120 results about "Atomic clock" patented technology

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 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 discloses a high-precision time synchronization method and system based on distributed airborne measurement, and the method comprises the following steps: employing a high-precision atomic clock as a system clock, transmitting the precise clock to slave devices at all levels, achieving the homology and the same frequency of the clock, and guaranteeing the time consistency of the timekeeping process of a local clock; clock and time service data are transmitted through high-speed optical fibers, independent optical fiber communication links are distributed, and the same clock and time service data receiving and transmitting module is used, so that the data transmission and receiving processing time of all levels of equipment in the time service process is fixed, and the fixed time delay can be measured through a specific means. And high-precision time synchronization is finally realized by compensating the fixed time delay. Based on the distributed design of airborne measurement, the index requirements of small design size and high synchronization precision of the master device and the slave device are met, the synchronization precision can reach 10ns, the slave device can be flexibly expanded, and the method is suitable for various distributed measurement systems or measurement and control systems with high requirements on time synchronization precision.

The invention relates to a Beidou pseudolite signal simulation generation method, which comprises the following steps of: setting a pseudolite private frequency band so as to avoid same-frequency interference with a real Beidou satellite signal; high-precision clock synchronization is carried out to ensure that the pseudolite and the Beidou atomic clock are highly synchronized; and the transmitting power is dynamically adjusted to adjust the transmitting power in real time, the near-far effect is inhibited, and the signal coverage range is optimized. Through collaborative optimization of frequency spectrum planning, clock synchronization and power regulation, the positioning availability is improved and the elevation precision is optimized in a complex environment, and a complete enhanced positioning solution is provided for a Beidou system in scenes such as automatic driving, tunnel navigation, mountains and canyons.

This invention discloses a rubidium atomic clock frequency adaptive prediction method and system based on LSTM network, belonging to the field of time and frequency technology. The invention includes the following steps: Step 1. Data acquisition; Step 2. Filtering and denoising preprocessing; Step 3. Normalization processing; Step 4. LSTM model training and deployment; Step 5. Frequency prediction; Step 6. Online model adaptation. This invention employs a Long Short-Term Memory (LSTM) network, a special type of recurrent neural network, which can effectively learn the complex time dependencies and noise patterns in rubidium atomic clock time and frequency data. The inherent gating mechanism of the LSTM model makes it adept at capturing long-term dependencies in time series, thus enabling high-precision prediction of short-term frequency fluctuations. Through an online fine-tuning mechanism, this invention allows the LSTM model to continuously adapt to the individual drift and aging characteristics of a single rubidium atomic clock, achieving precise optimization for each clock and model, significantly improving the practicality and long-term stability of the method.

This invention relates to a multi-mode communication release-response integrated time-synchronized underwater mooring system and method, and relates to the fields of underwater acoustic communication networks and underwater positioning and navigation technology. The purpose of this invention is to solve the problems of poor reusability of existing underwater mooring systems in complex and diverse application scenarios, the insynchrony of time among mooring nodes making it impossible to coordinate data aggregation or communication reporting tasks at precise times, resulting in single-function underwater mooring equipment, low resource utilization, and large reference time errors. The system includes multiple dual-master control mooring communication units and an external battery compartment, integrating spread spectrum communication, OFDM communication, multiple orthogonal response, atomic clock timekeeping, release control, and positioning functions; it achieves time synchronization and local timekeeping through 1PPS signals and GPRMC information or absolute time information; after deployment, each node completes multi-mode signal reception and response according to a preset mode, and serves as a positioning anchor point to achieve platform positioning through a long baseline positioning algorithm; after the task is completed, it is released and surfaced under control.

The invention provides a temperature self-adaptive frequency locking system and method applied to a CPT atomic clock, the system comprises a TEC heating sheet 1, a VCSEL laser 2, a temperature sensor 3, a gas chamber shell 4, a gas chamber 5 and the like, the VCSEL laser 2 is tightly attached to the surface of the TEC heating sheet 1, the temperature sensor 4 is arranged near the outer side of the gas chamber 5, the gas chamber 5 is wrapped by the gas chamber shell 4, and the TEC heating sheet 1 is arranged in the gas chamber shell 4. A heating resistor network 7 is arranged at the lower part of the air chamber 5; a laser beam emitted by the VCSEL laser 2 passes through the gas chamber 5 and then is received by the photoelectric sensor 6. The whole control is executed by a CPT atomic clock control system 9; and feedback signals of the temperature sensor 4 are respectively transmitted to the frequency drift algorithm processing module 10 and the control parameter adjustment algorithm processing module 11. Output signals of the two modules are transmitted to a CPT atomic clock control system 9; a feedback signal of the photoelectric sensor 6 is also transmitted to the CPT atomic clock control system 9; the VCO voltage-controlled crystal oscillator 8 is controlled by the CPT atomic clock control system 9 and outputs frequency to the outside.

