61 results about "Frequency discrimination" patented technology

The invention discloses a dual-wavelength polarization tuning interference spectrum frequency discrimination device and a synchronous frequency locking method, and the method specifically comprises the steps: enabling a polarization Michelson interferometer to divide incident laser into two beams of linearly polarized light through a plurality of achromatic wave plates and a polarization splitting prism, and enabling the two beams of linearly polarized light to form dual-wavelength circularly polarized light for output after the two beams of linearly polarized light are reflected and combined; the output light is divided into two beams after passing through a light splitting module, and the two beams are respectively collected and processed into a four-quadrant synchronous phase-shifting interferogram by a polarization camera after passing through an achromatic lens, and the wavefront phase difference is calculated in real time; the other beam is compensated by the rotary linear polarizer and then is received by the detector; through the corresponding relation between the wavefront phase difference and the rotation angle, the rotation linear polarizer is driven in real time to carry out phase compensation, so that polarization tuning and frequency locking are realized; meanwhile, a piezoelectric mirror bracket control signal is obtained through calculation, and interferometer parallelism error correction is carried out. According to the invention, synchronous real-time monitoring and active feedback locking of dual-wavelength interference signals can be realized, and the system has the advantages of high tuning resolution and accurate data.

The invention relates to a satellite navigation signal weak signal tracking loop switching method. The method comprises the following steps: designing a loop filter of a double-frequency phase-locked loop, a loop filter of a double-frequency frequency-locked loop and a loop filter of a pilot component single-frequency frequency-locked loop based on a Kalman filtering algorithm; constructing observed quantity and state quantity of a Kalman filter based on phase discrimination, frequency discrimination and code discrimination results of the B2a signal and the B1I signal; the state quantity output by the loop filter is fed back to a local carrier generator and a composite spreading code generator for error correction; in the filtering process, the adopted loop filter is switched according to the carrier-to-noise ratio, the phase locking detection index and the frequency locking detection index of the two signals, the corresponding loop filter is adaptively selected to complete parameter estimation, loop locking is further carried out, and signal tracking and positioning are achieved.

The present invention provides a frequency discrimination method of a difference frequency multiplication integral linear transformation network, which belongs to the field of signal processing technology. The method comprises the following steps: setting a first preset difference frequency signal u s1 (τ) and the second preset difference frequency signal u s2 (τ), receiving FM signal u i (τ), the received FM signal u i (τ) are respectively related to the first preset difference frequency signal u s1 (τ) and the second preset difference frequency signal u s2 (τ) performs multiplication and integration operations to obtain the first operation result u n1 and the second operation result u n2 , take the first operation result u n1 and the second operation result u n2 The modulation signal is obtained by performing a linear transformation. The present invention makes the debugging of the frequency discrimination system simpler and more convenient. The preset difference frequency signal can be flexibly selected according to the actual application. The initial phase of the frequency modulation signal is eliminated during the transformation, which has no impact on the frequency discrimination accuracy. The bandwidth requirement of the frequency modulation signal is low, which can meet more special applications.

The present application relates to the technical field of laser frequency stabilization, and discloses a method for calculating the frequency discrimination slope of a PDH frequency stabilization system, comprising the following steps: obtaining the waist position and size of an incident light beam, the waist position and size of a resonant cavity, and the loss and reflectivity of the resonant cavity; determining whether the waist position and size of the incident light beam match the resonant cavity; and then calculating the frequency discrimination slope through different formulas according to the matching of the waist position and size of the incident light beam and the waist position and size of the resonant cavity, which is simpler, and the parameters of each formula are easy to obtain, with high calculation efficiency and high accuracy.

