2504 results about "Operating frequency" patented technology

A reflective device includes a control element and a reflective surface. The reflective surface includes a plurality of reflective elements, where each reflective element of the plurality of reflective elements has an antenna element and a phase shifter and is under control of the control element so as to reflect a radio-frequency (RF) signal incident on the reflective surface with an adjustable phase shift. An operating frequency of the reflective surface is configurable by at least a subset of the plurality of reflective elements being divided into a number of sub-elements that are individually switched via the control element from an activated state, in which a respective sub-element contributes to the reflection of the incident RF signal, to a deactivated state, in which the respective sub-element does not contribute to the reflection of the incident RF signal, and vice-versa.

The invention relates to the technical field of power management, in particular to an intelligent computing resource energy-saving scheduling system based on load prediction, which comprises a cache access monitoring module, a burst load judgment module, a frequency fluctuation analysis module, a load classification and identification module and an intelligent regulation and control strategy module. According to the method, the access frequency fluctuation is analyzed by monitoring the cache access data, the access mode change is identified, the load judgment precision is improved, the burst load identification is enhanced in combination with the hit rate reduction range, the resource scheduling is more accurate, the CPU / GPU operation frequency and the fluctuation rate are monitored, the abnormal fluctuation is identified, the calculation resource allocation is optimized, and the energy consumption waste of frequency adjustment is reduced; load classification, resource matching degree optimization, dynamic adjustment of CPU / GPU computing power and memory allocation, coordination of computing and data transmission, optimization of energy consumption management, guarantee of task stability and reduction of idle and unbalanced resource problems are carried out based on a time proportion and task characteristics.

The invention provides a broadband Doherty power amplification circuit based on a coupler balun active load modulation network, which belongs to the field of radio frequency integrated circuits and comprises an input matching network, a self-adaptive biasing circuit, a main power amplifier, an auxiliary power amplifier and an output matching network. And the output matching network consists of two pairs of differential couplers and a section of 30-degree transmission line, so that the Doherty power amplifier has a broadband active load modulation function. Under a 65-nanometer CMOS (complementary metal-oxide-semiconductor transistor) process, in a working frequency range of 40% of relative bandwidth, the power back-off characteristic is good, and the back-off efficiency is high in a broadband range.

A dual-frequency antenna and an electronic device are provided, and belong to the field of communication technology. The dual-frequency antenna includes a first antenna unit and a second antenna unit opposite to each other, and a filtering unit therebetween. An operating frequency band of the first antenna unit is a first frequency band; an operating frequency band of the second antenna unit is a second frequency band; the filtering unit is configured to reflect an electromagnetic wave of the first frequency band and to transmit an electromagnetic wave of the second frequency band; the first antenna unit is configured to receive the electromagnetic wave of the first frequency band and to reflect the received electromagnetic wave of the first frequency band by the filtering unit; and the second antenna unit is configured to receive and reflect the electromagnetic wave of the second frequency band transmitted by the filtering unit.

The invention discloses a film bulk acoustic resonator and a filter. The film bulk acoustic resonator comprises a substrate; the substrate comprises a sound reflecting layer; the first electrode is positioned on one side of the substrate; the piezoelectric layer is located on the side, away from the substrate, of the first electrode; the second electrode is located on the side, away from the substrate, of the piezoelectric layer; the first electrode, the piezoelectric layer and the second electrode are overlapped in an effective working area along the thickness direction of the film bulk acoustic resonator; the at least one temperature compensation layer is located between the substrate and the second electrode, and the temperature compensation layer and the effective working area are overlapped in the thickness direction of the film bulk acoustic wave resonator; the temperature compensation layer comprises a plurality of independently arranged temperature compensation structures. By adopting the technical scheme, the temperature drift can be reduced and the performance of the resonator can be improved by arranging the plurality of independently arranged temperature compensation structures, and the working frequency of the resonator can be adjusted by adjusting the area and the thickness of the temperature compensation structures.

The air-pulse generating device comprises a film structure, operating at an ultrasonic operating frequency, and a resonant chamber, formed on a side of the film structure. A resonance is formed within the resonance chamber. Due to the resonant chamber, the APG device has a peak on a frequency response of an acoustic property of the APG device at the ultrasonic operating frequency.

