26 results about "Signal propagation delay" patented technology

This invention discloses a ranging method and system based on a network data link, relating to the field of wireless communication ranging technology. The method includes the following steps: synchronizing the clocks of all nodes in the network and aligning the transmit and receive timings between nodes; each node in the network transmitting a synchronization signal within its allocated fixed transmission time slot according to a preset fixed frame structure; the receiving node calculating the theoretical time at which it receives the synchronization signal when the signal propagation delay is zero based on the synchronization clock and the preset fixed frame structure, and recording the actual time of receiving the synchronization signal; and the receiving node calculating the distance between itself and the node that transmitted the synchronization signal based on the time difference between the theoretical and actual times. This invention effectively eliminates ranging errors caused by crystal oscillator clock deviations between nodes, requires no external satellite signals or two-way signaling interaction, and achieves ranging by multiplexing the synchronization signal. It significantly reduces hardware costs while achieving high-precision, low-latency, and environmentally adaptable inter-node ranging.

The embodiments of the present disclosure provide a wireless communication method, a terminal device, and a network device. The network device can learn a difference between propagation delays from a serving satellite and a neighbor satellite to a terminal, thereby optimizing neighbor cell measurement configuration. The wireless communication method includes: transmitting, by a terminal device, first information including at least one of: signal propagation distance information from a serving satellite and a neighbor satellite of the serving satellite to the terminal device; signal propagation delay information from the serving satellite and the neighbor satellite of the serving satellite to the terminal device; or signal quality of the serving satellite and / or at least one neighbor satellite of the serving satellite as measured by the terminal device.

SOLUTION: A method for detecting satellite signal propagation delay variation includes: transmitting ephemeris data of a satellite and cell measurement window specifications to a terminal; receiving an indication from the terminal that a cell measurement signal will arrive at the terminal outside of a time frame defined by the cell measurement window specifications; modifying the cell measurement window specifications based on a difference in propagation delay between a serving cell, which defines the cell measurement window specifications, and a neighboring cell, which transmits the cell measurement signal, so that the cell measurement signal will arrive at the terminal within the time frame defined by the cell measurement window specifications, the satellite providing communication with the terminal for at least one of the serving cell and the neighboring cell; and transmitting modified cell measurement window specifications to the terminal.EFFECT: Satellite signal propagation delay variation can be compensated.SELECTED DRAWING: Figure 2A

This invention provides a remote smart lock control method based on a cloud platform, relating to the field of artificial intelligence technology. The method includes: the cloud platform sending a sound wave signal transmission command to the target smart lock, triggering the smart lock to send multi-band sound wave signals to preset auxiliary signal enhancement device deployment locations A and B; the cloud platform receiving sound wave feedback signals from locations A and B, calculating the final communication path based on signal propagation delay, frequency band interference intensity, and attenuation parameters, combined with real-time signal quality indicators reported by the remote communication module; and dynamically encrypting the command and sending it to the remote communication module through the final communication path. This invention dynamically calculates the optimal transmission path, breaking through the limitations of traditional single-channel transmission. Even in complex electromagnetic environments or obstacle-blocked scenarios, it can still ensure reliable transmission of control commands and reduce communication interruption rates.

The present technology relates to a light detection device and a ranging system that enable ranging accuracy to be improved. This light detection device is provided with: a readout circuit that outputs detection signals indicating the timing at which a light-receiving element detected reflected light resulting from the reflection of emitted light by an object; a time to digital converter (TDC) that counts time on the basis of the detection signals output from the readout circuit; a histogram generation unit that generates a histogram on the basis of the output of the TDC based on the detection signals; a first multiplexer that inputs, into a signal path between the readout circuit and the TDC, measurement signals for measuring propagation delay of signals in at least a portion of the signal path in time units smaller than the temporal resolution of the TDC; a propagation delay measurement unit that measures propagation delay on the basis of the output of the TDC based on the measurement signals in time units smaller than the temporal resolution of the TDC; and a correction unit that, on the basis of measurement results from the propagation delay measurement unit, corrects the output of the TDC based on the detection signals or the output of the histogram generation unit. The present technology can be applied, for instance, to a direct ToF type ranging device.

