397 results about "Atomic clock" patented technology

The invention discloses a multichannel high-precision PAF signal synchronous acquisition system and a multichannel high-precision PAF signal synchronous acquisition method, and relates to the technical field of phased array signal acquisition and processing, the multichannel high-precision PAF signal synchronous acquisition system is characterized in that a hydrogen atomic clock time-frequency distribution module is in signal connection with a plurality of signal acquisition processing boards, and each signal acquisition processing board comprises a double-loop phase determination clock circuit and an RFSoC circuit; and the double-loop phase determination clock circuit is in signal connection with the RFSoC circuit. The time-frequency distribution module adopts a time-frequency signal output by a hydrogen atomic clock as a reference, so that the synchronization precision is ensured; the clock architecture of the acquisition processing board card adopts a phase determination mode, so that a Tile clock and a PL logic clock in the board are strictly in phase with an external input reference clock, and ADC acquisition synchronization of all channels is ensured; a phase clock circuit design is determined by adopting double loops, and all output clocks and an input reference clock keep a strict phase relationship; the system adopts a three-step synchronization process, so that the synchronous acquisition of hundreds of paths of PAF signals reaches the ps-level precision.

The invention relates to the technical field of atomic clock control, and discloses a punctuality type atomic clock control method based on a microwave frequency band. The method comprises the following steps: firstly, acquiring microwave frequency band signal data and atomic state data, and constructing a time calculation model in combination with historical operation data to output a theoretical time value; performing multi-dimensional difference analysis on the theoretical time value and the actual measurement time value to generate a time difference coefficient matrix; inputting the matrix into a spatial propagation analysis network, and combining atomic clock component parameters and environmental parameters to generate a time anomaly probability distribution diagram; and finally, configuring microwave control parameters according to the distribution diagram, including starting a high-frequency monitoring mode for a high-probability abnormal region and applying a disturbance test to adjacent frequency bands. According to the method, through multi-dimensional data modeling, difference analysis and dynamic parameter configuration, the accuracy and adaptability of atomic clock control are improved, and the operation stability of the atomic clock in a complex environment can be enhanced.

The invention discloses a power grid system time service method and system based on a Beidou satellite, and relates to the technical field of power grid system time service, and the method comprises the following steps: obtaining a Beidou satellite signal through a Beidou ground control center, and generating a time frequency reference signal; transmitting the time frequency reference signal to each level of node through a communication network of a power system; and deploying a Beidou time service processing module in local side equipment of the power system, processing the received time frequency reference signal, and generating a system clock signal consistent with the Beidou satellite time reference. According to the invention, triple guarantee is formed through Beidou satellite signals and a dual-channel transmission architecture, i.e., an optical fiber channel and a power line carrier channel; when any transmission channel has a fault, the redundancy switching module automatically selects an optimal path, namely a time delay deviation gt is passed; the threshold triggers switching, and after the Beidou signal is interrupted, a hierarchical timekeeping strategy (atomic clock-adjacent node synchronization-power frequency synchronization) is started.

The invention provides a crystal oscillator and an atomic clock, and relates to the technical field of oscillators, the crystal oscillator comprises a packaging cavity, a crystal, a temperature sensor and a cantilever beam assembly, the crystal, the temperature sensor and the cantilever beam assembly are arranged in a containing cavity of the packaging cavity, and the packaging cavity is of a vacuum packaging structure. The crystal and the temperature sensor are arranged on the cantilever beam assembly, the crystal and the temperature sensor are electrically connected with different connection points of the packaging cavity through the cantilever beam assembly, and the temperature sensor is arranged around the crystal; the cantilever beam assembly comprises a heating module, and when the temperature sensor monitors that the temperature of the area where the crystal is located is smaller than a preset temperature threshold value, the heating module heats the crystal. The energy loss of air damping to the high-frequency vibration of the crystal is eliminated, the Q value is improved, and the phase noise suppression capability is enhanced; accurate control over the temperature of the area where the crystal is located is achieved, the thermal response speed and the temperature control precision are improved, and the problem that an existing crystal oscillator is poor in stability is solved.