The invention discloses a multi-source heterogeneous clock group management system and method based on an ALGOS time scale algorithm. The method comprises the steps that an atomic clock group outputs multiple paths of radio frequency analog signals; the signal frequency discrimination comparison module is used for converting the radio frequency analog signal into a digital signal, measuring the frequency and calculating frequency difference data; the atomic time scale calculation module converts the frequency difference data into frequency difference data relative to the atomic time scale, predicts the clock face frequency reading, determines the weight of each atomic clock according to the forecast residual error, and calculates the atomic time correction through weighted average; the frequency scale control module calculates the frequency offset according to the atomic time correction, the crystal oscillator and the atomic clock signal, and generates control voltage; and the local voltage-controlled crystal oscillator receives the control voltage and reproduces a high-precision time-frequency reference signal synchronized with the atomic clock group. According to the invention, the operation state of the atomic clock is not adjusted, only discrete sampling is carried out, the advantages of the clock group are fused by utilizing the ALGOS algorithm, the long-term stability of the output signal is improved by controlling the high-reliability voltage-controlled crystal oscillator, and the influence of frequency drift, intermittent start and stop and noise interference is effectively inhibited.

The invention provides an atomic clock error simulation method and device, equipment and a storage medium. Relates to the technical field of high-stability time keeping. The method comprises the following steps: decomposing the clock difference of an atomic clock into a deterministic trend term and a random noise term, and obtaining a deterministic trend term simulation value through polynomial fitting; performing identification and intensity decomposition on the random noise item according to the clock difference frequency stability; simulating the random running frequency modulation noise, the random walking frequency modulation noise, the white frequency modulation noise and the white phase modulation noise according to a set simulation formula to obtain corresponding power law noise simulation values; for the flicker walk frequency modulation noise, the flicker frequency modulation noise and the flicker phase modulation noise, fitting by using a first-order Markov process according to the power spectrum density characteristic to obtain a corresponding power law noise simulation value; and adding the deterministic trend term simulation value and various power law noise simulation values to obtain a simulation clock difference value of the corresponding stability. According to the method, atomic clock error simulation which is clear in physical significance, low in calculation cost and high in interpretability can be realized.

The invention discloses a cloud computing analysis method based on a time mark pulse sequence, and belongs to the technical field of signal processing. The method is used for solving the technical problems that in an existing scheme, delay nonlinearity caused by multipath propagation is not considered, and effective decoupling cannot be achieved due to a coupling effect existing in atomic clock error estimation and system deviation. A direct component and a scattering component can be distinguished through time scale layered mapping, and the amplitude-phase-frequency coupling effect of multi-path propagation is covered by fusing the three-dimensional characteristics of delay inequality, amplitude attenuation and frequency drift; the nonlinear mapping capability of the hyperbolic tangent kernel function is superior to that of a linear model, and the hyperbolic tangent kernel function can adapt to time delay nonlinear change in a complex electromagnetic environment; clock error, time delay parameters and system deviation are modeled in a unified mode, error accumulation caused by traditional separation estimation is avoided, variable dependency is quantized through an information theory tool, mutual information decoupling is achieved, robustness is enhanced, and a decoupling result directly corresponds to an atomic clock core index and system interference.

This invention discloses a method, system, device, and medium for evaluating the performance of a high-precision space atomic clock. The method includes the following steps: calculating the relative clock difference between space and ground based on a two-way time difference measurement method; wherein, a distance inconsistency delay error is introduced for correction during the calculation of the relative clock difference; calculating stability, sky stability, and space-to-ground alignment accuracy based on the calculated relative clock difference; and achieving performance evaluation of the high-precision space atomic clock based on the stability, sky stability, and space-to-ground alignment accuracy. In the technical solution provided by this invention, a space-to-ground time alignment network system based on a microwave ranging link is used, and the relative clock difference information between space and ground is calculated based on a two-way time difference measurement method. Finally, the performance of the high-precision space atomic clock can be evaluated using the relative clock difference information.