The invention discloses a frequency locking and frequency discrimination integrated device of a Doppler laser radar. The frequency locking and frequency discrimination integrated device comprises a pulse light source module, a receiving front light path module and a frequency locking and frequency discrimination module. The pulse light source module emits frequency-tunable pulse laser as a frequency-locked optical signal; receiving an echo optical signal from a detection target collected by the front optical path module; the frequency locking and frequency discrimination module is an integrated optical path, and through cooperation of a 1 / 2 wave plate, a beam splitter, a 1 / 4 wave plate, a polarizing beam splitter, a reflector, a dual-channel Fabry-Perot etalon and other elements, polarization state cooperative regulation and frequency discrimination are carried out on two paths of signals, and cascade multiplexing of echo signals is realized. Through the integrated design, the problem of system complexity caused by separation of a frequency locking link and a frequency discrimination link is solved, the echo signal utilization rate is improved, the receiving efficiency of the system is improved by more than one time through cascade multiplexing of reflected signals, meanwhile, an independent frequency locking channel is omitted, the system architecture is remarkably simplified, and the stability and the wind speed inversion precision are improved.

The application discloses a frequency synchronization method of coherent clock system in high-speed data transmission, and a frequency synchronization method and equipment structure for providing high-precision time-frequency reference transmission and 10Gbps data stream transmission. A high-speed modulator is used to generate a radio frequency signal at a local end and a remote end, and the radio frequency signal is received from the opposite end. A carrier tracking technology is used to recover the radio frequency carrier, and a frequency discrimination and phase discrimination value is obtained through a signal processing algorithm in a digital domain. The local frequency discrimination and phase discrimination value is sent to the remote end, the remote end uses the local value and the opposite value to realize joint phase discrimination, and then the joint phase discrimination is sent to a loop filter. The loop filter outputs a voltage control signal, and the remote end uses the voltage control signal to control a voltage-controlled crystal oscillator, so that the frequency synchronization between the remote end and the local end is realized. The method can realize single-fiber single-wavelength bidirectional time-frequency synchronization and high-speed data transmission, can fully utilize the optical wavelength resources of the optical fiber transmission system, and can save the optical wavelength resources compared with the traditional method, and has higher frequency synchronization precision.

This invention discloses an initial frequency identification method for a frequency conversion wireless charging system. The method comprises: S1, power-on initialization; S2, signal acquisition and processing; S3, timing value capture; S4, waveform type identification and phase angle calculation; S5, initial frequency identification and adjustment. Steps S2 to S5 are repeated until the switching frequency is adjusted to a preset range and meets the soft-switching conditions, thus completing the initial frequency identification. This invention relates to the fields of power electronics and wireless charging technology.

The invention discloses a frequency discrimination curve calibration system, method and device, and relates to the technical field of laser remote sensing, the system locks the output laser frequency of a first laser on a low-concentration atom or molecule absorption peak to obtain an accurate frequency standard; the laser output by the second laser device and the laser output by the first laser device are subjected to beam combination beat frequency, a frequency difference is extracted from a beat frequency signal power spectrum to generate a tuning control signal of the second laser device, and the output laser frequency of the second laser device is locked at any preset frequency offset; the whole laser radar system utilizes an electric control optical switch to realize conversion between a calibration state and a detection state: in the calibration state, laser from the second laser is gated for frequency discrimination curve calibration; and in a detection state, gating the received atmospheric echo signal light for atmospheric remote sensing detection. Therefore, on the basis of ensuring the calibration precision and stability of the frequency discrimination curve, the calibration cost of the frequency discrimination curve is reduced, and the calibration efficiency of the frequency discrimination curve is improved.

This invention discloses a steady-state tunable dual-wavelength generation method based on laser phase-locked loop (PLL), belonging to the field of microwave photonics technology. It includes carrier-suppressed optical double-sideband modulation, a laser PLL, and optical wavelength control. Carrier-suppressed optical double-sideband modulation: the reference signal generated by the reference laser directly drives the modulator, which operates at the carrier suppression point, modulating the RF source onto the two sidebands of the reference signal, providing two reference wavelengths for dual-wavelength generation. Costa laser PLL: based on Costa PLL technology, frequency capture and phase locking of the signal light to the reference light are achieved. Optical wavelength control: digital frequency discrimination is used to track the frequency and phase difference between the signal light and the reference light, controlling the signal light wavelength to remain consistent with the reference light wavelength. This invention solves the frequency drift problem caused by using two independent light sources, and by combining optical frequency doubling, achieves steady-state tunable dual-wavelength generation, thereby supporting the generation of high-quality millimeter-wave signals.

