound wave signals in real time based on underwater acoustic beacons; the fault signal processing analysis unit extracts submarine cable fault sound wave signal parameters based on a non-point source space sound source waveform analysis model, and generates multi-parameter fault sound source feature vectors; the sound source positioning analysis algorithm unit performs three-dimensional inversion positioning based on the multi-parameter fault sound source feature vector and the arrival time difference of the submarine cable fault sound wave signal to the underwater acoustic beacon, and obtains the spatial position information of the submarine cable fault point; and the data communication alarm management unit sends the spatial position information of the submarine cable fault point to a shore-based operation and maintenance system. The submarine cable fault positioning method is used for realizing a submarine cable fault positioning technology for quickly and accurately positioning and identifying spatial extension characteristics in a complex submarine environment.

The invention relates to the technical field of wireless communication, and discloses a communication equipment command and dispatch system based on artificial intelligence, the system maps the state of communication equipment into a standardized carrier phase disturbance mode, and after the disturbance mode is adaptively adjusted in combination with channel noise perception and conflict arbitration logic, the communication equipment is commanded and dispatched. Controlling the radio frequency front end to carry out injection; the adjacent communication equipment directly detects the disturbance mode to trigger the cooperative scheduling action by monitoring the physical error signal of the carrier synchronization loop of the adjacent communication equipment, and the implicit cooperative mode based on the physical layer beacon is constructed, so that the complex high-level signaling interaction required by the traditional scheduling is avoided, and the scheduling efficiency is improved. According to the method, the millisecond level, determined by a software protocol, of the collaborative response time between the devices is substituted into the microsecond level determined by the hardware physical layer response entscheid, the system can still maintain reliable transmission of scheduling instructions when facing high-density concurrent conflicts and strong channel noise, and a technical implementation path is provided for ultra-low-delay and high-reliability communication.

The invention belongs to the technical field of underwater positioning, and discloses an underwater single-beacon Gaussian Newton positioning method and system under a linear sound profile condition. According to the method, underwater acoustic signal propagation time observation noise is modeled into Gaussian distribution, a maximum likelihood estimation problem is constructed, and then the maximum likelihood estimation problem is converted into a nonlinear least square estimation problem; and solving the gradient of the observed quantity to the position coordinates of the AUV based on a chain rule, iteratively solving a nonlinear least square estimation problem based on a Gauss-Newton method, and obtaining the position coordinates of the AUV after iterative convergence. Compared with other single beacon positioning methods which do not consider sound propagation refraction, the method of the invention can obtain a more accurate position calculation result under a linear sound profile condition, and enhances single beacon positioning, especially the practical application capability of the method in deep sea areas.

The invention belongs to the technical field of underwater positioning, and discloses an underwater single beacon virtual long baseline positioning method and system capable of estimating an unknown sound velocity. The method comprises the following steps: constructing a virtual long baseline array by combining stored dead reckoning data; constructing a virtual long baseline positioning problem by combining the relationship between the underwater acoustic signal propagation time and the position and sound velocity of the AUV; auxiliary variables are introduced, a pseudo-linear positioning equation is obtained based on algebraic conversion, and an AUV position initial solution is obtained based on a weighted least square method; and constructing a second-step linear estimation problem by exploring the relationship between the auxiliary variable and the AUV position, and solving by using weighted least squares to obtain a more accurate AUV position estimation solution. Compared with a single-beacon positioning method which does not consider sound velocity unknown, the method provided by the invention can obtain more ideal position estimation performance, and the practical application capability of an underwater single-beacon positioning system is enhanced.

The invention discloses a high-precision real-time positioning system and method for positioning personnel based on multi-mode fusion. The system comprises a multi-source data acquisition module, an intelligent data processing module, a fusion positioning model construction module and a positioning result application module, provides visual monitoring, trajectory analysis and scene customization functions, and supports flexible expansion through modular design. According to the method, satellite positioning, Bluetooth beacon and inertial navigation technologies are integrated, the weight is dynamically adjusted in combination with an adaptive weighted fusion algorithm, and a fusion positioning model supports outdoor (satellite dominant + EKF calibration, the precision being 2-5 meters) and indoor (beacon dominant + fingerprint matching, the precision being lt); according to the invention, intelligent switching between three modes (inertial navigation + ZUPT correction) and signal loss (1 meter) is realized, data noise is optimized by using Kalman filtering, and high-precision real-time positioning in indoor and outdoor complex scenes is realized. According to the invention, the problems of insufficient precision, poor environmental adaptability and weak expansibility of a single positioning technology are solved, and the comprehensive performance of the positioning system is significantly improved.

Embodiments are directed to monitoring network traffic using network monitoring computers (NMCs). Metrics may be determined based on monitoring network traffic associated with a plurality of entities each associated with a profile that includes the metrics for each entity. Beaconing metrics associated with beaconing activity may be determined based on the metrics. The profile of each entity may be compared with the beaconing metrics to determine the entities that may be engaged in beaconing activity. The entities may be characterized based on beaconing activity such that the beaconing activity includes communication with endpoints associated with the third parties, employing communication protocols associated with the third-parties, or exchanging payloads consistent with the beaconing activity. Reports that include information associated with the entities and its beaconing activity may be generated.

The invention provides an anti-interference sound signal data extraction method based on energy data perception, and belongs to the technical field of underwater sound signal processing, and the method comprises the steps: carrying out the A / D sampling and digital orthogonal demodulation of a received sound signal, and obtaining a baseband signal; performing low-pass filtering and downsampling on the baseband signal to obtain a preprocessed signal; performing matched filtering on the pre-processed signal by using a reference signal; the key improvement lies in that a local energy estimation function of a preprocessed signal is calculated, and normalization processing is carried out on a matched filtering result and the energy estimation function to obtain a normalized detection signal. The method effectively suppresses the shielding effect of a strong interference signal on a weak target signal under a non-orthogonal reference signal and a strong near-end and weak far-end scene, remarkably reduces the misrecognition probability, and improves the accuracy and reliability of the extraction of a long-distance and low-signal-to-noise-ratio target beacon signal in a complex underwater acoustic environment. The method is suitable for underwater navigation, positioning and communication systems.

The invention discloses a wireless optical communication alignment system and a capture alignment method thereof, and relates to the technical field of optical communication, and the method comprises the steps: a three-dimensional holder carries out the coarse alignment of an optical path between a transmitting end and a receiving end according to the direction of beacon light; an alignment device located at the top of the three-dimensional holder carries out fine alignment on the light path; the alignment device comprises a two-dimensional alignment structure, a control circuit and a device shell. The control circuit captures a light intensity feedback value of the light intensity sensor of the two-dimensional alignment structure, and adjusts an azimuth angle and a pitch angle of the optical fiber collimator of the two-dimensional alignment structure according to the light intensity feedback value so as to adjust lens orientations of the transmitting end and the receiving end; the device shell provides a supporting platform for the two-dimensional alignment structure and the control circuit and is connected with the three-dimensional holder. Coarse alignment and fine alignment are combined, accurate angle adjustment is achieved through light intensity feedback, efficient alignment of light paths of the transmitting end and the receiving end is ensured, meanwhile, the device shell provides stable support and connection, and the stability and reliability of the alignment process are guaranteed.