Optical frequency reference apparatus (10) comprising - an atomic vapor cell (1), containing a vapor of reference atoms, said atomic vapor cell (1) comprising a first end (41) having a first window (4) and a second end (61), - a laser source (11) for generating a laser probe beam (3) adapted to excite a two-photon optical transition of said reference atoms, - an optical detector (14), adapted to detect a fluorescence signal emitted by said reference atoms, and - at least one reflective element (5, 15) wherein the laser source (11), the atomic vapor cell (1) and the at least one reflective element (5, 15) are configured such that, in operation, the probe beam (3) enters the atomic vapor cell (1) through said first window (4) at said first end (41) and crosses said vapor of reference atoms until said second end (61) through a defined optical path in a first forward direction (3a), the probe beam (3) is reflected backwards by said at least one reflective element (5, 15) and crosses said vapor of reference atoms a second time through the same defined optical path, in a second direction (3b) opposite to the first forward direction (3a), characterized in that the optical frequency reference apparatus (10) further comprises means (7, 9) for absorbing the reflected laser probe beam (3) exiting from the atomic vapor cell (1) according to the second direction (3b).

A method for synchronous excitation of multiple exciters relates to the field of dynamic testing and vibration control technology for large civil structures. The method includes the following steps: after constructing a unified time reference based on satellite navigation signals and a rubidium atomic clock, excitation amplitude and phase parameters are obtained based on the target modal requirements, and these parameters are sent to all exciter slave stations; the exciter slave stations generate a reference trajectory based on the excitation amplitude and phase parameters, enabling the exciter motor shaft angle to follow the reference trajectory in real time and output the target excitation; the phase error is obtained based on the measured excitation phase value and the reference trajectory, and then the motor angular velocity of the exciter is corrected based on the phase error. This invention solves the problems of startup phase error and long-term frequency drift in master-slave triggering schemes, ensuring synchronous start-up of all exciters. Combined with dynamic correction of the exciter motor angular velocity, it suppresses phase drift during long-term operation, significantly improving the excitation efficiency of higher-order modes and the clarity of the response signal.

This invention relates to a dual-chip hot standby control system and method for a spaceborne rubidium atomic clock, belonging to the technical field of spacecraft time and frequency control systems. The system includes a master control ARM chip, a backup control ARM chip, servo circuits, a status monitoring module, and a high-speed synchronization bus. By constructing a dual-chip redundant control architecture, it achieves real-time synchronization of servo parameters and master / backup switching control. The backup control ARM chip has a built-in phase-locked loop pre-synchronization module, possessing frequency tracking and phase error compensation capabilities. When the master control ARM chip malfunctions, it can take over servo control within 10μs, ensuring the continuity and stability of frequency output. Simultaneously, the system introduces multi-dimensional fault criteria, mutually exclusive output paths, and low-pass filtering circuits to enhance anti-interference capabilities. This invention effectively improves the on-orbit reliability of the rubidium atomic clock servo system and is suitable for low-Earth orbit satellite missions with extremely high requirements for continuity and precision.

The invention relates to the technical field of optical atomic clocks, and discloses a multi-mode magnetic field generation and regulation device and method for a strontium atom optical clock, and the device comprises a three-dimensional magnetic field coil, a magnetic field control system, and a magneto-optical trap. The three-dimensional magnetic field coil comprises an X-direction magnetic field coil, a Y-direction magnetic field coil and a Z-direction magnetic field coil; the X-direction magnetic field coil, the Y-direction magnetic field coil and the Z-direction magnetic field coil are mutually orthogonal and are respectively arranged along opposite positions to form a cubic framework, and the magneto-optical trap is positioned in the cubic framework; the magnetic field control system is electrically connected with the X-direction magnetic field coil, the Y-direction magnetic field coil and the Z-direction magnetic field coil. The technical problems that an existing strontium atom optical clock system is complex in structure and high in power consumption and thermal load, and time sequence characteristics used by a magnetic field in the operation process of the optical clock are not fully utilized are solved.

The invention belongs to the technical field of glass processing, relates to processing of an atomic clock microwave cavity, and relates to a tool and a method for high-precision processing of a large-size thin-wall glass cavity. The two ends of the glass crystal ingot are cut to be flat, and the parallelism of the two end faces after cutting is smaller than or equal to 0.05 mm; a first blank of a barrel-shaped structure is manufactured in the flatly-cut end face through drilling; milling and grinding the first blank to obtain a second blank; and the second blank is polished through the tool, and then the workpiece is obtained. The tool comprises a polishing main shaft, a top roller and a driving mechanism. According to the method provided by the invention, high-precision, high-efficiency and high-reliability processing can be carried out on the large-size thin-wall glass microwave cavity, so that the processing quality of the cavity and the performance of an atomic clock are improved, and the method plays an important role in the aspects of a satellite navigation system, deep space exploration and spacecraft orbit determination, information network synchronization, a national time frequency system and the like.

