584 results about "Propagation delay" patented technology

The invention discloses an intelligent water affair monitoring management method and system based on the Internet of Things, particularly relates to the technical field of water affair management, and is used for solving the problems of control instruction mismatching, redundant execution and equipment overload caused by the fact that a static topology model cannot sense the dynamic change of a pipe network in real time in the prior art. Through real-time collection of pipe network operation data and analysis of time-space correlation characteristics of water flow propagation delay parameters and pressure mutation, a pipe network topology change event is dynamically perceived; the flow direction sudden change reasonability is verified in combination with fluid mechanics conservation constraint, and a corrected topological mapping table is generated through reverse calculation; candidate paths are screened based on water flow inertial parameters and pressure gradient threshold values, a safety control instruction set is generated through a multi-stage verification rule, dynamic matching of a pipe network regulation and control instruction and a real topological structure is achieved, the matching degree of the control instruction and the physical state of a pipe network is effectively improved, the leakage risk and energy waste are reduced, the manual maintenance requirement is reduced, and the safety of the pipe network is improved. The service life of equipment is prolonged.

The invention relates to the technical field of power system communication, and discloses a fault diagnosis method and system for a substation communication network, and the method comprises the steps: obtaining multi-band signal data, and carrying out the fast Fourier transform to obtain spectrum distribution data; according to the spectrum distribution data, performing frequency band division to obtain an initial power ratio; performing adaptive filtering according to the initial power ratio and the multi-band signal data to obtain a fundamental wave amplitude fluctuation characteristic; performing wavelet decomposition according to the fundamental wave amplitude fluctuation characteristics to obtain abnormal signal time-frequency energy distribution; performing K-means clustering division according to the abnormal signal time-frequency energy distribution, and matching a harmonic fault database to obtain a fault type identifier; and according to the fault type identifier and the abnormal signal time-frequency energy distribution, ring network topology propagation time delay analysis is carried out, a fault position coordinate is positioned, and a fault diagnosis report is generated. According to the method, the network fault can be accurately diagnosed for multi-band complex signal interference.

The invention discloses a time synchronization method suitable for a satellite communication system, and the method comprises the steps: analyzing a forward broadcast signal, and obtaining the reference time of a network clock; constructing a geometric prediction handle based on satellite orbit data, and predicting one-way propagation time delay between a terminal and a satellite by using the geometric prediction handle; estimating the processing delay of the terminal according to the symbol rate and the equipment working condition of the terminal and the delay calibration data; fusing the network clock reference time with the processing delay estimate to synthesize a terminal local time; and the sending time of the return link is calculated based on the local time and the propagation delay prediction. According to the method, the synchronization precision can be improved to a microsecond level, the convergence speed in a dynamic scene is accelerated, adaptive compression of the guard interval is supported, and the stability and spectrum efficiency of a satellite communication system are effectively improved.

The present disclosure relates to data block retransmission in wireless communications, and particularly in wireless communications having a relatively large propagation delay. Some embodiments relate to memory management and may involve a maximum time period during which a data block that is to be communicated in a wireless communication network may remain in memory space at a user equipment (UE) to support a data block retransmission procedure. UE reporting of current occupancy status of the memory space is also or instead supported in some embodiments. Selective transmission or retransmission may be provided, and may involve reception occasions at which a UE may receive a data block retransmission or a transmission of a different data block.

Various solutions for physical random access channel (PRACH) timing advance operation and PRACH configurations with respect to user equipment and network apparatus are described. An apparatus may determine a propagation delay between the apparatus and a network node. The apparatus may determine a pre-compensation timing margin. The apparatus may perform a timing advance pre-compensation according to the propagation delay and the pre-compensation timing margin. The apparatus may transmit an uplink signal by applying the timing advance pre-compensation.

