143 results about "Pulse transmission" patented technology

The invention provides a power distribution network line fault testing and positioning method based on optical fiber pulse transmission, and relates to the technical field of power distribution networks, and the method comprises the steps: obtaining a phase voltage signal, a phase current signal and an optical fiber transmission signal of a power distribution network line, and judging a fault through wavelet transformation; when a fault exists, probe light is generated by using a narrow linewidth laser, a scattering signal is obtained after modulation of a Bragg grating array, and gain adjustment and coherent demodulation are performed on the scattering signal to determine a mutation point; based on the catastrophe point, a reflection signal is obtained through bidirectional reflection measurement, and the fault position is determined through combination of a group velocity dispersion equation and self-adaptive multi-stage dispersion compensation. Through photoelectric joint detection and multi-stage signal processing, the accuracy of fault positioning is improved, rapid and accurate positioning of the power distribution network fault is realized, and the method has relatively strong anti-interference capability and environmental adaptability.

The invention discloses an optical fiber winding detection method and device, and the method comprises the steps: obtaining an optical pulse transmission signal transmitted by an optical time domain reflectometer to a to-be-detected optical fiber, and receiving a reflected optical pulse reflection signal; respectively carrying out signal waveform feature extraction on the optical pulse transmission signal and the optical pulse reflection signal to obtain a transmission signal waveform semantic feature map and a reflection signal waveform semantic feature map; processing the transmitted signal waveform semantic feature map and the reflected signal waveform semantic feature map to obtain a transmitted signal waveform semantic saliency feature map and a reflected signal waveform semantic saliency feature map; performing nonlinear correlation interaction processing on the transmitted signal waveform semantic saliency feature map and the reflected signal waveform semantic saliency feature map to obtain a transmitted signal-reflected signal waveform semantic correlation feature map; the classifier outputs an optical fiber winding identification result according to the transmitted signal-reflected signal waveform semantic association feature map; the method can improve the accuracy of optical fiber winding identification.

The embodiment of the invention provides a pipeline blockage monitoring method and system for wet metallurgy slurry conveying, and belongs to the technical field of pressure measurement and pipeline blockage monitoring. The method comprises the following steps: collecting multi-point pressure signals along a slurry pipeline, and extracting pressure pulsation amplitudes and phase characteristics in a pump fundamental frequency and frequency multiplication range based on the multi-point pressure signals so as to establish an on-way pulsation transmission sequence; determining equivalent on-way impedance based on comparison between the on-way pulse transmission sequence and a reference working condition, and outputting an initial judgment result for representing a blockage risk; flow temperature and viscosity estimation parameters are introduced based on the initial judgment result to carry out rheological correction on an impedance threshold value, and a high-frequency phase difference is extracted at an elbow section to update a candidate blockage position; and based on the updated candidate blockage position and the corrected impedance threshold, fusing a phase stability index, and generating and outputting a current blockage evaluation result. According to the scheme, early-stage accurate positioning and stable judgment of slurry pipeline blockage can be achieved under complex working conditions.

An azimuth ambiguity suppression method for a spaceborne SAR in spatially non-uniform sampling relates to the technical field of radars. The method includes the following steps: step 1: compensating for a phase difference between the channels according to the locations of transmitting and receiving stations for channel echoes; step 2: calculating an equivalent azimuth sampling location of each channel at the moment of each pulse transmission; step 3: sorting the equivalent azimuth sampling locations of all channels and their corresponding echoes after the phase difference between the channels is compensated in ascending order; and step 4: calculating reconstructed echoes from the sorted equivalent azimuth sampling locations and corresponding echoes after the phase difference between the channels is compensated, by using an adaptive weight-conjugate gradient-Toeplitz matrix (ACT) algorithm. According to the present disclosure, a relative distance between the channels is not required to remain unchanged, which greatly expands the scope of application of azimuth multi-channel SAR echo reconstruction.

