66 results about "Broadband pulse" patented technology

The invention discloses an ultra wide band direction finding information extraction method based on a multi-input single-output delay superposition network. The method comprises the following steps: acquiring an antenna receiving signal and an attitude transformation matrix of an antenna; processing an antenna receiving signal to obtain a time point of a first peak leading edge detection threshold value and pulse sequence data in a complex form; carrying out 64-time up-sampling processing on the pulse sequence data in the plural form, and drawing an amplitude-time curve and a phase-time curve; determining a peak value corresponding to the adjacent antenna according to the peak value leading edge time point; calculating the peak values corresponding to the adjacent antennas to obtain the time difference of arrival and the phase difference of the adjacent antennas; and ultra-wideband direction-finding information positioning is realized. According to the invention, group delay can be carried out on the ultra-wideband pulse signal by adopting the delay line with the given length, and the ultra-wideband direction-finding information positioning precision is improved. The ultra wide band direction finding information extraction method based on the multi-input single-output delay overlay network can be widely applied to the technical field of ultra wide band positioning.

The invention relates to the technical field of audio processing and automobiles, discloses a sound synthesis method, device and system, a vehicle and a medium, and is used for solving the problem that when audio is spliced, instantaneous broadband pulse signals are generated, splicing transition is not coherent, and consequently sonic boom occurs during playing. The method comprises the following steps: acquiring N audio clips needing to be spliced, wherein N is greater than or equal to 2; according to a pre-debugged window function adjustment parameter, adjusting a window function curve shape at the splicing part of the audio clips; and according to the shape of the window function curve at the splicing part of the audio clips, correspondingly splicing the audio clips needing to be spliced in the N audio clips to obtain a synthesized audio.

This application provides a method and system for locating low-frequency broadband pulse signals under unknown environmental information. The method includes: obtaining the broadband wavenumber spectrum of the pulse signal using a hypothetical dedispersion formula; obtaining preliminary estimates of each mode using a variational Bayesian method; searching for optimal waveguide invariants and reference sound velocities; re-estimating each mode; and finally, substituting the wavenumber and phase information of each mode into a distance estimation cost function to estimate the distance to the pulse source. The advantages of this application are: by using the dedispersion formula and the variational Bayesian method, mode separation of broadband pulse signals can be achieved even with a short horizontal array aperture; and the phase difference between different modes can be used to estimate the source distance. Through this method, the optimal waveguide invariants and reference sound velocities can be searched under conditions lacking environmental information, reducing the error in source distance estimation.

The present invention relates to the field of radio frequency measurement technology, and discloses a broadband pulse measurement method based on a vector network analyzer. Aiming at the problem that the device under test cannot withstand long-term high-power signals, a special measurement scheme is designed for the vector network analyzer. The radio frequency source signal is modulated by a pulse switch, and the signal is down-converted to an intermediate frequency after passing through the device under test, and the intermediate frequency is then pulse modulated and filtered. A pulse modulation source is designed for radio frequency and intermediate frequency signal modulation and reception sampling synchronization to ensure that the sampling bandwidth is within the positive pulse width of the pulse period. When sampling, a reference pulse rising edge is introduced to trigger the digital down-conversion working state. After software delay, sampling is performed to achieve synchronization between sampling and intermediate frequency signal, and the results are accurate, stable and fast. In addition, in order to achieve distortion of the intermediate frequency signal link after radio frequency modulation, a modulation signal is introduced to further modulate and improve it. This scheme can effectively measure the amplitude-frequency characteristics, phase and other characteristics of the device under test.

The present invention discloses a high-frequency modulation oscillator device for composite memristor and liquid pool electrochemical reaction, which relates to multiple fields such as electronic component technology, neuromorphic devices, and electronic information processing. The high-frequency modulation oscillator device comprises a DC power supply, a first electrode, a redox liquid pool, a second electrode, and a memristor. The conductive state transition is achieved through a threshold switching effect. By virtue of the series connection of the redox liquid pool and the memristor working circuit, a solid-liquid interface working environment is constructed. Driven by DC voltages of different amplitudes, the device can achieve stable oscillation in a wide frequency range from a few tenths of a hertz to several kilohertz. The device is suitable for multiple application scenarios such as simulating artificial neuron behavior, generating broadband pulse trains, and processing digital signals.