The invention discloses a BIM (Building Information Modeling)-based large-span post-tensioned bonded prestressed beam construction method. The BIM-based large-span post-tensioned bonded prestressed beam construction method comprises the following steps: collecting a vibration signal of a working rib and a matt rib reference signal of a matt rib; inputting the dummy rib reference signal into an adaptive filtering algorithm to which phase preserving constraint is applied, and performing noise cancellation processing on the working rib vibration signal to generate a purified pressure wave signal; performing multi-scale decomposition on the purified signal, extracting propagation time delay of the direct wave based on coherence analysis among components, and generating a phase-time delay characteristic matrix; and based on pre-configured geometric parameters of the BIM three-dimensional model, a real-time stress distribution field is calculated through inversion according to the phase-time delay characteristic matrix, and the real-time stress distribution field is synchronously updated to the BIM three-dimensional model. According to the method, the phase distortion problem under noise interference is solved through a physical reference channel and phase preserving filtering, the accuracy of time delay extraction is improved through a multi-path separation technology, and high-precision and high-robustness real-time monitoring of the prestress is achieved.

The invention belongs to the technical field of power system measurement, and relates to a three-phase power parameter wireless synchronous measurement and vector analysis method and system, and the method comprises the following steps: generating and broadcasting a synchronous pulse code containing triggering phase information; generating a predicted phase angle; obtaining a comprehensive phase deviation value; performing dynamic feature separation processing on the comprehensive phase deviation value to generate a slowly-varying propagation delay feature and a transient prediction error feature; injecting the prediction error characteristics into a local phase predictor for calibration; acquiring phase voltage / current data based on the compensated sampling time, and calculating a fundamental wave effective value and a phase angle relative to a local calibration time reference; and packaging the fundamental wave effective value, the phase angle and the local timestamp into a simplified data packet and transmitting the simplified data packet to an analysis terminal. According to the method, the problems that in a traditional mode, satellite time service rejects signals in a substation indoor or underground scene, and synchronization interruption is easily caused by electromagnetic interference are solved.

The invention provides a remote monitoring method and system applied to children's watches, and relates to the technical field of children's watches, time axis synchronous alignment is carried out on collected multi-source heterogeneous data through an interpolation method, data time sequence chaos caused by sampling rate differences is prevented, and then the data time sequence chaos caused by sampling rate differences is prevented. Through dynamic coupling calculation of a light intensity mutation gradient and a heart rate stress coefficient, the cooperative influence of environment change on the physiological state of the child is quantified in real time, and the physiological state of the child is determined by further combining power spectrum centroid frequency and physiological phase difference analysis of the motion rhythm and logarithmic correlation of acoustic envelope frequency and GPS speed. In addition, an acoustic propagation delay compensation mechanism is introduced, a two-factor dynamic equation model is constructed through a time delay cross term, and a dynamic risk threshold generation mechanism based on a noise energy ratio is combined, so that the dynamic risk threshold of the motion intensity, the rhythm characteristics and the acoustic scene is effectively distinguished. Effective remote monitoring on child safety in different scenes is realized.

Embodiments include methods for a user equipment (UE) to synchronize timing with a wireless network. Such methods include receiving, from a first node serving a first cell in the wireless network, a first message that includes an absolute reference time and a corresponding reference event within downlink, DL, transmissions by the first node; and determining whether the UE received, from the first node, a timing adjustment value from which the UE can estimate a propagation delay of the DL transmissions. Such methods include, based on determining that the UE did not receive the timing adjustment value, performing one of the following: transmitting, to the first node, an indication that the UE did not receive the timing adjustment value; or declaring radio link failure with respect to the first cell and establishing a connection with a second cell capable of providing the information included in the first message.

The invention relates to a dynamic routing method for an underwater acoustic communication network, and the method comprises the steps: each node obtains the three-dimensional coordinates of the node in real time through a positioning module, and periodically broadcasts an enhanced neighbor discovery control packet comprising the node position, the node residual energy and the available bandwidth; the physical layer of each node determines a signal-to-noise ratio, a propagation delay and a packet loss rate according to the received enhanced neighbor discovery control packet, and updates a link state table through a shared memory; the network layer of each node reads the link state, position information and node residual energy of a neighbor node from the link state table of the shared memory, and constructs a neighbor table; when the source node sends underwater acoustic communication data to the destination node based on the neighbor table and there is no available route, route discovery is triggered to obtain a target route path; and sending the underwater acoustic communication data based on the target routing path.