The embodiment of the invention provides a time-space reference synchronization method and device for a multi-satellite cooperative task, and the method achieves the precise time synchronization of a multi-satellite system through constructing a verification system which comprises a pulse per second controller, a simulation industrial control computer and a verification server, and building a pulse transmission time delay compensation model. A multi-source navigation information fusion algorithm is innovatively designed to obtain high-precision space-time reference data, and a preset data frame format is adopted for unified broadcasting. According to the system, a complete dynamic model considering non-spherical gravitational perturbation, sun-moon gravitational force, atmospheric resistance and light pressure effects is established, accurate updating and synchronous broadcasting of the relative motion state of multiple satellites are achieved in combination with a torque parameter conversion mechanism of a control instruction, and a reliable cooperative control verification scheme is provided for complex space tasks.

The invention discloses a multi-channel high-precision time sequence pulse transmitting system, and the system comprises a control panel which comprises a command receiving control unit and a time sequence generation unit; the command receiving control unit is configured to receive a control command and analyze the control command into pulse basic information; the time sequence generation unit is configured to receive the pulse basic information, generate a coarse delay pulse signal according to the pulse basic information, and generate a driving signal; the daughter board comprises a pulse precise delay unit and an optical port output unit; the pulse fine delay unit is configured to receive the driving signal, perform fine delay adjustment on the coarse delay pulse signal and generate a time pulse sequence; the optical port output unit is configured to receive the time pulse sequence and convert the time pulse sequence into an optical signal. The delay precision of the system can be effectively improved.

The invention provides an optical signal synchronous calibration device and method of an optical computing system. The device comprises an optical probe array, an AI coprocessor, an optical path tuning engine and a low-speed electric feedback line, wherein the optical probe array is arranged on a chip; the optical probe array detects optical signals of wavelength channels corresponding to the plurality of optical calculation units and converts the optical signals into electric signals; the AI coprocessor drives a corresponding optical calculation unit to emit a detection pulse according to a pre-distributed time slot index variable, extracts a phase error from the electric signal and calculates a final calibration amount based on the phase error; the optical path tuning engine performs an optical path tuning operation based on the final calibration amount to calibrate an error of the corresponding optical calculation unit; and the low-speed electric feedback line transmits the electric signal to the AI coprocessor and transmits the detection pulse to the chip. According to the invention, through cooperation of spatial distributed detection and board-level centralized processing, real-time calibration in a dynamic environment is realized.

The invention discloses a near-bit formation resistivity imaging system and method. The near-bit resistivity imaging and wireless signal transmitting short section performs multi-sector resistivity measurement under at least one depth of a near bit and encoding and transmitting of wireless short transmission electromagnetic wave signals through a resistivity button electrode array; the wireless signal receiving short section receives the cross-screw wireless short transmission electromagnetic wave signal and decodes and transmits the cross-screw wireless short transmission electromagnetic wave signal to the slurry pulse transmission short section; the mud pulse transmission short section is used for coding resistivity measurement data and transmitting the resistivity measurement data to a ground system in a mud pulse manner; and the ground system receives, decodes, displays and images the mud pulse signals. According to the technical scheme, near-bit resistivity imaging of different depths is achieved in the drilling process, real-time measurement, uploading and display of resistivity imaging data are achieved in the mode of cross-screw wireless electromagnetic wave short transmission and mud pulse combined transmission, refined geosteering under the complex geological condition is assisted, and the drilling efficiency is improved. And a technical support is provided for improving the drilling rate of oil and gas reservoirs.

The invention discloses an efficient deployment method and device of an artificial neural network facing a brain-like chip. The efficient deployment method comprises the steps of pulse transmission between layers of the quantized artificial neural network, sparse coding of pulses and compatibility design based on the storage function of the brain-like chip. Generally, a network running on a brain-like chip is a spiking neural network, and the method is a brand-new method. The method comprises the following steps of: pulsing a quantized artificial neural network activation value so that the converted network can be subjected to high-precision and low-delay reasoning; according to the method, a neuron behavior equivalent to quantitative reasoning of an artificial neural network is provided, the network is successfully deployed on a brain-like chip, and discreteness of the quantitative network and event-driven characteristics of the brain-like chip are combined; in addition, limited by the precision of different hardware, the invention provides a method for scaling an operation intermediate result to avoid an overflow risk.