Active auscultation can be used to determine the characteristics of a user's organs (e.g., lungs or heart). An acoustic or piezoelectric signal (e.g., pulses, tones, and / or broadband pulses) can be projected onto the body or chest of an animal (typically a human). The signal interacts with the body or lungs and, in some cases, may cause resonance within the body / lungs. The resulting signal can be emitted from the body and analyzed to determine, for example, the resonant frequency of the lungs and / or how the sound is absorbed, reflected, or modified by the body. This information can indicate lung characteristics such as lung capacity, the amount of air trapped in the lungs, and / or the presence of COPD.

The invention discloses an absolute method broadband microphone calibration device, which comprises a broadband sound source, a translation rotating table, a laser vibration measurement system and a measurement and control system, and is characterized in that the broadband sound source generates a broadband pulse sound signal to form a broadband pulse sound field, and the translation rotating table drives the broadband sound source to perform translation and rotation motion to form a broadband pulse sound field; the laser vibration measurement system measures the vibration velocity of an air mass point in the pulse sound field, scanning of the pulse sound field is achieved through translation and rotation of the broadband sound source, the calibrated broadband microphone is installed in the pulse sound field, and the sound center position of the calibrated broadband microphone coincides with the center point position of a scanning plane; and the measurement and control system controls the laser vibration measurement system to scan the broadband pulse sound field, collects the output of the laser vibration measurement system, reconstructs the pulse sound field, and realizes absolute method calibration of the calibrated broadband microphone. According to the method, the boundary dimension, the number and the reciprocity of the microphone to be calibrated are not required, segmented calibration is not required, and absolute method calibration of the broadband microphone at 20-100 kHz can be realized.

This invention relates to the field of optical inspection technology, specifically to a micro LED wafer-level rapid defect localization system based on photoluminescence. A broadband pulse excitation module outputs pulsed laser light matching the characteristics of the material under test; a two-dimensional scanning platform carries the wafer and achieves nanometer-level precise positioning; a time-resolved acquisition module collects fluorescence signals and converts them into time-resolved photoluminescence data; a data processing and control module synchronously controls the operation of each module, receives and processes the time-resolved photoluminescence data, extracts the transient luminescence intensity and carrier lifetime of each detection point, compares the two-dimensional feature vector formed by these two parameters with a preset defect feature database, identifies the defect type of each micro LED chip, and generates a wafer-level defect fingerprint spectrum. This system can accurately distinguish different types of failure modes such as epitaxial defects, surface state defects, and poor electrode contact, significantly improving detection efficiency and defect classification accuracy.

The purpose of the present invention is to provide a Brillouin scattering measuring device capable of compensating for fluctuations in a frequency component of broadband probe light and performing highly accurate measurement.　A Brillouin scattering measuring device according to the present invention: acquires broadband probe light that includes Brillouin scattering light and broadband probe light that does not include Brillouin scattering light by using two broadband pulsed light beams having the same optical characteristics; compensates for fluctuations in a frequency component of the broadband probe light that includes Brillouin scattering light on the basis of the broadband probe light that does not include Brillouin scattering light; and performs Lorentzian fitting on a signal obtained by dividing the broadband probe light that includes Brillouin scattering light by the broadband probe light that does not include Brillouin scattering light to determine a peak position in a BGS.