The invention discloses a design optimization method of a radio frequency power amplifier, and relates to the technical field of design optimization. The method comprises the following steps: collecting the working frequency and the circuit topological structure of the radio frequency power amplifier, establishing a digital twin simulation model, and generating an initial impedance value; simulation performance indexes of the amplifier under the input signal are obtained through simulation; matching network parameters are adjusted according to a dynamic reconstruction matching network algorithm, and a dynamic optimization impedance set is generated; controlling the tunable element to reconstruct the actual impedance value of the radio frequency power amplifier, and collecting the actual performance index of the output signal; comparing an error between the simulation performance index and the actual performance index, and if the error exceeds a preset error threshold, iteratively updating a parasitic parameter of the digital twinborn model; and if the error is within the threshold value, locking the actual impedance value as the optimal configuration, and amplifying and outputting the input signal. The working efficiency of the radio frequency power amplifier is improved.

The invention discloses an efficient variable-frequency low-temperature compressor system and a compression method thereof. The method comprises the steps that the actual oil-gas separation efficiency is obtained; inputting the working condition parameters of the compressor into a preset neural network prediction model to obtain an oil-gas separation efficiency prediction value and a theoretical solubility reference value; according to the actual oil-gas separation efficiency, the oil-gas separation efficiency predicted value and the theoretical solubility reference value, working condition deviation data is calculated, the comprehensive performance of the compressor at different frequency points is evaluated and calculated through an optimization algorithm, and a frequency adjustment curve is generated; according to the frequency adjusting curve, the operation frequency of the compressor is divided into a plurality of adjusting intervals, the operation frequency is adjusted in a stepped mode according to the adjusting intervals, the temperature and vibration parameters of the bearing are monitored in the adjusting process, and frequency adjusting feedback data are obtained; and according to the frequency adjustment feedback data, oil-gas separation efficiency deviation is periodically calculated, and compensation adjustment is conducted on the frequency adjustment curve. According to the technical scheme, insufficient lubrication and energy efficiency reduction of the compressor can be avoided.

The invention provides a chip power consumption control method and device and a storage medium, and relates to the technical field of chip power consumption control, and the method comprises the steps: obtaining a target power consumption value, a current power consumption value and a current frequency value; determining a power consumption difference proportion value according to the current power consumption value and a target power consumption value; according to the current frequency value and the power consumption difference proportion value, obtaining a frequency increase and decrease value which is in positive correlation with the power consumption difference proportion value; determining a target frequency value according to the frequency increase / decrease value and the current frequency value; and adjusting the working frequency and the working voltage according to the target frequency value. The target frequency value meeting the target power consumption value condition can be quickly determined without step-by-step frequency increasing and decreasing, the frequency modulation efficiency can be improved, the performance and the temperature control performance can be improved, the working power consumption can be controlled to be close to the target power consumption value, and the power consumption requirement can be met. And meanwhile, smaller-granularity frequency modulation is realized, and the frequency for giving full play to the performance of the chip is obtained under the limitation of power consumption, so that the utilization efficiency of the performance of the chip is improved.

The invention provides a broadband millimeter wave phased array dispersion effect optimization and adaptive calibration method, and relates to the field of satellite communication. According to the method, a beam pointing error of a millimeter wave satellite communication phased-array antenna caused by a dispersion effect is reduced based on a real-time delay module switched by an optical fiber and an optical switch, and a calibration interval is determined by using a vector average algorithm in combination with working frequency and bandwidth; data obtained after equiphase surface compensation is used as compensation data of a corresponding frequency band to be stored in the antenna, when the antenna works at different frequencies, the pre-stored compensation data in the corresponding frequency band is called according to polarization characteristics, and corresponding resolving phase data of each unit at the current frequency point and pointing direction are superposed to obtain an overlapped resolving phase data; and directional diagram beam pointing under the frequency point is realized. The problem that the antenna beam pointing error is caused by the dispersion of the broadband millimeter wave satellite communication phased-array antenna is solved. According to the method, the beam pointing precision of the millimeter wave satellite communication phased-array antenna is improved, and rapid frequency switching and beam switching are realized.