The invention relates to the technical field of disaster monitoring. According to the emergency state alarm system, clock calibration processing is carried out on all sensor nodes through a synchronous clock protocol, and a calibrated unified reference clock source is generated; collecting and processing multi-source data of a target scene, and generating a sensor data stream with a timestamp and an environment interference parameter set; constructing a medium propagation delay prediction model according to the environment interference parameter set and the physical characteristic parameters of the sensor; performing dynamic compensation processing on the sensor data stream to generate a time-aligned multi-sensor data set; and performing multi-modal fusion analysis on the time-aligned multi-sensor data set, and triggering a graded alarm signal to solve the problem of insufficient dynamic coupling modeling of sensor degradation and environment interference in a multi-modal conflict resolution mechanism and the problem of insufficient spatial-temporal characteristic driving caused by the fact that cross-sensor decision depends on static weight. Accurate identification and grading alarm optimization of abnormal events are realized.

The invention provides an intelligent space sensing dynamic topology optimization method and system based on electromagnetic detection, and the method comprises the steps: firstly obtaining an electromagnetic detection data set composed of electromagnetic signal intensity and propagation delay information of different position nodes in an intelligent space, and then carrying out the sensing equipment state analysis of the electromagnetic detection data set; the method comprises the steps of obtaining a state feature set containing equipment connection stability and signal coverage range features, generating a dynamic topology optimization strategy containing an equipment connection relation adjustment rule and a signal coverage area distribution scheme according to the state feature set, and adjusting a sensor network topology structure according to the dynamic topology optimization strategy. And finally, performing optimization effect evaluation on the adjusted sensor network topological structure, and feeding back an evaluation result to trigger strategy updating, thereby dynamically optimizing the sensor network topological structure and improving the stability and reliability of the intelligent space sensor network.

Dynamic slicing technology can be performed to assign network resources for various robotic repairing subtasks having different priorities, while satisfying various real-time and high throughput requirements. In some cases, M / M / 1 queuing theory is applied so as to efficiently improve the utilization of network resources, reduce queuing latency and propagation latency, and balance the load among different network slicing, so as to perform robotic repairing operations.

The invention discloses a multi-index dynamic fusion traffic hidden danger identification and completion method and system, and relates to the technical field of intelligent traffic systems, and the method comprises the steps: obtaining a multi-dimensional traffic data sequence containing missing values in a target monitoring region, the multi-dimensional traffic data sequence comprises a traffic flow index sequence, a driving behavior characteristic sequence and a road environment parameter sequence; and interpolating missing values in the multi-dimensional traffic data sequence based on a spatio-temporal dynamic graph completion network to generate a completed spatio-temporal data tensor. According to the method, the missing data are accurately completed through a space-time dynamic graph completion network, a space graph convolution layer of road network topology, a gating circulation unit of a modeling time sequence rule and a cross-index attention module, multi-index dynamic association is fully fused, and propagation delay and a space-time evolution rule are considered; and deep fusion features are extracted by using a shared feature encoder, hidden danger identification branches are linked, traffic flow, driving behaviors and environmental parameters are dynamically fused, and hidden danger dynamic formation paths are captured.

