233 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 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 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 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 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 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.

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.

This invention proposes a rapid and non-destructive method for identifying the resonant frequency of heavy-duty mechanisms. The load-end speed curves and motor-end speed curves under closed-loop and open-loop conditions at the motor end are obtained using the speed step response method and the current step response method, respectively. By performing an FFT transform on the two speed curves, the resonance peak is obtained, allowing for rapid measurement of the structural resonant frequency and the combined resonant frequency. This method eliminates the need to purchase an additional resonance analyzer, reducing measurement costs, and avoids the damage to large, heavy-duty servo mechanisms caused by sinusoidal frequency sweep measurements. It can not only be used for rapid identification of structural resonant frequencies but also to guide the design of servo controllers.

The invention discloses a frequency measurement method, system and device and a computer readable storage medium, and belongs to the technical field of electricians. Acquiring a sampling value, and judging whether the sampling value is invalid or not based on the absolute value of the sampling value; determining a first frequency value based on the sampling value and the sampling frequency; determining an amplitude and a phase of a vector value of the signal based on the sampling value; determining a second frequency value according to the phase change; determining a frequency based on the first frequency value and the second frequency value; according to the frequency measurement method, system and device and the computer readable storage medium, a low-value locking technology, an extreme value anti-shake technology, a sampling zero crossing point anti-shake technology and a hysteresis frequency calculation technology are adopted, and sampling point frequency measurement and vector frequency measurement are organically combined, so that the frequency measurement precision when the signal frequency fluctuates in a large range under different working conditions is ensured; and the problem that the frequency measurement error is large when the signal frequency fluctuates in a large range is solved.

The invention relates to a method for rapidly measuring the resonant frequency of a resonant cavity based on frequency spectrum polynomial fitting, and belongs to the technical field of acoustic / optical measurement. The objective of the invention is to solve the problems of tedious steps, low efficiency, long time, poor stability and the like of a resonant cavity or resonant photoacoustic cavity resonant frequency measurement method. According to the method, the frequency spectrum of the resonant cavity is obtained through frequency mixing excitation, the frequency is obtained after curve fitting is conducted on frequency spectrum data points through a frequency spectrum polynomial fitting algorithm, and then resonant frequency measurement of the resonant cavity is achieved. According to the method, the measurement time of the resonant frequency of the resonant cavity is remarkably shortened, the measurement steps are simplified, and the measurement precision is improved; meanwhile, the resonance frequency is solved through frequency spectrum polynomial fitting, data noise interference can be effectively reduced, and the method has higher robustness. All frequency signals within the resonant frequency drift range are transmitted at a time through frequency mixing excitation, one-by-one scanning is not needed, and therefore the method has the advantages of being good in real-time performance, high in response speed, high in precision and the like, and is suitable for rapid frequency calibration and real-time monitoring in the fields of acoustic resonators, resonant photoacoustic spectra and the like. And a novel method for measuring the resonant frequency is provided for the fields of high-sensitivity resonance photoacoustic spectroscopy, acoustic trace gas detection and the like.

The invention discloses a method and a device for measuring sound field distribution of an ultrasonic cleaning tank, which can be used for real-time measurement of any space point sound pressure and point frequency of a liquid medium in ultrasonic cleaning equipment and can also be used for acquiring sound field distribution after interference superposition of sound pressure and frequency of any longitudinal and cross sections of the cleaning tank. Measurement signals of the sensor are subjected to impedance and amplitude adjustment, shaping, frequency band bridging and dynamic gain adjustment, spatial interpolation and windowing are carried out on measurement data, and a sound pressure and frequency measurement algorithm is combined, so that the parameter distribution rule of the sound field in the cleaning tank can be accurately obtained. According to the invention, an on-line detection means can be provided for the ultrasonic cleaning equipment so as to ensure the operation condition of the field cleaning equipment, and reference and basis can be provided for optimizing the structure of the cleaning equipment and the layout of the transducer.

