425 results about "Frequency measurements" patented technology

A frequency measurement method performed by a user equipment (UE) in a wireless communication system is provided. The frequency measurement method includes: receiving a radio resource control (RRC) release message or system information including first frequency measurement configuration information for frequency measurement in an RRC inactive mode; performing frequency measurement in the RRC inactive mode based on the first frequency measurement configuration information; receiving first RRC resume message including an indicator requesting a measurement report in the RRC inactive mode; and transmitting an RRC resume complete message including the measurement report based on the indicator.

The invention provides a self-adaptive algorithm and system for improving frequency measurement precision and response speed of a speed regulator. The method comprises the following steps: Step 1, signal acquisition and preprocessing; step 2, dynamically adjusting filtering parameters, and suppressing power grid signal noise; 3, extracting frequency characteristics in real time, and improving the frequency measurement resolution; 4, a synchronous clock is adopted as a reference frequency source, a clock reference value is periodically and automatically corrected, and long-term drift is eliminated; 5, a nonlinear dynamic model of the hydroelectric generating set is constructed, the nonlinear relation between the valve opening degree and output of the speed regulator is compensated in real time, and the frequency modulation precision is improved; and step 6, outputting the instantaneous frequency. According to the scheme, through the self-adaptive frequency measurement algorithm, high-precision clock calibration, a hardware acceleration mechanism and a nonlinear compensation strategy, a multi-dimensional optimization system is constructed, high-precision frequency measurement is carried out, a rapid effect can be achieved, and a hydroelectric system has long-term stability and high adaptability.

The invention discloses a direct current line pilot protection method and system based on a special frequency measurement impedance property, and the method comprises the steps: 1, calculating a wavelet transformation modulus maximum value of a line mode voltage through employing a wavelet transformation method, and starting protection when the wavelet transformation modulus maximum value meets a protection starting criterion; step 2, the rectification side protection unit and the inversion side protection unit calculate fault components of the line mode voltage and the line mode current in each data window; 3, calculating a real part and an imaginary part of the measured impedance under two specific frequencies; step 4, determining the fault direction by using the fault direction discrimination characteristic quantity and the fault direction criterion; step 5, when the fault directions determined by the rectification side protection unit and the inversion side protection unit are consistent, determining that an internal fault occurs, otherwise, determining that an external fault occurs, and returning to the step 1; and step 6, when the occurrence of the internal fault is judged, calculating a fault pole selection characteristic quantity, and judging a fault type and a fault line according to a fault pole selection criterion, thereby solving the problems that pilot protection is slow in action, high in synchronization requirement and influenced by distributed capacitance.

The invention relates to the technical field of frequency detection, in particular to a frequency measurement method and device based on Kalman filtering, electronic equipment and a storage medium, and the method comprises the steps: obtaining a posterior estimation value of frequency measurement data at a previous moment and an observation value at a current moment; calculating a prior estimation value at the current moment by using the posterior estimation value at the previous moment, calculating an observation error between the prior estimation value at the current moment and the observation value at the current moment, and judging whether the observation error is greater than a preset error threshold value or not; and if the observation error is greater than a preset error threshold value, updating the prior estimation value at the current moment by using a preset Kalman filter, and taking the updated prior estimation value at the current moment as an output value of the frequency measurement data at the current moment. Therefore, the problem that the frequency measurement requirements of complex signal processing, real-time monitoring and quick response to signal change are difficult to meet in the related technology is solved, accurate system state estimation can be provided, and the method has good real-time updating and signal processing capabilities.

The invention provides a microwave superheterodyne frequency sweep measurement system based on Rydberg atoms, and belongs to the technical field of microwave frequency measurement. The laser module excites detection light of 780 nm and coupling light of 480 nm, and the two beams of light are reversely input into the atomic gas chamber through the dichroscope; signal microwaves are generated by a radio frequency signal source and are radiated to the position of the atomic gas chamber through the horn antenna; local oscillation microwaves are generated by the microwave module and are also radiated to the position of the atomic gas chamber through the horn antenna; the atomic gas chamber serves as a mixer to form a difference frequency signal; the spectrum analyzer is used for monitoring low-frequency difference frequency signals generated in the frequency mixing process in real time and recording signal intensity in real time. According to the invention, high-precision and wide-band microwave frequency measurement is realized, continuous and smooth frequency sweeping response can be provided in a frequency range, and absolute frequency detection of microwave signals is realized under the condition that a complex frequency comb technology is not introduced. The hardware architecture is simplified, the automation degree is improved, and integration, popularization and application are facilitated.