The invention relates to the technical field of spacecraft autonomous time keeping, and discloses a satellite autonomous clock error estimation method, a reference establishment method, a device and a product. The satellite autonomous clock error estimation method comprises the following steps: constructing a laser communication link between satellites based on a laser communication list; any satellite carrying an atomic clock with the precision not lower than E-16 magnitude is determined as a reference satellite; calculating a target clock difference between a target satellite and the reference satellite based on a first clock difference between adjacent satellites in the laser communication link; the target satellite is any satellite except the reference satellite in the navigation satellite constellation system; and the adjacent satellites directly communicate with each other through a laser communication link. By adopting the method, a navigation constellation system running in a high orbit can realize space-based autonomous high-precision clock error estimation and clock synchronization in a global range.

The invention provides a laser interference measurement precision traceability system and method. The system comprises an atomic clock, a femtosecond optical frequency comb, a spectrum spreading and frequency doubling module, a beat frequency module and a traceability processing module. The repetition frequency of a spectrum output by a femtosecond optical frequency comb and the frequency reference of an atomic clock are locked, frequency beating is carried out on a femtosecond laser spectrum and an interference measurement light source through spectrum broadening, optical frequency doubling and frequency beating detection, and traceability comparison is carried out on an obtained frequency beating signal and laser interference measurement data. The measurement precision of the to-be-measured laser interferometer is traced to the atomic clock frequency reference, and the traceability of laser interference measurement data is realized. Compared with the prior art, the laser interference measurement precision traceability system measures the wavelength by using the atomic clock frequency reference, has higher precision and resolution, and can realize on-site traceability of laser interference measurement data precision. And through precision traceability, the precision and stability of laser interference measurement are also improved.

The present application relates to a method, device, storage medium and terminal for optimizing the drift rate of a rubidium atomic clock. The method comprises: collecting frequency difference data of the rubidium atomic clock relative to a reference signal; establishing a time-frequency difference model of the rubidium atomic clock according to the frequency difference data and the least squares method; and adjusting the output frequency of the rubidium atomic clock according to the time-frequency difference model and the voltage-frequency fitting relationship. The present application focuses on the frequency drift compensation technology for the aging of key components inside the rubidium atomic clock. By analyzing the drift rate characteristics of the rubidium atomic clock, it is proposed to adjust the accuracy of the output frequency of the rubidium atomic clock by adjusting the voltage-controlled voltage of the constant temperature crystal oscillator inside the rubidium atomic clock, thereby improving the drift rate of the rubidium atomic clock.

The invention relates to a method and device for determining a lunar gravity field by using an inter-satellite frequency signal time-frequency link, and the method comprises the steps: connecting an earth observation station, a static satellite and a lunar polar orbit satellite which are provided with an atomic clock through a satellite carrying a clock system based on a generalized relativistic theory, and carrying out the time-frequency transmission through a satellite time-frequency transmission method, the gravity potential difference between the earth and the satellite and the gravity potential difference between the satellite and the moon polar orbit satellite are measured through a gravity frequency shift method, the gravity potential data of the moon polar orbit satellite are obtained through an inter-satellite time-frequency link according to the earth gravity potential data, and then the moon gravity field is determined through a physical geodetic measurement method. Therefore, the problems that the prior art is difficult to implement on the surface of the moon and the gravity potential of the moon and the earth cannot be connected are solved.

The invention provides a satellite-borne atomic clock remote discontinuous frequency control method. The method comprises the following steps: acquiring a clock difference between a controlled satellite-borne atomic clock and a space reference clock; performing state estimation on the state quantity of the clock correction by taking the clock correction as input through a Kalman filtering algorithm; according to the clock difference state quantity output by the Kalman filtering algorithm, calculating an optimal frequency control value through an LQR control algorithm; and inputting the optimal frequency control value into the controlled satellite-borne atomic clock to realize frequency control. In this way, the problems that in the spaceborne atomic clock frequency control process, measurement noise is large, and control reference is discontinuous can be solved.