An integrated circuit comprises an oscillator which outputs a clock signal, a logic circuit portion, a detection circuit portion for detecting signal propagation delay relative to clock frequency, and a power supply which provides a configurable supply voltage. The detection circuit comprises a latch circuit portion, a delay circuit portion and a comparison circuit portion. The latch circuit portion outputs an alternating signal which changes state in dependence on the clock signal. This is received by the delay circuit portion which outputs first and second delayed signals respectively subject to first and second propagation delays each dependent on the supply voltage. The comparison circuit portion compares the alternating signal with the delayed signals, and outputs respective comparison signals if said signals indicate that the respective propagation delay is smaller than the clock signal period. A control circuit portion controls the supply voltage in dependence on the comparison signals.

The invention discloses a voltage-controlled crystal oscillator time-frequency synchronization method, device, medium and system based on data chain RTT, and belongs to the technical field of time-frequency synchronization of collaborative platforms, and the method comprises the following steps: S1, a sensor measures the RTT synchronization signal arrival time difference of a to-be-synchronized platform and a time reference; s2, calculating signal propagation time delay of inquiry and response between the platforms to obtain total motion time delay, resolving clock correction between the platforms by using an RTT algorithm, and compensating the clock correction through motion information and spatial position in a sensor to realize time synchronization; s3, inputting the compensated clock difference into a Kalman filter, and tracking the frequency offset between the platforms; and S4, after the frequency offset is obtained, adjusting the voltage-controlled crystal oscillator to realize frequency synchronization. The method solves the problem of clock error drift when the RTT algorithm is used for time synchronization, and has the advantages of low cost and high stability.

The application relates to a double-layer insulation low-loss high-speed cable and a preparation method thereof, which comprises two mutually parallel conductive cores and an insulator enclosed outside the lateral surfaces of the two conductive cores; the cross section of the insulator is in a circular shape or an elliptical shape, and the lateral surface of the insulator is uniformly provided with a plurality of mutually parallel grooves. The application effectively introduces air medium in the insulation layer by arranging the groove structure outside the insulator, reduces the equivalent dielectric constant of the insulation layer, significantly reduces signal propagation delay, and improves signal transmission speed; meanwhile, the groove design reduces the amount of insulating material, reduces the overall hardness of the cable, improves the softness and bending performance, and can better meet the application requirements of low delay, high bandwidth and high-density interconnection of the double-layer insulation low-loss high-speed cable in the AI and big data era.

Variations in satellite signal propagation delay can be compensated for by: transmitting satellite ephemeris data and cell measurement window specifications to the terminal; receiving an indication from the terminal that the cell measurement signal will arrive at the terminal outside the time frame defined by the cell measurement window specifications; modifying the cell measurement window specifications based on the propagation delay difference between the serving cell defining the cell measurement window specifications and the neighboring cells transmitting the cell measurement signal, so that the cell measurement signal will arrive at the terminal within the time frame defined by the cell measurement window specifications; the satellite providing communication with the terminal for at least one of the serving cell and neighboring cells; and transmitting the modified cell measurement window specifications to the terminal.

The utility model provides a device for converting a single-ended input signal into a differential output signal. The device comprises a conversion circuit, a buffer circuit and a routing circuit. The conversion circuit is configured to convert a single-ended input signal into a plurality of differential output signals. The buffer circuit is configured to amplify the plurality of differential output signals. The routing circuit is configured to route the single-ended input signal to the output of the conversion circuit and has a shorter signal propagation delay than the conversion circuit.

