26 results about "Frequency measurements" patented technology

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 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.

This invention discloses a high-precision zero-crossing processing system and method for frequency and phase calculation, comprising: a voltage input front-end circuit module, a current input front-end circuit module, an analog-to-digital conversion module, a hardware zero-crossing judgment circuit module, and a main control microcontroller module. In this scheme, the filters and protection components in the voltage input front-end circuit module and the current input circuit effectively filter out high-frequency noise, ensuring the purity of the voltage and current signals. The analog-to-digital conversion module further filters out noise interference through a rate-of-change check mechanism, ensuring that the detected zero-crossing point is the true zero-crossing point of the voltage signal. Linear interpolation is used to more accurately determine the time position of the zero-crossing point, reducing interpolation errors and significantly improving the accuracy of frequency measurement. The main control microcontroller module accumulates sufficient samples and combines them with a weak low-pass filter to smooth the changes during the cycle, further stabilizing the frequency measurement results.

The application provides a high-speed frequency hopping signal capturing device and method, which comprises a radio frequency channel processing unit, a wideband frequency division unit and a first switch switching unit connected in sequence, the first switch switching unit is connected with a frequency counting frequency measurement unit and a wideband demodulation frequency measurement unit, the frequency counting frequency measurement circuit unit and the wideband demodulation frequency measurement circuit unit are connected to a second switch switching unit, the second switch switching unit is connected with a wideband high-speed frequency hopping signal capturing processing unit; the radio frequency channel processing unit is used for measuring the power of the measured radio frequency signal and filtering the stray outside the bandwidth; the wideband frequency division unit is used for frequency dividing the measured radio frequency signal to obtain a wideband intermediate frequency signal; the application adds the wideband demodulation frequency measurement circuit unit, improves the time resolution to several ns, and only needs a low-cost sampling rate ADC and an easily programmable logic device to realize, so that the design difficulty and complexity of the circuit and timing are greatly simplified.

This application discloses a high-precision microwave frequency measurement method and system based on continuous-time crystal phase transitions, belonging to the field of quantum sensing technology. This method utilizes the characteristic of the Rydberg atom system at the critical point of a continuous-time crystal phase transition where the response slope of the detected light transmission signal to the microwave frequency is significantly enhanced, breaking through the resolution limit of traditional linear responses. The system includes a quantum sensing unit, an optical excitation and detection module, a microwave modulation and scanning module, an auxiliary radio frequency field module, and a signal processing and control center. By precisely adjusting the parameters, the system is driven to the vicinity of the critical point, the critical frequency is identified, and its high response slope is used to achieve precise frequency measurement. This invention employs a two-stage measurement process, balancing wide dynamic range and high precision, and can be flexibly tuned to adapt to different frequency bands, possessing broad application prospects, especially in microwave communication, frequency metrology, and other fields with significant technical value.

This invention belongs to the technical field of low-frequency calibration methods for non-free-field hydrophones, and particularly relates to a low-frequency calibration method for non-free-field hydrophones based on multi-frequency measurement and deep learning. The method involves determining the test frequency points for hydrophone calibration, selecting several frequency points within the nearest frequency band of each test frequency point, emitting sinusoidal pulse signals through an underwater acoustic transducer, and receiving the acoustic signal waveforms corresponding to each frequency point at the sound pressure measurement point. The received waveforms at each frequency point are then time-domain aligned and resampled to construct a two-dimensional waveform diagram with time as the horizontal axis and frequency as the vertical axis. In this two-dimensional waveform diagram, the direct sound components are vertically distributed, while the reflected sound components are slopingly distributed with different slopes. A deep learning module based on a U-shaped encoder-decoder network structure is constructed, and this deep learning module is trained and its parameters optimized using a pre-generated two-dimensional waveform dataset.

This invention discloses a method, system, equipment, and medium for panoramic identification of short-circuit parameters in distribution networks based on multi-frequency disturbance excitation. It belongs to the field of power system condition monitoring and fault analysis technology. The method includes: designing and generating a composite disturbance signal; injecting the composite disturbance signal into the bus under test of the distribution network through a controllable current source, and acquiring time-domain waveform data of the injected current signal and the bus voltage; performing frequency domain transformation to separate and extract voltage and current phasors in the frequency domain; obtaining short-circuit impedance measurements at each frequency point using a first algorithm; and identifying equivalent circuit parameters using the short-circuit impedance measurements at several characteristic frequency points through a parameter fitting method. Compared to traditional single-frequency measurements that can only acquire single-point data, this method provides more comprehensive panoramic parameter information, accurately reflecting the impedance characteristics of the distribution network at different frequencies, and is suitable for modern distribution networks containing a large number of nonlinear loads and power electronic equipment.