The invention discloses a frequency measurement circuit and a frequency measurement method, belongs to the technical field of frequency measurement, and mainly solves the problems that the existing frequency measurement is large in frequency error, low in frequency measurement speed and narrow in frequency measurement bandwidth, and cannot meet the requirements of radar communication. The frequency measurement circuit comprises an FPGA control module, a reference clock circuit connected with the FPGA control module, a DDS frequency output circuit, a phase discrimination frequency control circuit, a frequency mixer connected with the phase discrimination frequency control circuit, and a radio frequency input circuit connected with the frequency mixer. According to the frequency measurement technology, the DDS output frequency is directly collected according to the characteristic that the FPGA collects the low frequency, the DDS output frequency serves as the phase discriminator phase discrimination frequency, frequency measurement is conducted in a phase locking mode, and the frequency measurement precision is high; the phase discriminator is set to have a fixed frequency dividing ratio, the phase discriminator is configured with a fixed register, a DDS frequency sweeping mode is adopted, and the frequency measurement time is short by changing the phase discrimination frequency of the phase discriminator to the output frequency of the phase-locked loop; and the frequency measurement bandwidth is increased by using a radio frequency input frequency division mode.

The invention particularly relates to a miniaturized broadband instantaneous frequency measurement receiver and a corresponding data processing method. The miniaturized broadband instantaneous frequency measurement receiver comprises a signal input port used for receiving an original radio frequency signal; the amplifying and filtering module is used for amplifying and filtering the original radio frequency signal and then outputting a first radio frequency signal; the first power divider is used for splitting the first radio frequency signal and outputting the first radio frequency signal to the multi-channel power division phase discrimination assembly; the multi-channel power division and phase discrimination assembly comprises a plurality of power division and phase discrimination modules and is used for carrying out instantaneous measurement on the signal frequency of the first radio frequency signal and outputting multi-channel video signals; the frequency measurement coding module is used for performing frequency measurement processing on the video signal and outputting a frequency code; wherein the signal input port is connected with the amplification filtering module and the power division phase discrimination module through microstrip lines; the power division phase discrimination module is connected with the frequency measurement coding module through a glass insulator. The size, the volume and the weight of the device all meet the requirement for miniaturization.

The invention provides a frequency conversion sampling system and method, and relates to the technical field of electric power measurement, the system comprises a frequency measurement module, a clock generator module, an ADC module and a main control module, the frequency measurement module converts a measured AC signal into a target level signal; the main control module determines the current frequency of the detected AC signal based on the target level signal, and sends a frequency adjustment instruction to the clock generator module when the current frequency is different from the original frequency; the clock generator module provides a clock signal for the ADC module so as to drive the ADC module to sample according to a sampling frequency, and the sampling frequency is equal to a preset multiple of a current frequency; the ADC module performs voltage sampling and current sampling on the detected alternating current signal according to the sampling frequency to obtain a first digital signal and a second digital signal, and transmits the first digital signal and the second digital signal to the main control module; the main control module calculates a group of electrical parameters of the detected AC signal. By implementing the technical scheme provided by the invention, the measurement accuracy can be effectively improved.

The invention provides a measurement method and device, and the method comprises the steps: receiving first configuration information, the first configuration information comprises first information and second information, the first information is used for indicating the length of each first measurement gap in at least two first measurement gaps, and the at least two first measurement gaps are located in a first measurement period; two adjacent first measurement gaps in the at least two first measurement gaps have an interval in the time domain, and the second information is used for indicating the starting time of each first measurement gap in the at least two first measurement gaps; and performing pilot frequency measurement on the at least two first measurement gaps. According to the measurement method and device provided by the embodiment of the invention, the conflict between the measurement time and the service data transmission time can be reduced.

