48 results about "Signal propagation delay" patented technology

The invention provides a multi-parameter fusion drilling tool state intelligent diagnosis method, device and equipment, and the method comprises the steps: determining a stable working period through obtaining basic operation parameters of a drilling tool, and applying specific frequency excitation vibration to the drilling tool in the stable period to form an active propagation wave; a multi-point monitoring technology is adopted to obtain a response vibration signal and extract a time sequence, and a time sequence offset is obtained through differential processing; identifying a signal propagation delay section based on the time sequence offset, extracting actual propagation time, comparing the actual propagation time with standard propagation time to generate a time delay abnormal value, and determining an internal state change position; a high-damage section is determined by combining energy dissipation analysis, and fault positioning information is generated through spatial superposition; performing frequency sensitivity analysis by utilizing the damage characteristic parameters, capturing a resonance response peak value through frequency sweep excitation, and forming a secondary diagnosis result in combination with the wear severity; and finally, determining a fault development rate, generating a partition maintenance instruction, and completing intelligent diagnosis of the drilling tool state.

The invention provides a remote intelligent lock control method based on a cloud platform, and relates to the technical field of artificial intelligence, and the method comprises the steps that the cloud platform issues a sound wave signal emission instruction to a target intelligent lock, and triggers the intelligent lock to send multi-band sound wave signals to a preset auxiliary signal enhancement device deployment position A and a preset auxiliary signal enhancement device deployment position B; and the cloud platform receives sound wave feedback signals returned by the position A and the position B, calculates a final communication path based on signal propagation time delay, frequency band interference intensity and attenuation parameters in combination with a real-time signal quality index reported by the remote communication module, and sends a dynamic encryption instruction to the remote communication module through the final communication path. According to the method, the optimal transmission path is dynamically calculated, the traditional single channel transmission limitation is broken through, reliable transmission of the control instruction can still be guaranteed in a complex electromagnetic environment or an obstacle shielding scene, and the communication interruption rate is reduced.

The invention relates to the technical field of signal processing, and discloses a velocity vector sensing method and device, equipment, a storage medium and a product, and the method comprises the steps: carrying out the down-conversion and matched filtering of a pilot signal transmitted by a user side, obtaining a target discrete signal sequence, carrying out the fast Fourier transform of the target discrete signal sequence, and obtaining a target discrete signal sequence; and determining a signal frequency sequence based on a discrete Fourier transform result, determining a frequency increase rate and a Doppler offset according to the signal frequency sequence, obtaining a signal propagation delay according to the discrete Fourier transform result, and further determining a velocity vector sensing result of the user side. According to the invention, hardware complexity and power consumption are reduced through down-conversion and matched filtering processing, and the signal-to-noise ratio is improved; according to the method, fast Fourier transform and inverse fast Fourier transform are combined, a signal frequency sequence, signal propagation time delay, frequency increase rate and Doppler offset are extracted, the velocity vector of a user side is sensed comprehensively, and the limitation that only part of parameters can be sensed in the prior art is overcome.

The invention discloses a multi-receiving-station clock synchronization method, system and device, a medium and equipment, and relates to the technical field of radio detection. The method comprises the following steps: controlling a civil radiation source to synchronously transmit target signals to a plurality of receiving stations; each receiving station carries out frame structure analysis on the received target signal and determines a frame header starting moment; calculating the clock skew of each receiving station based on the signal propagation time delay between each receiving station and the civil radiation source and the corresponding frame header starting time; and correcting a local clock of each receiving station by using the clock skew so as to eliminate a time difference of arrival (TDOA) among the multiple receiving stations. According to the method, the clock skew between the receiving stations is accurately calibrated, the precision of multi-station cooperative positioning is effectively improved, and the method is particularly suitable for a high-precision radio detection scene in a complex environment.

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.