The application discloses a kind of automatic frequency tracking method and system based on sweep mode, frequency is swept by the way of combination of " rough sweep+fine sweep ", first by " rough sweep " of big step, " rough sweep " is the method of difference of adjacent frequency point reflected voltage to judge sweep direction, determine a smaller frequency range containing inflection point, in this frequency range, small step " fine sweep " is used, compare the size of each frequency point reflected voltage, the frequency point corresponding to the minimum reflected voltage is the resonant frequency point of accelerating tube.The application compared with traditional frequency discrimination type automatic frequency tracking method, on the basis of ensuring sweep precision, improve sweep efficiency, can quickly obtain the actual resonant frequency of accelerating tube.

The invention provides a distance zero value self-correcting method based on a radio frequency agile transceiver chip. The distance zero value self-correcting method comprises the following steps: configuring the radio frequency agile transceiver chip into a dual-channel mode; a manual gain control mode is selected as a receiving channel gain control mode of a radio frequency agile transceiver chip, and gain values of a working branch receiving channel and a self-correcting branch receiving channel are manually set to be the same; a radio frequency output signal of a transmitting channel Tx2 of the self-correcting branch is connected to a radio frequency receiving end of a receiving channel Rx2 after being subjected to down-conversion and solid attenuation processing; tone-FM single tone frequency modulation is adopted for signal modulation of the transmitting end of the self-correcting branch; single-tone frequency modulation signal demodulation is carried out at the receiving end of the self-correction branch, a single-tone signal is recovered from the received signal through a frequency discrimination technology, phase comparison is carried out on the recovered single-tone signal and an original single-tone signal output by the transmitting end of the self-correction branch, and a distance zero value of the self-correction branch is obtained; and compensating a radio frequency output signal of a transmitting channel Tx1 and a radio frequency signal of a receiving channel Rx1 of the working branch according to a ranging zero value obtained by the self-calibration branch.

The application discloses a kind of dual-frequency modulation transfer spectroscopy laser frequency stabilization device and method, construct the dual-frequency modulation signal including first frequency component and second frequency component, according to dual-frequency modulation signal driving fiber electro-optic phase modulator to laser is carried out dual-frequency electro-optic phase modulation;Photoelectric detector carries out detection to the polarized beam splitter output light and obtains saturated absorption signal, to saturated absorption signal in turn carries out quadrature demodulation and low-pass filter processing and obtains first error signal and second error signal, first error signal and second error signal are superimposed to obtain dual-frequency error signal;Further, tunable laser is carried out closed-loop feedback control, realizes laser frequency stabilization.The application obtains two different frequency components error signal using dual-frequency modulation transfer spectroscopy detection technology, improves slope and intensity by adding operation, improves frequency discrimination sensitivity and anti-interference ability, is conducive to peak search determination and realizes the precision locking of laser frequency to rubidium absorption peak, with good practicability.

The invention provides a coherent OCM optical power detection method and device, and the method comprises the steps: obtaining a frequency prediction model through training, and setting a calibration relation curve between a wave lock parameter and frequency of local oscillation light; continuously outputting local oscillation light with different frequencies at a preset frequency interval, and dividing the output local oscillation light into frequency discrimination local oscillation light and frequency mixing local oscillation light; obtaining a current corresponding wave lock parameter according to the frequency discrimination local oscillation light; obtaining a frequency corresponding to a wave lock parameter according to the calibration relation curve and a frequency prediction model, and taking the frequency as a current actual frequency; performing frequency mixing on the frequency mixing local oscillation light and signal light to obtain a differential signal, and obtaining the optical power of the current signal light according to the differential signal and the current actual frequency; on one hand, the emitting time interval of the local oscillation light is reduced by continuously outputting the local oscillation light with the preset frequency interval, and the detection efficiency is improved; and on the other hand, the local oscillation light frequency is predicted through the frequency prediction model, so that the accuracy of light power detection is improved.