The invention discloses an expressway congestion situation prediction method. The method comprises the following steps: step 1, data acquisition and preprocessing: traffic state data is acquired in real time through monitoring equipment installed at key traffic nodes of an expressway; step 2, space-time joint data embedding: fusing node space topology, time features and position codes to form multi-dimensional input; step 3, heterogeneous space-time self-attention coding: fusing three types of attention of remote collaboration, local window and dynamic time sequence dependence, and uniformly modeling space conduction, global association and historical evolution characteristics among highway nodes; step 4, heterogeneous multi-head attention aggregation: integrating three types of heterogeneous attention outputs, and mapping the three types of heterogeneous attention outputs to the same embedding space; and 5, traffic jam situation prediction: setting a regression branch and a classification branch. The method aims at overcoming the defects in the aspects of propagation delay modeling and remote semantic association expression in the prior art.

The invention relates to the technical field of communication, and discloses an access point, terminal equipment and a short-distance communication time synchronization method and system.The access point equipment and the terminal equipment each comprise a baseband signal processing unit, a radio frequency unit, an antenna, a global time counter and a clock compensation module. The time synchronization method is executed by a target terminal: receiving a beacon frame broadcasted and sent by an access point; calibration information is embedded in the beacon frame, and the calibration information comprises timestamp information and a transmitting power parameter; calculating actual propagation delay of the access point and the target terminal based on the timestamp information; calculating target propagation delay of the access point and the target terminal based on the transmitting power parameter; calculating a delay error between the actual propagation delay and the target propagation delay; and calibrating the clock skew of the target terminal based on the delay error. The time, frequency and link calibration of the access point and the target terminal can be completed by using the one-way time broadcast, and the calibration precision is high.

The invention relates to a computing resource collaborative deployment strategy for a satellite-ground fusion network. The computing resource collaborative deployment strategy comprises the following steps: step 1, establishing a model of the satellite-ground fusion network combining a low-orbit satellite network and a ground network; 2, establishing a satellite-ground fusion network task model according to the use condition of the Internet; 3, establishing a time delay model by considering the total propagation time delay and the total calculation time delay of tasks in the satellite-ground fusion network; step 4, considering energy consumption of a satellite edge server and energy consumption of a ground edge server in the satellite-ground fusion network, and establishing an energy consumption model; 5, establishing an optimization target by taking the time delay and the energy consumption as comprehensive indexes; and step 6, designing a QMIX-based satellite-ground fusion network computing power resource collaborative deployment strategy to dynamically realize computing resource collaborative deployment. According to the strategy, efficient cooperative utilization of satellite-ground resources can be achieved while task requirements are guaranteed, and good generalization ability and engineering practical value are achieved.

A base station may operate in a context where the propagation delay between the base station and user equipment (UE) devices is large. The base station configures UE devices with a common delay. The base station receives a random access preamble from a UE device. The base station determines a time slot in which the random access preamble was transmitted, based on a configured correspondence between allowable time slots and subsets of an available set of preambles. The base station computes a Random Access Radio Network Temporary Identifier (RA-RNTI) based on parameter values including an index, of the determined time slot. The base station employs the computed RA-RNTI to address a random access response for the UE device.

The invention discloses a renewable energy penetration power distribution system scheduling method and system based on a block chain, and relates to the technical field of power distribution system scheduling, and the method comprises the following steps: constructing a cross-hierarchy time sequence integrity observation layer, introducing a multi-source high-precision reference signal into a synchronous time service link, and carrying out the multi-source high-precision reference signal; the fingerprint acquisition module is used for acquiring external environment electromagnetic disturbance and atmospheric propagation delay data in real time and generating a phase offset fingerprint corresponding to a time service state; and performing causal decomposition operation based on the phase offset fingerprint, performing noise stripping processing on the acquired electromagnetic disturbance signal, and extracting a real time service error trajectory. Through combination of multi-source time service correction, phase fingerprints and virtual impedance time marks, time self-calibration and cross-node synchronization of the block chain power distribution system are realized, account book wrong sequence caused by time service drift is eliminated, power flow reversal is suppressed through time reversal traction and dynamic constraint, scheduling stability and energy flow consistency are ensured, and the power distribution efficiency is improved. The system safety and the clean energy utilization efficiency are improved.