The invention discloses an on-line measuring device and method for a high-energy broadband pulse laser light field and a far-field focal spot. Broadband pulse laser generated by a high-energy laser device is processed by an intensity attenuation system and then reaches a light splitting element; the light beam penetrating through the spectroscope penetrates through a coding plate, the coding plate is used for carrying out coding modulation on the light beam, and then a table array light intensity detector is used for recording the intensity of a single-frame diffraction image formed after modulation of the coding plate; and the spectral data of the light beam reflected by the light splitting element is recorded by a spectral analysis unit. The near-field complex amplitude (intensity and phase) distribution of a to-be-measured high-energy broadband pulse laser light field can be accurately reconstructed through a multi-mode light field reconstruction algorithm by means of single-frame diffraction image intensity recorded on line by an area array light intensity detector and single-time spectrum data recorded on line by a spectrum analysis unit, and meanwhile far-field focal spot distribution can be obtained through inversion. The method has the advantages of simple structure, low cost, strong environment anti-interference capability and the like.

The invention discloses a broadband achromatic programmable electromagnetic camouflage device based on a fluid access metasurface. The broadband achromatic programmable electromagnetic camouflage device comprises the fluid access metasurface composed of a plurality of periodically arranged super units. Each super unit comprises a plurality of units arranged in a matrix; each unit comprises a microfluid channel layer and a solid metal layer, and the microfluid channel layer is located above the solid metal layer; the microfluid channel layer is connected to an external driving system through the injection and discharge port, and the external driving system is used for injecting liquid metal or dielectric liquid into the microfluid channel layer; when the microfluid channel layer is filled with liquid metal, the unit is in a first working state; and when the micro-fluid channel layer is filled with the dielectric liquid, the unit is in a second working state. According to the invention, linear phase dispersion control can be realized in a broadband, and it is ensured that the generated false target echo keeps high fidelity in a time domain when facing a broadband pulse radar.

This application provides a method, apparatus, medium, and equipment for locating cable defects based on a terminal grounding wire. The method includes: injecting a broadband pulse current signal with a predetermined repetition frequency into the cable grounding wire at the terminal connection of an in-service cable; acquiring the current signal from the cable grounding wire; and analyzing and diagnosing the current signal in the time or frequency domain to locate potential defects in the in-service cable. This application can solve the problems of needing to disconnect the cable system topology, exposing cable cores, and poor on-site anti-interference capabilities when diagnosing faults.

The purpose of the present invention is to provide a Brillouin scattering measuring device capable of compensating for fluctuations in a frequency component of broadband probe light and performing highly accurate measurement.　A Brillouin scattering measurement device according to the present invention uses two broadband pulsed light beams having the same optical characteristics, acquires broadband probe light including Brillouin scattered light, and broadband probe light that does not include Brillouin scattered light, and compensates for fluctuations in a frequency component of the broadband probe light including Brillouin scattered light on the basis of the broadband probe light that does not include Brillouin scattered light.

The invention provides a semiconductor laser power supply based on linear constant current and a design method thereof, and relates to the technical field of lasers. The system comprises a front-stage charging network and a rear-stage discharging network, wherein the rear-stage discharging network is connected with the front-stage charging network; the post-stage discharge network comprises a voltage reference calibration module, a linear constant current driving module, a broadband pulse control module, an intelligent power switch module, a high-precision sampling feedback module and a multiple follow current protection module. The input end of the voltage reference calibration module is connected with external reference voltage, and the output end is connected with the linear constant-current driving module; the linear constant-current driving module is connected with the broadband pulse control module; the broadband pulse control module is connected with the intelligent power switch module; the intelligent power switch module is connected with the semiconductor laser load. According to the invention, accurate current control can be realized, and current impact during mode switching is avoided.

The invention provides a frequency spectrum shifting system and method for an ultra-wideband pulse signal, belongs to the technical field of communication, and can perform frequency spectrum shifting on the ultra-wideband pulse signal, thereby improving the frequency band of the ultra-wideband pulse signal and further improving the detection performance of the ultra-wideband pulse signal in a target detection process. The system comprises a clock circuit, a digital waveform generator, a modulation signal source, a band-pass filter, a single-pole single-throw switch and a signal amplifier.