The invention provides a model training method for removing nonlinear echoes and display equipment, and the method comprises the steps: obtaining a first audio signal, eliminating a linear echo signal in the first audio signal, obtaining a second audio signal, extracting a nonlinear distortion feature, a time-frequency discrimination feature, a convolution feature and a time sequence dynamic feature of the second audio signal, and carrying out the recognition of the nonlinear echoes. And feature fusion is performed to obtain a first fusion feature, and then the first fusion feature is input into the long-short-term memory network to obtain a predicted time-frequency graph, so that two continuous layers of long-short-term memory networks are iteratively trained based on the predicted time-frequency graph and the training loss of the nonlinear echo tag to obtain a target model. According to the method, the second audio signal is obtained by removing the linear echo signal, and the model is trained in a mode of performing multi-dimensional feature extraction and fusion on the second audio signal, so that the model can accurately separate the human voice signal and the nonlinear echo signal, and the calculation complexity when the nonlinear echo signal is removed can be reduced.

The invention discloses a fuzzy PID (Proportion Integration Differentiation) control method for an automatic frequency locking system of a laser, which comprises the following steps of: mixing a signal detected by a cavity-front photoelectric detector with a path of radio frequency driving reference signal of an electro-optical modulator to obtain a frequency discrimination error signal and an error signal change rate; after sampling by an analog-to-digital converter, inputting into a fuzzy PID (Proportion Integration Differentiation) controller based on a microprocessor, carrying out fuzzification processing, fuzzy reasoning and defuzzification operation, and outputting a proportionality coefficient increment, an integral coefficient increment and a differential coefficient increment; control parameters are calculated, the driving voltage of the piezoelectric ceramic PZT is adjusted according to the control parameters, the output frequency of the laser is changed, and automatic frequency locking of the laser is achieved. According to the invention, the proportional control parameter, the integral control parameter and the differential control parameter are calculated through the fuzzy PID controller, the output frequency of the laser is adjusted according to the control parameters, automatic frequency locking of the laser is realized, and the control precision and robustness of the frequency locking system are improved.

An adaptive current generation circuit includes an inverter drive chain, a frequency divider, a frequency detector, a low-pass filter, a static comparator group, and a controllable current mirror. An input analog signal of the input buffer is converted into a frequency discrimination voltage in a direct current form sequentially through conversion of the inverter drive chain, frequency division of the frequency divider, frequency detection of the frequency detector, and conversion of the low-pass filter. Then the static comparator group performs a plurality of times of comparison to obtain N bits of digital codes. Finally, the controllable current mirror is controlled by using the N bits of digital codes. The controllable current mirror provides a magnitude-adjustable input current for the input buffer under control of the N bits of digital codes. A magnitude of the input current is positively correlated with a frequency of the input analog signal.

The application provides a four-channel Fabry-Perot frequency discrimination module closed-loop feedback control system, which comprises a laser, a four-channel Fabry-Perot frequency discrimination module and a control module; the four-channel Fabry-Perot frequency discrimination module comprises three optical channels composed of Fabry-Perot etalons and a fourth channel allowing laser to be completely transmitted; two of the three optical channels are used as frequency discrimination channels, and the other one is used as a locking channel; the locking channel and the fourth channel respectively receive laser signals emitted by the laser and transmit the transmitted laser signals to the control module; the control module calculates the transmittance of the locking channel according to the signal intensity of the laser signals transmitted through the two channels, and generates a driving signal according to the preset transmittance to adjust the mirror distance of the three optical channels, so as to realize the locking of the transmittance of the locking channel. The application effectively reduces the influence of laser frequency jitter, external environmental temperature change and vibration factors on frequency discrimination, and improves the frequency discrimination precision and reliability.

