17 results about "Pulse envelope" patented technology

The invention relates to the technical field of radars, in particular to a weather radar distance resolution calibration method and system. The method comprises the following steps: collecting oversampling original baseband I / Q data of a point target in a plurality of continuous pulse periods; determining a pulse signal-to-noise ratio, and screening out effective pulses according to a threshold value; carrying out sub-sampling stage time alignment on the effective pulses based on cross-correlation analysis, and carrying out incoherent averaging on power module values of all the aligned pulses to generate an average pulse power envelope; converting the average pulse power envelope to a logarithm domain, and selecting discrete data points in a main lobe region; according to the discrete data points, a nonlinear least square method is adopted to carry out iterative fitting on the generalized Gaussian mathematical model, and a continuous analytic function describing the pulse envelope is obtained; according to the continuous analytic function, determining a pulse time width when the power is reduced to a peak value of-6dB; and determining the real distance resolution according to the pulse time width. The measurement robustness is improved, and sub-meter calibration precision is achieved.

The present application relates to the technical field of mechanical fault diagnosis, and particularly relates to an engine main bearing quantitative diagnosis method based on adaptive filtering and impact enhancement; comprising the following steps: S1, using a pulse mode decomposition method, carrying out pulse mode extraction, and obtaining a residual signal of the extracted pulse mode; comprising the following steps: S11, assuming a pulse mode, obtaining a pulse mode sparsity quantitative index of the pulse mode; S12, constructing an adaptive filter set, extracting the pulse mode according to the adaptive filter set, and thus obtaining a residual signal; S2, based on the residual signal obtained in step S1, reconstructing a signal of a signal collected by the engine main bearing, and obtaining a reconstructed pulse envelope; S3, according to the pulse envelope, obtaining a standard decibel of the impact pulse value, and according to the standard decibel, evaluating the health state of the main bearing; the effectiveness of the diagnosis of the aero-engine main bearing is improved.

The present application relates to the field of radar technology, especially to a weather radar range resolution calibration method and system. The method comprises the following steps: collecting oversampling original baseband I / Q data of a point target in multiple pulse periods; determining pulse signal-to-noise ratio, and screening effective pulses according to a threshold value; performing time alignment of the effective pulses in a sub-sampling stage based on cross-correlation analysis, performing non-coherent average of power modulus of all the aligned pulses, and generating an average pulse power envelope; converting the average pulse power envelope to a logarithmic domain, and selecting discrete data points located in a main lobe region; using a nonlinear least squares method to iteratively fit a generalized super-Gaussian mathematical model according to the discrete data points, and obtaining a continuous analytical function describing the pulse envelope; determining a pulse time width at which the power drops to a peak value-6dB according to the continuous analytical function; and determining a real range resolution according to the pulse time width. The measurement robustness is improved, and the calibration accuracy is sub-meter.

The application discloses a kind of based on time-frequency chart's graph signal detection method, terminal equipment and storage medium, the method includes the following steps: obtaining signal time-frequency chart, Fourier transform is carried out after filtering and binarization to it in time direction, the maximum value position of each column is counted and clustered, and the class with bandwidth is too narrow and the column discontinuous in class is removed;The corresponding column of each class is summed in frequency direction to obtain pulse envelope, and then the start and end column of the pulse spectrum envelope corresponding to each class is obtained, which is compared with the start and end column of each class after clustering, to find the class with the smallest error;Iterate until the error of current calculation result and previous calculation result tends to be stable, then determine the frequency band of stable result, that is, whether the signal is the target signal can be judged.The application is applied to communication technology and electronic countermeasure field, not only less calculation, and high-precision detection can be carried out on graph signal under low signal-to-noise ratio condition, but also can filter out part of interference signal, false alarm rate is lower.

The invention provides an efficient ozone generation system based on pulse modulation surface dielectric barrier discharge, which mainly comprises a power supply module, a pulse modulation module, a surface dielectric barrier discharge chamber, a spectral measurement module, a computer, an oscilloscope, a voltage probe, an air source, a gas flow control module and a mercury lamp light source, all the modules form a complete ozone generation and detection system through circuits, light paths and gas paths, so that efficient generation and real-time monitoring of ozone and intelligent regulation and control of parameters are realized. Through a double-layer modulation structure of'high-frequency continuous discharge + low-frequency pulse envelope ', electron energy enhancement and heat input decoupling are realized, so that the oxygen molecule dissociation efficiency is obviously improved, and the ozone concentration is obviously improved. The system can automatically adjust the pulse duty ratio and low-frequency modulation parameters according to temperature and humidity changes, inhibit temperature rise and compensate the influence of humidity on ozone generation, so that the stability of ozone concentration under different environmental conditions is ensured.

