326 results about "Pulse pair" patented technology

A clock synchronization system and method are provided. The clock synchronization system includes: a pulse generation module, configured to receive an input first signal, perform sampling processing of the first signal to obtain a second signal, and generate a pulse signal according to the second signal; a voltage-controlled oscillator, configured to output a first output clock; the output frequency divider module, configured to perform frequency division on the first output clock, and synchronize, according to the pulse signal, the first output clock which has been subjected to the frequency division, so as to obtain a second output clock; and the synchronous output module, configured to receive the first output clock, the second output clock, the first signal, and the pulse signal, and perform synchronization processing on the first signal according to the first output clock, the second output clock and the pulse signal, so as to obtain a third signal.

The invention discloses a detection method of a high-speed connector and a related device, and the method comprises the steps: carrying out the plugging motion control of the high-speed connector, injecting a pulse sequence carrying a displacement mark into a differential signal pair in the process, and obtaining the initial reflection data containing a plugging displacement-time index; space-time boundary information of a gap coupling section, an initial touch deformation section and a full-insertion steady-state section is analyzed and determined in a segmented mode through reflection characteristics. And generating a mutual excitation pulse pair in the initial touch deformation section, and executing differential sampling processing by using a thermal-electric coupling effect to obtain a thermally induced group delay sequence and a geometrically induced impedance differential sequence. A dynamic zero-reflection anchor point is generated based on double-sequence fusion, and real-time reference plane migration processing is realized to obtain a calibration impedance curve. And repeating the processes of insertion and extraction, generating an elastic difference curve through displacement-time coaxial difference processing of a bidirectional calibration impedance curve, and positioning an irreversible abnormal section of the impedance. According to the method, the plugging transient impedance change can be continuously monitored, and the early failure risk of the high-speed connector can be evaluated in time.

The invention relates to the technical field of spectrum detection and optical imaging, and provides a time domain stimulated Raman scattering method and system.The method comprises the steps that pumping pulses or Stokes pulses are modulated, two stimulated Raman excitation pulse pairs with adjustable relative delay are introduced, a to-be-detected sample is excited to generate transient stimulated Raman scattering, and the time domain stimulated Raman scattering is obtained; transient stimulated Raman scattering signals can be obtained, acquisition of hyperspectral data covering hundreds of wave numbers can be achieved only through single excitation, and the method has the advantage of being high in time resolution. Meanwhile, the spectral resolution of the vibration level life broadening limit can be obtained through the method, and the main technical bottleneck faced by the traditional stimulated Raman scattering spectrum technology can be solved at a time. The method can be applied to the fields of Raman scattering imaging, spectrum detection, related Raman probes and the like.

The invention discloses a live detection method for insulation defects of high-voltage power equipment. The method comprises the following steps: firstly, synchronously arranging ultrahigh frequency sensors and acoustic emission sensors on a plurality of monitoring points on the surface of a gas insulated switchgear shell to form an array, and synchronously acquiring signals for filtering pretreatment; then, pulse events are extracted from the two types of signals respectively, and associated pulses in a time window are matched into matched pulse pairs representing the same discharge source; then, carrying out time-frequency transformation on the ultrahigh frequency and acoustic emission pulse waveform in each matched pulse pair, carrying out joint noise reduction by calculating a coherence coefficient between time-frequency distribution matrixes, and extracting a joint feature vector containing an energy ratio, a time parameter ratio and a frequency difference from the denoised time-frequency matrix; according to the invention, multi-source signals are fused, and high-sensitivity detection, high-precision positioning and high-accuracy identification of insulation defects are realized.

The invention belongs to the technical field of communication navigation, and particularly relates to a covert communication method based on TACAN navigation. Inserting an immediate pulse pair into an auxiliary reference pulse of the TACAN signal emission pulse sequence; and performing channel coding on the subsequent pulse pair for transmitting communication data. The uplink transmission communication data frame of the ground control tower sequentially comprises packet header data, first channel estimation data SINBAL1, first effective data DATA1, second channel estimation data SINBAL2, second effective data DATA2 and protection data from front to back; and the lengths of the two bytes are respectively 6 bytes, 2 bytes, 4 bytes, 2 bytes, 4 bytes and 2 bytes.