The invention provides a multi-frequency adaptive unmanned aerial vehicle spectrum detection method and system, and the method comprises the steps: extracting the spatial and temporal distribution characteristics of carbon particle concentration and temperature gradient intensity based on a real-time environment data set, determining the attenuation coefficient distribution of different frequency band signals in a current environment, and obtaining a frequency band sensitivity analysis result; on the basis of a frequency band sensitivity analysis result, identifying a frequency band range which is most seriously influenced, and generating a signal data set which is optimized according to frequency bands; according to the signal data set optimized in different frequency bands, in combination with turbulence energy spectrum distribution and refractive index disturbance intensity, determining a random interference mode of a fire scene turbulence field on unmanned aerial vehicle detection signals and frequency dependence of the random interference mode; and adjusting the working frequency range of the spectrum detection equipment according to the frequency self-adaptive correction propagation path data set, and generating a multi-band collaborative optimization detection parameter set.

The invention discloses a bridge fundamental frequency and deflection influence line synchronous identification method under vehicle-induced excitation, and relates to the technical field of bridge safety monitoring, and the method comprises the following steps: 1, deducing a fundamental frequency analysis formula through a formula, and setting the fundamental frequency analysis formula as an E-VMD method modal analysis cut-off frequency; 2, stripping a dynamic response component in the deflection response, and identifying a bridge operation frequency through FFT (Fast Fourier Transform); 3, taking the operation frequency as a threshold value, and stripping the dynamic response again; and 4, stripping the axle effect to obtain a static deflection influence line. According to the method, the bridge fundamental frequency obtained through indirect identification based on the dynamic response in the vehicle bridge crossing process has high precision, the relative error between the bridge fundamental frequency and the actually-measured bridge modal fundamental frequency is low, tedious steps of traditional modal testing are avoided, and the analysis efficiency is improved.

The invention discloses a directional broadcast multi-band interference suppression method based on dynamic beam forming, and relates to the technical field of computer processing, and the method comprises the steps: S01, synchronously capturing electromagnetic signals of at least two working bands through a heterogeneous band receiving array synchronized by a hardware-level clock; s02, analyzing space parameters of a target signal and an interference source in the electromagnetic signal in real time; s03, constructing a layered adaptive codebook based on the interference dynamic parameters; s04, fusing the target signal parameter and the interference dynamic parameter by adopting a block matrix acceleration algorithm and an orthogonal decomposition technology, and calculating a beam forming weight; s05, executing operation through the multi-band coprocessor; and S06, establishing an interference source azimuth drift prediction model, and setting a trigger threshold as the coverage tolerance angle theta. According to the method, the anti-interference real-time performance is improved by utilizing layered adaptive wave beams, frequency band isolation, super-resolution multi-path identification and block decomposition.

The invention belongs to the technical field of antenna engineering, and particularly relates to an ultra-wide-band low-profile phased-array antenna, which realizes broadband impedance matching characteristics and effectively expands the working bandwidth of the antenna by optimizing a dipole arm structure and introducing a matching branch knot and linear tapered slot composite structure on a radiation unit layer; on the array architecture level, an electromagnetic metasurface technology is adopted, array current distribution is improved through a periodic artificial electromagnetic structure, the active standing-wave ratio is remarkably reduced, the scanning angle of an array is widened, and meanwhile high compression of a system profile is achieved; on the structural design level, a three-dimensional composite structure of a transverse metal floor, a longitudinal radiation layer and a transverse metasurface layer is innovatively constructed, and the overall section height is reduced to 0.137 lambda Low (lambda Low is the lowest working frequency wavelength) through electromagnetic coupling and space folding technologies; in conclusion, the ultra wide band (the relative bandwidth is greater than or equal to 90%) and the low profile (lt; and the method is suitable for a new generation of broadband phased array radar system.

Disclosed are techniques for wireless communication. In an aspect, a wireless communication device may transmit a first reference signal. The wireless communication device may receive a second reference signal that is in response to the first reference signal, the first reference signal and the second reference signal having a same operating frequency. The wireless communication device may determine a first channel impulse response based on the first reference signal and the second reference signal. The wireless communication device may generate a measurement report for output, the measurement report including a reported channel impulse response that is based on the first channel impulse response and indicates multiple propagation paths observable from the second reference signal.