The invention discloses a distance measurement method based on frequency domain super-resolution and path geometric constraint and related equipment, and relates to the field of distance measurement. The method comprises the following steps: receiving a broadband detection signal sent by a sending end to obtain a received signal; performing frequency domain coherent processing on the received signal and a pre-stored broadband detection signal copy to obtain channel frequency response data; according to the calculated signal-to-noise ratio of each frequency point in the channel frequency response data, filtering the frequency points with the signal-to-noise ratio lower than a preset signal-to-noise ratio threshold to obtain effective channel frequency response data; based on the effective channel frequency response data, adopting a preset time delay algorithm to calculate direct signal propagation time delay of the direct path; and calculating a physical distance based on the direct signal propagation time delay and a calculation rule corresponding to a preset distance measurement mode. By implementing the above technical scheme, the accuracy of distance measurement in a multipath signal propagation scene is improved.

This invention discloses a hash algorithm data filling IP core based on FPGA, comprising: an end-to-end conversion module, a bit-width conversion module, a message processing module, a splicing module, and a FIFO module. This invention divides large functional modules into numerous smaller, single-function modules, which are connected via stream interfaces, thereby changing centralized control to distributed control. This simplifies inter-module interaction, reduces signal propagation delay, facilitates expansion and maintenance, and provides good fault tolerance. Parametric design increases adaptability.

The invention discloses a 4G base station satellite communication clock synchronization method based on an atomic clock, and relates to the technical field of satellite communication clock synchronization, and the method comprises the steps: collecting initial time references of a satellite portable station terminal atomic clock, a satellite load atomic clock and a baseband atomic clock calibration end, carrying out the deviation calculation of every two, and generating a synchronization ready signal; sliding window updating is carried out on the one-way signal propagation delay in the delay sequence buffer area, a synchronous correction step length coefficient is set in combination with the time deviation compensation amount, and the clock correction amount with step length scaling is obtained; issuing the clock correction with step size zooming to a satellite portable station terminal atomic clock, constructing a three-dimensional phase space trajectory, calculating a maximum Lyapunov index, and generating a preventive re-calibration instruction; and a preventive re-calibration instruction is sent to a satellite portable station terminal atomic clock, a satellite load atomic clock and a baseband atomic clock calibration end, and an optimized synchronous ready signal is generated. According to the invention, the robustness and timeliness of full-link synchronization are enhanced.

The invention discloses a communication voice quality evaluation method and device and electronic equipment. The method comprises the steps that a signal to be processed is acquired, the signal to be processed is divided into a target time frame with a preset length, and the preset length ranges from 50 milliseconds to 100 milliseconds; splitting the target time frame into a plurality of sub-blocks, and determining the Bark scale of each sub-block according to the scaling factor and the frequency of the target time frame; fusing the Bark scales of the plurality of sub-blocks to obtain a target Bark scale; and determining the target loudness of the target time frame according to the target Bark scale. According to the invention, the technical problem of inaccurate voice quality score caused by frame boundary mismatch and insufficient time domain masking effect when voice quality evaluation is carried out by using a traditional PESQ algorithm with short-time frame length due to relatively large signal propagation time delay in high-orbit satellite communication is solved.

Radio unit equipment that facilitates radio unit time alignment and delay characterization includes a buffer that stores input data received via a signal ingress point of the radio unit equipment, resulting in buffered data. The radio unit equipment also includes clock generation logic that provides a synchronized frame number (SFN) pulse to the buffer. The buffer releases the buffered data at a time corresponding to the SFN pulse and modified by a timing adjustment parameter, resulting in the buffered data proceeding from the buffer to a signal egress point of the radio unit equipment. Additionally, the buffer determines the timing adjustment parameter based on a defined signal propagation delay between the buffer and the signal egress point of the radio unit equipment.

The present application relates to a kind of high-speed cable and its preparation method, including two mutually parallel conductive core, and the insulator enclosed in the outer surface of two described conductive core;The cross section of the insulator is ∞, and the outer surface is uniformly provided with multiple mutually parallel grooves.The present application effectively introduces air medium in the insulating layer by setting groove structure outside the insulator, reduces the equivalent dielectric constant of the insulating layer, thereby significantly reduces signal propagation delay, improves signal transmission speed;At the same time, the groove design reduces the amount of insulating material, reduces the overall hardness of cable, improves softness and bending performance, can better meet the application demand of low delay, high bandwidth and high-density interconnection of high-speed cable in AI and big data era.