The application relates to a new GNSS fast sweep frequency interference suppression method. The method comprises the following steps: acquiring a sampling data sequence of a satellite navigation receiving device, adopting a pre-set low-pass filter to perform low-pass filtering on the sampling data sequence to obtain output data; adopting a conjugate operation mode to acquire an envelope value of the output data to obtain pulse envelope data; according to a characteristic value in the pulse envelope data, an interference detection threshold is calculated; according to the interference detection threshold and a pulse detection zeroing scheme, interference suppression is performed on the pulse envelope data to obtain interference suppression data. The method has low operation complexity.

The invention discloses an inverter narrow pulse compensation method, system and device and a storage medium, and relates to the technical field of power electronics and inverter control, and the method comprises the steps: collecting narrow pulse multi-source data through a collection part, inputting the narrow pulse multi-source data into a fitting part, and outputting a blocking pulse feature set; inputting the blockade pulse feature set into a calculation part, outputting the number of times and the distribution mode of the compensation pulse, and storing the number and the distribution mode into a compensation part; the blockade pulse feature set is obtained through adaptive polynomial fitting of blockade narrow pulse envelope; the frequency of the compensation pulse is obtained through the pulse width and a preset threshold value; the output distribution mode is obtained through enveloping and least square; the number of times of the compensation pulses stored in the compensation unit and the distribution mode are superimposed and executed at the same position in the next cycle. The method provided by the invention has better effects in the aspects of completeness of blocking pulse characterization, computability of compensation times and distribution modes and cycle consistency of compensation execution.

The application discloses a kind of nuclear magnetic resonance pulse data's framing method, framing ware and nuclear magnetic resonance spectrometer, it is related to nuclear magnetic resonance technical field.Framing method includes: obtaining the nuclear magnetic resonance pulse data to be framed;Using fixed length coding mode, according to the data type of nuclear magnetic resonance pulse data to be framed, nuclear magnetic resonance pulse data to be framed is framed into independent event frame, or framed into the shaping envelope data frame different from event frame structure, wherein, event frame includes at least one of emission event frame, receiving event frame and delay event frame.Thereby, the FPGAs parsing complex, timing deviation problem caused by variable length framing in the prior art can be overcome, while solving the defect that envelope data cannot be reused and frame data volume is large caused by selective pulse envelope data and emission instruction mixed coding, so as to reduce the complexity of transceiver processing, improve the stability and flexibility of nuclear magnetic resonance detection.

The application is based on an X-band power amplifier system of an eight-port radio frequency pulse amplitude control microstrip network, which is composed of a power amplifier driving and sampling comparison module, an eight-port radio frequency pulse amplitude control microstrip network module, a power amplifier module and a power amplifier control and power supply module; a linear frequency modulation pulse signal generated by a radar transmitter is input to the power amplifier driving and sampling comparison module, is amplified by the power amplifier module again through the eight-port radio frequency pulse amplitude control microstrip network module and is output; the power amplifier control and power supply module controls and supplies power to the whole system. The application embeds an eight-port radio frequency pulse amplitude control microstrip network in a radar power amplifier system, directly controls the amplitude of a radar radio frequency pulse envelope signal in a solid-state power amplifier, reduces the sidelobe amplitude of a pulse compression signal in a final receiver, improves the detection ability of a small target and the display effect of a radar echo, and reduces the cost and design complexity of a radar transmitter.

The application belongs to the technical field of partial discharge detection of power equipment, and specifically discloses a neural network partial discharge identification method fusing a polarization particle swarm optimization. The application adopts a structure parameter particle swarm and a threshold parameter particle swarm to group and cooperatively optimize scale parameters, translation parameters and unified soft thresholds of a wavelet kernel function, and takes a no-reference fitness function composed of pulse energy concentration and pulse envelope form retention as a target to realize the balance between the partial discharge pulse feature retention and the noise suppression under the condition of lacking a noise-free reference signal, and improves the image construction quality. Meanwhile, the application designs a residual neural network fusing a multi-path feature enhancement, a learnable local texture attention module and a light-weight selection kernel attention module, which can simultaneously model the local texture, edge transition, multi-scale structure and global distribution of the image, improve the discrimination ability and generalization performance of the network on the partial discharge image, and guarantee the accuracy and robustness of the identification.

A method for generating an ultra-wideband signal is provided. The method comprises the steps of generating at least one ultra-wideband pulse envelope comprising a main pulse and a precursor pulse, the precursor pulse being shorter in length and lower in amplitude compared to the main pulse, and modulating a carrier signal in amplitude such that the envelope corresponds to the at least one ultra-wideband pulse envelope and such that the carrier signal within the main pulse is phase-shifted with respect to the carrier signal within the precursor pulse.