The invention aims to provide a broadband circularly polarized antenna loaded with a novel coupling structure, and belongs to the technical field of circularly polarized antennas. The antenna comprises a radiation structure, a supporting structure, a coaxial feed structure and a reflecting plate, wherein the radiation structure comprises a parasitic radiation patch, a cross dipole antenna and a radiation dielectric substrate; by innovatively designing the parasitic radiation patch, the bandwidth of the circularly polarized antenna can reach 53.3% when the circularly polarized antenna is in the working frequency band of 1.046-1.846 GHz, and the maximum gain of the circularly polarized antenna can reach 7.3 dB.

The invention relates to an ultrasonic cleaner control method and device and a storage medium, and is applied to the technical field of ultrasonic cleaners, and the method comprises the steps: collecting the working state parameters of a transducer in real time, achieving the precise calculation of the output power and the phase angle based on the working state parameters, and achieving the precise monitoring of the output response of the transducer, meanwhile, the output power and the phase angle are compared with preset conditions, so that whether the current working frequency is the optimal resonant frequency in the current environment or not is determined, if not, the current working frequency is updated until the system operates according to the optimal resonant frequency in the current environment, and the system operates according to the optimal resonant frequency in the current environment. Therefore, it is ensured that the ultrasonic cleaning equipment always operates at the optimal frequency, and the cleaning efficiency and effect are remarkably improved. And meanwhile, dynamic adjustment of the duty ratio is realized by dynamically adjusting the dead zone time, so that time-sharing staggered output of two paths of signals is realized, the working time of the power supply system is shortened, and the pressure of the power supply system is reduced.

A system having the low frequency RF generator is described. The low frequency RF has an operating frequency range between 10 kilohertz (kHz) and 330 kHz. The low frequency RF generator generates an RF signal. The system further includes an impedance matching circuit coupled to the low frequency RF generator for receiving the RF signal. The impedance matching circuit modifies an impedance of the RF signal to output a modified RF signal. The system includes a plasma chamber coupled to the RF generator for receiving the modified RF signal. The plasma chamber includes a chuck having a dielectric layer and a base metal layer. The dielectric layer is located on top of the base metal layer. The dielectric layer has a bottom surface, and the base metal layer has a top surface. The base metal layer has a porous plug and the bottom surface of the dielectric layer has a portion that is in contact with the porous plug.

The present invention relates to multi-stake underwater transducers and arrays for the generation and reception of sound waves in water. The invention provides the design and fabrication of compact piston-type underwater transducers of low-to-mid operating frequency made of piezoelectric single crystals without the need of any pre-stress mechanism. The invention uses a multi-stake pipe-like motor section made of piezoelectric single crystals of high transverse mode piezoelectric coefficients and low acoustic impedance, and small-diameter and light head mass(es). The present invention also discloses various means of increasing the bandwidth of the multi-stake underwater transducers as well as derivative transducers and arrays made of them, including compact 2D and 3D omni-directional transducers, planar, conforming and shaped arrays of various designs, high-density arrays and low-drop-down-ratio parametric arrays of either single or dual frequency bands.

The invention discloses a dust removal fan frequency conversion control method and related equipment, and relates to the technical field of video control. The method comprises the steps that a training data set is generated based on historical video data of an iron notch area in the blast furnace tapping process; constructing an initial artificial intelligence model, and training the initial artificial intelligence model by adopting the training data set to obtain a target artificial intelligence model representing a mapping relationship among the dust concentration, the spark intensity and the fan frequency; based on the target artificial intelligence model and the current dust concentration feature and the current spark intensity feature in the current video data, the target fan frequency of the current tapping stage is determined; and generating a control signal based on the target fan frequency so as to adjust the operation frequency of the dust removal fan frequency converter through the control signal.

The invention belongs to the technical field of hydraulic transmission and control, and discloses a high-precision positioning control method and system of a servo electro-hydraulic actuator. Real-time operation parameters of a servo electro-hydraulic actuator under different working frequencies are obtained, a servo valve dynamic return difference characteristic curve is constructed, a return difference characteristic change mode is extracted, and a dynamic influence model of return difference characteristic change on positioning precision is established. Based on the model, a frequency self-adaptive compensation strategy is designed in combination with a pressure fluctuation value of a hydraulic system, and real-time correction of a servo valve control signal is achieved. According to the method, a differentiation strategy combining low-frequency feed-forward compensation and high-frequency feedback compensation is innovatively adopted, a smooth transition mechanism is designed, and the problem that the positioning precision fluctuates under the frequency change working condition in a traditional control method is solved. According to the invention, high-precision positioning control of the servo electro-hydraulic actuator in a full frequency band range is realized, and the positioning precision and stability of the system under a dynamic working condition are improved.