To realize a power receiving device that can determine its own resonant frequency without a power transmission device. [Solution] The power receiving device (3) includes a resonant circuit (31), an application unit (52) that applies a search voltage to the resonant circuit from inside the power receiving device and changes the frequency of the search voltage, a measurement unit (53) that measures the change in impedance of the resonant circuit in accordance with the change in frequency of the search voltage without power transmission from the power transmitting device, and a determination unit (54) that determines the resonant frequency of the resonant circuit based on the change in impedance.

The application provides a power system frequency measurement method and system based on the squeeze theorem, which comprises the following steps: sampling the system voltage signal in real time at a fixed sampling frequency fs; determining whether there is a zero-crossing interval according to the positive and negative signs of the sampling value; when the zero-crossing interval exists, calculating the difference value of adjacent points and judging whether the difference value of adjacent points meets a preset similarity condition; when the preset similarity condition is met, determining that the zero-crossing interval is valid based on the squeeze theorem, and calculating the accurate zero-crossing time Tn by linear interpolation; and calculating the system frequency according to the current zero-crossing time Tn and the previous zero-crossing time T0. The sine wave signal of the zero-crossing point is replaced by a linear signal by using the squeeze theorem, so that the influence of the following situations on the frequency calculation can be avoided, and abnormal situations such as burrs, jumps, communication errors, missing points and repeated points caused by electromagnetic interference can be avoided.

The application provides a frequency recovery method and device of a down-converted signal based on modulation characteristics, relates to the technical field of signal carrier frequency recovery, and adopts two different frequency femtosecond pulse light sources to perform multiple optical down-conversion and obtain one two-channel down-converted signal data. After a complex signal is obtained through Hilbert transform, autocorrelation and cross-correlation products are calculated, the autocorrelation and cross-correlation products are shifted in the frequency domain, and a cross-correlation coefficient is calculated to analyze correlation, so as to determine a frequency combination type. Based on the determined frequency combination type, a remainder matching method is used to recover original carrier frequency information. The method eliminates frequency ambiguity when a frequency is measured by using double femtosecond pulse light sources with different frequencies, improves the frequency measurement accuracy when a frequency is measured by using double light sources, effectively reduces the complexity of the system, and is more easily realized in engineering. Compared with a traditional method, the frequency measurement accuracy of the method is 100% for signals with modulation characteristics.

Apparatus and methods are provided for configuring and applying measurement weight factor for inter-frequency measurements. In one novel aspect, the UE applies measurement weight factors for inter-frequency measurements within configured measurement gap occasions. In one embodiment, the UE receives one or more measurement configurations, which configure a plurality of measurement objects (MOs) to be measured in one or more measurement gaps, obtains a measurement weight factor for each MO, wherein a set of measurement weight factors is included in the one or more measurement configurations; and performs inter-frequency measurements within configured measurement gaps applying corresponding measurement weight factor for each MO. In one embodiment, the set of measurement weight factors are configured for each frequency layer or for each MO. In one embodiment, each measurement weight factor for the same MO is determined based on one or more weight conditions.

The present invention achieves a power reception device capable of identifying its own resonance frequency without a power transmission device.　This power reception device (3) comprises: a resonance circuit (31); an application unit (52) that applies a search voltage to the resonance circuit from inside the power reception device and changes the frequency of the search voltage; a measurement unit (53) that measures a change in the impedance of the resonance circuit due to the change in the frequency of the search voltage, without power transmission from a power transmission device; and a determination unit (54) that determines the resonance frequency of the resonance circuit on the basis of the change in the impedance.

A frequency generator and a frequency correction method for a frequency generator, which have the purpose to provide a frequency correction technology that actively responds to continuous frequency fluctuations of a clock signal through a frequency measurement period of at least two unit periods. The frequency generator comprises: an oscillator which generates an oscillator clock signal; and a frequency correction circuit which selectively operates in one of a normal mode and a fast mode, which have different correction periods according to the state of the oscillator clock signal.

