303 results about "Cutoff frequency" patented technology

The invention relates to the technical field of data center dynamic modeling, and discloses a twin model dynamic modeling method for a data center DCIM platform, which comprises the following steps: constructing a discrete state space model containing a thermal coupling matrix and a system matrix, collecting real-time power and temperature time sequence data, and calculating a cross-correlation function to lock hot air dynamic transmission lag time; calculating cut-off frequency based on physical attributes of the cabinet and decomposing data into high and low frequency components by using a complementary filter; according to the method, the model parameters are made to return to a physical source through a frequency domain decoupling mechanism, the problem of aliasing of airflow coupling and structural thermal inertia parameters in a traditional single-scale identification method is solved, and the method is suitable for large-scale identification. And the physical authenticity and prediction robustness of the twin model under a complex working condition are improved.

The invention discloses a method for improving the stability of a system for sending out deep and far sea wind through a dual-port light converter. The method comprises the following steps: introducing a voltage feed-forward path comprising a phase compensator and a low-pass filter into an MMC differential mode control loop in the dual-port light converter; and a compensator parameter feasible region is calculated based on the phase characteristics of the oscillation risk frequency band, and the cut-off frequency of the filter is set, so that targeted phase compensation and impedance remodeling are realized, and the damping of the dual-port light converter is effectively enhanced. According to the method, the impedance characteristic of the dual-port light-weight current converter in the oscillation risk frequency band is remarkably improved, and a reliable technical path is provided for improving the stability of the dual-port light-weight current converter.

The invention relates to the technical field of converter analysis, in particular to a converter transient stability analysis method and system considering HPFR structure influence. The method comprises the steps that an HPFR structure is considered, and a transient response large disturbance dynamic model of a virtual synchronous generator under large disturbance is constructed; based on the constructed transient response large-disturbance dynamic model, analyzing the transient stability of the system by adopting an extended equal-area method to obtain a VSG dynamic response characteristic jointly influenced by a gain coefficient and a cut-off frequency in a speed regulation link; based on VSG dynamic response characteristics, a phase diagram analysis method is adopted to evaluate a gain coefficient and a cut-off frequency in a speed regulation link, and a value interval of the gain coefficient and the cut-off frequency in the speed regulation link is obtained; and optimizing a gain coefficient and a cut-off frequency in a speed regulation link of the virtual synchronous generator, so that a power angle value of the system is smaller than a power angle value of the system tending to be unstable under a fault condition. The method has the characteristics of high analysis precision, difficulty in conservative judgment result and the like.

The invention provides an eddy current sensor signal noise reduction method based on frequency division detection low-pass filtering and a monitoring system, belongs to the technical field of sensor signal processing, and can at least partially solve the problems of unstable signals and inaccurate measurement in the prior art. The signal noise reduction method for the eddy current sensor comprises the following steps: processing an original output signal of the eddy current sensor by adopting a synchronous detection module, demodulating a dynamic vibration alternating current component of the original output signal into a direct current voltage signal by utilizing a reference signal, and separating a static displacement direct current component signal; an independent dynamic signal channel and an independent static signal channel are formed; filtering high-frequency noise in the dynamic signal channel through a dynamic channel low-pass filter with a first preset cut-off frequency, and filtering power frequency interference in the static signal channel through a static channel low-pass filter with a second cut-off frequency; and reversely injecting compensation voltage at the output end of the static channel low-pass filter so as to eliminate the direct-current offset error of the static displacement component signal.

The invention discloses an electric meter sampling filter chip and system integrated with a programmable anti-aliasing filter, and relates to the field of electric energy metering chips, the electric meter sampling filter chip comprises a programmable anti-aliasing filter module, a digital control and interface module and a cooperative control unit, through binary weighted control of a switched capacitor array, the cut-off frequency can be dynamically adjusted within the range of 1 kHz to 100 kHz, and the cut-off frequency can be adjusted within the range of 1 kHz to 100 kHz. Switching of a Bessel mode, a Butterworth mode and a Chebyshev mode is physically achieved by reconstructing a feedback network, a programmable AAF, an ADC, control logic and a digital interface are integrated into a single chip, and the number of external elements such as an RC network and an operational amplifier is reduced; aDC sampling data is analyzed through FFT, the signal-to-noise ratio is calculated in real time, the filter mode is automatically switched, a hardware interrupt pin triggers notification after configuration is completed, MCU polling is replaced, and frequency response is ensured to be accurate and controllable through laser trimming of a switched capacitor array.