The invention belongs to the technical field of maritime wireless communication. The invention provides an evaporation waveguide and scatter communication mode discrimination method based on measured data. According to the embodiment of the invention, the method comprises the steps: setting a threshold value of a difference between a troposphere scattering path loss simulation value of a troposphere propagation prediction model and an actual measurement path loss average value according to the parameters, such as a communication distance, a working frequency, a transmitting antenna gain and a receiving antenna gain; and according to an evaporation waveguide and troposphere scatter communication mode discrimination criterion, a current offshore beyond visual range communication mode is accurately discriminated. According to the method, the maritime beyond-visual-range communication system can fully utilize the evaporation waveguide to reduce the power consumption of the communication system or improve the communication rate, and key technical support can be provided for performance improvement of the maritime beyond-visual-range communication system.

The invention provides a frequency modulation and phase shift hybrid modulation method for high-frequency LLC and a related device, which are applied to an LLC resonant converter and comprise the following steps: setting initial parameters of the LLC resonant converter; different system working frequencies are selected; for each system working frequency, determining a required phase shift angle according to a load demand and the system working frequency; and then judging whether the gain of the converter can meet the load requirement under the phase-shifting angle and the frequency, if not, adjusting the phase-shifting angle until the load requirement is met, and if so, taking the phase-shifting angle as a parameter combination. And then calculating system loss under parameter combinations corresponding to different frequencies, and finally selecting the combination with the minimum loss as a modulation parameter basis. The phase shift control is added on the basis of the traditional frequency modulation strategy, the output voltage can be accurately controlled without changing the topology of the converter, the influence of a dead zone under high frequency on the system is reduced, the optimal working point is determined through the balanced frequency modulation and phase shift strategy, the system loss is minimized, and the operation efficiency is improved.

The invention provides a multi-phase clock generator which outputs N injection current signals corresponding to different phases by processing an input clock signal, N is an integral multiple of 4, and a cross-coupled loop is arranged in a cross-coupled ring oscillator. The loop is respectively coupled with output nodes in N / 4 secondary ring oscillators based on a phase sequence, and the secondary ring oscillators realize high-working-frequency and high-stability oscillation frequency output and low-error phase alignment through a cross coupling mechanism, so that the secondary ring oscillators can output N oscillation clock signals with equally-spaced phases, and the phase alignment is realized. Since the injection current signal is input into each output node in the secondary ring oscillator based on the phase sequence, the frequency and the phase of the secondary ring oscillator are locked, the frequency is the same as the frequency of the input clock signal, and the phase noise is very low, so that the frequency and the phase of the secondary ring oscillator are locked. According to the invention, a high-speed multi-phase clock signal with low phase noise and high phase precision can be generated.

The invention discloses a gearbox noise monitoring method, and mainly relates to the field of noise monitoring. Comprising the steps that a plurality of acoustic sensors are installed at preset positions around the gearbox, the acoustic sensors are arranged in the mode that the main noise radiation area of the gearbox can be covered, the sensors have the broadband response characteristic and can collect noise signals with the frequency range from [X] Hz to [Y] Hz, and X and Y are specific numerical values determined according to the working frequency range of the gearbox. The method has the beneficial effects that the high-sensitivity acoustic sensors are reasonably arranged around the gearbox, and the advanced signal processing and feature extraction technology is applied, so that tiny changes in noise signals can be caught acutely. The changes are often closely related to potential faults such as initial wear of a gear, early fatigue of a bearing, poor meshing and the like.