The application discloses a method for realizing dynamic simulation of a channel suitable for spread frequency measurement and control signals, which comprises the following steps: firstly, sampling a static radio frequency spread frequency signal, down-converting the signal to zero intermediate frequency and extracting a speed, so as to obtain a zero intermediate frequency spread frequency signal, and to make the carrier center frequency point Doppler and the spread frequency carrier Doppler accurately decoupled and separated; secondly, realizing dynamic simulation of the channel in two stages, the first stage adopts a variable fraction delay filter to realize time delay and dynamic simulation of the zero intermediate frequency spread frequency signal, and the second stage controls NCO to output a Doppler frequency offset signal corresponding to the radio frequency carrier center frequency point, and the outputs of the two stages are quadrature up-converted to obtain a baseband signal carrying a radio frequency dynamic; and finally, the dynamic radio frequency spread frequency signal is outputted through interpolation and up-conversion. The application realizes accurate simulation of the channel time delay and dynamic of the spread frequency signal by means of the channel simulation in stages and the variable fraction delay filter, and has the advantages of being irrelevant to the system of the sampled signal and not affecting the ranging and speed performance of the signal.

The application discloses a broadband oscillation mode parameter correction method, system, device and storage medium, and is applied to the technical field of power system data processing. The method comprises the following steps: collecting mode signal output by each measuring unit in a power system, and extracting frequency measurement data based on the mode signal; determining a target clustering algorithm according to the frequency measurement data, and clustering the frequency measurement data based on the target clustering algorithm to obtain a clustering cluster corresponding to each oscillation mode; calculating a corresponding center frequency in each clustering cluster, and correcting the frequency measurement value and the corresponding original phase in each clustering cluster based on the center frequency, and outputting the finally corrected mode parameter. Through implementation of the application, the technical problem of low mode parameter identification precision caused by inaccurate clustering result of broadband oscillation mode frequency and inconsistent phase in the prior art can be solved.

This invention provides a temperature-compensated crystal oscillator (TCC) temperature compensation testing system and method. The system includes: a host computer; a frequency source; a high and low temperature test chamber, the host computer setting the temperature of the test chamber; and multiple test circuit boards located inside the test chamber. Each test circuit board includes an FPGA frequency measurement circuit, an ARM control circuit, and multiple TCXO test circuits. The FPGA frequency measurement circuit measures the frequency of the TCC on each test circuit board according to control commands sent by the host computer. Each TCXO test circuit acquires the frequency of the corresponding TCC at different temperatures. The ARM control circuit determines the voltage-controlled voltage (VDC) of each TCC based on the difference between the frequency of each TCC and the frequency of the frequency source. The host computer determines the compensation parameters of the TCC based on the VDC and writes the compensation parameters back to the TCC. This invention enables batch temperature compensation testing, improving testing efficiency.

A user equipment configured to identify one or more conditions for a UE to support gapless measuring for inter-frequency radio resource management (RRM) measurements of a synchronization signal block band (SSB), wherein the one or more conditions comprise a frequency separation between the target SSB and an active bandwidth part (BWP) of the UE being within a configurable threshold or a frequency separation threshold comprises the target SSB be within a channel bandwidth (CBW) of the UE; and transmit, to a next generation node B (gNB), a capability message indicating the UE supports gapless measuring for inter-frequency radio resource management (RRM) measurements of the SSB based on the identified conditions

This invention discloses a method for optimizing the length of transformer test leads based on measured frequency response curves, belonging to the field of power equipment condition-based maintenance and high-frequency measurement technology. The method includes: obtaining the physical straight-line distance between the bushing of the transformer under test and the interface of the testing instrument; forming a test loop by connecting the test leads end-to-end through a standard reference load, and obtaining the measured frequency response amplitude curve by frequency sweeping; calculating the spectral fluctuation index and signal attenuation index of the current lead loop; calculating the signal integrity index and determining its applicability through an index mapping model; and deducing the maximum allowable length of the lead based on a target performance threshold, outputting the optimal recommended lead length or triggering an over-limit alarm while meeting the lower limit of the physical distance. This invention can quantify the lead transmission performance and achieve length optimization through a single measurement, effectively avoiding high-frequency attenuation and standing wave distortion caused by the lead, and improving the accuracy and data consistency of frequency response testing.