Methods and systems to enhance NR RACH procedure to accommodate non-terrestrial networks (NTN) are disclosed. The length of the RAR window may be extended. In one aspect, a gNB of the NTN may perform blind retransmissions of the RAR message scheduled by DCI within the RAR window to user equipment to improve transmission reliability of the RAR message for NTN. The number of blind retransmission and the transmission pattern may depend on the PRACH reception condition, an uplink channel condition, or may be pre-configured. In one aspect, the gNB may extend the K1 value and K2 value that determine the delays between uplink and downlink transmissions to align the time domain duplex (TDD) uplink-downlink configuration due to the long propagation delays associated with the NTN. In one aspect, the gNB may broadcast or multicast RAR window size extension values to the UEs based on the orbital altitude of the satellites.

The invention relates to the technical field of underwater communication, in particular to a collision avoidance method suitable for digital underwater acoustic communication, which is characterized in that a neighbor propagation delay mapping database is maintained at each communication node, and inter-node propagation delay information is acquired through passive monitoring and active detection. When a node wants to send data, combining delay mapping to predict a channel occupation time slot, and judging whether the sending is conflicted with an RTS / CTS handshake stage, a data transmission stage and an ACK (Acknowledgement Character) confirmation stage which are carried out by a neighbor; if a conflict risk exists, the node delays to send the RTS and then initiates handshake until the security window is finished, so that collision caused by hidden nodes and exposed nodes is avoided, meanwhile, parallel transmission under the conflict-free condition is allowed, the channel space-time multiplexing efficiency is improved, the network throughput can be remarkably improved, the data packet collision rate is reduced, and the network performance is improved. And the node access fairness is improved.

Technology for data dependent control of a delay between a data strobe signal and data signals. The delay may be adjusted to compensate for data dependent impacts on propagation delays in an unmatched data in path and data strobe path. The delay between the data strobe signal and data signals may be adjusted based on a number of toggles in data to be sent to a memory die.

In a method of determining position information of a client device, reference devices include a master device and target devices. Target device clocks are synchronized with the master device clock based on one-way message information. For each of the target devices a first time correction is determined based on a two-way ranging message. A first message transmitted from / to the respective target device is timestamped by several target devices corrected for the first time correction. Position information of the client device is determined based on time-of-flight information of the first messages in which the first timestamp is corrected for the first time correction. As a result, the timestamps of the first messages applied by the target devices will experience a same offset error. Consequently, the corresponding pseudo-ranges will all have the same error. Typically, positioning algorithms are insensitive to constant errors in the pseudo-ranges or can easily deal with them.

The invention provides a method and a device used in a node for wireless communication. The method comprises the following steps: a first node determines propagation time delay according to a first parameter; and compensating the sending time of the first data in advance according to the propagation time delay. Wherein the first parameter comprises at least one of the following information: position information of the first node, ephemeris information of a service satellite, public timing advance, parameter effective time, reference signal sending time or an identifier of a track section where the satellite is located.

The invention provides a source-load-storage communication virtual network mapping method and device, and belongs to the field of communication. The method comprises the following steps: constructing a virtual network mapping model of source-load-storage communication; obtaining a region service request of a target region; wherein the regional service request comprises a plurality of virtual nodes and a plurality of virtual links, the virtual nodes comprise a starting node and a target node, and the virtual links are links between the corresponding starting node and the target node; according to the virtual network mapping model and the regional service request, establishing a target function for mapping the virtual nodes to the physical nodes by taking the minimum sum of propagation delays of all the physical nodes as a target; solving the objective function to obtain an optimal node mapping scheme; and based on the virtual network mapping model and the optimal node mapping scheme, mapping the plurality of virtual links to obtain a virtual network mapping scheme. The communication efficiency can be improved, and safe and economical operation of a power system is guaranteed.