The application discloses a double-resonance atomic clock ultra-miniature substrate integrated waveguide chamber, comprising: a substrate integrated waveguide annular gap cavity, the substrate integrated waveguide annular gap cavity is formed by longitudinal stacking of a plurality of longitudinal slit substrate integrated waveguides, the longitudinal slit substrate integrated waveguide comprises a metalized through hole and a metal microstrip line, and the longitudinal slit substrate integrated waveguide is provided with a longitudinal slit; a MEMS atomic gas chamber; a mode matching excitation structure for exciting a microwave magnetic field to the substrate integrated waveguide annular gap cavity; and an electromagnetic shielding and heating assembly arranged outside the substrate integrated waveguide annular gap cavity. The application can effectively solve the key problem that the resonant performance of a printed miniature annular gap cavity is extremely sensitive to the size change of subwavelength structure parameters, increase the processing tolerance of the ultra-miniature integrated chamber, reduce the processing difficulty and manufacturing cost of high-precision PCB through holes, and improve product yield.

The invention provides a CPT atomic clock magnetic field coil constant calibration system and method.The CPT atomic clock magnetic field coil constant calibration system comprises a CPT atomic clock, a frequency measurement module and an upper computer, the upper computer is used for setting the number of times of measurement, calculating a third analog signal in each time of measurement according to a first digital signal in each time of measurement, and sending the third analog signal to the CPT atomic clock; calculating the actual clock transition frequency during each measurement according to the frequency division number of the phase-locked loop circuit and the frequency of the clock signal during each measurement, calculating the external magnetic field during each measurement according to the actual clock transition frequency during each measurement, and finally performing linear fitting according to the external magnetic field during multiple measurements and the third analog signal to obtain a third analog signal; and obtaining a magnetic field coil constant. The invention provides a CPT atomic clock magnetic field coil constant calibration system and method. The system and method are used for solving the problems that a magnetic field coil in a CPT atomic clock is small and cannot be measured, current distribution calculation is complex due to the fact that magnetic shielding is applied, and the actual winding condition of the coil cannot be accurately simulated during simulation.

The invention relates to an atomic clock frequency anomaly detection method, and belongs to the technical field of deep learning and the field of atomic clock anomaly detection. The method comprises the following steps: acquiring a frequency sequence set with a label generated by an atomic clock in a normal frequency sequence injection known abnormal mode; performing supervised training on the anomaly detection model by using the frequency sequence set; in the anomaly detection model, performing feature fusion, nonlinear transformation and classification on a first path of features extracted by performing multilayer decomposition on an input frequency sequence by adopting discrete wavelet transform and a second path of features extracted by adopting a CNN-Transformer network on the input frequency sequence, and then detecting an abnormal frequency sequence; and performing frequency anomaly detection on the atomic clock frequency sequence acquired in real time by using the trained anomaly detection model. According to the invention, high-precision detection of frequency anomalies with different characteristics is realized, the detection range is expanded, and the detection precision is improved.

The invention provides a comprehensive photoelectric platform method and system for unmanned aerial vehicle detection, electronic equipment and a storage medium, and relates to the technical field of unmanned aerial vehicle detection and localization. Synchronously triggering a photoelectric platform to capture a suspicious airspace high-definition video stream and establishing a space-time corresponding database of the two; synchronizing each radio frequency receiving node by taking a high-precision atomic clock as a time reference, and processing multiple paths of signal data to obtain a time-aligned basic signal; basic signal radio frequency features are extracted and associated with equipment identification, a mapping relation between the basic signal radio frequency features and remote controller models is established, and a hardware feature library is constructed; and finally, in combination with the library identification result, the signal time difference and the optical data, correcting a multipath error by using particle filtering, predicting and updating the position of an operator, and realizing comprehensive detection and positioning of the unmanned aerial vehicle after iterative convergence, thereby realizing comprehensive detection and positioning of the unmanned aerial vehicle in combination with radio frequency detection and optical observation.