The invention discloses a radio frequency voltage sensor and a plasma source system. The radio frequency voltage sensor comprises a signal acquisition module and a signal processing circuit. The signal processing circuit comprises a rectangular wave pulse detection module, a signal conversion module, a peak holding module and an operation output module; the input end of the rectangular wave pulse detection module receives a pulse synchronization signal; the signal conversion module is connected with the output end of the signal acquisition module; the first input end of the peak holding module is connected with the output end of the signal conversion module, and the second input end of the peak holding module is connected with the output end of the rectangular wave pulse detection module; and the operation output module is connected with the output end of the peak holding module. According to the radio frequency voltage sensor and the plasma source system provided by the invention, the peak voltage corresponding to the single-stage pulse can be accurately detected, the peak voltage corresponding to the multi-stage pulse can also be stably detected, the output is prevented from jumping to zero during the pulse closing period, and the stability and practicability of measurement are improved.

In some aspects, an electronic device may receive a clock signal having a first frequency. The electronic device may receive, for a chip select training operation, a chip select signal having a pattern including high pulses and low pulses. The electronic device may perform, for a sampling window, the chip select training operation using the clock signal and the chip select signal, wherein the sampling window includes a quantity of pulses of the chip select signal. The electronic device may provide, via a first data in or out (DQ) pin, an indication of a first result of the chip select training operation for the high pulses of the chip select signal. The electronic device may provide, via a second DQ pin, an indication of a second result of the chip select training operation for the low pulses of the chip select signal. Numerous other aspects are described.

The invention provides a synthetic aperture radar imaging radio frequency interference detection method and system, and the method comprises the steps: S1, setting an SAR working time sequence design for radio frequency interference feature collection; s2, observing earth through an SAR satellite to obtain original echoes; s3, according to the working time sequence of the SAR, interference detection is carried out on echo data corresponding to SAR non-transmitted pulses, interference parameters are extracted at the same time, and a radio frequency interference signal model is established; s4, according to the radio frequency interference signal model parameters and original echoes, interference detection and suppression are carried out on echo data corresponding to each transmitted pulse again; and S5, outputting SAR echo data after interference suppression, and performing focusing imaging processing. The method can effectively solve the interference signal-to-noise ratio problem of SAR satellite interference detection, improves the interference detection and suppression capability, and can provide important technical support for the future SAR system design.

A method of operating a distance sensor includes emitting pulses of light from an emitter on the distance sensor at one or more designated wavelengths in a non-visible spectrum and receiving a set of reflected pulses of light with a receiver on the distance sensor that correspond to the pulses of light reflected off a surface of an object within a line-of-sight of the receiver. A point cloud is generated of an area including the surface of the object based on the set of reflected pulses of light. A pattern is identified on a surface of the object based on at least one of an area of increased or decreased reflectivity for the one or more designated wavelengths in the non-visible spectrum identified in the point cloud. Embedded data is decoded from the pattern on the surface of the object.

A method performed by a node of a quantum key distribution (QKD) network includes receiving, from a hub of the QKD network, a user-node pulse train of optical-pulse pairs, each of the optical-pulse pairs comprising a first pulse and a second pulse having an optical phase shift relative to the first pulse. The method further includes splitting the user-node pulse train into first and second pulse trains, calibrating an asymmetric Mach-Zehnder interferometer with the first pulse train, blocking the second pulse of each of the optical-pulse pairs of the second pulse train to generate a filtered pulse train, splitting the filtered pulse train into a timing pulse train and a pre-qubit pulse train, delaying the pre-qubit pulse train into a delayed pulse train, and encoding the delayed pulse train into a photonic-qubit pulse train and transmitting the photonic-qubit pulse train to the hub.

The invention discloses a tower positioning system and method for a Brillouin optical time domain analyzer based on differential pulses, and relates to the technical field of optics. The system comprises a data acquisition module and a data processing module. Wherein the data acquisition module is used for acquiring a Brillouin time domain signal returned by an optical fiber to be detected, and the data acquisition module comprises a pump light modulation sub-module, a probe light modulation sub-module and a data acquisition card; the pump light modulation sub-module is used for carrying out pulse width and amplitude modulation on the pump light and coupling the modulated light pulse into an optical fiber to be measured; the detection light modulation sub-module is used for performing frequency modulation on the detection light intensity and coupling the reference light after frequency modulation into the optical fiber to be detected from the other end; the data acquisition card is used for acquiring a Brillouin time domain signal; and the data processing module is used for processing the Brillouin time domain signal to obtain a straight line tower position between the two welding points. The method has high precision and high sensitivity, and can improve the positioning accuracy and reliability of the tower.

