375 results about "Broadband" patented technology

A broadband omni-directional bicone antenna. The antenna can comprise conductive surfaces of conical voids provided within a solid dielectric structure. The outside surface of the solid structure can support a radio frequency (RF) lens geometry operable for beam forming. The beam forming can modify the elevation pattern of the electromagnetic radiation from the bicone antenna. The solid dielectric structure may be machined or molded from a single piece of material. The conical voids provided within the solid structure can be metallized to provide conductive bicone radiators. The outer surface beam shaping lenses can be zoned or continuous and can provide elevation patterns with increased gain, cosecant squared falloff, or various other patterns. The beam shaping lens may be formed from any low-loss dielectric. Alternatively, the lens may be formed from a less dense material such as dielectric foam that can support radial conductive beam forming vanes.

A catheter placement system for placing a catheter, the system includes a stylet with an optical fiber extending therethrough, the stylet body extending between a proximal end and a distal tip. A console, equipped with optical logic, delivers broadband incidence light to the optical fiber and receives reflected light signals to determine positional information about the stylet body. The stylet body is configured to be separable at a point between the proximal end and distal tip to allow a catheter to be advanced over a distal portion of the stylet body. The distal portion is configured to be reattached to the proximal portion to reconfirm the position of the stylet body distal tip prior to removal of the stylet from the catheter. The system further includes a severing device that is easy to actuate and ensures a clean, perpendicular cut to facilitate reconnection between the proximal and distal portions.

This invention discloses a harmonic suppression control method for a resonant-cascaded active disturbance rejection permanent magnet linear motor (PMLM) based on a positioning force model, belonging to the field of PMLM control technology. Addressing the problems of incomplete periodic harmonic suppression, poor robustness to unknown disturbances, and insufficient synergy between resonance and active disturbance rejection, this invention embeds the positioning force model into the state-space equation of the active disturbance rejection controller and embeds the resonant controller into the second-stage observation channel of a two-stage extended state observer, constructing a three-layer collaborative architecture of model feedforward compensation, resonant frequency selection suppression, and extended state observer broadband estimation. The positioning force model actively compensates for known harmonic disturbances, the embedded resonant controller accurately suppresses residual periodic components, and the extended state observer compensates for nonlinear and aperiodic disturbances in real time. This invention achieves full-link collaborative suppression of positioning force harmonics, inductor asymmetry harmonics, and unknown disturbances in PMLMs under low-speed, high-speed, and variable-speed conditions, significantly reducing current harmonics and improving system stability and control accuracy. Simulation results show that this control method can achieve high-precision servo control of PMLMs.

This invention discloses a multi-wavelength Brillouin and Raman random fiber laser based on tunable broadband Raman pumping, comprising a 1.5μm Brillouin pump, a 1.45μm tunable broadband Raman pump, a wavelength division multiplexer (WDM) I, and a passive fiber. The 1.45μm tunable broadband Raman pump includes a wavelength-tunable cascaded random Raman fiber laser, a WDM II, and a single-mode fiber I. The wavelength-tunable cascaded random Raman fiber laser is injected into the single-mode fiber I through the WDM II. This multi-wavelength Brillouin and Raman random fiber laser based on tunable broadband Raman pumping provides a 1.45μm tunable broadband Raman pump source by back-Raman amplification of the broadband seed light. Working together with the 1.5μm Brillouin pump, it can achieve ultra-wideband multi-wavelength random fiber laser output. By simultaneously tuning the output wavelengths of the Brillouin pump and the Raman pump, wavelength tuning of the broadband multi-wavelength random fiber laser can be achieved.

This utility model discloses a broadband high-speed photodetector module, including: a housing and a driving circuit. The housing has an internal mounting cavity, a high-speed broadband response photodetector, and is fixed inside the housing via an SMA interface. An OLED display screen is embedded on the front of the housing and connected to the driving circuit via a flexible circuit board. The high-speed broadband response photodetector has a spectral response range of 800nm ​​to 1650nm, fully covering the wavelength requirements of multimode and single-mode optical fibers. It solves the limitations of traditional modules with single wavelength or narrow spectrum, significantly improves compatibility with different optical fiber systems, and is suitable for complex hybrid optical fiber network scenarios. Through the coordinated design of the cylindrical body on the side wall of the housing, the air outlet, and the heat dissipation components, the heat generated by the photodetector during operation can be quickly dissipated, avoiding performance degradation or device damage due to temperature rise, and ensuring long-term stable operation of the module under high-speed and high-load conditions.