The invention discloses a bipolar high-voltage pulse driving circuit and driving method of an air coupling ultrasonic transducer, the driving circuit comprises a control circuit, an auxiliary power supply circuit, a pulse transmitting unit and a high-voltage output unit, and the high-voltage output unit comprises a high-frequency inverter circuit, a high-frequency transformer T1 and a voltage doubling rectifying circuit. According to the bipolar high-voltage pulse driving circuit and the driving method, a bipolar high-voltage controllable excitation signal can be generated while the high-voltage driving requirement of the ultrasonic transducer is met by only one low-voltage power supply, and the received ultrasonic energy is remarkably improved.

The invention relates to the technical field of ultra-deep geological exploration engineering, and discloses an ultra-deep horizontal hole full-hole coring and trajectory cooperative control system, which integrates a high-precision sensor and professional monitoring equipment through a geological data acquisition module to construct a multi-dimensional data monitoring system; the geological data transmission module adopts a dual backup scheme of drill rod built-in optical fiber and mud pulse transmission, is connected with the geological data acquisition module and the geological data analysis module through an industrial Ethernet, is carried with a 5G industrial module, and supports remote data access and instruction interaction of each functional module; the geological data analysis module comprises a processing unit and an analysis unit, the processing unit preprocesses the acquired data, and the analysis unit extracts the preprocessed data to calculate a trajectory deviation value and a rock core recovery rate; and the decision feedback module sends out feedback processing according to the calculation results of the trajectory deviation value and the core recovery rate. The system solves the problem of insufficient accuracy of traditional track evaluation.

The present invention relates to a device, system and method for calibrating a blood pressure, BP, surrogate for use in monitoring a subject's blood pressure. The device comprises a BP input (51), a sensor input (52) and a processing unit (53) that is configured to compute, during inflation of the cuff, pulse-related values from the first and second time-dependent sensor signals using a first feature in the first time-dependent sensor signal and a second feature in the second time-dependent sensor signal, the pulse-related values being pulse arrival time, PAT, values or pulse transit time, PTT, values, selecting pairs of pulse-related values and corresponding cuff pressure values for computing a calibration parameter for a BP surrogate, a pair comprising a pulse-related value and a corresponding, temporally related cuff pressure value, wherein only pairs of pulse-related values and corresponding cuff pressure values are selected for which one or more predetermined conditions with respect to BP and / or cuff pressure are fulfilled, and computing a calibration parameter for a BP surrogate from the BP measurement value and the selected pairs of pulse-related values and corresponding cuff pressure values.

A temperature insensitive oscillator system. The system includes a substrate having a first surface and an opposing second surface, a CMOS device with one or more CMOS circuits attached to the first surface of the substrate, one or more piezoelectric transducers attached to an outer surface of the CMOS device, a voltage-controlled oscillator generating a RF frequency, which is transmitted as a plurality of short pulses to the one or more piezoelectric transducers, and one or more delays and oscillators using resistor and active components arranged alongside the piezoelectric transducers or on the CMOS device such that the voltage-controlled oscillator has minimal dependence on temperature, and has minimal deviation from a programmed frequency. In order to meet the requirement of low phase noise and high clock frequencies, a very quality factor resonator-based oscillator is phase locked with the BAW wave based oscillator to realize both an accurate and low-phase noise oscillator.

A method and apparatus for predicting blood pressure, an electronic device, and a readable storage medium, relating to the technical field of medical treatment. The method for predicting blood pressure comprises: synchronously acquiring physiological signals, wherein the physiological signals comprise an electrocardiographic signal, a pulse signal, and a heart sound signal; performing feature extraction on the physiological signals to obtain signal features, wherein the signal features comprise an pre-ejection period duration and a pulse transmission time; and inputting the signal features into a pre-trained blood pressure prediction model, so that the blood pressure prediction model outputs a blood pressure prediction result, thereby improving the prediction accuracy of blood pressure.

The present disclosure describes ultrasound systems and methods configured to interrogate the stiffness and / or elasticity of a target tissue through shear wave imaging. The systems can be configured to transmit multiple push pulses at different focal depths in the target tissue in a strobe-like fashion. The rapidly transmitted push pulses can generate constructive interference to form shear waves of a composite shear wave. An example system can include a beamformer configured to transmit parameters of a push pulse to a transducer array while receiving new parameters of a push pulse from a controller. The dual transmission and reception of parameters of different push pulses reconfigures the beamformer without interrupting push pulse transmission, thereby minimizing the delay between successive push pulses. The push pulses transmitted according to the disclosed methods can generate a composite shear wave configured to interrogate the tissue with enhanced sensitivity over a wide range of depths.