This application discloses a system, method, and apparatus for frequency discrimination curve calibration. Frequency locking technology is employed to stably lock the output laser frequency of the seed laser onto the absorption peak of the atomic / molecular absorption cell, effectively solving the problem of seed laser frequency drift. Simultaneously, two acousto-optic modulators are used to perform precise extracavity passive frequency modulation of the seed laser, shifting the laser frequency from the atomic / molecular absorption peak position to the preset zero-velocity frequency point and the edge frequency point of the linear operating region of the optical frequency discriminator. During calibration, the telescope is vertically pointed towards the zenith, providing atmospheric echoes with zero Doppler shift as a reference. At this time, the optical frequency discriminator measures and records the transmittance at the preset zero-velocity frequency point at the center of the linear operating region and at the edge frequency point. Based on the linear assumption of the frequency discrimination curve, a new frequency discrimination curve can be derived.

The application discloses a chipped wavelength standard device and a preparation method thereof, and belongs to the field of wavelength standards. The device comprises a frequency discrimination module, a pumping module, a locking module and a substrate. The frequency discrimination module comprises a MEMS atomic gas chamber, a micro-ring resonant cavity and a photodetector; the pumping module mainly comprises a laser and a control circuit thereof; the locking module comprises a phase-locked amplifier, a reference signal source and a PID circuit. The substrate comprises a copper or ceramic heat sink and a TEC temperature controller. The application combines the micro-ring resonant cavity and the MEMS atomic gas chamber, directly pumps the micro-ring resonant cavity integrated optical path by the laser, locks the laser wavelength on the micro-ring resonant cavity resonance peak based on the micro-cavity self-injection locking method, reduces the laser noise and realizes the laser linewidth compression. The micro-cavity evanescent field excites the atomic transition in the atomic gas chamber, and the frequency is discriminated by detecting the fluorescence. The laser frequency is locked by controlling the laser current and the micro-cavity temperature through the frequency discrimination signal, and the chip-level wavelength metrology and value traceability are realized.

The invention discloses a laser frequency stabilization method and device based on a saturated fluorescence spectrum, and belongs to the technical field of laser frequency stabilization. According to the method, a frequency discrimination signal of a low atomic density or low absorption system is generated by using a saturated fluorescence spectrum; the saturated fluorescence spectrum of atoms is sunken at the resonance position by utilizing opposite laser, so that the influence of Doppler effect is eliminated; a derivative of a saturated fluorescence spectrum is extracted as a frequency discrimination signal by using a method of modulating pump light and then demodulating a fluorescence signal; and a lens and a reflecting mirror are arranged on the opposite side of the PD to collect the fluorescence and then reflect the fluorescence, so that the PD can collect the fluorescence with double intensity. According to the scheme, a fluorescence signal which is enhanced from zero is directly detected, so that the signal-to-noise ratio is extremely high, and meanwhile, the problem of long-term frequency drift is eliminated; and the hot atom device is adopted, a high vacuum environment is not needed, the complex precise temperature control requirement is also avoided, and the device adopting the scheme is simpler in structure and low in cost.

The invention discloses an ocean optical parameter detection method and system based on high-precision frequency discrimination. A receiving optical system in the system focuses laser scattering echoes of a water body and then collimates the laser scattering echoes into parallel light beams; the narrow-band interference filter filters background light outside the bandwidth in scattered echoes, and the scattered echoes are divided into a reflection light path and a transmission light path through the ultra-narrow-band Fabry-Perot filtering device; light of the reflection light path is focused, collimated and expanded into parallel light beams, the light beams pass through a polarization beam splitter, and the light of a horizontal polarization component of the light beams sequentially passes through a first group of beam shrinking and expanding units, a four-step etalon and a second group of beam shrinking and expanding units and is sent to a four-channel high-sensitivity detector for detection; light of the transmission light path is focused to a point element photoelectric detector for detection; and the comprehensive control and data processing unit calculates a 180-degree backscattering coefficient and a diffusion attenuation coefficient of the water body by using signals output by the four-channel high-sensitivity detector and the point element photoelectric detector.