The invention belongs to the technical field of optical frequency comb repetition frequency, and discloses an optical frequency comb repetition frequency control system and a locking method, and the system comprises a light source module, a signal detection module, a frequency measurement module, a comparison frequency generation module and a feedback control module. The light source module generates an optical frequency comb; the signal detection module converts the optical signal into an electric signal, noise reduction and amplification processing are carried out through a signal processor, and noise reduction adopts a wavelet transform method; the frequency measurement module adopts a dual measurement mode of a frequency counter and a spectrum analyzer to accurately measure repetition frequency; the comparison frequency generation module provides high-precision reference frequency; and the feedback control module performs closed-loop adjustment according to the difference value between the measurement frequency and the reference frequency. By optimizing signal processing and adopting dual-frequency measurement and closed-loop feedback control, the problems of weak electric signals, large noise interference and low frequency control precision in the prior art are effectively solved, and the stability and accuracy of the repetition frequency of the optical frequency comb are improved.

The invention discloses a mobile metering work square cabin, the interior of the square cabin is divided into a front cabin area and a rear cabin area by using two partition plates, the front cabin area is a metering work area, and the rear cabin area is a metering device storage area; the comprehensive verification equipment 1 is fixed in the middle of the front part of the metering working area and is used for metering the special detection equipment; the left side and the right side of the front part are respectively provided with a workbench 2 for electromagnetic metering; a workbench 2 is arranged on the right wall and is used for metering radio and time frequency; the left wall is provided with a workbench 2, the right side of the workbench 2 is provided with a constant-temperature and constant-humidity test box 3 used for mechanical and thermal metering, the lower part of each workbench is provided with a drawer 4 capable of bearing a metering instrument, and the upper part of each workbench is provided with a power socket, a network interface and an illuminating lamp switch; the left wall and the right wall of the metering device storage area are each provided with a metering instrument storage and transportation frame 5 used for containing a metering instrument box 6, and the right side of the access door 7 is provided with a power distribution cabinet 8.

Some embodiments include a first oscillator circuit including a first input node to receive a connection from a first resonator, and a first output node to provide a first oscillating signal; a second oscillator circuit including a second input node to receive a connection from a second resonator, and a second output node to provide a second oscillating signal; a frequency measurement circuit coupled to the first output node and the second output node; a code generator including an input node coupled to an output node of the frequency measurement circuit, and an output node to provide a code; and a timing signal generator including a node coupled to the output node of the code generator, an input node coupled to the output node of the first oscillator circuit, an output node to provide an output oscillating signal.

The invention discloses a rapid high-precision frequency measurement method for super-synchronous inter-harmonics, and relates to the field of signal processing, and the method comprises the steps: S1, presetting a reference fundamental wave signal, and generating a modulation fundamental wave signal on a discrete time sequence through a super-synchronous source; s2, setting the reference fundamental wave signal and the modulation fundamental wave signal in a discrete time sequence, and intercepting an abnormal frequency interval; s3, extracting all abnormal fundamental wave data and all reference fundamental wave data; s4, abnormal components, higher than the corresponding reference fundamental wave data, of the abnormal fundamental wave data are screened out, and accurate frequency harmonic correction is carried out. The blind source separation algorithm is adopted to accurately extract the abnormal frequency interval, and the abnormal fundamental wave data and the reference fundamental wave data are compared, so that the frequency correction can be carried out in time, the data processing and analysis can be carried out in real time, the processing delay is reduced, and the reliability of the frequency measurement is improved.

The invention discloses a hydrophone low-frequency sensitivity calibration method based on time domain scaling average processing, relates to the technical field of hydrophone low-frequency sensitivity calibration, and solves the problem of inaccurate direct sound wave amplitude measurement caused by boundary sound reflection superposition of an experimental pool and a measuring device in hydrophone calibration. Comprising the following steps: placing a light-reflecting and sound-transmitting thin film in a water body, and carrying out transducer and thin film laying and laser focusing; the underwater sound pressure value is reproduced based on a laser interference method; when reflection sound and direct sound superposition occurs in low-frequency measurement data, adjacent frequency points are selected to carry out multiple times of measurement. The arrival time of the direct sound is accurately measured by transmitting the high-frequency sound pulse, so that alignment of starting points of waveform data with different frequencies is realized; when low-frequency measurement is carried out, not only data of the inspected frequency is collected, but a narrow frequency band near the inspected frequency is selected, and multi-frequency-point data is sequentially collected and subjected to subsequent algorithm processing.