The application discloses a local discharge signal processing method and device under high-frequency square wave voltage, wherein the method comprises the following steps: filtering low-frequency noise signals of a test power supply by using a high-pass filter with a preset cutoff frequency, wherein the test power supply is a high-frequency square wave power supply for local discharge test of an insulation sample; obtaining a local discharge starting voltage of the insulation sample, collecting a local discharge signal when a test voltage is the local discharge starting voltage, obtaining a characteristic frequency band of local discharge of the insulation sample according to the local discharge signal, and the test voltage is a high-frequency square wave voltage of the test power supply; performing modal decomposition on the local discharge signal of the characteristic frequency band to obtain a plurality of modal components, selecting a plurality of modal components satisfying a preset condition to perform noise reduction processing and signal reconstruction, and obtaining a denoised local discharge signal of the insulation sample under the high-frequency square wave voltage. The application can avoid interference of the high-frequency square wave power supply on the local discharge signal, and obtain a local discharge signal with high signal-to-noise ratio under the high-frequency square wave voltage.

The invention discloses a jitter suppression method and system for an AGV. The method comprises the steps that a rotor speed signal and a torque instruction signal of a permanent magnet synchronous motor of the AGV are collected; performing discretization sampling on the rotor speed signal to obtain a discrete speed signal; performing spectral analysis on the discrete speed signal to extract a corresponding vibration spectrum, and obtaining a main frequency point where resonance occurs; inputting the discrete speed signal into a high-pass filter to extract a component required by active damping suppression of a vibration frequency point, carrying out discretization differential on the discrete speed signal to obtain an acceleration signal, and carrying out band-pass filtering on the acceleration signal by adopting a band-pass filter to obtain a component required by acceleration feedback suppression; the cut-off frequency of the high-pass filter and the center frequency and bandwidth of the band-pass filter are determined by main frequency points; and a compensation torque signal is obtained according to the jitter component and the component required for acceleration feedback suppression, so that jitter caused by resonance of the AGV is suppressed according to the compensation torque signal.

The invention discloses a rectangular waveguide circuit board preparation method and a circuit board, and belongs to the technical field of circuit board manufacturing. The preparation method comprises the steps of providing upper and lower substrates of a circuit board; preparing a rectangular groove base material with a rectangular groove based on a preset requirement; an upper limit cut-off frequency wavelength is obtained according to the rectangular groove parameters, then the aperture, the hole pitch, the hole position and the arrangement constraint are obtained, and medium hole design data are determined; medium holes are formed in the upper and lower base materials according to the data to obtain upper and lower hole base materials; pressing the three parts to obtain a substrate with a rectangular cavity; and electroplating liquid medicine is injected through the medium hole, so that the inner wall of the cavity is metalized to obtain the rectangular waveguide circuit board. According to the invention, conventional processing is realized, the cost and the process complexity are reduced, the cavity reliability is improved, the PCB manufacturing technology is compatible, and the high-frequency transmission performance and the processing yield are ensured.

The application discloses a protection and distortion control method and system during sound operation, and relates to the technical field of audio processing. An audio signal and a reference signal are acquired; the reference signal is preprocessed to obtain a trigger signal of a level effective value; a trigger threshold is acquired according to the trigger signal of the level effective value; the trigger threshold is adjusted to obtain a preset trigger threshold; the preset trigger threshold is dynamically adjusted according to a voltage value corresponding to a frequency of the audio signal to obtain a voltage value corresponding to the preset trigger threshold; and the audio frequency corresponding to the voltage value corresponding to the preset trigger threshold is a protected and distortion-controlled audio signal. The application realizes dynamic change of a high-frequency cutoff frequency of an audio high-frequency unit while maintaining the loudness of a sound field restoration of a sound system, and improves the protection and distortion control accuracy of the sound in a limit operation state of high power and long time.

The invention provides an anti-pinch method and device for an electric sunshade curtain, a storage medium and an electronic device.The method comprises the steps that the electric sunshade curtain is started, and a first current signal of a driving motor of the electric sunshade curtain is collected; obtaining a first high-pass filtering signal and a first low-pass filtering signal of the first current signal passing through a low-pass filter; judging whether the electric sunshade curtain is in an anti-pinch state or not according to the first high-pass filtering signal and the first low-pass filtering signal; if the electric sunshade curtain is in the anti-pinch state, the driving motor is controlled to drive the electric sunshade curtain to rotate reversely to the full-open position. According to the embodiment of the invention, the current signal of the motor is detected, and anti-pinch identification is carried out according to the fact that the current signal passes through the high-pass filtering signal with the high cut-off frequency and the low-pass filtering signal with the low cut-off frequency, so that the interference of motor voltage and environment temperature is reduced, and the adaptive capacity of an anti-pinch scene is improved; the technical problem that in the prior art, an electric sunshade curtain cannot accurately recognize the anti-pinch state is solved.

