186 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 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 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 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.

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 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.

The application discloses a bearing-frequency-based target passive tracking trajectory division method, and belongs to the technical field of underwater multi-target tracking of passive sonar.The application aims to solve the problem of poor tracking effect of the existing method in the presence of target trajectory intersection scenes.The application introduces a frequency measurement value into a target state to obtain a bearing-frequency augmented state vector under the condition of passive tracking of a single observation platform in the presence of the underwater multi-target tracking trajectory intersection scenes.Bearing-frequency joint information can improve the discrimination degree of the solution of the posterior probability of the measurement value corresponding to the target, so that the correctness of batch division of the target in the trajectory intersection case is improved.Combining with an RB particle filter, a multi-hypothesis tracking technology and a Kalman smoothing filter technology, good target tracking effect is achieved, and the correctness of the tracking result is ensured.The method can be applied to the technical field of underwater multi-target tracking.

The frequency measurement method comprises: a first output step for outputting a first excitation signal in a first frequency range to a servo system (20); a first frequency characteristic calculation step for calculating a first frequency characteristic of the servo system (20) within a first frequency range on the basis of a first identification input signal and a first identification output signal acquired at a first sampling period from the servo system (20) to which the first excitation signal is input; a second output step for outputting a second excitation signal to the servo system (20), said second excitation signal having a second frequency range that is a partial range of the first frequency range and being generated on the basis of the first frequency characteristics; and a second frequency characteristic calculation step for calculating a second frequency characteristic of the servo system (20) within a second frequency range on the basis of a second identification input signal and a second identification output signal acquired at a second sampling period equal to or greater than the first sampling period from the servo system (20) to which the second excitation signal is input.

The application discloses a kind of frequency guidance-based array signal space-frequency information fusion processing method and device, applied to field programmable gate array (FPGA), by obtaining the multiple array signals for carrying out target detection received by target radar array;Any one of the multiple array signals is subjected to frequency detection, and at least one target frequency value is obtained;At least one target frequency value is subjected to frequency conversion filtering according to the multiple array signals, and at least one target array signal corresponding to at least one target frequency value is obtained;At least one target array signal is subjected to angle of arrival estimation, and at least one angle of arrival is obtained;According to at least one target frequency value and at least one angle of arrival, the corresponding relationship of target frequency value and angle of arrival is determined.The application utilizes single-channel signal to carry out frequency measurement, and then carries out filtering processing to multiple array signals and carries out angle of arrival estimation, and subsequent frequency retrieval is not necessary, and the FPGA resource utilization is improved.

The invention provides a flexible DC power transmission line fault distance measurement method and system and a storage medium, and the method comprises the steps: obtaining line voltage time sequence data, carrying out the decoupling based on the line voltage time sequence data, and obtaining an original line mode signal; based on the original line mode signal, performing disturbance processing under a random noise set to obtain a noise adding signal corresponding to each random noise in the random noise set; wherein the random noise set comprises a plurality of random noises with different intensities; based on the noise adding signal corresponding to each random noise, performing frequency measurement processing to obtain a spectrum peak frequency set; performing clustering processing based on the spectrum peak frequency set to obtain an inherent frequency set; and based on the inherent frequency set, obtaining a fault distance under a preset distance calculation strategy. According to the invention, disturbance processing is carried out on the original line mode signal under the random noise set containing a plurality of random noises with different intensities, and the feature distribution of the noises in the original line mode signal is influenced, so that the interference of false spectral peaks on the frequency measurement process is reduced, and the accuracy of a fault distance measurement result is improved.

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 present application relates to the technical field of data preprocessing, and provides a power system frequency measurement data preprocessing method and system, which comprises: obtaining measurement data and dividing into several intervals; for each interval, detecting pulse noise points, determining the size of a first window according to the ratio of the number of pulse noise points to the total number of all data points in the interval, and performing median filtering on the detected pulse noise points in the interval by using the first window according to the size of the first window; selecting a second window, and suppressing Gaussian noise by weighted mean filtering according to the similarity between any data point in the second window and the center point of the window. The three factors of noise reduction effect, feature protection and calculation speed are considered.

The invention provides a power system frequency measurement method and system based on a clamping theorem. The method comprises the following steps: carrying out real-time sampling on a system voltage signal at a fixed sampling frequency fs; determining whether a zero-crossing interval exists or not according to the sign of the sampling value; when the zero-crossing interval exists, calculating a difference value of adjacent points, and judging whether the difference value of the adjacent points meets a preset similarity condition or not; when a preset similarity condition is met, judging that the zero-crossing interval is valid based on a clamping theorem, and calculating an accurate zero-crossing moment Tn by adopting linear interpolation; and calculating the system frequency according to the current zero-crossing time Tn and the previous zero-crossing time T0. According to the invention, a clamping theorem is adopted, and a sine wave signal of a zero crossing point is replaced by a linear signal, so that the influence of the following conditions on frequency calculation and abnormal conditions of point loss, repeated points and the like caused by burrs, jump and communication errors brought by electromagnetic interference can be avoided.

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.