Methods and apparatuses for comparing redundant signals in functional safe systems are provided, including methods for mitigating differing signal path delays and for signal weighting of the redundant signals are proposed. An Apparatus includes a first signal path for a first measurement signal of a physical quantity, the first signal path having a first signal propagation delay; a second signal path for a second measurement signal of the physical quantity, the second signal path having a second signal propagation delay different from the first signal propagation delay; a delay compensation circuit configured to compensate for a difference between the first and second signal propagation delays to generate delay-compensated first and second measurement signals; and comparison circuitry configured to compare the delay-compensated first and second measurement signals.

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.

The invention belongs to the technical field of navigation receivers, and relates to a CP-OFDM signal navigation receiving method and a navigation receiver. The method comprises the following steps: performing down-conversion on a received CP-OFDM signal to obtain an intermediate frequency signal; sending the intermediate frequency signal into an incoherent delay tracking loop, wherein the incoherent delay tracking loop comprises a leading branch, an instant branch and a lagging branch; the leading branch and the lagging branch process the intermediate frequency signal to obtain coherent integral amplitudes respectively; when the two branches process the intermediate frequency signal, local copy signals are generated firstly, and the protection interval of the local copy signals is filled to be zero; calculating according to the amplitude of the coherent integration of the two branches to obtain signal propagation time delay; eliminating noise to obtain a filtered time delay value; and estimating the time delay experienced by the received signal based on the filtered time delay value, and estimating the position information of the receiver. The problem that the cyclic prefix and the adjacent frequency points in the CP-OFDM signal influence the navigation tracking precision is solved.

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.

The invention particularly relates to a short-wave time service signal propagation delay prediction method and device, and the method carries out the training of a short-wave time service signal propagation delay prediction model based on prior data, does not need the support of ionosphere data, and only needs several times of simple multiplication and one time of logarithmic operation after a user obtains model parameters. Solving of a differential equation is not involved, and implementation is easy. Besides, since the prediction model fits the time variation of the ionosphere, not only can the higher time delay prediction precision be maintained, but also the parameter model is kept unchanged in the same day time, the signal propagation time delay can be calculated only by acquiring the parameter model once and measuring the signal level in real time, and the parameter model does not need to be frequently acquired.

The invention provides a circuit structure for solving single-particle inversion and a method for solving single-particle inversion. The circuit structure comprises three groups of two-input NAND gates and a three-input NOR gate, wherein the three groups of two-input NAND gates are formed by transforming a first six-transistor static memory unit, and the three-input NOR gate is formed by transforming at least one second six-transistor static memory unit. And the outputs of the three groups of NAND gates are connected to the input of the NOR gate so as to realize a majority voting function on the three paths of redundant input signals. According to the embedded majority voter, the circuit connection of the standard static memory unit is reconstructed, and the embedded majority voter is realized by multiplexing the existing resources on the premise of not changing the layout of a bottom transistor. Compared with the prior art, the scheme effectively solves the problems of extra signal propagation delay and chip area overhead caused by the adoption of an external voter, improves the integration level and time sequence performance of the circuit, and is highly compatible with a standard process.

Satellite-terrestrial communications according to particular protocols when signal propagation delays exceed design assumptions of the particular protocols, such as when an orbital base station communicates with a terrestrial user equipment (UE), might be addressed as described herein. This can involve dynamic compensation for frequency shift, catered to a cell median Doppler contour, (2) a first dynamic compensation for delay and delay rate of change, on a downlink signal only, catered to a weighted centroid (e.g., geographical median) delay rate of change contour, and (3) a second dynamic compensation for delay and delay rate of change, on an uplink signal only, catered to the remaining round-trip delay not yet accounted for by the first dynamic compensation for delay and delay rate of change used on the downlink.

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.

A radio unit device that facilitates radio unit time alignment and delay characterization includes a buffer that stores input data received via a signal entry point of the radio unit device, thereby producing buffered data. The radio unit device also includes clock generation logic that provides a synchronization 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 such that the buffered data travels from the buffer to a signal exit point of the radio unit device. Additionally, the buffer determines the timing adjustment parameter based on a defined signal propagation delay between the buffer and the signal exit point of the radio unit device.