The invention relates to the technical field of electronic circuits and communication, and discloses an ultra-wide-band low-insertion-loss conical inductor which comprises a conical magnetic core, a cylindrical magnetic core is fixedly connected to the conical magnetic core, a first enameled wire is wound on the surface of the conical magnetic core, a second enameled wire is wound on the surface of the cylindrical magnetic core, and the first enameled wire and the second enameled wire are wound on the surface of the cylindrical magnetic core. The first enamelled wire and the second enamelled wire are connected in series. Compared with a conical inductor with the same number of turns and the same taper angle, the ultra-wideband low-insertion-loss conical inductor provided by the invention is smaller in size; compared with a conical inductor with the same number of turns and the same taper angle, the low-frequency cut-off frequency is lower, and the insertion loss curve is more stable in the working frequency band.

The invention discloses a design method of a three-order active filtering automatic test system, and the method comprises the steps: controlling a PXI platform through LabVIEW programming to achieve the generation of a sweep frequency signal and the collection of filtering response, and completing the signal processing, characteristic analysis and result visualization. The system integrates six core technologies, namely a modularized hardware architecture, automatic process control, frequency domain parameter precision measurement, multi-order characteristic synchronous detection, software and hardware collaborative linkage and simulation data comparison. On the basis of retaining traditional functions such as setting waveform type, amplitude, sweep frequency range, sampling rate, trigger mode, recording cut-off frequency, gain and other parameters, exponential sweep frequency accurate excitation and adaptive signal acquisition are innovatively realized, link interference is reduced through matrix switch multi-channel scheduling, a LabVIEW parallel thread and a feedback node mechanism are combined, and the adaptive signal acquisition is realized. And closed-loop analysis of amplitude-frequency / phase-frequency characteristics and real-time drawing of a Bode diagram are completed.

The invention discloses a seaplane wave sliding load spectrum compilation method. The method comprises the steps of determining gravity center acceleration data of pool test data of each task section according to overall and structural parameters of a seaplane; comparing a gravity center acceleration time history curve representing the gravity center acceleration data with an airframe trim angle time history curve, and intercepting stable section data of each task section; performing power spectrum density analysis on acceleration overload / overload increment in the stable section data to obtain an acceleration characteristic frequency band; determining a cut-off frequency according to the acceleration characteristic frequency band, and filtering the stable section data; carrying out accumulated transcendental statistics on the filtered stable section data to obtain an accumulated transcendental curve of each task section; according to the time proportion of each task segment and the similarity criterion, obtaining an accumulative surpassing curve of each task segment of the real machine water surface operation; and forming a body wave sliding equivalent spectrum according to a damage equivalence criterion. The technical problem of compiling and verifying the water skiing fatigue load spectrum of the seaplane is solved.

The invention discloses an ultra-wideband small radio frequency antenna for PE pipe detection, and relates to the technical field of antennas. The antenna comprises an insulating medium substrate and a radiation structure arranged on the front surface of the insulating medium substrate. The radiation structure comprises a main radiation patch formed by an index gradual change slot line, an annular patch arranged at an interval with the tail end of the main radiation patch, and a strip-shaped patch arranged at an interval with the annular patch. The resistor element comprises a first resistor, a second resistor and a third resistor, and the main radiation patch is connected with the annular patch through the first resistor; a radiation part of the antenna forms a specific resistance loading network through a radiation structure and a resistance element, and a slot line feed structure feeds energy, so that resonance with lower frequency can be effectively excited, and the low-frequency cut-off frequency of the antenna is reduced, which is crucial for detecting a deep target; therefore, the input impedance of the antenna is very stable in the whole ultra-wideband, the energy transmission efficiency is ensured, and the gain and efficiency of the antenna are gradually increased.