A pulse transmission circuit is incorporated in a signal transmission device employing a capacitive insulation method, and configured to cause a transmission pulse signal, which is transmitted to a capacitor of a subsequent stage, to make a gradual logic-level transition when a logic level of an input pulse signal switches. For example, the pulse transmission circuit may be configured to trigger the transmission pulse signal a plurality of times, while causing the transmission pulse signal to make a gradual logic-level transition, so as to repeat raising and lowering of the transmission pulse signal.

This invention discloses an intelligent psychological guidance system for harmonizing the Qi of the internal organs based on TCM emotional differentiation, belonging to the field of medical electronic equipment. The system includes a multi-node physiological signal acquisition module, a central control and data processing module, and an acoustic intervention output module. The system synchronously acquires multi-channel bioimpedance, volumetric pulse wave, and electrocardiogram signals, extracts pulse wave conduction time and local blood perfusion index, constructs Qi characteristic parameters, and maps them to generate emotional tags. The central control module locks the target resonance unlocking frequency according to the tags, modulates low-frequency vibrations with reference audio to synthesize a multimodal signal, and further combines physiological pulse transmission delay to perform phase compensation, controlling the precise output of the intervention signal during ventricular diastole. Steady-state determination and closed-loop tracking are performed based on the dynamic gradient of impedance variance. This invention achieves objective quantification of TCM differentiation and ensures high-precision physical alignment between intervention energy and the hemodynamic state of the internal organs.

The application belongs to the technical field of photon imaging detection, and particularly relates to a photon counting imaging detection system based on a mixed anode. The system comprises a vacuum sealed tube detector composed of a window coated with a photocathode, a microchannel plate stack and a mixed anode, and a signal processing circuit. The photocathode is used for converting photons incident through the window into photoelectrons. The microchannel plate stack is used for converting the photoelectrons into electron clouds. The mixed anode comprises a strip anode and a delay line anode arranged orthogonally, and the mixed anode transmits the collected charge short pulses of each channel to the signal processing circuit. The signal processing circuit calculates the two-dimensional coordinates of the photons based on the collected charge short pulses of each channel, and then transmits the two-dimensional coordinates of the photons to a terminal for imaging display. The application provides a photon counting imaging detection system based on a cross strip-delay line mixed anode, and solves the problem that the existing position sensitive anode detector cannot simultaneously have high spatial resolution and high temporal resolution.

The utility model relates to the technical field of medical equipment, and particularly discloses a bipolar nanosecond pulse synchronous output circuit and ablation equipment, which comprise a positive pulse output circuit and a negative pulse output circuit, the positive pulse output circuit comprises a positive pulse charging unit, a positive pulse output control unit, a positive pulse transmission unit and a positive pulse output electrode wire which are electrically connected in sequence; the negative pulse output circuit comprises a negative pulse charging unit, a negative pulse output control unit, a negative pulse transmission unit and a negative pulse output electrode wire which are electrically connected in sequence; the positive pulse transmission unit at least comprises a forward multiplication transmission unit which is used for performing forward voltage multiplication or forward current multiplication on the forward output pulse signal; the negative pulse transmission unit at least comprises a negative multiplication transmission unit which is used for carrying out negative voltage multiplication or negative current multiplication on the negative output pulse signal. The bipolar nanosecond pulse synchronous output circuit provided by the utility model can improve instant pulse energy of nanosecond pulse tumor ablation equipment.

Ultra-Wideband (UWB) wireless technology transmits digital data as modulated coded impulses over a very wide frequency spectrum with very low power over a short distance. Accordingly, the inventors have established UWB devices which accommodate and adapt to inaccuracies, errors, or issues within the implemented electronics, hardware, firmware, and software. Beneficially, UWB receivers may accommodate offsets in absolute frequency between their frequency source and the transmitter, accommodate drift arising from phase locked loop and / or from relative clock frequency offsets of the remote transmitter and local receiver. UWB devices may also employ modulation coding schemes offering increased efficiency with respect to power, data bits per pulse transmitted, and enabled operation at higher output power whilst complying with regulatory emission requirements. Further, UWB devices may support a ranging function with range / accuracy not limited to the low frequency master clock employed within these devices enabling operation with ultra-low power consumption.