A secondary controller for a multiphase power converter includes a delay control circuit configured to adjust the timing of sending data back to a primary controller to account for signal propagation latency between the secondary controller and the primary controller. A synchronizer within the delay control circuit uses a second clock signal to sample a first clock signal sent by the primary controller. The second clock signal may then be used by an edge detection circuit configured to determine a time duration between a falling edge and a subsequent rising edge of the sampled version of the first clock signal. The time duration may be reduced using an offset to generate a shorter time duration using an offset trigger circuit. Following a countdown of the shorter time duration reaching zero, a trigger signal may be sent to a data transmission circuit configured to transmit data back to the primary controller.

The invention discloses a distributed real-time fault monitoring method and system, belongs to the technical field of optical communication network fault monitoring, and realizes high-sampling-rate continuous monitoring of optical power waveforms through distributed deployment of monitoring units. A millisecond transient fault is captured in real time by adopting an intelligent triggering algorithm based on the instantaneous change rate, the power reduction amplitude and dynamic threshold self-adaption; identifying and stripping a plurality of fault events which occur at the same time or in an overlapping manner by using a multi-event intelligent decoupling algorithm; and based on the relative time difference of the fault event on different monitoring units, the fault occurrence position is accurately calculated by combining optical signal propagation delay. According to the invention, real-time high-precision detection of millisecond transient faults is realized, real-time continuous monitoring can be carried out without interrupting services, the faults are accurately positioned to specific physical positions (such as 30km), multi-fault scenes are effectively processed, troubleshooting time is greatly reduced, and reliability and operation and maintenance efficiency of an optical network are remarkably improved.

A binary receiver combines a fast amplifier with a relatively slow amplifier for noise rejection. Both the fast and slow amplifiers employ hysteresis. The fast amplifier has relatively lower hysteresis, meaning that its sensitivity is a less effected by prior data values but more susceptible to glitch-induced errors. Conversely, the slow amplifier has relatively higher hysteresis and rejects glitches but introduces undesirable signal-propagation delays. A state machine taking input from both amplifiers allows the receiver to filter glitches without incurring a significant data-propagation delay.

The invention discloses a method and a system for detecting a medium positioning marker in a circular waveguide based on electromagnetic simulation. The method comprises the following steps: establishing a three-dimensional electromagnetic simulation model comprising a circular waveguide structure and at least one medium positioning marker arranged in the circular waveguide structure; performing electromagnetic simulation on the three-dimensional electromagnetic simulation model by adopting a time domain finite difference algorithm, and calculating and obtaining scattering parameters of the circular waveguide structure port; processing the scattering parameter to obtain an echo signal, and identifying at least one characteristic peak value related to the medium positioning marker from the echo signal; position information of the front surface of the medium positioning marker in the circular waveguide is calculated according to the signal propagation time delay corresponding to the characteristic peak value in combination with the propagation speed of the electromagnetic wave in the air filling section of the circular waveguide; and carrying out calibration or state monitoring on the circular waveguide assembly. According to the invention, accurate and non-intrusive detection of the position of the medium positioning marker in the circular waveguide can be effectively realized.

The invention relates to the technical field of blasting control, in particular to an underwater blasting multi-point synchronous detonation method based on delay control. In order to solve the problems of low multi-point triggering precision and poor triggering reliability caused by uncertain acoustic signal propagation delay, node clock drift and master control communication interruption in an underwater environment, the invention proposes that initial time reference calibration is carried out by establishing a safety communication link between a master control unit and a sub-control node; predicting propagation time delay based on hydrological observation data and a Medwin sound velocity model; generating a feedforward prediction compensation parameter by using Kalman filtering in combination with the historical clock skew sequence; the validity of the trigger instruction is autonomously judged in a distributed manner through majority voting or time window cross validation; and each sub-control node executes detonation operation in parallel according to the local high-precision clock and the compensation parameter, and records an execution log for synchronous precision evaluation.