The invention provides an inter-satellite link bidirectional measurement method based on a same-time same-frequency full-duplex system, which overcomes the problem that receiving and transmitting of a traditional time-division half-duplex system cannot work at the same time and at the same frequency, and can effectively improve the information transmission rate and the ranging precision. The inter-satellite transmission rate, the measurement frequency and the data updating rate can be doubled; simultaneous and same-frequency measurement between satellites can greatly eliminate distance measurement errors caused by relative motion between satellites, clock skew and Doppler effect; a complex orbit model does not need to be established to improve the distance measurement precision, the time scale reduction error is greatly reduced, and the overall measurement performance is improved.

The invention provides a small-angle measuring reference device based on interference frequency selection and microprism array feedback, which comprises a laser generating device and a beat frequency measuring module, and is characterized in that a narrow-band interference sheet (4), a microprism array (5) and a piezoelectric module (6) are fixed on a high-precision horizontal rotating table (7) in parallel; the rear surface of the microprism array (5) is bonded with the front surface of the piezoelectric module (6), and the center of the rear surface of the piezoelectric module (6) is located at the axis position of the rotating table. And when the frequency of the measured laser is changed by delta f, the variable quantity of the beat frequency is equal to delta f. By means of ultrahigh sensitivity of laser frequency to cavity length, the cavity length is changed by rotating the cavity mirror to cause frequency change, then angle measurement is converted into frequency measurement, mode selection is carried out through auxiliary adjustment of the narrow-band interference sheet, cavity mode change and interference frequency selection are highly synchronous, and mode hopping of laser output frequency is avoided. The continuous tunability of the output frequency along with the rotation angle is ensured, and small-angle ultrahigh-precision measurement is realized.

The invention discloses a frequency sweep measurement method and system. The method comprises the following steps: acquiring a fundamental frequency reference phase of each measured equipment access point at a measurement moment; executing rough scanning of the first-stage injection; analyzing the coarse scanning response data to identify a target frequency band which needs to be subjected to second preset resolution measurement; executing fine scanning of second-stage injection for the target frequency band; and analyzing the fine scanning response data, and obtaining a stability contribution evaluation result of each tested device to the power grid system based on an analysis result of the fine scanning response data and an analysis result of the coarse scanning response data. According to the scheme of the invention, the method can achieve the quick recognition of the potential key frequency region in a broadband range through the hierarchical rough scanning and fine scanning strategies, and avoids the time-consuming high-resolution measurement in a whole frequency band. And then, high-resolution fine scanning is performed on the identified target frequency bands in a targeted manner, so that accurate and detailed response data can be obtained in the key region.

The invention relates to the technical field of electricity meter metering, and discloses an electricity meter phase calculation method and device, and the method comprises the steps: carrying out the marking sampling of a voltage signal of an electricity meter based on a preset first frequency, and obtaining at least two sampling points; performing forward zero crossing point judgment on all the sampling points, and taking the sampling points meeting the judgment condition as target points; obtaining a frequency measurement value based on a preset first frequency and the number of sampling points between two adjacent target points, and calculating an average frequency value; and reading all the index values in the target register, and calculating the phase of the ammeter according to all the index values and the average frequency value. According to the invention, the adjacent sampling points are subjected to forward zero crossing point judgment, and the target points are selected according to the judgment result, so that the average frequency value is calculated according to the number of the target points and the sampling points, and the ammeter phase is calculated according to the read index value in the target register and the average frequency value. And high-efficiency and high-precision ammeter phase calculation is realized.

The invention relates to the field of power grid monitoring, in particular to a frequency measurement method and terminal for power grid monitoring, and the method comprises the steps: enabling a current sequence, a voltage sequence, a frequency sequence and a temperature sequence collected by the power grid frequency measurement terminal to pass through a temperature prediction model of a physical constraint neural network architecture, so as to generate a temperature prediction value; constructing a differential algebraic constraint term based on a current sequence change rate, a frequency sequence acceleration, a temperature sequence change rate and a temperature prediction value and an energy conservation term based on electromagnetic energy calculation for optimizing and training a temperature prediction model; and calculating a frequency temperature drift value based on the temperature prediction value, and correcting a frequency acquisition value of the power grid according to the frequency temperature drift value. The frequency measurement error caused by the temperature drift effect of the power grid in the high-temperature environment can be counteracted in real time, and the temperature drift suppression capability of power grid monitoring frequency measurement is improved.