The present invention discloses a three-point auxiliary positioning method and device for invisible pulse laser processing focus. By setting a coaxial pinhole device and combining multiple image algorithms with translation stage feedback, real-time focus tracking is achieved, positioning accuracy is improved, and anti-interference ability is enhanced. There is no need for repeated calibration after the first calibration, which improves processing efficiency. The equilateral triangle structure is used to suppress single-point errors, and the processing defocus amount and whether the vertical processing requirements are met can be quickly determined. The overall cost is reduced and the operational safety is improved. The positioning of the pulse focus is mainly determined by the image acquisition algorithm, and its focus calibration is replaced by three visible light indicator lasers. There is no need to use expensive photoelectric detection equipment. In addition, the entire calibration process is mainly completed by a computer or other controller, avoiding the harm of invisible pulses to operators.

The invention belongs to the technical field of radio metering detection, and particularly discloses a time difference and angle measurement method and device for a microwave navigation landing system and a medium, and the method comprises the steps: responding to a received barker code, obtaining reference time, and carrying out the time synchronization; obtaining a scanning pulse according to the scanning interval and the back-scanning interval; analyzing and extracting the A / D sampling signal according to the scanning pulse to obtain a forward scanning beam and a backward scanning beam in the scanning pulse; obtaining a scanning time difference according to the forward scanning beam and the backward scanning beam; according to the scanned time difference, analysis is carried out based on non-constant clock counting, and a time difference signal is obtained; obtaining MLS angle data based on preset space angle position coding data according to the time difference signal; the invention aims to solve the problems of weak anti-interference acting force and low angle guiding precision of a microwave navigation landing system in the prior art.

The invention discloses an end-to-end radar working mode identification method based on hierarchical density clustering and an encoder, and the method comprises the steps: firstly obtaining the pulse repetition interval PRI, PW pulse width and carrier frequency RF data of a radar pulse, and constructing a radar pulse sequence; and meanwhile, recording an initial working mode label corresponding to each pulse. Secondly, inputting a radar pulse sequence for preprocessing to obtain a preprocessed radar pulse sequence; and finally, performing working mode identification on the preprocessed radar pulse sequence through an encoder structure neural network model, and outputting a working mode corresponding to the radar. According to the method, the input sequence quality is remarkably improved, data interference is reduced, and the recognition rate of a complex radar working mode is improved.

The invention provides a vehicle OTA upgrade method and upgrade system based on quantum encryption, relates to the technical field of vehicle OTA upgrade, and is applied to a server, and the server and a vehicle establish a quantum channel and a classical channel through an optical fiber interface integrated on a charging pile. The method comprises the following steps: in response to a received quantum state light pulse which is sent by a vehicle through a quantum channel and is coded with a random first basis vector, measuring the light pulse; comparing a second basis vector for measurement with the first basis vector in a classic channel, screening a matching result to obtain a first key, and determining the quantum bit error rate of the first key; if the quantum bit error rate is smaller than the bit error rate threshold, compressing the first key to obtain a second key; and encrypting an OTA upgrade package obtained from the main engine plant cloud platform based on the second key, sending the OTA upgrade package to the vehicle through the optical fiber interface, and decrypting the vehicle to complete upgrade. According to the method, the information leakage risk is effectively eliminated by utilizing quantum characteristics and combining quantum bit error rate judgment, compression processing and the like, so that the security of OTA upgrading is improved.

A Y-branch type phase-change all-optical Boolean logic device comprises a waveguide of a Y-branch structure and phase change function units covered over the waveguide. In the logic implementation method, a light pulse having a large power is employed to perform a write operation on the phase change function unit, so that the phase change function unit is heated to generate a crystallization or amorphization phase change, thereby causing a difference in optical properties under two states; the state of the phase change function unit is read by employing a light pulse having a small power, and the state of its phase change material is not changed. By defining input logic signals respectively and defining three operation steps, an operation mode reconfigurable logic can be implemented, and all 16 binary Boolean logic calculations are implemented in a simple structure by means of step-by-step operation.