Techniques pertaining to global cyclic shift delay (CSD) index assignment for 60MHz distributed-tone resource unit (DRU) short training field (STF) transmission in wireless communications are described. An apparatus (e.g., a station (STA) ) performs a wireless communication by: (a) generating and transmitting a DRU of a physical-layer protocol data unit (PPDU) with tones of the DRU distributed on a 60MHz distribution bandwidth of an 80MHz frequency subblock of two or more frequency subblocks of a wider bandwidth; or (b) receiving and processing the DRU. In performing the wireless communication, the apparatus applies a global CSD on transmission of a STF for the DRU in the distribution bandwidth of 60MHz.

The application discloses a kind of broadband fiber spectrometer based on phase modulation, including polarization maintaining optical fiber, fiber collimator A, phase modulation device, fiber collimator B, multimode optical fiber, CCD image sensor and computer that are sequentially arranged, fiber collimator A is set to the light outlet of polarization maintaining optical fiber, phase modulation device carries out phase modulation to the incident light from fiber collimator A, fiber collimator B is set to the light inlet of multimode optical fiber, the light outlet of multimode optical fiber is aligned with CCD image sensor, and CCD image sensor is electrically connected with computer.The application uses the above structure to overcome the problem that spectrum resolution and measurement bandwidth are mutually restricted in fiber spectrometer.

This invention discloses a smart grid dispatching method based on multi-source data fusion, belonging to the field of grid data acquisition and control. This invention senses and analyzes the type and coupling strength of broadband oscillation modes, decides to implement a broadband feature selective retention strategy and grid broadband data processing to retain key broadband dynamic features or filter out redundant oscillation signals. Then, based on the retained broadband dynamic features and power frequency steady-state data, deep multi-source data fusion is performed, and load and renewable energy output probability predictions are made based on the fusion results. Subsequently, a reliability assessment is performed based on the prediction results. If the assessment is satisfactory, the prediction results are input into a multi-objective optimization dispatching model to generate the corresponding dispatching strategy; if the assessment is unsatisfactory, a prediction reliability insufficient warning is sent. This solves the problems of data distortion, accumulated prediction deviations, and discrepancies between grid dispatching strategies and actual dynamic operation caused by the filtering of broadband oscillation signals in existing technologies.

A wireless device is configured to transmit radar signals at extremely low spectral density so that the receiver can be operated at the same time without saturating and thereby enabling full-duplex operation. To achieve sufficient range, beamforming is used together with a very long correlation time for detection of the radar signal, in which case the receiver can resolve backscattered or reflected radar signals far below the noise floor, while the bandwidth of the transmitted radar signal can be very high. The wide bandwidth enables the wireless device to maintain a low power spectral density while increasing output power, and also increase the depth resolution. The extremely low power spectral density even in the transmission beam direction makes the probability that communication will be disturbed very low. The high bandwidth calls for digital filters for both transmitted and received signals to equalize the radar frequency response characteristics of the radio unit.

This invention relates to a method for assessing the defect risk of epoxy-impregnated paper bushing cores under rapid temperature rise conditions, belonging to the field of bushing core insulation condition assessment. This invention aims to solve the problem that existing technologies cannot assess the impact of bushing core defects on partial discharge and dielectric properties under rapid temperature rise scenarios. The technical solution includes: constructing a feature parameter dataset and determining defect classification thresholds; conducting performance parameter tests before and after rapid temperature rise; comparing and analyzing the defect discharge characteristic spectrum of the bushing core, the sensitivity of partial discharge under different voltage measurement methods, and the changes in high-voltage broadband dielectric spectrum characteristic parameters under cyclic voltage excitation; and finally achieving defect risk classification assessment. This invention can comprehensively assess the electrical performance reliability of bushing cores, effectively identify potential defect risks within the core, and provide technical support for the safe and stable operation of ultra-high voltage transmission systems under extreme temperature environments.

This invention discloses a multi-channel programmable miniaturized high-speed FBG demodulation system and method based on an AWG (Optical Fiber Optic Generator), belonging to the field of fiber optic sensing technology. The AWG-based multi-channel programmable miniaturized high-speed FBG demodulation system includes a high-stability broadband light source module, a low-loss isolation module, a miniaturized programmable fiber optic amplifier, a circulator, a two-stage miniaturized high-speed optical switch, a high-crosstalk AWG module, a photoelectric conversion module, a programmable A / D conversion module, and a core control module. The AWG-based multi-channel programmable miniaturized high-speed FBG demodulation method involves the optical signal entering an FBG sensor array, the FBG sensor reflecting the optical signal, the reflected optical signal entering the AWG module, and the output light undergoing photoelectric conversion to calculate the center wavelength of the FBG sensor. This invention, based on an AWG, improves demodulation accuracy while ensuring the demodulation range, achieving continuous wavelength demodulation within the AWG wavelength range.