The invention discloses a complex environment high-precision positioning system based on multi-signal-source cooperation, and belongs to the technical field of cooperative positioning, and the system specifically comprises the steps: receiving satellite, cellular base station and wireless access point signals based on a multi-source signal extraction module, and extracting carrier phase, propagation time delay and multipath reflection intensity distribution; the reflection weight generation module is used for identifying environmental characteristics according to multipath reflection intensity and generating a fusion weight set containing satellite phase dominant factors and the like; the measurement value constraint conversion module converts the measurement value into three types of distance constraint quantities; the constraint fusion field construction module carries out nonlinear superposition on the three types of constraint quantities according to weights to generate a three-dimensional probability density field; the elevation coordinate resolving module fuses the air pressure data compression resolving space, and positioning coordinates are obtained through iterative convergence; according to the invention, through cooperation of multi-source signals, the positioning precision and reliability in a complex environment are effectively improved.

The invention discloses a method for predicting the wall thickness of a metal pipeline by using a correlator, and relates to the technical field of wall thickness detection, and the method comprises the steps: placing the correlator in a to-be-detected pipeline; acquiring propagation delay time, and acquiring sound transmission speed based on the propagation delay time; a Beidou dual-mode positioning module is used for clock synchronization; the wall thickness of the to-be-measured pipeline is obtained based on the sound transmission speed obtained after clock synchronization; the method is used for solving the problems that in an existing metal pipeline wall thickness prediction method, when flowing liquid exists in a water supply pipeline, the precision of detection data is affected, meanwhile, due to the fact that the coverage direction of the water supply pipeline is large, the detection range of a sensor is limited, the overall thickness of the water supply pipeline cannot be effectively predicted, and the detection precision is affected. And detection vulnerabilities can be caused.

The invention provides a vehicle-mounted time synchronization method and device, and the method is applied to a vehicle-mounted network, and comprises the steps: obtaining the topology of the vehicle-mounted network, and determining a master clock and slave equipment according to the topology of the vehicle-mounted network; wherein the master clock and the slave device are connected through a network interface supporting a precise time protocol; broadcasting a synchronization message to the slave device through a preset frequency by using the master clock, wherein the synchronization message at least comprises a first timestamp of a moment when the synchronization message leaves the master clock through the network interface; receiving the synchronization message by using the slave device, and determining a second timestamp of the moment when the synchronization message reaches the slave device through the network interface; and pre-determining propagation delay, determining clock skew of the slave device according to the first timestamp, the second timestamp and the propagation delay, and synchronizing a local clock of the slave device according to the clock skew. The synchronization delay is avoided, and the time synchronization efficiency is improved.

The invention discloses a high-permeability new energy power distribution network collaborative optimization method, system and device and a storage medium, and belongs to the technical field of information, and the method comprises the steps: obtaining wind power plant operation data and signal intensity, processing and fitting a signal attenuation trend, recognizing mist environment path loss, obtaining a wind power output probability distribution function, and determining an output fluctuation range. Predicting an output deviation scene, calculating a wireless signal fluctuation probability, and extracting signal fluctuation characteristics; establishing a channel fading model in combination with mist path loss, outputting wireless signal propagation delay, and determining a potential delay interval of a scheduling instruction of the energy storage system; simulating dispatch out-of-order and power regulation instruction conflicts, and generating dispatch out-of-order evaluation data; combining historical wind power output data to judge power flow fluctuation, adjust an energy storage unit response sequence, generate a power adjustment instruction sequence, calculate adjusted power flow distribution data, and generate energy storage and topology configuration optimization data, so that the operation reliability and economical efficiency of the wind power plant are remarkably improved.

Methods and apparatuses disclosed herein provide for multiple cell round trip time (multi-RTT) measurements involving a user equipment (UE), where at least one of the multiple cells is associated with a non-terrestrial network (NTN) node. Advantageous operations include determining one or more propagation delays or offsets associated with the feeder and / or service links of the NTN node and determining positioning assistance data based on the delays or offsets. The positioning assistance data accounts for such delays or offsets in the context of measurement configurations and / or transmission timing at the UE and / or the NTN node.