To increase the number of reception beams generated by phasing addition in an ultrasonic diagnostic apparatus for generating a shear wave by exciting a tissue by a vibrator array and tracking the shear wave with the vibrator array.SOLUTION: In conventional processing shown in a chart group 504, phasing processing for generating a large number of reception parallel beams is performed in a period of the length similar to a period of the length for writing data on a reception signal for track pulses a large number of times in a CH (channel) memory. Contrary to this, in the processing shown in a chart group 506, a period for phasing processing is made longer by using not only the writing period to the CH memory, but also a vacant period NopA for charging required for push pulse transmission, and a vacant period NopB for cooling a probe. Thereby, the number of reception beams that can be generated in the period of phasing processing can be made larger than in the conventional processing.SELECTED DRAWING: Figure 2

This disclosure is directed to devices, systems, and techniques for monitoring a patient condition. In some examples, a medical device system includes processing circuitry configured to determine a plurality of pulse transit time (PTT) intervals, determine, based on an accelerometer signal, a posture of a patient from a plurality of postures corresponding to each PTT interval of the plurality of PTT intervals, classify each PTT interval of the plurality of PTT intervals based on the respective posture of the patient corresponding to the respective PTT interval, and monitor, based on the classified plurality of PTT intervals, a patient condition.

The embodiment of the invention relates to the field of communication, in particular to a multi-CPU cooperation system, method and device based on an FPGA and a medium, the system comprises a plurality of PCIe adapter cards formed based on the FPGA and a plurality of CPUs, and each PCIe adapter card at least comprises a PCIe interface, a plurality of high-speed optical ports, a synchronization pulse sending interface and a synchronization pulse receiving interface; wherein the first PCIe adapter card in the plurality of PCIe adapter cards is connected with the first CPU, and is connected with the second high-speed optical port of the second PCIe adapter card through the first high-speed optical port; the second PCIe adapter card is used for being connected with a second CPU through a second PCIe interface; and the first CPU and the second CPU perform time synchronization of a processing task according to the synchronization pulse signal. According to the scheme, the performance of each CPU in a multi-CPU cooperative working process can be ensured, and high-bandwidth, low-delay and low-jitter real-time interaction among the plurality of CPUs is realized.

The application provides an optical signal synchronous calibration device and method of an optical computing system, the device comprising: an optical probe array arranged on a chip, an AI coprocessor, an optical path tuning engine and a low-speed electrical feedback line arranged on a board card; the optical probe array detects optical signals of wavelength channels corresponding to a plurality of optical computing units and converts the optical signals into electrical signals; the AI coprocessor drives the corresponding optical computing unit to emit a detection pulse according to a pre-allocated time slot index variable, extracts a phase error from the electrical signal and calculates a final calibration quantity based on the phase error; the optical path tuning engine performs an optical path tuning operation based on the final calibration quantity to calibrate the error of the corresponding optical computing unit; and the low-speed electrical feedback line transmits the electrical signal to the AI coprocessor and transmits the detection pulse to the chip. The application realizes real-time calibration in a dynamic environment through spatial distributed detection and board-level centralized processing cooperation.

The invention discloses a constant-temperature crystal oscillator time keeping system dynamic compensation system and method, is used for solving the technical problems that an existing constant-temperature crystal oscillator compensation circuit is complex, high in cost and large in size and needs long taming time, and belongs to the technical field of time synchronization. A satellite time service module transmits a time message to a message analysis module, and a constant-temperature crystal oscillator transmits a high-stability clock signal to a clock management module; the clock management module carries out frequency multiplication on a clock signal and then transmits the clock signal to the main control module; the main control module obtains and stores the signals in a reverse compensation coefficient ROM through the difference calculation module, the main control module generates and stores the signals in a dynamic compensation coefficient ROM according to a set duration counting module, and the satellite time service module transmits the signals to the delay module; after counting of the time delay module is finished, processed signals are transmitted to the time keeping module through the set duration counting module and the division operation module, and the time keeping module calls the dynamic compensation coefficient and the reverse compensation coefficient through the compensation module for compensation to obtain the compensated DPPS.