The invention provides a microphone open circuit detection method, system and device and a medium, and the method comprises the steps: enabling an original audio to pass through a preset filter, and obtaining a target filtering audio; wherein the preset filter comprises a preset high-pass filter taking a first frequency as a cut-off frequency and a preset low-pass filter taking a second frequency as the cut-off frequency; determining a current decibel according to the target filtering audio; and determining a microphone open circuit state corresponding to the original audio according to the current decibel and a decibel threshold. Through the technical scheme of the application, the effect of detecting the open circuit state of the microphone without additionally adding hardware equipment is realized.

The invention relates to the technical field of digital signal processing and power amplification, and discloses a power optimization method for high-power pulse amplification based on digital preprocessing. Pulse voltage is sampled and normalized into unit energy discrete pulse signals, frequency domain transformation is carried out under a unified energy reference, and frequency point amplitudes and phases are extracted to form a frequency spectrum sequence; establishing a frequency response model according to the cut-off frequency of the power amplifier to obtain an amplitude gain coefficient, constructing a pre-compensation function comprising an amplitude pre-compensation factor and a phase compensation amount changing along with the frequency, acting on a frequency spectrum sequence, and performing inverse transformation to form a pre-compensation time domain signal; after a power amplifier is input, an output frequency spectrum is reconstructed and inversely transformed to obtain an output time domain signal, peak power and frequency spectrum energy fidelity are calculated, power normalization is performed when the fidelity meets a threshold value, and a transmitting system is accessed, so that the problems of difficult compensation unification and frequency spectrum distortion are solved, and target power output is realized on the premise of ensuring frequency spectrum fidelity.

The invention relates to the technical field of electronics, and discloses intelligent wearable equipment and a watchband identification method thereof. The intelligent wearable device comprises a watchband and a watch body. An SOC for providing an excitation end and an acquisition end is arranged in the meter body; an oscillating circuit is arranged in the watchband, the input end of the oscillating circuit is used for being electrically connected with the excitation end, the output end of the oscillating circuit is used for being electrically connected with the acquisition end, and the oscillating circuit is provided with a parameter combination used for forming a target cut-off frequency corresponding to the type of the watchband; the SOC is used for generating a sweep frequency excitation signal when a watchband insertion event is detected; and extracting an amplitude attenuation curve output by the oscillating circuit, determining a corresponding target cut-off frequency according to the amplitude attenuation curve, and identifying the type of the currently inserted watchband according to a determination result and a mapping relationship between a preset cut-off frequency and the type of the watchband. According to the embodiment of the invention, the method is realized by multiplexing the resources of the SOC, and the purchase cost and layout space occupation of additional devices are avoided; and the design complexity can be effectively reduced, and the research and development debugging time and cost are reduced.

The invention discloses a power system oscillation parameter identification method based on improved TVF-EMD, and the method comprises the steps: carrying out the preprocessing of an original PMU data stream, calculating a local cut-off frequency LCF through B-spline approximation, solving a signal local mean value through B-spline approximation, completing the time-varying filtering empirical mode decomposition, namely TVF-EMD decomposition, screening an effective IMF based on a correlation coefficient after the verification of a stop criterion, and carrying out the recognition of the oscillation parameter of a power system. Extracting an instantaneous frequency and a damping ratio through the TKEO; the method combines TVF-EMD with TKEO, can accurately estimate the modal parameters of the power system under the normal operation condition, including frequency and damping ratio, has robustness for the instantaneous mode characteristics in the power system under the condition of low calculation complexity, reduces the problems of modal aliasing and discontinuity easily occurring in the traditional EMD method, and improves the reliability of the power system. The method provides better performance in the aspects of predefined parameters and time-varying cut-off frequency, and is suitable for analysis of non-stationary signals.

The application discloses a kind of ultra-wideband small radio frequency antennas for PE pipe detection, it is related to antenna technical field;The application includes insulating dielectric substrate and the radiation structure of setting in insulating dielectric substrate front, the radiation structure includes the main radiation patch of being formed by exponential gradually changing slot line, ring patch is arranged at the end of main radiation patch interval, and strip patch is arranged at interval with ring patch;Resistance element includes first resistance, second resistance and third resistance, and main radiation patch is connected with ring patch by first resistance;The radiation part of the antenna of the application forms specific resistance loading network by radiation structure and resistance element, slot line feed structure feeds energy, and can effectively stimulate lower frequency resonance, reduce the low frequency cutoff frequency of antenna, which is crucial for detecting deep targets, so that the input impedance of the antenna is very stable throughout the ultra-wide frequency band, ensuring energy transmission efficiency, antenna gain and efficiency are gradually increased.