The present invention belongs to the field of marine underwater positioning, navigation and timing. Disclosed are an underwater navigation and communication integrated position service system and method. The system comprises a buoy base station, a submerged buoy base station, a seabed base station and a shore-based operation and control unit, and the system utilizes a three-dimensional base station network observation mode combining the buoy base station, the submerged buoy base station and the seabed base station. The position service system and method in the present invention have the capabilities of underwater acoustic navigation and communication, satellite positioning and communication, atomic clock timekeeping, hydrological measurement and responding to instructions of a shore-based operation and control unit, have the functions of autonomous, real-time and online base station position and clock calibration and sound velocity field correction, have the functions of base station position and clock calibration, and sound velocity field correction and control based on the shore-based operation and control unit, and can expand the range and functions of underwater position services, and provide accurate positioning, navigation and timing services for water-surface / underwater users.

The invention belongs to the technical field of optical communication, and particularly relates to a high-stability photo-generated millimeter wave system based on a phase-locked loop, which comprises a first laser, a second laser, an acousto-optic frequency shifter, a dense wavelength division multiplexer, an inner loop feedback control loop and an outer loop signal output branch, the inner loop feedback control loop comprises a phase modulator, an optical filter, a photoelectric detector, a frequency division arithmetic unit, a phase frequency detector, a loop filter, a voltage-controlled oscillator and a first power amplifier which are sequentially connected in series, and the output of the first power amplifier is connected with an acousto-optic frequency shifter; the inner loop feedback control loop further comprises a cesium atomic clock, a microwave source and a second power amplifier; wherein the cesium atomic clock is connected with the microwave source and the phase frequency detector, and the output of the microwave source is connected with the phase modulator after passing through the second power amplifier.

The invention relates to the technical field of unmanned aerial vehicle trapping, and discloses an unmanned aerial vehicle trapping method for emitting a navigation deception signal, which comprises the following steps: step 1, generating a navigation deception signal synchronized with the time reference of a satellite navigation system through an atomic clock synchronization mechanism; step 2, injecting dynamically predicted satellite orbit parameters based on the navigation deception signal; 3, subcarrier pseudo-arbitrary frequency hopping control is carried out on the navigation deception signal with the injected parameters; and 4, collecting multi-source data of the radar and the optical sensor, and fusing the multi-source data to generate a motion track of the unmanned aerial vehicle. According to the invention, an atomic clock synchronization mechanism is adopted to generate a high-precision time reference, a technical scheme of dynamic orbit prediction and pseudo-random frequency hopping control is combined, time synchronization with a satellite system is realized through an atomic clock, satellite orbit parameters are dynamically corrected through a long and short-term memory network, and rapid hopping modulation of a subcarrier frequency band is realized. The technical effects of high space-time consistency of deception signals and dynamic disguising of spectrum characteristics are achieved.

An atomic clock system includes a waveguide cavity that is sealed and comprises a gas enclosed therein. The waveguide cavity has a length that is an integer multiple of approximately one half-wavelength of a resonant frequency of the gas between two states. An oscillator system generates an RF signal through the waveguide cavity. The RF signal has a signal frequency that is approximately equal to the resonant frequency of the gas. A detection system measures a characteristic of the RF signal through the waveguide cavity to detect a maximum transition between the two states of the gas and to provide a feedback signal to the oscillator system to lock the signal frequency of the RF signal to the resonant frequency of the gas based on detecting the maximum transition. The detection system provides a frequency reference output signal based on the signal frequency of the RF signal.

The embodiment of the invention provides a rubidium atomic clock based on a velocity grating spectrum and an implementation method, and the method comprises the steps: enabling a multi-frequency coherent laser source to emit a laser signal containing the velocity grating spectrum, and dividing the laser signal into two paths through a polarization splitting prism; the reflected light beam enters the laser frequency stabilization module to realize laser frequency stabilization; a transmission light beam enters the rubidium bubble through the lens group to interact with rubidium atoms; the photoelectric tube detects a transition spectral line, converts the transition spectral line from an optical signal into an electric signal and transmits the electric signal to the lock-in amplifier for demodulation; the integral amplification module converts the demodulated direct-current voltage into linear increasing voltage and transmits the linear increasing voltage to the crystal oscillator; the crystal oscillator generates an initial microwave signal and generates a microwave signal corresponding to the 87Rb atom through the frequency synthesizer; and the phase frequency modulation module modulates the microwave signal to obtain an error signal and transmits the error signal to the microwave resonant cavity so as to adjust the electromagnetic field according to the error signal to stably lock the rubidium atomic clock. The method is used for achieving the effect of improving the stability of the rubidium atomic clock system.