The application discloses a kind of based on CPT effect microcavity double optical comb frequency stabilization device, two self-injection locking microcavity optical comb are used to obtain microcavity double optical comb, and microcavity double optical comb pump light source is locked;The repetition frequency of double optical comb is independently controlled by the way of radio frequency injection locking;Utilize microcavity double optical comb vernier effect, obtain the double optical comb comb teeth pair that can stimulate CPT effect, utilize atomic absorption peak to generate comb teeth frequency discrimination signal, feedback to pump light, so that pump light reference to the Doppler absorption peak of atom;The repetition frequency of one optical comb is referenced to comb teeth beat signal, and frequency discrimination signal is generated using CPT effect, and the repetition frequency of another optical comb is locked, so that the frequency difference of double optical comb comb teeth pair is locked to CPT resonance peak.The application can compensate the frequency difference between microcavity optical comb repetition frequency and microwave atomic frequency stabilization frequency by double optical comb vernier effect, realize the integration and miniaturization of frequency stabilization system, reduce the complexity of frequency stabilization system.

This disclosure relates to a frequency discrimination circuit, a clock correction circuit, a chip, and an information processing device. The frequency discrimination circuit includes a comparison module, a reference module, and a switched capacitor module. A first input terminal of the comparison module is electrically connected to the switched capacitor module, and a second input terminal of the comparison module is electrically connected to the reference module. The switched capacitor module outputs a voltage to be measured to the first input terminal of the comparison module based on the frequency of the signal to be corrected input to the frequency discrimination circuit. The reference module outputs a reference voltage to the second input terminal based on a preset reference frequency. The comparison module outputs a comparison result based on the voltage values ​​at the first and second input terminals. The frequency discrimination circuit provided by this disclosure simplifies the internal circuit structure of the frequency discrimination circuit, thereby reducing its manufacturing cost.

The invention provides a pedestrian dead reckoning method based on a bimodal odometer. The method comprises the following steps: firstly, constructing a frequency discrimination magnetic field odometer f-MOR by using double magnetometers and an IMU; fFT conversion is carried out on forward and backward magnetic signals output by the double magnetometers, the time difference of the double magnetometers is determined by using the maximum frequency amplitude f and the phase, and then an f-MOR speed measurement value is calculated based on the time difference; the time difference is determined in the more stable frequency domain of the signal, direct measurement and brute force matching of DTW on geometric correlation of the signal are avoided, and the speed measurement precision is higher. And then, constructing a state transition model about a step size scale factor error and an f-MOR speed error, constructing observation by using a difference between a speed integral of the f-MOR in a single-step interval and a BOR step size measurement result, and estimating an error state through a Kalman filter, so that the step size error is compensated with relatively high precision, and the positioning precision of autonomous navigation is effectively improved.

A high-precision reconstruction system of laser Brillouin scattering spectrum based on image, comprising a back echo beam expansion and shaping unit, a frequency discrimination unit, an optical path switching device, an image sensor, an image acquisition and data processing unit. The back echo beam expansion and shaping unit shoots the scattered echo after beam expansion and collimation into the frequency discrimination unit; the frequency discrimination unit carries out multi-beam interference on the scattered echo after beam expansion and collimation, forms linear interference fringes and then emits; the optical path switching device reflects the linear interference fringes to the image sensor and photosensitizes on the image sensor; the image acquisition and data processing unit acquires the photosensitization result, processes by an interference spectrum extraction algorithm to obtain the device function and wedge angle corresponding to the interference fringes. The application adopts the image sensor to replace the multi-channel photoelectric detector to receive the calibration interference fringes, improves the spatial resolution of calibration reception and improves the calibration accuracy.