The invention discloses a self-adaptive large dynamic detection noise floor suppression system and a control method thereof. The system comprises a filtering selection front-end module, a detection synthesis module, a frequency measurement receiving module and an FPGA feedback control module. The method is composed of four main parts, namely a filtering selection front end, detection synthesis, frequency measurement receiving and FPGA feedback control. Wherein the filtering selection front end and the frequency measurement receiving end receive two groups of external radio frequency signals at the same time. And frequency measurement is carried out through a mature single-bit receiving scheme in frequency measurement receiving, and a result is sent to the feedback control module, so that switching of a filtering channel and suppression of a noise floor are realized. According to the invention, the broadband large dynamic DLVA detection sensitivity is obviously improved.

The invention discloses a system reference clock frequency accuracy automatic calibration circuit and a calibration method thereof, and belongs to the technical field of frequency sources, the calibration circuit comprises a first crystal oscillator, a first power divider, a second power divider, a second crystal oscillator, an analog switch, a radio frequency switch, a detector, a comparator, an FPGA controller, a digital analog converter, an operational amplifier and a temperature sensor. When an external high-precision reference clock is accessed, the FPGA controller automatically switches a frequency measurement reference, performs high-precision frequency measurement on a 100MHz signal output by the first crystal oscillator, and judges whether calibration is needed or not according to frequency offset; if calibration is needed, the output voltage of the digital-to-analog converter is adjusted, the Vc end of the first crystal oscillator is controlled after operational amplification, and frequency closed-loop adjustment is achieved. According to the method, the crystal oscillator does not need to be disassembled, calibration is rapidly completed on site, and system availability and long-term frequency stability are remarkably improved.

The invention provides a frequency measurement device based on an optical frequency comb and cyclic frequency shift. The frequency measurement device comprises a laser, an optical beam splitter, an electro-optic intensity modulator, an optical cyclic frequency shift loop, an optical frequency comb generation unit, an optical beam combiner, a multichannel optical filter, a multichannel photoelectric detector, a multichannel low-pass filter and a multichannel acquisition processing unit. According to the device, broadband high-precision frequency measurement is realized by adopting a method of combining cyclic frequency shift with Fourier transform, an optical frequency comb is adopted as a local oscillation light source, sub-band division of a radio frequency spectrum is realized by combining a multi-channel optical filter, parallel frequency measurement of each sub-band can be realized, the cycle index of a frequency shift loop is reduced, the cycle time of the loop is shortened, and the measurement efficiency is improved. Noise accumulation caused by multiple cycles is reduced, and the signal-to-noise ratio and the dynamic range of radio frequency signal frequency measurement detection are improved, so that the frequency measurement requirements of broadband high precision, high signal-to-noise ratio, high dynamic and quick response are met.

The present disclosure provides a measurement configuration method and apparatus, a device, and a storage medium, and relates to the field of communication technology. The method includes: determining, in response to that an inter-frequency measurement is to be performed on a to-be-measured inter-frequency reference signal, whether the to-be-measured inter-frequency reference signal is to be measured based on a measurement gap.

User Equipment (UE) band capabilities are received from a UE. A set of frequency band combinations are determined for the UE based on the UE band capabilities. Each frequency band combination of the set of frequency band combinations includes a group of frequency bands, and a frequency band combination priority value. Further, one or more frequency band combinations are identified from the set of frequency band combinations based on a current frequency band of the UE and the frequency band combination priority value. The UE is configured to perform frequency measurements for a plurality of frequency bands based on the one or more identified frequency band combinations. The UE is dynamically facilitated to latch to at least one frequency band based on the frequency measurements of the plurality of frequency bands.

The invention discloses a high-precision dynamic measurement method and system for power grid frequency, and the method comprises the steps: carrying out the point-by-point filtering of an input signal, removing the noise and interference in the signal, carrying out the point-by-point analysis of the signal, and calculating the frequency value of the signal; judging the validity of the frequency value, finally judging whether the frequency is stable or not, and updating the frequency. Through cooperative work of multiple steps of signal preprocessing, frequency calculation, frequency effective value judgment and frequency updating, the problems that in the prior art, frequency measurement precision is insufficient, and adaptability to noise and frequency dynamic changes is poor are effectively solved. The method has remarkable advantages in the aspects of improving measurement precision, adapting to dynamic frequency change, suppressing noise interference, meeting real-time requirements and the like, and has wide application prospects in numerous equipment such as electric power equipment, distribution network equipment, protection equipment and the like.