The invention discloses a power line fog penetration monitoring method, system and device based on polarization-infrared multi-mode fusion and a medium. An atomic clock is tamed to trigger infrared pulse and polarization exposure, and pixel offset caused by jitter of an unmanned aerial vehicle is compensated through an image motion analysis method; constructing a polarization physical model, and establishing a relationship between the fogdrop particle size and the polarization degree; performing multi-modal feature fusion, constructing a double-branch deep learning network, and performing output judgment on the image according to a dynamic fusion strategy; and optimizing conductor features and insulator features in the power line through a special convolution kernel, and accurately extracting target features.

The invention belongs to the technical field of satellite communication, navigation and precision measurement, and discloses a constant-temperature crystal oscillator automatic taming and calibration method and system based on GPS pulse per second, which can accurately tame and calibrate internal clocks such as a rubidium atomic clock and a 10MHz constant-temperature crystal oscillator through a GPS pulse per second signal, and adopts a novel clock synchronization algorithm to realize the automatic taming and calibration of the constant-temperature crystal oscillator. Through accurate frequency calibration and phase synchronization, high-stability and high-precision second pulse signals and 10MHz frequency clock signals are output.

The invention belongs to the field of high-precision time calibration and navigation positioning, and discloses a rubidium atomic clock calibration method based on a Rowland system and a related device. Spectral analysis is performed based on a Welch method and an adaptive peak detection method so as to accurately identify frequency, amplitude and phase parameters of periodic components, then a mixed time difference model including a secondary trend term, a multi-period term and a noise term is constructed, and the model is solved by adopting a least square method so as to obtain key performance parameters of the rubidium atomic clock. And finally completing time calibration of the Rowland system taming rubidium clock. By adopting the method, the parameter estimation precision of the rubidium clock is effectively improved, the problems of mode aliasing, noise sensitivity, non-unique result, low calculation efficiency and the like are solved, and reliable and real-time calibration of the rubidium atomic clock by the Roland system is realized.

The embodiment of the invention provides a chip atomic clock based on a speed grating spectrum and an implementation method. Comprising a multi-frequency coherent laser source, a quarter-wave plate, an atomic gas chamber, a photoelectric detector, a band-pass filter, a microwave modulation and demodulation module, a crystal oscillator, a phase-locked loop module, a bias-tree module, a DC modulation and demodulation module and a servo control module. The multi-frequency coherent laser source is sequentially connected with the quarter-wave plate, the atomic gas chamber, the photoelectric detector and the band-pass filter, the first output end of the band-pass filter is sequentially connected with the microwave modulation and demodulation module, the crystal oscillator and the phase-locked loop module, and meanwhile the microwave modulation and demodulation module is connected with the phase-locked loop module. And the second output end of the band-pass filter is connected with the DC modulation-demodulation module and the servo control module in sequence. And the bias-tree module is connected with the servo control module and the phase-locked loop module and feeds back a coupled signal to the multi-frequency coherent laser source so as to complete whole clock locking. The atomic clock is used for achieving the effect of improving the spectral line signal-to-noise ratio.