Disclosed in the present application are a pulse digitization method and apparatus, a correction method and apparatus, and an electronic device and a storage medium. The pulse digitization method comprises: providing amplitude-energy mapping relationship data of a plurality of reference pulses; setting a plurality of energy channel addresses or amplitude channel addresses having representation values; on the basis of results of comparison between amplitudes of a plurality of pulses to be measured and amplitude representation values of the plurality of channel addresses, determining channel addresses corresponding to the plurality of pulses to be measured; and on the basis of the count of pulses to be measured that are in each channel address and the amplitude-energy mapping relationship data or energy representation values of the energy channel addresses, obtaining energy information of the plurality of pulses to be measured. In the present application, complex fitting calculation that is required in a conventional oil exploration process is avoided, and energy information of pulses is directly and quickly obtained by means of threshold value comparison, thereby greatly shortening the dead time of the operation of a collection circuit, and improving the signal collection performance and efficiency. The present application is especially suitable for an ultra-high-temperature environment.

The invention discloses an SAR interference suppression method based on echo asynchronous pulse detection, and the method comprises the steps: constructing a local odd-even channel comparison mode or a global reference pulse comparison mode, directly carrying out the processing in a time domain of an SAR echo data matrix, determining a corresponding mode through the energy characteristics of an interference signal, and carrying out the detection of the interference signal. Constructing a channel difference mask and an outlier mask in the corresponding mode, and finally obtaining an interference mask in each mode; establishing a mask matrix based on the interference mask, and processing the amplitude matrix to obtain an amplitude matrix after interference suppression processing; and combining the phase matrix to obtain a final non-interference SAR echo data matrix. According to the method, interference artifacts brought to SAR image data by the forwarding type coherent interference can be suppressed, and the phenomenon of sidelobe deterioration of strong scattering points in the image after frequency domain notch is eliminated, so that the forwarding type coherent interference existing in the SAR echo data is effectively suppressed.

The invention relates to the technical field of non-electrical variable control or regulation systems, and discloses an exhaust gas aftertreatment flow channel back pressure dynamic regulation method, which comprises the following steps: acquiring a supply source phase reference signal and establishing cyclic mapping; a fluid channel pressure signal pulse range change rate is extracted to determine a feed-forward factor; determining a pressure signal trough interval as an action window; determining a reference amplitude based on the feedback deviation and using a feed-forward factor for compensation to determine a target adjustment instruction; the adjusting mechanism is driven to move in the action window, so that the response peak value is locked in the trough interval, the adjusting action is locked in the low-energy phase, kinetic energy intervention of fluid pulses on the adjusting mechanism is avoided, and mechanical abrasion is reduced; pulse characteristic feed-forward compensation is utilized to enable an adjusting instruction to sense the trend of a flow field, the response speed is increased while a signal is smoothed, and pressure balance under the transient working condition is maintained.

The present invention relates to the field of micro-displacement detection technology, and specifically to a micro-displacement radar detection method, system, equipment and storage medium, and the steps are as follows: the radar transmits multiple groups of linear frequency modulation signals with different carrier frequencies for detection, and each group of signals includes multiple pulses; the echo received by each pulse is subjected to FFT transformation, and the results after FFT processing of all pulse groups are accumulated to obtain the range Doppler matrix of any pulse group; the range Doppler matrix of the first pulse group is subjected to target detection to obtain the detection target position, and the radar is repeatedly transmitted, and the fuzzy displacement is obtained by solving the phase difference of the detection target position; the phase difference between the detection target position and the detection target position of the subsequent pulse group is solved to obtain the rough displacement; the fuzzy displacement is solved based on the rough displacement to obtain the real displacement of the target. The present invention can increase the target signal-to-noise ratio, improve the detection capability and stability, and can accurately solve the target displacement even if the target displacement is greater than the radar wavelength.