The invention is applicable to the technical field of magnetic field measurement, and provides a current sensor magnetic field measurement method based on a tunneling magnetoresistance effect, which comprises the following steps of: analyzing a real-time output signal through a machine learning algorithm based on a mapping relation model of a parasitic capacitance parameter and a signal characteristic of a tunneling magnetoresistance sensor circuit; determining an actual value of a parasitic capacitance parameter; controlling a negative capacitance generation circuit and a numerical control resistance network to adjust an equivalent negative capacitance value and a resistance value according to the actual value of the parasitic capacitance parameter, and generating a matched compensation parameter set; feature extraction is carried out on the compensated signal, and an effective magnetic field component is obtained through multi-resolution time domain decomposition and phase consistency detection; calculating the magnetic field intensity and the change gradient based on the effective magnetic field component, and determining the effective working frequency range of the sensor according to the signal attenuation characteristic; and dynamically adjusting a compensation strategy according to a comparison result of the effective working frequency range and a preset target frequency band, and reducing measurement errors.

The invention belongs to the technical field of antennas, and particularly relates to a low-sidelobe X-waveband waveguide slot array antenna. The antenna comprises an antenna array plane, the antenna array plane comprises a plurality of sub-array antennas which are arranged in parallel at equal intervals, each sub-array antenna is a waveguide slot array antenna, each waveguide slot array antenna is externally connected with a TR assembly, and the center-to-center distance d1 between every two adjacent waveguide slot antennas is 16mm; according to the technical requirements, horizontal polarization is achieved in the mode that an inclined slot is formed in the narrow side of a rectangular waveguide, finally, the design of the low-sidelobe horizontal polarization waveguide slot traveling wave array antenna is achieved, and the sidelobe level in the antenna working frequency range averagely meets the design target that the sidelobe level of a transmitting pitching face is lower than-12dB, the sidelobe level of a receiving pitching face is lower than-25dB, and the sidelobe level of the receiving pitching face is lower than-25dB. According to the invention, the side lobe level of the azimuth plane is lower than-25dB, the normal transmitting gain is greater than 35dBi (full-band), the receiving gain is greater than 33.5 dBi, and the antenna has the advantages of low side lobe, high gain and narrow beam, and is suitable for being applied to an X-band radar communication system.

The invention relates to a wireless power transmission system parameter identification method based on a time domain differential model, and belongs to the technical field of wireless power transmission system control. The method comprises the following steps: establishing a parameterized time domain dynamic physical model; collecting system dynamic response data; constructing an optimization target based on a time domain residual error; and performing optimal parameter estimation based on iterative optimization. According to the method, a time domain dynamic physical model of a wireless power transmission system is constructed, and unknown parameters are solved through an iterative optimization algorithm with a minimum waveform matching error as a target. According to the algorithm, in an iteration process, a physical model is called to carry out forward differential equation solution, a time domain residual error between a model solution current and a real measurement current is used to drive a parameter estimation value to converge, and finally high-precision and high-robustness wireless power transmission system parameter identification under any working frequency is realized. The problem that in the prior art, due to static stiffness and sensitivity to waveform distortion of a theoretical model, the identification precision is insufficient is effectively solved.

Systems, apparatus and methods are described for dynamic demodulation signal resource allocation. PDSCH / PUSCH DMRS enhancement is provided. A dynamic indication of reference signal functionality may be provided in a slot for an additional DM-RS. A configured CSI-RS / SRS may be dynamically indicated to use as an additional DM-RS in a slot. Frequency shift / hopping of DM-RS as a function of OFDM symbol and / or the order of OFDM symbol containing DM-RS may increase frequency density within a slot. DM-RS antenna port aggregation may increase DM-RS frequency density. One or more DM-RS antenna ports may be used to demodulate the same layer. PDCCH DMRS enhancement is provided. Frequency shift / hopping of PDCCH DMRS may be provided as a function of a REG index within an REG bundle, OFDM symbol index, etc. Use of multiple types of REG (e.g., low and high DM-RS) and REG type may be determined based on subcarrier spacing, operating frequency band, etc.

The invention provides a processing device and a processing method, and the processing device is provided with a frequency modulation processing part connected with a system clock part, and obtains the system clock frequency of the operation of the processing device and the execution information of a to-be-executed instruction, and the execution information can represent the working data of the processing device executing the corresponding to-be-executed instruction. According to the technical scheme, when it is determined that the system clock frequency and the execution information of the to-be-executed target instruction meet the preset frequency modulation condition, the currently output system clock frequency can be gradually adjusted to the target working frequency according to the corresponding frequency modulation mode, so that the processing equipment operates at the target working frequency to execute the corresponding to-be-executed target instruction.