The invention relates to a photoelectric integrated double-frequency laser for coherent wind measurement, which comprises a first light source module, a second light source module, a first coupler module, a second coupler module, a third coupler module, a first beam splitter module, a second beam splitter module, a third beam splitter module and a first balanced photoelectric detector module, a second balance photoelectric detector module, a modulator module, an optical phase-locked loop module and a transceiver. Based on the silicon-based optoelectronic chip technology and the photoelectric hybrid packaging technology on the structural level, the coupler, the beam splitter and the photoelectric detector are integrated on the silicon optical chip, and the silicon optical chip, the DFB chip, the coupling optical path, the electrical module and the like are packaged together by utilizing the photoelectric hybrid packaging technology, so that high-density integration is realized; a heterodyne digital optical phase-locked loop technology is applied to a system level, so that a specific frequency difference exists between output signal light and reference light, and pulse light with a high extinction ratio is generated in a modulator cascading mode. Compared with a conventional single-light-source system scheme, the heterodyne Doppler wind measurement laser radar system can greatly improve the integration level, reduce the power consumption and the cost, and is beneficial to mass production, and compared with a homodyne detection mode, heterodyne detection is higher in measurement speed, simpler in scheme and better in stability. The system has extremely high expansibility, and can be applied to systems of optical fiber sensing, laser remote sensing and cold atomic clocks through operations of replacing a transmitting-receiving device, modifying a control program and the like.

The invention provides a method and a device for measuring a dielectric constant of a storage bubble of an atomic clock. The method comprises the following steps: starting a device for measuring the dielectric constant of an atomic clock storage bubble to obtain the actually measured resonant frequency of an atomic clock cavity bubble system; constructing a simulation model according to the state parameters of the cavity bubble system; parameter scanning analysis is carried out according to the simulation model, and a relation image of the storage bubble dielectric constant and the cavity bubble system simulation resonant frequency is obtained; determining the dielectric constant value of the storage bubble according to the measurement frequency and the simulation frequency on the relation image; the position of the tuner and the environment temperature are changed, the measurement accuracy can be improved through multiple times of measurement statistical averaging, and the relation between the dielectric constant of the storage bubble and the temperature can be analyzed. The method solves the problem that a conventional method for measuring the dielectric constant by adopting a calculation formula for inversion is lack of flexibility and has certain limitation. The method is of great significance to the optimization design of a high-performance cavity bubble system, the improvement of the temperature frequency characteristic of the atomic clock and the promotion of the development of a small light-weight active atomic clock.

The invention discloses a femtosecond optical comb large-size precision absolute distance measurement system in a complex environment. Comprising a source module, a beam splitter, a third dichroic mirror, a fundamental frequency femtosecond optical comb reference detector, a frequency doubling femtosecond optical comb reference detector, a fourth dichroic mirror, a frequency doubling femtosecond optical comb measurement detector, a fundamental frequency femtosecond optical comb measurement detector, a phase discriminator, a ranging zero point mirror and a corner reflector. The source module comprises an atomic clock, a femtosecond optical comb, an optical fiber beam splitter, a signal generator, an electro-optical modulator, a lens, a frequency multiplication module, a first collimation beam expander, a second collimation beam expander, a first dichroic mirror and a second dichroic mirror. According to the scheme, the defects that in the prior art, the measurement range is insufficient, complex industrial sites are difficult to adapt, and the real-time performance is poor are overcome, and a new way is provided for breaking through the technical bottleneck of large-range, high-precision, dead-zone-free, rapid and real-time measurement in a complex environment; and a technical support is provided for engineering application of a femtosecond optical comb precision distance measurement technology and development of a subsequent measurement prototype.

The utility model relates to the technical field of chip atomic clocks, particularly provides a micro physical system of a chip atomic clock, and aims to solve the problem that the light transmittance is affected due to the fact that a light-transmitting window of an air chamber of a chip atomic clock in the prior art is easy to pollute. In order to achieve the purpose, the miniature physical system comprises a shielding unit, a magnetic field assembly, a vacuum unit and a center assembly, and the shielding unit is provided with a shielding cavity; the magnetic field assembly sleeves the vacuum unit, and the vacuum unit is provided with a vacuum cavity; the center assembly is arranged in the vacuum cavity and comprises a heating piece, a heat transfer cylinder and an air chamber which are sequentially stacked, a receding notch is formed in the side wall of the heat transfer cylinder, and at least part of the air chamber is arranged outside the heat transfer cylinder through the receding notch. By means of the scheme, steam in the air chamber can be condensed in the air chamber outside the cylinder, the light-transmitting area of the air chamber is avoided, and the problem that the light transmittance is affected due to the fact that the steam is condensed on the light-transmitting face of the air chamber is solved.