The application belongs to the field of underwater acoustic signal processing and analysis, and discloses a wideband sound source DOA estimation method based on the multipath characteristics of a shallow sea channel. The method first combines a wideband pulse signal with a frequency domain sound pressure wideband, and then performs Fourier transform on the combined signal to perform time-frequency analysis. Then, the signal is subjected to Warping transformation to separate and extract each order signal of the normal mode wave, and the time-domain signal is obtained. The obtained time-domain signal is then passed through a vector hydrophone to obtain a complex sound intensity vector corresponding to the signal in the frequency domain. Finally, the obtained complex sound intensity vector is subjected to DOA estimation to obtain the average value of the direction angle. Compared with the traditional method, the DOA estimation method effectively suppresses the interference caused by the multipath characteristics and improves the accuracy of DOA estimation.

Molecular rotation resonance (MRR) spectroscopy is a structure-specific high-resolution spectroscopy technique that can identify chemical species, including enantiomers, that cannot be distinguished by other analytical techniques. In MRR spectroscopy measurements, a gas phase sample is injected into a vacuum chamber in which the gas phase sample is excited with millimeter wave or microwave radiation, and in response, the gas phase sample emits a free induction pulse (FID). The spectrum of the FID pulses provides information about the chemical structure of the sample. In MRR ratio method measurements, the sample is irradiated simultaneously by two excitation pulses at different frequencies (e.g., broadband pulses and narrowband pulses of different frequency bands or narrowband pulses at different frequencies). The pulses stimulate simultaneous or overlapping FID emissions of different components of the sample. The spectra of these FID emissions are compared, resulting in a ratio of the components in the sample.

An apparatus, including: an oscillator configured to generate a clock signal; a clock signal synthesizer configured to generate a first clock signal, a second clock signal, and a third clock signal, wherein the first, second, and third clock signals are based on the clock signal; a baseband transmitter configured to generate a transmit baseband digital signal in response to the first clock signal; an ultra-wideband (UWB) pulse digital-to-analog converter (DAC) configured to generate a UWB pulse signal based on the transmit baseband digital signal in response to the second clock signal; and a frequency upconverter configured to frequency upconvert the UWB pulse signal to generate a transmit radio frequency (RF) signal based on the third clock signal.

The present invention discloses a method for designing high-isolation broadband local oscillators for a de-skewed imaging system. The method can achieve high-isolation broadband local oscillators for de-skewed ISAR imaging radar systems. The de-skewed ISAR imaging radar system's transmitting branch includes a narrowband LFM signal source, up-conversion and frequency multiplication, and power amplification. The receiving branch includes a limiting low-noise amplifier, down-conversion, filtering, ADC acquisition, and an imaging processor. The broadband pulse transmission waveform and the broadband LFM de-skewed local oscillator are designed for time-division generation, generated by sharing the same up-conversion and frequency multiplication module. A frequency difference is maintained between the broadband pulse transmission waveform and the broadband LFM de-skewed local oscillator. Digital time-frequency domain leakage cancellation is performed on the signal acquired by the ADC. The present invention can simply and efficiently meet the requirements for high-isolation broadband local oscillators in de-skewed ISAR imaging radar systems, avoid the problem of imaging quality degradation caused by leakage signals, has low hardware implementation requirements, strong versatility, and good scalability, and can meet the requirements of long-distance high-resolution imaging.

A broadband impulse generator includes a first delay line and a second delay line that receive an input signal and include a plurality of delay elements connected in series with each other, an oscillation signal generator that generates an oscillation signal having a certain number of pulses during a target impulse duration based on the input signal and an output signal of the first delay line, an envelope signal generator that generates a plurality of envelope signals having a delay duration with each other and having a certain voltage level during the target impulse duration, based on the input signal and an output signal of the second delay line, and an impulse signal generator that generates an impulse signal having the certain number of pulses during the target impulse duration based on the plurality of impulse signals and the oscillation signal.

An apparatus comprising: an oscillator configured to generate a clock signal; a clock signal synthesizer configured to generate a first clock signal, a second clock signal, and a third clock signal, where the first clock signal, the second clock signal, and the third clock signal are based on the clock signal; a baseband transmitter configured to generate a transmit baseband digital signal in response to the first clock signal; an ultra wide band (UWB) pulse digital-to-analog converter (DAC) configured to generate a UWB pulse signal based on the transmit baseband digital signal in response to the second clock signal; and an up-converter configured to up-convert the UWB pulse signal based on the third clock signal to generate a transmit radio frequency (RF) signal.