The invention discloses a gating framing imaging dynamic gain uniformity simulation method, and relates to the technical field of ultrafast diagnosis. According to the method, an MCP microstrip cathode physical model containing a material loss angle tangent value is constructed, a gating pulse is set in electromagnetic simulation software to serve as an excitation source, and direct geometric modeling of massive micro-channel holes is equivalently replaced by adjusting the material loss angle tangent value so as to simulate energy attenuation in the gating pulse transmission process; after pulse amplitudes at different transmission distances are obtained, dynamic gain distribution in the pulse transmission direction is calculated by combining the power relation between MCP gain and working voltage. According to the method, fine geometric modeling does not need to be carried out on the MCP micro-channel hole, the computing resource requirement and simulation time are greatly reduced, the dynamic gain uniformity of the MCP can be accurately and efficiently evaluated, and the method can be popularized and applied to design and performance verification of other MCP-based high space-time resolution detectors.

The invention discloses an electromagnetic disturbance simulation test method, system, equipment and medium in an extreme multi-physical environment, and belongs to the technical field of electric power engineering and measurement testing, and the method comprises the steps: electrifying a test device, obtaining extreme multi-physical environment data, generating multiple groups of test conditions, and setting test points; setting the voltage of a high-voltage source, setting an acquisition mode and a trigger value of an oscilloscope, controlling the switching frequency of a pulse transmission line to be adjusted and applied to a to-be-detected electronic transformer, drawing an I-V curve of the electronic transformer according to an acquisition result, and combining the I-V curves of the electronic transformer under multiple groups of temperature and humidity conditions, and analyzing to obtain the failure voltage and the failure current of the electronic transformer. According to the method, the performance data of the electronic mutual inductor under different temperature and humidity conditions and electromagnetic disturbance environments are comprehensively and accurately collected, the data can be deeply analyzed through a scientific and reasonable data processing method and a strict failure judgment criterion, and the performance and reliability of electronic equipment are accurately evaluated.

A visualization system (106) with customizable illumination cycles for addressing relative brightness differences between different illumination sources. A system includes an image sensor (124) including an array of pixels (125) and a transmitter (102) including a plurality of electromagnetic radiation sources (138), wherein the plurality of electromagnetic radiation sources includes a first source and a second source. The transmitter cycles at least a portion of the plurality of electromagnetic radiation sources according to a pulse period including a plurality of pulse emissions by the first source and a plurality of pulse emissions by the second source. When the image sensor reads out a data frame corresponding to the transmission of the first source, at least a portion of the plurality of pulsed transmissions of the second source overlaps a readout period of the image sensor.

The invention discloses a second pulse detection protection circuit, system and method and a vehicle. The second pulse detection protection circuit comprises a second pulse transmission module, an input signal detection module and an output signal detection module. The second pulse transmission module outputs a second pulse signal, the input signal detection module outputs a second pulse sampling signal I, the input end of the output signal detection module is connected with the output end of the second pulse transmission module, and the output signal detection module outputs a second pulse sampling signal II; the positioning module is used for judging whether to generate the second pulse signal based on the second pulse sampling signal I and selecting to generate the second pulse signal, and judging whether to stop generating the second pulse signal and whether to output the second pulse signal based on the second pulse sampling signal I and the second pulse sampling signal II. According to the invention, accurate second pulse signals can be obtained in real time.

Described are optical magnetic recording systems, writers, media, and methods that utilize pulses of electromagnetic radiation to deterministically record information on magnetic storage media unaided by any additionally applied magnetic field such as from a write pole. The recording pulses may be linearly (or longitudinally) polarized pulses or circularly polarized pulses. The pulses may be modulated in accordance with data bits to be written on the media. Modulation may include modulating the polarization state(s) of the pulses and / or modulating the amplitude(s) the pulses, depending on the particular construction or configuration of the magnetic storage media to be used. Described are recording systems and methods that include laser light pulse generation, light pulse modulation, light pulse delivery, and magnetic media constructions.