The invention discloses a distributed radar time-frequency synchronization and transmit-receive coherent method and system, and belongs to the technical field of radars. The method comprises the following steps: connecting each transmitting station and each receiving station of the distributed radar with a synchronization device, wherein the synchronization device comprises timing system equipment, an atomic clock and wireless communication equipment; the distributed radar receives working parameters issued by the wireless communication center controller to the distributed radar by using the wireless communication equipment; according to the working parameters, the transmitting station starts to transmit a radar signal after receiving a trigger synchronization signal of the timing system equipment, and the receiving station starts to collect an echo signal based on a local oscillator signal after receiving the trigger synchronization signal of the timing system equipment; the radar signal and the local oscillator signal are both generated based on the connected atomic clock as a reference clock. According to the invention, time-frequency synchronization and transmit-receive coherence of the distributed radar can be realized by using the synchronization device, limitation of space wired connection is avoided, and the construction cost of the distributed radar is reduced.

The invention relates to the technical field of precision timing instrument testing, in particular to an atomic clock aging prediction method based on feature fusion and quantum constraint learning. According to the atomic clock aging prediction method based on multi-modal feature fusion and quantum constraint learning provided by the invention, a multi-modal tensor fusion means is adopted, and a time domain microwave probe signal, a space domain atomic cloud density distribution signal and a frequency domain lambda stripe signal are collected at the same time for feature extraction, so that the completeness of the features is improved; during nonlinear modeling, a Bloch equation constraint is adopted to ensure that a network model accords with a quantum physics rule. According to the method, the atomic clock aging feature expression effect can be improved through an artificial intelligence means, the defect of overfitting caused by purely depending on training data is effectively avoided, the atomic clock aging prediction model better conforms to the physical law, the atomic clock aging prediction precision is improved, and the prediction model complexity is optimized.

The invention discloses a Beidou PTP master clock device based on chip atomic clock timekeeping, which integrates a chip atomic clock and a Beidou satellite time service signal, and comprises the following steps: firstly, receiving a Beidou satellite signal through a satellite receiving module, and generating an accurate 1PPS signal, a TOD signal and a 10MHz frequency signal based on the satellite signal; high-precision time-frequency reference is provided for equipment, and the problem that clock precision is insufficient in a traditional clock synchronization system is solved through the design. Secondly, the first clock board and the second clock board carry chip atomic clocks, and the high stability and low power consumption characteristics of the chip atomic clocks enable the equipment to maintain high precision of clock signals during long-time operation, so that clock errors caused by crystal oscillator frequency drift and aging in a traditional system are avoided. Moreover, the communication core board is connected with the upper computer, so that instructions can be received in real time, and the clock board and the logic control board can be controlled to work, and therefore, the system can quickly respond to the instructions of the upper computer, and accurate time control can be realized.

The invention discloses a dynamic master clock selection method based on Kalman filtering and Bayesian estimation, which is applied to the technical field of master clock selection, and comprises the following steps: constructing a virtual clock by calculating observation equations of a plurality of atomic clocks; performing state estimation on the atomic clocks by using a Kalman filtering method to obtain state estimation values of the atomic clocks; the state estimation value of each atomic clock comprises the phase and frequency estimation value of the atomic clock; the phase of each atomic clock is the phase deviation of the atomic clock relative to the virtual clock, and the frequency estimation value is the frequency estimation value of the atomic clock relative to the virtual clock; calculating the short-term frequency stability and the long-term frequency drift rate of the atomic clock based on the state estimation value of each atomic clock, and defining the comprehensive performance index of the atomic clock based on the short-term frequency stability and the long-term frequency drift rate; and calculating the posterior probability of each atomic clock based on the comprehensive performance index of each atomic clock and the current observation data by using a Bayesian estimation method so as to perform high-flexibility and high-reliability main clock selection.