The present application relates to the technical field of frequency measurement system and method, and discloses a kind of based on self-adjusting equal-precision frequency measurement system and method, comprising: CPLD and MCU;CPLD includes PLL phase-locked loop module, PLL phase-locked loop module generates required clock, including reference clock, multi-level filter clock;Parallel communication module, parallel communication module simulates Flash read-write timing, simplifies the data read-write interaction of MCU side and CPLD, while ensuring the timeliness of data interaction;Pulse filter module, pulse filter module carries out filtering operation according to the filter level set, to avoid the pulse signal acquisition error caused by high-frequency interference.The present application adopts two kinds of design methods of double-edge collection self-adjustment and collection window self-adjustment, improves the response time of frequency measurement while ensuring the frequency measurement accuracy, compared with traditional frequency measurement mode, can improve the frequency response time by a factor of two at the fastest, meet the higher control demand of industrial field for speed device, improve dynamic control performance.

This invention provides a method and apparatus for measuring the frequency of high-speed pulse signals. The frequency measurement process includes: first, the host computer configures parameters; second, the FPGA performs initial denoising on the input signal and obtains the measurement time by counting the number of reference clock cycles within the measurement time, while simultaneously recording the number of pulses measured during the measurement time; third, the microcontroller calculates the frequency value based on the measurement time and the number of pulses, and can automatically select whether to use a median moving average method for secondary denoising based on the measurement time; and fourth, the host computer reads the frequency value from the data area. The signal switching circuit of the frequency measurement device can protect the input signal and select input signals with different voltage ranges. This invention can measure the frequency of input signals with different voltage ranges, and the measurement method of this invention can significantly improve the accuracy and stability of signal frequency measurement.

An antenna arrangement configured to radiate a high-frequency measurement signal from a measurement sensor is provided, including: an antenna made of a plastic material; a waveguide made of the plastic material, in which the waveguide is integrally formed with the antenna; and a wall on an outside of the antenna that has metallization or is made of metal. A measuring device including a measurement sensor and the antenna arrangement is also provided. A method of manufacturing an antenna arrangement is also provided, the method including: providing an antenna arrangement having an antenna and a waveguide made of a plastic by an injection molding process, a micro injection molding process, a compression molding of a base body, or a 3D printing process, in which the waveguide is integrally formed with the antenna; and metallizing an exterior of the antenna to form a wall on the exterior of the antenna.

This invention discloses an ultra-wideband, high-precision instantaneous frequency measurement circuit and method, belonging to the field of frequency measurement technology. It includes a power divider group, multiple frequency measurement channels, an analog switch group, an SP3T switch, a direct digital frequency synthesizer (DDS), and an FPGA. The input RF signal is divided into four channels by the power divider group, corresponding to four frequency measurement channels. Each frequency measurement channel corresponds to a different frequency range, and the channels operate in parallel. Each channel signal is output as an LVTTL level to the FPGA after passing through a detector and comparator. The FPGA determines the frequency range based on the level combination and controls the analog switch and SP3T to select the corresponding channel. The frequency of the signal generated by the DDS is measured by the FPGA, and the input RF signal frequency is calculated inversely based on the division ratio and frequency control word. This invention achieves DC-20GHz ultra-wideband frequency measurement. The measurement speed depends on the DDS frequency switching speed. After the measurement is completed, the power to the divider is turned off to eliminate spurious interference. The circuit structure is simple and low-cost.

The application belongs to the technical field of power system measurement, and discloses a synchronous phasor standard device and a frequency precision measurement method using the same. The device uses a Beidou timing module to provide a 10MHz clock, a 1PPS second pulse and an IRIG-B code, and is combined with a synchronous phasor signal source, a proportional conversion standard device and a double-channel sampling system to form a high-precision synchronous sampling platform. The method is aimed at the frequency measurement error of a synchronous phasor measurement unit, and first removes the direct current offset of the sampling signal and segments the sampling signal, then uses a fast Fourier transform to obtain an initial frequency estimation, constructs a residual square sum optimization model within the set amplitude, frequency and phase boundary, and obtains an optimal frequency estimation through iterative solution, and further calculates a frequency change rate.