A user equipment (UE), having Global Navigation Satellite System (GNSS) capabilities and capable of estimating a signal propagation delay between a non-terrestrial network (NTN) node and the UE based on Doppler frequency shift, is disclosed. The UE includes one or more non-transitory computer-readable media having computer-executable instructions embodied thereon, and at least one processor coupled to the one or more non-transitory computer-readable media, and configured to execute the computer-executable instructions to: transmit a GNSSOutageUE indication of a GNSS outage of the UE to a ground-based base station communicatively coupled to the NTN node; wherein the GNSSOutageUE indication is transmitted in at least one of: uplink control information (UCI); a periodic Channel State Information (CSI) report with CSI information; a Medium Access Control (MAC) Control Element (CE); and a Physical Uplink Control Channel (PUCCH).

This application discloses a computing system to identify a path within a physical layout design of an integrated circuit. The path can have a cell configured to drive a current through a plurality of stages to a sink pins in the integrated circuit. The computing system can generate a timing for the path using non-recursive convolution to determine responses at each of the stages based on the current and loads associated with the stages, and determine a delay for signal propagation on the path based on the timing associated with stages of the path. The computing system can identify at least one timing violation for the path based on the delay for signal propagation on the path, generate a timing report including the path, the delay for signal propagation on the path, and the timing violation for the path, and modify the physical layout design based on the timing violation.

The application relates to a distributed real-time fault monitoring method and system, belonging to the technical field of optical communication network fault monitoring, which realizes high-sampling-rate continuous monitoring of optical power waveforms through distributed deployment of monitoring units; adopts an intelligent triggering algorithm based on instantaneous change rate, power drop amplitude and self-adaption with a dynamic threshold to capture millisecond-level transient faults in real time; utilizes a multi-event intelligent decoupling algorithm to identify and strip multiple fault events occurring simultaneously or overlapping; and based on the relative time difference of fault events on different monitoring units and in combination with optical signal propagation delay, accurately calculates the fault occurrence position. The application realizes real-time high-precision detection of millisecond-level transient faults, can perform real-time continuous monitoring without interrupting services, accurately locates faults to specific physical positions (such as 30 km), effectively handles multiple fault scenarios, greatly reduces fault troubleshooting time and significantly improves the reliability and operation efficiency of optical networks.

To provide a wireless terminal testing device that makes it easy to determine the timing difference of uplink signals and to easily perform timing adjustment of uplink signals. [Solution] The system includes a delay addition unit 12 that adds a signal propagation delay amount calculated from the satellite and the position information of the satellite to the uplink signal from the UE100 and outputs it; a timing generation unit 13 that generates a downlink signal in synchronization with the Subframe timing and synchronizes with the UE100; a power measurement unit 14 that measures the power of the uplink signal received from the UE100 at predetermined time intervals; a reception processing unit 15 that performs reception processing of the received uplink signal; a heatmap generation unit 16 that displays the power measurement values ​​measured by the power measurement unit 14 as a heatmap arranged in chronological order on a display unit 18; and a timing deviation detection unit 17 that overlays the position of the 3GPP standard NPRACH on the heatmap and displays it surrounded by a frame.

The invention relates to the technical field of satellite positioning, in particular to a tamping point guiding method and system fused with Beidou positioning signals. The method comprises the following steps: in a plurality of resolving satellites at a target positioning moment, calculating a signal propagation distance, a signal propagation delay and an ambiguity resolving value of each resolving satellite according to the signal propagation distance, the signal propagation delay and the ambiguity resolving value of each resolving satellite; constructing a cross cost matrix according to the resolving reconstruction phase value and the carrier phase observation value of each resolving satellite; feature analysis is carried out on the cross cost matrix to obtain resolving feature information, and the resolving feature information comprises a mismatching feature, an instability feature and a cost feature; and processing the resolving feature information according to a preset control strategy to obtain tamping point positioning detection information at a target positioning moment. According to the method, the use of an abnormal tamping point positioning result with extremely high confidence degree and position deviation of several decimeters can be inhibited, and the application effect of a real-time dynamic difference technology in a dynamic tamping operation scene is improved.