This invention discloses a broadband oscillation discrimination system and method based on a positive-sequence instantaneous power algorithm, comprising: an A / D sampling module for acquiring an analog signal and obtaining a synchronously sampled digital signal based on the analog signal; an FPGA module for calculating the positive-sequence instantaneous power based on the synchronously sampled digital signal and obtaining a second calculation result; and a CPU module for obtaining a broadband oscillation discrimination result based on the second calculation result. The FPGA module is connected to the A / D sampling module and the CPU module via a parallel data bus. Using positive-sequence instantaneous power to discriminate broadband oscillations can filter out the second harmonic component caused by three-phase imbalance, and also filter out new frequency components caused by this component superimposed on the broadband oscillation instantaneous power.

The application discloses a packaging structure, an electro-optical modulator and an optical quantum computer, and relates to the technical field of optical communication. The packaging structure comprises a tube shell, a support and an electro-optical chip. The electro-optical chip is arranged on the tube shell through the support. The support is used for isolating the tube shell and the electro-optical chip. The packaging structure, the electro-optical modulator and the optical quantum computer can inhibit a parasitic mode and improve the electro-optical broadband of the electro-optical device.

The application provides a broadband high sound absorption ceramic nanofiber and a preparation method thereof, and belongs to the technical field of ceramic nanofibers. The ceramic nanofiber takes amorphous silicon aluminum oxide as a matrix skeleton, and the fiber is internally dispersed with micro-nano composite units composed of a porous zinc oxide core and an interfacial gap region around the core. The composite units are in-situ formed by using the differential volume shrinkage between the core-shell structure ZIF-8@SiO2 precursor particles and the silicon aluminum skeleton during heat treatment. The gap region and the porous core in the fiber reduce the equivalent density and the dynamic bulk modulus of the skeleton, improve the acoustic impedance matching between the fiber and air, reduce the surface reflection of sound waves, increase the specific surface area of the fiber, improve the tortuosity of the sound wave propagation path, strengthen the viscous friction and heat conduction dissipation, and are beneficial to expanding the effective sound absorption frequency band.

This application discloses a high-power, high-isolation three-channel broadband power divider, comprising a metal housing, an input terminal, a first output terminal, a second output terminal, a third output terminal, a first composite bridge, a second composite bridge, a third composite 5dB coupler, a first RF resistor, and a second RF resistor. The input terminal is connected to the first composite bridge, the first RF resistor is connected to the first composite bridge, the first composite bridge is connected to both the second composite bridge and the third composite 5dB coupler, the first output terminal is connected to the second composite bridge, the second output terminal is connected to the second composite bridge, the second composite bridge is connected to the third composite 5dB coupler, the third output terminal is connected to the third composite 5dB coupler, and the second RF resistor is connected to the third composite 5dB coupler. This high-power, high-isolation three-channel broadband power divider achieves the high-power requirements of the entire device through structural design.

This invention discloses a microwave absorber and its fabrication method. The microwave absorber includes multiple absorber units, each of which includes a dielectric layer and a patterned carbon-based conductive layer formed on the dielectric layer. The carbon-based conductive layer includes a central pattern and four peripheral patterns surrounding the central pattern. The central pattern includes a pair of parallel first vertical line segments and a first horizontal line segment connecting the middle of the first vertical line segments. Each first vertical line segment connects to two adjacent peripheral patterns. Each peripheral pattern includes a pair of parallel second vertical line segments and a second horizontal line segment connecting the middle of the second vertical line segments. The first vertical line segments connect to the second vertical line of one peripheral pattern and extend to the second horizontal line segment of another peripheral pattern. This microwave absorber facilitates bandwidth expansion and exhibits good broadband reflection suppression.

The application discloses a frequency modulation rate variable laser linear frequency modulation device and a frequency modulation method thereof. The device comprises a wideband tunable laser, a micro-optical lens, a beam splitter, an adjustable optical delay unbalanced MZ interferometer, a balanced photodetector, a phase discriminator, a loop filter, an up / down switch control circuit and an integrator. The adjustable optical delay unbalanced MZ interferometer comprises two couplers and an adjustable optical fiber delay line unit. According to the relationship between the linear frequency modulation light frequency and time of the upper and lower arms of the interferometer, when the delay amount of the adjustable optical fiber delay line unit changes, the frequency modulation rate of the output laser can be changed. The application changes the time delay of the light by using the adjustable optical fiber delay line, so that the frequency modulation rate can be changed.