The invention relates to the technical field of electronic measurement and sensing, and discloses a capacitance monitoring method and system based on a sweep frequency resonance point, and the method comprises the steps: carrying out the coarse sweeping in an initial frequency range, obtaining an impedance spectrum, and recognizing a coarse resonance interval; carrying out fine scanning in the interval and calculating an accurate resonant frequency by adopting a quadratic interpolation method; calculating a capacitance value in combination with the mapping table; and dynamically adjusting the frequency sweeping window of the next period based on the historical resonant frequency. The system comprises an excitation signal generation unit, an impedance response acquisition unit, a coarse / fine scanning control unit, a resonant frequency calculation unit, a capacitance resolving unit and a dynamic frequency window updating unit, and integrates a temperature compensation and anomaly detection mechanism. Through the two-stage frequency sweeping and self-adaptive frequency window strategy, the monitoring period is shortened to 1 / 5 or below of that of a traditional method while it is guaranteed that the resonant frequency measurement precision is superior to 0.01 Hz, and the real-time performance, stability and environmental adaptability are remarkably improved.

The invention provides a regional power grid equivalent damping coefficient evaluation method and system based on data collected by a synchronous phasor measurement device, and belongs to the technical field of power system parameter identification. The method comprises the following steps: firstly, selecting a frequency measurement result with relatively high data quality before and after a large disturbance event, and analyzing the influence of a determined component and a noise component of an active unbalance amount on a system frequency dynamic state in the large disturbance event; secondly, performing curve fitting on discrete frequency measurement results, and estimating a frequency response component caused by a noise component effect after a large disturbance event based on a superposition principle; on the basis, the equivalent damping coefficient of the regional power grid is estimated by combining the active power sudden change amplitude caused by the large disturbance event, the occurrence time of the large disturbance event and the inertia coefficient of the regional power grid.

The invention discloses a power transmission tower grounding resistance value measuring system and method based on multi-frequency measurement, and relates to the technical field of lightning protection and grounding of a power system, and the system is composed of a power module, an MCU main control unit, a sinusoidal voltage generation circuit module, a current detection circuit module and a phase detection circuit module. The power supply module supplies power to the whole system; the sine voltage generation circuit module is composed of a DDS signal generation module, a drive circuit and a voltage transformer. The current detection circuit module is composed of a current transformer, a high-precision resistor and a filtering module. The phase detection circuit module detects the phase difference between the voltage and the current; according to the power transmission tower grounding resistance value measuring method based on multi-frequency measurement, multiple measurement data can be obtained through multi-frequency measurement, calculation is carried out in a weighted average mode according to the influence of power transmission line discharge on each frequency, so that the final grounding resistance value is obtained, the data are more accurate, and the measurement result is more significant.

The invention relates to the technical field of low-power-consumption electronics, and discloses a low-power-consumption instantaneous frequency measurement system which comprises a radio-frequency signal acquisition module, a signal time-frequency conversion module, a noise floor coding module and the like. The system generates a feature tensor through time-frequency analysis of a radio frequency signal, realizes dynamic threshold fusion in combination with noise floor sparse coding, extracts a multi-scale transient frequency feature by using a pyramid convolutional neural network, dynamically suppresses noise based on a signal-to-noise ratio weight, and reconstructs a real-time spectrum distribution image. The power consumption control module can adjust the ADC sampling rate and the clock frequency of the processing unit according to the signal strength, and the power management unit adopts multi-voltage domain independent power supply. The system solves the problems of frequency measurement precision and power consumption under complex noise, is suitable for the fields of wireless communication and the like, and has the characteristics of high precision, low power consumption, high spectral resolution, visualization and intuition.

The invention relates to the technical field of signal analysis, and discloses a signal frequency measurement method, device and equipment and a storage medium, and the method comprises the steps: obtaining a to-be-measured signal; the to-be-detected signal is obtained by performing at least one period of signal acquisition on a target continuous wave signal; extracting an amplitude value, a direct current component, an initial phase point and a signal type of the to-be-measured signal; according to the amplitude value and the direct current component of the to-be-measured signal, taking an initial phase point as a starting point of a fitting signal, and generating the fitting signal of the signal type; adjusting the frequency of the fitting signal until the waveform of the signal to be measured coincides with the waveform of the fitting signal; and obtaining the frequency of the target continuous wave signal according to the adjusted frequency of the fitting signal. And high-precision and rapid frequency measurement of continuous wave signals can be realized.