The invention belongs to the technical field of radio frequency power supply detection, and discloses a semiconductor radio frequency power supply pulse detection method, device and equipment and a medium, and the method comprises the steps: obtaining a radio frequency power supply forward power signal and a radio frequency power supply reflection power signal of a to-be-detected radio frequency power supply, envelope detection processing is carried out on the radio frequency power supply forward power signal and the radio frequency power supply reflection power signal to obtain a forward power pulse envelope analog signal and a reflection power pulse envelope analog signal, and time alignment processing is carried out on the forward power pulse envelope analog signal and the reflection power pulse envelope analog signal to obtain a time alignment signal; the synchronous pulse envelope analog signal is input into a preset pulse information calculation model for calculation, and pulse detection information of the radio frequency power supply to be detected is obtained; according to the method, the pulse detection precision and efficiency of the radio frequency power supply are improved.

The disclosure is related to a data processing method and system based on an FPGA implementation using an improved NAG algorithm for a dual-femtosecond laser ranging system. It addresses low ranging accuracy and inefficient FPGA resource use. First, the system acquires pulse signal timestamps and values. Second, optimal learning rate and decay rate parameters are pretrained via grid search in software. Third, the improved NAG algorithm fits the pulse envelope on the FPGA using these parameters, computing the pulse peak time. Finally, the peak time is substituted into the optical distance formula to derive the distance. This approach significantly enhances ranging accuracy while reducing FPGA resource consumption, making it suitable for high-precision applications like atmospheric monitoring and lidar.

The invention provides a complex pulse signal pulse parameter metering calibration device, which comprises an AD sampling device for acquiring a measured signal and performing AD sampling on the measured signal to generate a sampling signal; the calibration module is used for carrying out metering calibration on the sampling signals at a digital end so as to measure pulse parameters, and the items of metering calibration comprise filtering, feature recognition, pulse envelope monitoring, automatic time window taking and pulse parameter measurement; the traceability module is used for tracing the metrological characteristics of the calibration module at the digital end according to the measurement information of the calibration module; wherein the source is traced to a time frequency parameter based on frequency measurement information, the source is traced to a time interval based on pulse width and pulse delay measurement information, the source is traced to a standard pulse rise time based on pulse rise / fall time measurement information, and the source is traced to a standard square wave amplitude based on pulse top fluctuation measurement information. According to the invention, the pulse parameter metering of the complex coded modulation pulse is completed through a digital means, and the metering efficiency and accuracy are improved.

The present application relates to radar technology field, specifically to a kind of efficient ISAR translation envelope compensation method based on iterative updating, first construct the target echo complex matrix X of ISAR and envelope matrix then construct reference pulse number set, and calculate the total correlation level of pulse in set and other pulses, to determine reference pulse η, by calculating the correlation coefficient vector of reference pulse and other pulses and carrying out fitting processing, construct update weight coefficient vector E, based on this to reference pulse η as center to both ends are carried out pulse envelope offset estimation and compensation, to avoid the damage of abnormal pulse to reference envelope, improve environmental adaptability, by set overall pulse information to determine reference pulse iterative updating compensation, realize the fusion of local information and global information, improve the robustness of processing.The present application has the advantages of small amount of computation, easy to engineering implementation, effectively ensure the real-time updating of reference envelope and the efficient, robust realization of ISAR translation envelope compensation.

The application discloses an inverter narrow pulse compensation method, system, device and storage medium, relates to the technical field of power electronics and inverter control, and comprises the following steps: collecting narrow pulse multi-source data through an acquisition unit, inputting the narrow pulse multi-source data into a fitting unit to output a lock pulse characteristic set, inputting the lock pulse characteristic set into a calculation unit to output the number and distribution mode of compensation pulses and save them to a compensation unit, obtaining the lock pulse characteristic set through adaptive polynomial fitting of a lock narrow pulse envelope, obtaining the number of compensation pulses through pulse width and a preset threshold, obtaining the output distribution mode through an envelope and least squares, and superimposing and executing the number and distribution mode of compensation pulses saved in the compensation unit at the same position in the next period. The method has better effects in the integrity of lock pulse representation, the calculability of compensation number and distribution mode, and the cycle consistency of compensation execution.

A method for capturing impact pulses based on the principle of air column resonance and acoustic sensing technology is disclosed. First, a resonant chamber model is designed. Then, an acoustic sensor matching the structure and frequency response requirements of the resonant chamber is selected. Next, a sensor motherboard is designed and manufactured. The acoustic sensor is then integrated onto the motherboard, and the motherboard is connected in series with the resonant chamber structure along the air vent direction to form a gas-filled, airtight chamber. A sensor housing is then manufactured, combining it with the airtight chamber to form an air column resonant acoustic acquisition device. This device is then fixed to the surface of the object being tested to obtain a resonant signal. A filter is constructed using the resonant frequency present in the resonant chamber to enhance the resonant signal through resonant convolution, resulting in an enhanced resonant convolution signal. Envelope analysis is then performed to obtain the impact pulse envelope signal. This invention achieves impact pulse capture in environments with strong background noise by utilizing the principle of air column resonance and acoustic sensing technology, thereby reducing costs.