The invention discloses a miniaturized ultra wide band antenna, a UWB positioning terminal and a positioning method thereof. The antenna comprises a dielectric substrate, a radiation unit, a grounding plate and an excitation source, wherein the radiation unit, the grounding plate and the excitation source are stacked on the same outer surface of the dielectric substrate; the grounding plate and the radiation unit are arranged at intervals; the excitation source is arranged between the radiation unit and the grounding plate, and is electrically connected with the radiation unit and the grounding plate. The grounding plate and the radiation unit form a radiation loop, a first ultra-wideband pulse electric signal generated by the excitation source is converted into a first electromagnetic pulse signal, and the first electromagnetic pulse signal is emitted to the space; and a second electromagnetic pulse signal reflected by the positioning target in the space is converted into a second UWB pulse electric signal and the second UWB pulse electric signal is transmitted to the excitation source, so that the UWB positioning terminal obtains the positioning information. The antenna is compact in structure and low in cost, the optimal balance among the size, the cost and the regulation compliance is ensured, and the UWB terminal equipment is promoted to develop in a more compact, more economical and more compliant direction.

A non-intrusive power distribution network impedance spectrum online detection system and method based on wideband current pulse, the system comprises a signal injection module, a signal acquisition module, a signal processing and spectrum reconstruction module, an impedance feature recognition and abnormal diagnosis module, a control and communication module. The method comprises power-on initialization, detection timing determination, wideband pulse injection and synchronous acquisition, impedance characteristic analysis and abnormal diagnosis, adaptive closed-loop control and system protection. The system injects low-energy, short-time wideband current pulses in selected time slots to obtain line transient response signals without interfering with power supply and communication, and reconstructs the wideband impedance spectrum through time-frequency analysis to realize high-resolution online detection of the power distribution network.

This invention discloses a direction-finding sensor device based on a single-receiver ultra-wideband antenna array. The device includes an MCU microcontroller, an IMU sensor, a barometric altimeter, an ultra-wideband receiver, and a multi-input single-output (MIMO) delay overlay network. The MIMO delay overlay network has a delay line module. The output of the MIMO delay overlay network is connected to the input of the ultra-wideband receiver via a first data bus. The ultra-wideband receiver is interconnected with the MCU microcontroller via a second data bus. The MCU microcontroller is interconnected with the barometric altimeter via an SPI bus. The output of the IMU sensor is connected to the input of the MCU microcontroller via a third data bus. This invention can improve the positioning accuracy of ultra-wideband direction-finding information by using a delay line of a given length to perform group delay on ultra-wideband pulse signals. As a direction-finding sensor device based on a single-receiver ultra-wideband antenna array, this invention can be widely used in the field of ultra-wideband positioning technology.

The invention discloses a broadband pulse radiation device integrating a high-voltage pulse generation circuit and a microstrip antenna, and belongs to the field of electronic circuits. The device comprises a trigger signal input circuit, N stages of Marx circuits and N / 3 microwave radiation modules, wherein the rear stage of each three-stage Marx circuit is connected in series with a microwave radiation module with electromagnetic emission capability, and the working frequency of the microstrip patch antenna in each stage of microwave radiation module is gradually increased. According to the invention, a high-frequency pulse sequence of a plurality of frequency points can be generated in a far field, so that signal coverage of a wider frequency band can be realized; besides, the device can directly emit energy to the space in the discharge conduction process, transmission line coupling, a synthesizer and other structures are not needed, and loss and complexity caused by signal synthesis are avoided.

The present application provides a kind of wideband pulse light source device with excellent performance, which solves the problem of SC light with seed light wavelength region remaining at high intensity. The light from the pulse laser source (1) is made to generate nonlinear effect by the nonlinear element (2) to generate supercontinuum light, and the light of the oscillation wavelength of the residual pulse laser source (1) is attenuated when being split by the dichroic mirror (32). The split light is pulse stretched by the optical fiber (41), and is multiplexed by the multiplexing element (33) to irradiate the object (S). The light transmitted through the object (S) is received by the light receiver (6), and the output signal thereof is converted into a spectrum by the operation unit (7).