A method for determining a state parameter of a global navigation satellite system receiver and an apparatus, in particular its absolute position, determining being based on—a measured information including a pseudorange, a carrier phase and / or a Doppler frequency measurement, —broadcast information on the satellite orbits and clock offsets, and—high accuracy correction information of a satellite positions, clock offsets, code and / or phase biases, the method comprising: —determining a satellite position estimate and a clock offset estimate based on the broadcast information, —determining a corrected satellite position and a corrected clock offset based on the satellite position estimate and the clock offset estimate by using the high accuracy information, in particular the high accuracy correction information of the satellite position and the clock offset.

The present disclosure relates to the technical field of power system frequency measurement, and discloses a method, device, and electronic device for measuring ultra-high voltage high harmonic frequency, comprising: dynamically selecting the optimal window function type, window length, and sliding step size for the power system operating state based on the time-varying frequency signal characteristics of the power system using an adaptive window information design algorithm based on reinforcement learning; performing a short-time Fourier transform on the time-varying frequency signal based on the selected window function type, window length, and sliding step size, retaining the positive frequency components and deleting the negative frequency components during the short-time Fourier transform process, and converting the time-varying frequency signal from a time domain representation to a two-dimensional time-frequency matrix represented in the time-frequency domain; determining the spectral line position based on the two-dimensional time-frequency matrix, and determining the ultra-high voltage high harmonic frequency based on the main spectral line position, the sampling rate for the time-varying frequency signal, and the selected window length. The above method can improve the accuracy of the measurement results of the ultra-high voltage high harmonic frequency.

The invention discloses a high-precision frequency measurement system based on a Beidou satellite. The high-precision frequency measurement system comprises a basic signal generation module, a Beidou signal receiving module, a signal processing module, a clock module, a counter module, a display module and an interface module, the interface module is electrically connected with external equipment, the basic signal generation module generates a reference frequency signal, and the Beidou signal receiving module receives a real-time Beidou satellite signal; the signal processing module carries out correction processing on Beidou satellite signals, and the display module displays measurement results. Compared with the prior art, the high-precision frequency measurement system and measurement method based on the Beidou satellite have the advantages of being convenient to operate and use and high in measurement precision.

The invention discloses a broadband harmonic voltage measuring system and method based on an improved CVT, and the system comprises a first current sensor which is used for measuring the first current of a high-voltage capacitor of the CVT; the broadband harmonic wave acquisition device is used for sampling the first current to obtain first current sampling data; and the broadband harmonic analysis device is used for determining an amplitude frequency spectrum of the first current based on the first current sampling data and determining each frequency component of the system voltage based on the amplitude frequency spectrum of the first current. On the basis of a large number of CVTs used in a power system, the broadband harmonic voltage measurement function within the range of hundreds of kHz is achieved by improving the CVT, the original power frequency measurement function of the CVT is not changed, the operation reliability of the CVT is not reduced, and effective broadband, high-precision and low-cost harmonic voltage measurement can be achieved.

The invention discloses a power grid harmonic wave and inter-harmonic wave detection method and device based on distributed multi-frequency measurement data, equipment and a medium. A sine wave method comprises the following steps: detecting harmonic wave and inter-harmonic wave components existing at each sine wave measurement point based on a random matrix theory; determining the frequency and amplitude of each harmonic wave and inter-harmonic wave of each sine wave measurement point by using a rotation invariant technology; clustering the frequency of each harmonic wave and inter-harmonic wave on each measurement point by using a density-based noise application space clustering method to obtain the target frequency of each frequency cluster; and determining harmonics and inter-harmonics of the power grid according to the target frequency and the amplitude. Each harmonic and inter-harmonic component existing on a measurement point is detected through a random matrix theory and a rotation invariant technology, accurate frequencies and amplitudes of the harmonic and the inter-harmonic are obtained, and more accurate frequencies of the harmonic and the inter-harmonic of a power grid are obtained by fusing data of a plurality of distributed measurement points through a clustering method. Therefore, the detection capability of harmonic waves and inter-harmonic waves of a power grid is improved.