The application provides a phase shift fiber grating demodulation system based on a laser frequency stabilization system, which comprises a laser frequency stabilization system for long-term frequency offset locking of laser emitted light; wherein the laser frequency stabilization system comprises an optical frequency comb and a heterodyne interference optical path, the optical frequency comb is connected with the heterodyne interference optical path and is used for receiving the light emitted by the laser; the laser frequency stabilization system further comprises a photoelectric detector, a frequency discrimination circuit and a frequency-voltage conversion circuit, the photoelectric detector is used for converting the light passing through the heterodyne interference optical path into an electric signal; the frequency discrimination circuit is connected with the photoelectric detector and is used for receiving the electric signal; the frequency-voltage conversion circuit is connected with the frequency discrimination circuit and is used for converting the electric signal into an error voltage signal; a PC control host acquires the error voltage signal and outputs a feedback control signal to perform long-term frequency offset locking on the laser emitted light. The application can improve the long-term stability of the laser by multiple orders of magnitude and can realize long-term frequency offset locking.

The application discloses a single-phase phase-locked loop capable of eliminating the influence of double frequency, which comprises a double frequency elimination frequency discrimination module and a phase angle estimation module. The double frequency elimination frequency discrimination module generates a frequency discrimination signal without the influence of double frequency through mathematical processing, and then inputs the frequency discrimination signal into the phase angle estimation module with PI control and integrator, so that the real-time phase angle of the phase-locked loop is estimated by the phase angle estimation module. The phase-locked loop of the application is designed with the frequency discrimination module and the phase angle estimation module, so that the influence of the double frequency component on the phase-locked result in the steady state of the phase-locked loop is eliminated, and meanwhile, the dynamic response performance of the phase-locked loop is ensured. The application is used for online accurate estimation under non-ideal power grid conditions.

The invention discloses a carrier closed-loop tracking method and system based on phase cycle slip correction. The system comprises a coherent frequency mixing module, an integral zero clearing module, a phase frequency detection processing module, a phase cycle slip correction module and a loop filtering module. And performing frequency and phase detection processing on the obtained in-phase branch output I (m) and the orthogonal branch output Q (m) to obtain a frequency detection result and a phase detection result, performing phase cycle slip correction on the phase detection result, outputting a phase cycle slip correction result, finally, sending the phase detection result to a loop filtering module, outputting a carrier frequency to a carrier NCO in a coherent frequency mixing module to update a local carrier frequency, and performing phase detection on the coherent frequency mixing module. Therefore, closed-loop tracking of the carrier is formed. According to the invention, the phase identification range of a closed-loop tracking system is widened, so that the phase identification range is not limited to a single-cycle phase interval of [-pi, pi], and the tracking oscillation or lock losing probability when cycle skipping occurs to the carrier phase is greatly reduced.

The invention belongs to the technical field of electronic measurement, and particularly relates to a high-precision clock phase frequency detection system and method. The invention discloses a high-precision clock phase frequency detection system, which comprises the following modules: a clock input and preprocessing module for receiving a reference clock signal and a detected clock signal, and shaping, de-jittering and synchronizing the clock signals; the frequency measurement module counts a reference clock and a measured clock, and the reference clock generates an adjustable gate signal; the phase measurement module adopts a time-to-digital converter technology; and the data processing and control module is used for controlling the whole measurement process. According to the invention, the tradeoff limitation between precision and speed in traditional frequency measurement is broken. Through the self-adaptive gate time technology, the system can automatically adjust the gate time according to the characteristics of the input signal, so that the measurement precision is greatly improved while the measurement speed is ensured.

The application discloses an amplifier system performance optimization method and system, and specifically comprises the following steps: a frequency discrimination module is used to acquire the frequency parameter of a signal to be amplified; a control module is used to acquire the corresponding target bias voltage in a preset frequency-voltage table according to the frequency parameter; and a bias voltage adjustment module is used to adjust the bias voltage of an amplifier to the target bias voltage, so that the frequency of the signal reaches a target adjustment value after being amplified by the amplifier. The application adjusts the bias voltage of the amplifier, and then adjusts the output signal, so that the amplifier can adapt to power requirements in various different scenarios.