The invention provides a differential driving method of an ultrasonic transducer, which relates to the technical field of ultrasonic transducers, and comprises the following steps: S1, circuit connection: connecting circuit elements, arranging six control pins on a control chip, and respectively connecting each control pin to a corresponding position in a circuit; and the UT2 is used as a receiving end for transmitting and receiving ultrasonic waves. According to the differential driving method of the ultrasonic transducer, negative pulses are given through fire1n and fire2n, differential driving is carried out on the transducer, the amplitude of received electric signals is increased, and stronger electric signals can be received under the conditions that the working voltage is low and signal attenuation in media is large, so that the differential driving method is suitable for flow velocity measurement of more media, and the application range is wide. The added differential drive does not cause the voltage at the two ends of the transducer to change suddenly, and in application, the two ends of the transducer are grounded during dormancy, so that the transducer does not pressurize for a long time, and the service life of the system is prevented from being shortened due to the newly added function.

The present disclosure relates to a system and a method of performing Gaussian boson sampling via time multiplexing correlation of squeezed vacuum states for quantum information experiments. One embodiment relates to a method for performing Gaussian boson sampling comprising the steps of—generating a set of pulsed pairs of squeezed vacuum states,—performing time 2024 / 038212 multiplexed correlation of multiple of such pairs of squeezed vacuum states,—measuring, via a homodyne detection, a state from the pairs of generated squeezed vacuum states,—feed-forwarding the homodyne result of the measured states to a displacement unit,—performing displacement operations on the remaining state from the pairs of generated squeezed vacuum states, and—counting the states output from the displacement unit.

The utility model discloses a thermocouple measuring device, comprising a TC input module used for collecting thermocouple voltage and successively carrying out bias processing and signal filtering conditioning; the cold end compensation module is used for acquiring the RTD voltage of the cold end of the thermocouple on the field side; the ADC module is used for sending the RTD voltage and the thermocouple voltage to the MCU control unit; the MCU control unit is used for calculating the real voltage of the thermocouple and obtaining the actual temperature value of the thermocouple according to the real voltage; the isolation module is used for isolating signals of the field side and the control side; and the power supply module is used for supplying power to each module. According to the utility model, the isolation module and the TC input module are added, signals of a field end and a control end can be effectively isolated, the influence of ESD, surge and pulse on the device is effectively reduced, the design of an analog filter circuit, independent cold end measurement and the like is added, the external interference of the system is reduced, and the design of bias voltage is added to realize thermocouple short-line self-diagnosis. Through the design, the reliability and the measurement precision are improved.

The invention provides a virtual synchronization mechanism network type control method, system and device based on flux linkage synchronization control and a medium, and the method comprises the steps: obtaining a three-phase AC voltage reference value based on the grid-connected point output data of a network type inverter through employing a virtual synchronization machine control strategy; based on the three-phase alternating current flux linkage measurement value, synchronous feedback correction is carried out on the three-phase alternating current voltage reference value, a PWM modulation input signal is obtained, and a trigger pulse is generated to carry out synchronous control on the network-forming inverter; according to the method, a virtual synchronous machine control strategy is combined with flux linkage synchronous control, and a three-phase alternating-current voltage reference value is subjected to synchronous feedback correction by utilizing a three-phase alternating-current flux linkage measurement value before PWM (Pulse-Width Modulation) modulation, so that synchronous control is performed on the grid-forming type inverter, the deceleration area of a transient power angle curve of the grid-forming type inverter can be increased, and the stability of the grid-forming type inverter is improved. Therefore, the limit clearing time of the grid-forming inverter is prolonged, and the transient stability and the large disturbance fault resistance of the grid-type inverter of the virtual synchronization mechanism are improved.

There are provided display controllers and driving methods related to those described in US Published Patent Application No. 2013 / 0194250. These include (a) a display controller having an update buffer, means for removing from the update buffer pixels not requiring updating, and means to ensure that pixels having certain special states are not removed from the update buffer; (b) a method of driving a bistable display wherein, in a pixel undergoing a white-to-white transition and lying adjacent another pixel undergoing a visible transition, there is applied to the pixel one or more balanced pulse pairs and at least one top-off pulse; (c) a method of driving a bistable display by overlaying a non-rectangular item over a pre-existing image content and then removing the item, where only pixels in the region of the item perform transitions (including self-transitions); and (d) a method of driving a bistable display in which a proportion of background pixels not undergoing an optical change are subjected to a refresh pulse to correct optical state drift.