The application discloses a FAST core array broadband beam effect elimination method based on deep learning, relates to the technical field of radio astronomy image processing, and constructs an end-to-end image restoration system, which comprises the following five steps: acquiring an observation image containing a broadband beam effect; extracting multi-scale features and introducing a spatial perception mechanism; performing feature frequency domain enhancement processing and multi-scale context fusion; and outputting a multi-scale prediction image and a restored image from which the broadband beam effect is removed. The application realizes the function of improving imaging quality by constructing a deep learning model, avoids cumulative errors caused by step-by-step processing, can effectively remove broadband beam distortion, and makes the reconstructed image more close to the real sky brightness distribution in overall fidelity and structural details, and has higher physical consistency.

The present application relates to the field of power system stability analysis and control, in particular to a kind of thermal mass energy storage converter broadband oscillation suppression parameter stable domain identification method, comprising the following steps: establish general electric-thermal coupling mechanism model, construct the dynamic differential equation describing the evolution of input electric power and energy storage medium temperature state of converter;Mechanical dynamics equation is constructed;Establish the small signal state space model of whole system, linearization is carried out at steady state operating point and the state space matrix of whole system is derived;Define practical small disturbance stability domain, set the real part decay rate threshold and minimum damping ratio threshold of whole system eigenvalue;Algebraic singularity constraint equation in high-dimensional parameter space is constructed;Solve algebraic singularity constraint equation, establish parameter stable domain.This method avoids the repeated iteration of traditional eigenvalue analysis, can accurately depict parameter boundary, effectively improve the frequency support capability of high proportion of new energy power grid and system robustness.

The application discloses a broadband voltage buffer and belongs to the technical field of voltage measurement and signal conditioning. The application comprises a signal input module, an attenuation module, a buffer module, a filter module, a gain adjustment module and a signal output module; the signal input module is used for receiving a measured voltage signal, and the measured voltage signal is sequentially attenuated, buffered, filtered and gain-processed through the attenuation module, the buffer module, the filter module and the gain adjustment module, and then the processed measured voltage signal is output to an external device by the output module. The application constructs a modular voltage signal conditioning structure, so that the functional units work cooperatively, the anti-interference ability and environmental adaptability of the device are improved, and the protection ability of the back-end measuring equipment is enhanced.

This invention relates to the field of lighting control technology, specifically disclosing an environment-adaptive LED constant current energy-saving control method. The method includes: arranging a dielectric-photoelastic sensing array, a magnetostrictive-leakage flux detection coil, and a broadband impedance spectrum detection unit on the phosphor encapsulation layer, the inductor core, and the output bus, respectively; simultaneously acquiring three types of timing signals; extracting dielectric-magnetic-electric coupling degradation feature vectors; inputting the feature vectors into an energy-saving-lifetime co-optimization model; correcting the target luminous flux based on the dielectric relaxation offset; constructing a core loss-efficiency mapping surface to solve for the minimum energy consumption operating point; generating a constant current target value offset sequence and a PWM chopper phase-frequency co-transfer strategy; and simultaneously adjusting the duty cycle, switching frequency, and gate impedance through a feedforward-feedback composite adjustment network, and feeding back the current ripple spectrum and dielectric relaxation offset to update the feature vector weights. This invention achieves multi-physics field co-sensing and energy-saving-lifetime co-optimization.

The application discloses a water conservancy tunnel surrounding rock intersection section stability prediction method, device, equipment and medium, the method comprises the following steps: through collecting and analyzing the broadband microseismic response signal of the rock mass under the construction disturbance, the internal structure dynamic change data of the deep rock mass is inverted and output in real time; the response signal of the optical marker in the surrounding rock is captured and analyzed in real time, the three-dimensional dynamic stress field distribution data and the seepage path data of the surrounding rock of the intersection section are reconstructed and output; the digital twin model of the surrounding rock of the tunnel intersection section is constructed; the internal structure dynamic change data of the deep rock mass and the three-dimensional dynamic stress field distribution data and the seepage path data are input to the digital twin model as dynamic boundary conditions in real time, the subsequent motion state of the three twins is deduced by driving the digital twin model; when the motion state of the three twins deduced by the digital twin model shows chaotic characteristics, a surrounding rock instability early warning is sent. The application realizes real-time perception and dynamic evolution early warning of the internal state of the surrounding rock.