The techniques described herein provide enhanced measurement gap sharing solutions that enable measurement gap sharing for layer 1 (L1) measurements for serving and non-serving cells, and for layer 3 (L3) measurements for intra-frequency measurements and inter-frequency / inter-radio access technology (RAT) measurements. Also provided are solutions for measurement gap sharing among intra-frequency L1 and L3 measurements and inter-frequency L1 and L3 measurements. Measurement gap patterns for L1 and L3 measurements are also provided, as well as solutions for further splitting L1 measurement gap sharing among different types of L1 operations.

The invention provides an intermediate frequency signal processing unit for generating a radio frequency characteristic simulation decoy signal, which belongs to the field of radar signal processing, and comprises a signal receiving and parameter measuring module for completing orthogonal frequency mixing, detection, DDC and extraction on a target radar signal, pulse time domain parameter measurement, frequency measurement and intra-pulse parameter measurement are carried out on the signals to obtain detection signals, PDW information and frequency information; the matching tracking module is used for filtering irrelevant pulses in a signal environment according to the detection signals, the PDW information and tracking parameters, and performing frequency matching and PRI tracking on the received detection signals; the time sequence control module is used for generating time sequence control parameters and time sequence control signals according to the working parameters, the detection signals and the tracking gate; the signal storing and playing module is used for storing and playing the target radar signal according to the time sequence control signal; and the decoy interference generation module is used for generating a decoy interference signal according to the target radar signal, the frequency information and the time sequence control parameter.

This invention relates to a system for realizing bidirectional RF signal source output of a millimeter-wave vector network analyzer. The system includes a vector network analyzer main unit, a main unit port output channel, a rear panel output channel, and a signal switching and control unit. The vector network analyzer main unit has a built-in main RF signal source, and the RF signal output from the main RF signal source is output from the front test port of the vector network analyzer main unit. The rear panel output channel outputs the RF signal output from the main RF signal source from the rear auxiliary RF port of the vector network analyzer main unit. The system, method, apparatus, processor, and computer-readable storage medium of this invention for realizing bidirectional RF signal source output of a millimeter-wave vector network analyzer improve high-frequency measurement performance. By using the spread spectrum module as a remote test head closer to the DUT, it reduces the loss and error of long cables, increases testing flexibility, and enables switchable RF signal source output paths, meeting the needs of various testing scenarios.

The invention provides a method for improving PT residual voltage frequency measurement accuracy based on rotation vector characteristics, and relates to the technical field of generator set rotation speed measurement. The method comprises the following steps: acquiring a three-phase voltage alternating current signal through a generator end PT; processing the three-phase voltage signal to obtain projections of a voltage rotation vector on alpha and beta static coordinate axes; frequency characteristics are extracted based on projection and voltage amplitude and can be realized through direct calculation or a phase locking link; performing low-pass filtering on the frequency characteristic direct current quantity; a generator speed is calculated based on the filtered frequency and provided to a governor. According to the method, the limitation that a traditional PT residual voltage method only depends on zero crossing point information is broken through, frequency characteristics are extracted through a complete voltage sequence, alternating current signal filtering distortion is avoided through direct current filtering, high measurement precision and high anti-interference capacity can still be kept under the low-speed working condition, the problems that an existing speed measurement method is insufficient in precision and weak in anti-interference capacity are effectively solved, and the method is suitable for popularization and application. And reliable guarantee is provided for safe and stable operation of a unit.

The invention discloses a cable buffer layer ablation judgment method, system and device and a storage medium, and the method comprises the steps: employing sine wave voltages of different frequencies to test a cable, and synchronously measuring a voltage complex effective value and a current complex effective value under different frequencies; a cable equivalent circuit model containing buffer layer resistance and grounding impedance is established according to a cable mechanism, so that a plurality of Ohm law simultaneous equation sets are constructed, a buffer layer resistance value is solved simultaneously, whether the buffer layer is ablated or not is judged based on the value, and the method can also be used for evaluating the repair condition of the cable buffer layer. According to the method, each resistance component is decoupled through double-frequency testing, grounding parameter interference is eliminated, compared with a traditional single-frequency measurement method, the buffer layer resistance measurement precision is remarkably improved, and a reliable basis is provided for cable state evaluation and repair effect evaluation.