The invention discloses a steep transition type artificial surface plasmon low-pass filter based on a spur line structure, and belongs to the technical field of low-pass filters, the steep transition type artificial surface plasmon low-pass filter comprises a dielectric substrate, a coplanar waveguide is arranged on the upper surface of the dielectric substrate, and a spur line unit array is arranged on the lower surface of the dielectric substrate; the coplanar waveguide comprises a center conductor belt and grounding belts symmetrically distributed on the two sides of the center conductor belt, L-shaped groove unit arrays are etched on the grounding belts, the L-shaped groove unit arrays are distributed in the length direction of the coplanar waveguide, and each L-shaped groove unit array comprises a filtering unit and transition units symmetrically arranged at the two ends of the filtering unit. The spur line unit array is aligned with the center of the filtering unit on a projection plane perpendicular to the wave propagation direction. According to the steep transition type artificial surface plasmon low-pass filter based on the spur line structure, adjustable dispersion cut-off frequency and sharp transition from a pass band to a stop band are achieved, and meanwhile the structure is simple and miniaturized.

The invention provides a sound and vibration combined turn-to-turn short circuit monitoring method and system for a dry-type air-core reactor, electronic equipment and a storage medium, and the method comprises the steps: synchronously collecting multi-source sound signals and vibration signals of a bone conduction pickup, a microphone at a specific position and a vibration acceleration sensor through a multi-mode data collection module; after uncorrelated Gaussian white noise is added to the collected signals for multiple times, EMD decomposition is carried out, M times of same-order IMF component arithmetic averaging is carried out to obtain multiple groups of IMF components, effective IMF components are screened in combination with a joint criterion of a physical consistency coefficient and an adaptive cut-off frequency, fault sensitive features are extracted through phase perception adaptive synchronous compression transformation and iterative phase verification and reconstruction, and fault detection is carried out on the fault sensitive features. And then taking normal state feature distribution as a reference, introducing a physical weight coefficient related to a fault mechanism to complete feature standardization, finally training a special expert model and an intelligent gating unit through a subdivided sample, allocating weight aggregation according to the verification accuracy of the expert model, and outputting a diagnosis result.

A microwave filter includes a superconductor-to-insulator transition (SIT) layer including a material exhibiting a superconductor-to-insulator transition associated with a superconducting gap frequency. For signals transmitting through the layer, the microwave filter is a low-pass filter in which twice the superconducting gap frequency is a cutoff frequency.

The application discloses a kind of ultrasonic thickness extraction methods based on wavelet compression energy estimation, it is related to ultrasonic thickness measurement technical field, comprising the following steps: S1, the first ultrasonic signal of time domain ultrasonic wave is obtained, and its power spectral density is calculated;S2, the total energy of first ultrasonic signal and the cumulative energy distribution under different cut-off frequencies are calculated, and the filter band is found out;S3, wavelet change is carried out, and the first time-frequency diagram is established;S4, according to the filter band, the first time-frequency diagram is filtered, and the second time-frequency diagram is obtained, the first ultrasonic signal is reconstructed, and the second ultrasonic signal is obtained;S5, the second time-frequency diagram is segmented according to energy, and the position of ultrasonic echo is calculated, and finally the thickness is calculated.The present application can quickly find the center frequency and effectively process filtering when facing larger wave packet, through wave packet energy cutting, find small specific envelope, combined with autocorrelation or same single wave packet cross-correlation, solve the problem of wave packet dispersion caused by the roughness change of reflecting surface.

A switching circuit outputs a modulated signal. A low-pass filter circuit receives the modulated signal and applies low-pass filtering processing at a low-pass cut-off frequency to generate a demodulated signal to a load impedance. A replicating circuit receives the modulated signal and applies a replica of the low-pass filtering processing of the low-pass filter circuit to generate a reference signal. A signal processing circuit applies signal processing to the demodulated signal and the reference signal to generate at least one indicator signal which is indicative of a variation of the low-pass cut-off frequency.

Various current measurement systems and methods of signal processing are disclosed. In one example, there is a current measurement system that includes a filter with a corner frequency within the operating frequency range of the current measurement system. This provides a system with good SNR, whilst also preventing or reducing the likelihood of output saturation during large di / dt spikes. The system further includes an equaliser arranged to compensate for the phase and / or magnitude response of the filter within the operating frequency range.