Satellite-terrestrial communications according to particular protocols when signal propagation delays exceed design assumptions of the particular protocols, such as when an orbital base station communicates with a terrestrial user equipment (UE), might be addressed as described herein. This can involve dynamic compensation for frequency shift, catered to a cell median Doppler contour, (2) a first dynamic compensation for delay and delay rate of change, on a downlink signal only, catered to a weighted centroid (e.g., geographical median) delay rate of change contour, and (3) a second dynamic compensation for delay and delay rate of change, on an uplink signal only, catered to the remaining round-trip delay not yet accounted for by the first dynamic compensation for delay and delay rate of change used on the downlink.

The invention relates to the technical field of power supply control, and discloses a control method and system for realizing a power supply based on a wireless signal technology, and the method comprises the steps: carrying out the high-frequency harmonic component stripping processing of an original environment reflection signal, and obtaining an electromagnetic characteristic signal; identifying a direct wave component and a reflected wave component of the electromagnetic characteristic signal so as to calculate a signal propagation time delay and a signal attenuation coefficient of the electromagnetic characteristic signal in the signal transmission path; the method comprises the steps of constructing a three-dimensional electromagnetic field model of a target area, identifying harmonic characteristics of power equipment in the target area, detecting and monitoring backscattering signals in real time based on the harmonic characteristics so as to analyze energy absorption characteristics of the power equipment, and constructing an energy consumption demand curve of the power equipment based on the energy absorption characteristics; and performing power supply time sequence scheme optimization on the power supply equipment to perform parameter adjustment on the pre-configured phased array to obtain adjusted signal equipment, and performing power supply control on the power supply equipment. According to the invention, the accuracy of power supply control can be improved.

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.

The present application relates to the technical field of electronic harnesses, and specifically provides a method for processing anti-interference electronic harnesses, comprising: generating an impedance distribution curve through time domain waveform analysis, wherein the accuracy of the impedance distribution curve reaches the ohm level, identifying the reflection peak of the discontinuous point and the waveform baseline noise level, and determining the specific location of the impedance mutation; adjusting the connector size and via spacing in the bus structure according to the reflection peak of the discontinuous point in the impedance distribution curve, optimizing the path length for the signal propagation delay time, and reducing the attenuation rate of the reflected signal; constructing a virtual model of the bus structure using three-dimensional modeling software, importing the adjusted connector size and via spacing, setting the geometric parameter grid density to thousands of points per millimeter, and generating a digital twin; and using a frequency domain analysis method to calculate the input signal amplitude range and vibration mode frequency range of the optimized bus structure, and verifying whether the electromagnetic field coupling strength meets the matching requirements.

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.

An apparatus, including: a simulator configured to estimate signal propagation delays for a plurality of conductive trace structures, wherein the conductive trace structures include at least one tabbed routing structure; a compensator configured to determine trace-specific delay compensation values based on measured actual signal propagation delays obtained from PCB test coupons that include the tabbed routing structure and calculate compensated physical trace lengths using the trace-specific delay compensation values to achieve signal timing alignment; and a correlator configured to correlate estimated signal propagation delays with the measured actual signal propagation delays.

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.

A test device determines a Global Navigation Satellite System (GNSS) signal propagation delay in a GNSS signal distribution system (GSDS) for a radio access network, and can further perform long-term tests on a GSDS without having access to a GNSS satellite. The test device includes a GNSS receiver and a clock that can be re-tuned to accommodate performing tests on the GSDS.

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.

A user equipment (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: estimate a first Doppler frequency shift in a signal received from a non-terrestrial network (NTN) node at a first time instance, estimate a second Doppler frequency shift in the signal at a second time instance, estimate a signal propagation delay between the NTN node and the UE based on the first Doppler frequency shift and the second Doppler frequency shift, and apply the signal propagation delay to compensate for an uplink transmission from the UE to the NTN node.

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.