A first apparatus 110 receives, from a second apparatus 120, a best effort radio resource management (RRM) measurement configuration 510 indicating that a prioritization of inter-frequency measurement

The present invention discloses a vibration measurement method based on acceleration sensor compensation, comprising: collecting vibration acceleration at various frequency points preset within a frequency measurement range by a vibration measuring product equipped with a MEMS acceleration sensor, comparing the collected vibration accelerations with preset vibration acceleration values, determining an attenuation coefficient at each frequency point, and establishing a compensation model for the vibration measuring product; collecting the measured vibration signal at an adaptive sampling rate by the vibration measuring product to obtain an acceleration sequence thereof, compensating the acceleration sequence according to the compensation model; calculating an acceleration peak value; performing time domain integration processing and detrending processing on the acceleration sequence to obtain a velocity sequence, and calculating an effective velocity value; performing time domain integration processing and detrending processing on the velocity sequence to obtain a displacement sequence, and calculating a peak-to-peak displacement value. The present invention improves detection accuracy by compensating the acceleration collected by the MEMS inertial sensor.

The application provides a quantum sensor based on Rydberg atoms, which comprises a probe light assembly, a coupling light assembly, an atomic gas chamber, a photodetector, a to-be-measured signal assembly, a local oscillator signal assembly and a metasurface structure, and the probe light and the coupling light are reverse collinear; the metasurface structure is arranged on the side wall of the atomic gas chamber, and the to-be-measured electromagnetic wave signal and the local oscillator electromagnetic wave signal are transmitted to the atomic gas chamber through the metasurface structure; the photodetector converts the probe light into an electric signal, and the frequency spectrum data of the electric signal is acquired through a frequency spectrometer. The application realizes the frequency measurement function of the to-be-measured electromagnetic wave signal, and through the high transmission effect of the metasurface structure, the standing wave effect of the electromagnetic wave signal in the atomic gas chamber is weakened, and the electromagnetic wave radiated into the atomic gas chamber has higher transmission efficiency and utilization.

The invention provides a frequency measurement method, device and equipment. The method comprises the following steps: determining the phase variation of a target baseband signal in a time window; the target baseband signal is converted from a radio frequency signal to be measured; determining the frequency of the target baseband signal according to the phase variation; and determining the frequency of a radio frequency signal corresponding to the baseband signal according to the frequency of the target baseband signal. According to the method provided by the embodiment of the invention, the frequency of the measured radio frequency signal can be efficiently and accurately calculated, the precision and resolution of frequency measurement are effectively improved, and the efficiency of frequency measurement is greatly improved.

The invention discloses a double-frequency laser heterodyne interference displacement measurement system and method based on electro-optical modulation, and mainly solves the problems that optical aliasing causes nonlinear errors and speed measurement is limited by frequency difference in the existing method. Comprising the following steps: 1) a laser generates fixed wavelength laser with stable frequency; 2) controlling the radio frequency modulation frequency through a signal generator so as to adjust the frequency difference; 3) MZM carrier suppression double-sideband modulation generates a double-sideband optical signal as double-frequency measurement light; 4) establishing a measurement light path, and converting the displacement of the target to be measured into Doppler frequency shift; according to the method, non-linear errors caused by double-optical-frequency orthogonal polarization aliasing are effectively avoided, the measurement accuracy is remarkably improved, and the requirements of different measurement scenes such as linear motion and vibration can be met.

The application provides a frequency standard measurement method, device, computer equipment and storage medium, the method comprises: frequency source output measurement signal is carried out frequency division processing, obtains low frequency pulse signal; using high-precision time interval counter to low frequency pulse signal is carried out delay measurement and time interval counting, and is output in the form of time stamp; by setting a sliding window, using sliding average algorithm to time stamp is carried out sliding average filtering processing, all time stamps are carried out sliding difference to obtain time difference, time difference is grouped according to order and is taken average in group to obtain average time difference; by increasing the length of the sliding window, the number of samples is increased to reduce the statistical error; using average time difference, calculate frequency measurement value, relative frequency deviation and allan variance. The method of the application increases the sliding window, and the frequency measurement result obtained by the algorithm of grouping and averaging the time difference has higher measurement precision and stability.