Method in an electrical audio signaling circuit comprising a feedback loop (280) with a digital filter (285) coupled to a current-to-digital-to-analog converter (240, 320), the method comprising: providing (560, 625) an output signal from the current-to-digital-to-analog converter (240, 320) to analog elements of the electrical audio signaling circuit, wherein the output signal from the current-to-digital-to-analog converter (240, 320) is based on a reference signal input to the current-to-digital-to-analog converter (240, 320) while no output from the digital filter (285) is input to the current-to-digital-to-analog converter (240, 320); comparing (565, 630) an output signal of the electrical audio signaling circuit with a reference; and calibrating (570, 635) the electrical audio signal circuit, such that the output signal of the electrical audio signal circuit corresponds to the reference,wherein the calibration of the electrical audio signal circuit enables more precise control of a cutoff frequency of a microphone signal, while the output of the digital filter (285) is input into the current-to-digital-to-analog converter (240, 320).

The invention relates to a real-time digital audio filtering system and an implementation method thereof. The real-time digital audio filtering system is composed of a high cut-off filter bank module, a low cut-off filter bank module, a subtracter module, a sampling rate synchronous interpolator module and a sampling rate converter module. Wherein the high cut-off filter bank and the low cut-off filter bank are respectively composed of a plurality of stages of low-pass filtering units, and each stage of low-pass filtering unit is composed of a plurality of FIR low-pass filters; and the sampling rate synchronous interpolator is used for synchronizing the frequencies of the output signals of the high and low cut-off filter banks. Different bandwidth requirements can be met only by designing a small number of low-pass filters, and bandwidth adjustment is flexible and convenient; the used filters are low-order FIR (Finite Impulse Response) filters, so that the time delay of the system is less, the operand is small, the output signal is linear phase and has no distortion, and meanwhile, the method also has good universality and can be applied to other real-time digital audio systems after the cut-off frequency of the filters is simply adjusted.

The invention discloses a microwave sensor based on SSPP and a movable resonator and a measuring method of the microwave sensor. The microwave sensor is used for simultaneously and independently measuring the dielectric constant and biaxial linear displacement of a material. The sensor adopts a double-layer PCB structure; the lower layer PCB is integrated with an SSPP structure to form a low-pass filter, and the cut-off frequency of the low-pass filter is sensitive to the dielectric constant of a material to be detected; the upper PCB serves as a pure dielectric layer, limits two displacement areas and guides the two sliding blocks embedded with the independent ring resonators to slide. The two ring resonators generate two independent notch frequencies in a passband of the filter, and the reflection phases of the two ring resonators are in linear relation with the displacement of the corresponding sliding blocks respectively. The core of the invention lies in that material sensing and double-displacement sensing are completely decoupled in electromagnetic response and do not interfere with each other, and multi-parameter synchronous measurement on a single compact device is realized; the device can effectively achieve the measurement of the dielectric constant and two independent linear displacements of the material at the same time, achieves the complete decoupling of a sensing signal, and avoids the problems in the aspects of cross sensitivity and the like.

A pitch data processing system of a horizontal directional drilling system can include a sonde, an offset and range calibration unit, a pitch speed limiter, and a low pass filter. The sonde can include an accelerometer configured to measure and output a raw pitch signal. The offset and range calibration unit can receive and process the raw pitch signal and output a calibrated pitch signal. The pitch speed limiter can receive the calibrated pitch signal. The pitch speed limiter is configured to set upper and lower pitch change speed limits. The pitch speed limiter can yield a speed-change limited pitch signal. The low pass filter can receive the speed-change limited pitch signal and attenuate the received speed-change limited pitch signal above a selected cutoff frequency of the low pass filter, the low pass filter configured to output an adjusted pitch signal.

The invention provides a method for extracting high-frequency characteristics of an indium-phosphorus heterojunction bipolar transistor (HBT). The method comprises the following steps: acquiring S parameter test data of InP HBTs with different sizes; extracting element parameters based on the test S parameters and the T-type small-signal equivalent circuit model of the InP HBT; obtaining a forward current gain and a unidirectional power gain under the radio frequency condition; constructing a frequency extraction model; obtaining a cut-off frequency and a maximum oscillation frequency; and constructing a geometric scalable model of the cut-off frequency and the maximum oscillation frequency based on the change rule of the cut-off frequency and the maximum oscillation frequency along with the size of the device. According to the invention, the method for extracting the cut-off frequency and the maximum oscillation frequency is defined by using the test S parameter; through testing under the multi-size and multi-bias condition, the effectiveness of the method is verified, the precision of the model is improved, and meanwhile, the time for extracting the cut-off frequency and the maximum oscillation frequency is greatly shortened.