The invention provides an oscillation signal energy detection circuit and an isolator, two paths of received oscillation signals with a difference of half a cycle are used as clock signals through a first trigger and a second trigger, charge and discharge current of a capacitor is controlled by alternately turning on and turning off a third switch, the charge current of the capacitor is greater than the discharge current, and the discharge current of the capacitor is greater than the discharge current. Energy accumulation can be achieved through continuous switching actions, signal overturning is completed when the voltage obtained through energy accumulation exceeds a set threshold value, and energy detection is achieved. The anti-interference capability and the transient common mode rejection capability of the signal are improved by detecting the energy corresponding to the number of the pulses of the continuous oscillation signal, high and low levels are judged by taking the accumulated energy corresponding to the N continuous pulses as a reference, the propagation delay and the distortion degree of the signal are reduced, and the problem that the anti-interference capability of single-channel isolation transmission is insufficient is solved.

The present application provides a display device, which includes a display panel, a gate driver, and an emission driver. In a first duration corresponding to a writing frame and each holding frame, a ratio of number of periods of a light-emitting control signal to a first duration is greater than a critical flicker frequency. A valid pulse of the first scan signal corresponds to an invalid pulse of the light-emitting control signal, and a valid pulse of the second scan signal is located within a duration of the invalid pulse in the first period of the light-emitting control signal corresponding to the writing frame.

The invention provides a lightning stroke current waveform monitoring method and device, electronic equipment and a storage medium, and belongs to the technical field of lightning monitoring. According to the lightning stroke current waveform monitoring method provided by the embodiment of the invention, the broadband, high-sensitivity and wide-range current sensor is adopted, so that lightning stroke current waveform signals in different frequency ranges from approximate direct current to dozens of MHz can be sensed and accurately recorded; a high-precision time service method based on Beidou and GPS dual-mode pulse per second alignment and high-stability crystal oscillator counting is utilized to realize high-precision synchronization of lightning stroke time, and a multi-parameter waveform parameter extraction method is adopted to automatically calculate important parameters such as a waveform peak value, polarity, rising edge time, wave head gradient, charge quantity and specific energy. The technical problem of poor comprehensiveness and accuracy of lightning stroke current detection in the prior art can be effectively solved.

The invention provides a phase state interference performance measuring device and method, and mainly relates to the technical field of quantum information. The measuring device comprises a pulse preparation module which is configured to generate an optical pulse pair at a preset frequency; the unequal arm interferometer is configured to perform interference processing on the light pulse pairs based on the long and short arm delay difference to obtain interference pulse signals and non-interference pulse signals corresponding to each light pulse pair; the measuring module is configured to measure the interference pulse signals and the non-interference pulse signals corresponding to the multiple optical pulse pairs respectively to obtain detection responses of the multiple interference pulse signals and detection responses of the multiple non-interference pulse signals; and a data processing module configured to determine response counts of interference peak positions and response counts of non-interference peak positions in a plurality of sampling periods based on the detection responses of the plurality of interference pulse signals and the detection responses of the plurality of non-interference pulse signals so as to obtain a phase state interference result and a phase state non-interference result.

The invention discloses a frequency agility radar signal sorting and individual clustering method combining inter-pulse and intra-pulse characteristics. The method comprises the following steps: screening an original pulse stream to obtain a screened pulse stream; performing frequency domain filtering on the intermediate frequency data corresponding to each pulse after screening to obtain corresponding intermediate frequency filtering data, and performing down-conversion on the intermediate frequency filtering data of all the pulses after screening to the same frequency to obtain preprocessed intermediate frequency data of each pulse after screening; sorting all pulses corresponding to the preprocessed intermediate frequency data based on the pulse description word of each type of radar to obtain a cluster of the corresponding type of radar; based on an intra-pulse fingerprint feature extraction mode, extracting a fingerprint feature vector corresponding to each cluster after sorting; and clustering the fingerprint feature vectors based on an FCM clustering algorithm of a joint parameter optimization K value to obtain an individual clustering result of the radar of the corresponding model. According to the invention, more accurate radar individual clustering can be realized.