The present invention relates to a frequency steered phased array antenna which adjusts beam radiation angle according to frequency for broadband electromagnetic waves, and radiates beams of uniform intensity over a broad range of angles including directly forward. The frequency steered phased array antenna according to the present invention comprises: a directional coupler including a serial feed line that is stacked in n layers and has a plurality of coupling holes formed in one direction in each of the layers; and a radiating module including n horn antennas respectively connected in correspondence to the n layers of the serial feed line, wherein the plurality of coupling holes are formed in each of the layers of the serial feed line at intervals of ¼ of the wavelength (λ) of electromagnetic waves (radio waves) supplied to the serial feed line, and the horn antennas radiate the electromagnetic waves output through the coupling holes of the serial feed line.

This invention discloses a sound velocity profile assimilation and inversion method and system based on dual physical data driving. The method includes: performing adaptive observation and sparse characterization of the sound propagation path to obtain the sparse characterization results; performing long-term noise cross-correlation calculation and passive time delay self-calibration to obtain the virtual sound source arrival time series after absolute time delay reference correction; performing constraint verification through a physical-data dual-driven, dual-stream coupled generative inversion network; acquiring a broadband electromagnetic response time series and performing cross-medium electromagnetic-acoustic joint inversion constraints to obtain a strongly constrained calibrated full-depth sound velocity profile; and performing ensemble Kalman filtering assimilation and uncertainty propagation based on POD order reduction. This invention can quantify the uncertainty of the inversion results. As a sound velocity profile assimilation and inversion method and system based on dual physical data driving, this invention can be widely applied in the field of underwater acoustic engineering technology.

This application discloses an offshore floating semi-submersible platform and an offshore power generation system. The offshore floating semi-submersible platform provided by this application includes a platform body equipped with wind turbine components and photovoltaic components to achieve wind and solar complementary power generation. A heave assembly is provided below the platform body, which includes at least two different sizes of heave plates and forms at least two moon pool structures, which together constitute a damping coupling system. The differentiated heave plates provide a graded response to broadband waves, and the moon pool structure adds additional mass and radiation damping, thereby continuously consuming wave energy, significantly reducing the platform's heave response, and improving operational stability. The photovoltaic components include fixed photovoltaic panels and telescopic photovoltaic panels. The fixed photovoltaic panels are located on the top surface of the platform body, and the telescopic photovoltaic panels can switch between a retracted state and an extended state, effectively increasing the photovoltaic power generation area and improving power generation efficiency.

The application provides a visible light band optical fiber SPR liquid refractive index linear measurement device and method, the device comprises a broadband light source, a first lens and a second lens, a polarizer, a third lens and a fourth lens, a pinhole, a fifth lens, an optical fiber SPR, a sixth lens, a diffraction grating, a concave mirror, a linear array CCD and a data processing unit; the data processing unit is used for extracting the resonance wavelength corresponding to the normalized light intensity minimum value from the wavelength-intensity spectrum curve, and calculating the refractive index of the liquid medium to be measured according to the linear relationship between the refractive index and the resonance wavelength which is calibrated in advance. The device is not only intuitive in optical path debugging and easy to operate, but also has a rigorous theoretical model and high measurement precision, and is very suitable for rapid and accurate refractive index screening and analysis of a large number of low-concentration liquid samples, and has wide application prospect and industrial value.

The application discloses a low-profile miniaturized flat plate vibrator antenna and relates to wireless communication technology. By removing a parasitic unit above a conventional flat plate vibrator antenna, the low-profile problem of the conventional flat plate vibrator antenna is solved; a matching network is loaded at the end of a metal blade, and a coupling block is loaded in the middle, so that broadband design of the antenna is realized; four metal blades are distributed along a central axis at an angle of 90 degrees, one pair of connectors is used as a main radiation structure, and the other pair of connectors is used as a coupling structure, so that the antenna is simple and compact.

This invention relates to the field of unmanned aerial vehicle (UAV) navigation technology, specifically to an autonomous navigation control method for UAVs in strong electromagnetic environments. The method includes: acquiring raw electromagnetic interference signals within the flight airspace using a multi-band electromagnetic spectrum sensor array mounted on the UAV, containing broadband power spectral density distribution, pulse interference timestamp sequences, and phase jitter characteristics at specific frequencies; generating an interference source distribution heatmap using an electromagnetic environment feature analyzer, and constructing an electromagnetic situational awareness constraint field by fusing inertial navigation attitude data; dynamically reconstructing the global flight path topology based on this constraint field, generating a set of local flight path segments that avoid high-interference sectors and marking their electromagnetic safety margin levels; and spatially registering the ground feature point image sequence acquired by an optically assisted positioning module with the local flight path segment set to generate composite navigation guidance commands. This method can effectively adapt to strong electromagnetic environments, improving the stability and accuracy of UAV autonomous navigation.