The invention relates to a high-speed optical fiber Fabry-Perot sensor demodulation method and system based on photon time stretching. The method comprises the following steps: emitting a broadband pulse light signal through a pulse broadband light source; transmitting the broadband pulse optical signal to an optical fiber Fabry-Perot sensor, sensing physical quantity by the optical fiber Fabry-Perot sensor, and generating a frequency domain Fabry-Perot interference signal containing cavity length information; transmitting the frequency domain Fabry-Perot interference signal to a time stretching element, and mapping the frequency domain Fabry-Perot interference signal from a frequency domain to a time domain to obtain a time domain Fabry-Perot interference signal; performing photoelectric conversion and acquisition on the time domain Fabry-Perot interference signal to obtain a digital electric signal; and tracking the time domain characteristic change of the time domain Fabry-Perot interference signal, and demodulating the cavity length of the optical fiber Fabry-Perot sensor. According to the method, high precision of frequency domain interference and high speed of time domain acquisition are combined, and Doppler errors in dynamic measurement are avoided, so that high-speed, high-precision and high-dynamic demodulation of the cavity length of the optical fiber Fabry-Perot sensor is realized.

A diffractive network is disclosed that utilizes, in some embodiments, diffractive elements, which are used to shape an arbitrary broadband pulse into a desired optical waveform, forming a compact and passive pulse engineering system. The diffractive network was experimentally shown to generate various different pulses by designing passive diffractive layers that collectively engineer the temporal waveform of an input terahertz pulse. The results constitute the first demonstration of direct pulse shaping in terahertz spectrum, where the amplitude and phase of the input wavelengths are independently controlled through a passive diffractive device, without the need for an external pump. Furthermore, a modular physical transfer learning approach is presented to illustrate pulse-width tunability by replacing part of an existing diffractive network with newly trained diffractive layers, demonstrating its modularity. This learning-based diffractive pulse engineering framework can find broad applications in e.g., communications, ultra-fast imaging and spectroscopy.

The application provides a cable defect positioning method and device based on a grounding lead at an insulation joint, a medium and equipment. The grounding lead is connected between an insulation joint of adjacent two cable sections of each phase cable in a three-phase cable in service and a grounding box, and the grounding box includes a cross-interconnected grounding box or a straight-through grounding box. The method includes: injecting a broadband pulse signal with a predetermined repetition frequency into the grounding lead at the insulation joint of the adjacent two cable sections; collecting a current signal of the grounding lead; and analyzing and diagnosing the current signal in a time domain or a frequency domain to position hidden defects of the cable. The application breaks through the limitation that a traditional detection must remove transposition copper bars or short-circuiting bars in the grounding box, directly uses the grounding lead at the insulation joint for testing, maintains the complete topology of the cable system, and greatly shortens the maintenance time.

This invention discloses a microscopic transient angle-resolved reflection / transmission spectroscopy measurement system based on a streak camera, belonging to the field of microscopic angle-resolved spectroscopy measurement. The invention includes a reflection excitation optical path, a transmission excitation optical path, a collection optical path, and a microscopic illumination module. The reflection / transmission excitation optical path converts a pulsed laser source into a broadband pulsed white light source and focuses it onto the sample surface. The collection optical path achieves time resolution through a streak camera, angle resolution through a pinhole on the k-space plane, and wavelength or energy resolution through a grating. The microscopic illumination module illuminates the sample to determine its position. This invention can acquire transient angle-resolved spectra at different times, analyze the ultrafast dynamics of angle-resolved spectra, and simultaneously acquire information in three dimensions: time, angle, and wavelength. By analyzing the light signal from these three dimensions, it can comprehensively analyze the sample's response to the excitation light and thus determine the coupling state between light and matter in the sample.