The application provides a kind of laser pumped cesium atomic beam clock parameter adaptive setting device and method, relating to atomic clock technical field, including cesium beam tube unit;Cesium beam tube drive unit;Frequency stabilization laser light source unit;Acoustooptic frequency shift unit;Crystal oscillator lock frequency unit;Temperature acquisition and control unit;Wherein, main control unit is connected each controlled module by communication interface, and in-machine computer runs host computer software: calculate relative frequency deviation and allan variance, obtain frequency deviation sequence and allan variance data set;Determine the optimal working parameter combination corresponding to peak value;Linkage executes primary temperature control, secondary temperature control and tertiary temperature control, realizes temperature gradient compression and wavelength stability control;Compare real-time monitoring parameters with preset threshold, determine alarm level, thereby trigger system response instruction.The beneficial effects of the application are to reduce labor cost, improve temperature adaptability and improve long-term stability index.

The invention discloses a safe and credible encrypted offline time synchronization method and system, and relates to the technical field of time synchronization, and the method comprises the steps: a standard time calibrator obtains national standard time through a compliance time service mode capable of tracing to coordinate world time, transmits the national standard time to a portable time service clock, and calibrates a built-in atomic clock of the portable time service clock; after the portable time service clock autonomously keeps time, the portable time service clock is physically transferred to a target network deployment area, and one-way connection with the safety time service server is established through a special interface; the security time service server receives the time signal in a one-way isolation mode and executes security authentication, and after the authentication is passed, a built-in atomic clock is synchronized; and the safety time service server generates a standard time service signal, and provides a time synchronization service for the terminal equipment in the target network through a preset time service protocol, so that the physical isolation safety of the target network is ensured, and the compliance traceability and high-precision synchronization of a time source are realized.

This invention provides a technology that allows for the appropriate adjustment of the oscillation frequency of laser light emitted from a laser device. [Solution] The laser device 10 includes an optical system that includes a laser diode 30 that emits laser light and an external resonator 50 provided outside the laser diode 30 and causing the laser light emitted from the laser diode 30 to resonate. The oscillation frequency of the laser light from the laser device 10 changes based on the current flowing through the laser diode 30 and the optical system that includes the laser diode 30 and the external resonator 50. An initial value for the parameter combination is set based on first data showing the change in oscillation frequency with respect to a parameter combination of a first parameter that adjusts the current and a second parameter that adjusts the optical system, and a predetermined target frequency.

A kind of composite clock establishment method based on atomic clock and millisecond pulsar, reads millisecond pulsar timing observation data, calculates the timing residual of millisecond pulsar;The timing residual of millisecond pulsar is sorted according to the order of reduced julian day;Millisecond pulsar that meets the establishment of millisecond pulsar time is screened out;Whether the timing residual of screened millisecond pulsar is multi-band timing residual is judged;Multi-band timing residual is statistically processed to obtain average timing residual;Average timing residual and timing red noise identification and processing of timing residual that is not multi-band are carried out, to obtain millisecond pulsar time time sequence;Read atomic clock measurement comparison data, carry out frequency and phase jump identification and rough error detection preprocessing, to obtain atomic time time sequence;Millisecond pulsar time and atomic clock time are combined using Vondrak-Cepek combination method to obtain composite clock Q.The composite clock established by the present application has both millisecond pulsar time long-term stability and accuracy, and also has atomic clock time high resolution and medium and short-term stability.

The present invention provides an optical atomic clock system comprising: an optical pulse generation component adapted to generate a clock interrogation optical pulse; the atomic furnace is used for generating atomic steam; each subsystem is suitable for capturing and preliminarily cooling atoms in the received atom steam to obtain a cold atomic group, and is used for trapping the atoms in the cold atomic group; the subsystem is constructed to allow clock polling pulse light to enter, so that atoms in a ground state interfere with each other under the action of two clock polling light pulses; the processing component is used for obtaining an error signal of the subsystem according to the interference result in any subsystem; a timing controller configured to: cause atoms within the at least one subsystem to be in an illumination phase of the clock interrogation light pulse or in a free evolutionary phase between two illumination of the clock interrogation light pulse; the frequency of the clock interrogation light pulse is corrected according to the respective error signals of the plurality of subsystems.

The utility model relates to the technical field of power grid equipment, in particular to a power grid clock synchronizer which comprises a main body, a main clock module is arranged on the side face of the main body, a slave clock module is fixedly connected to the side face of the main clock module, and a communication module and a synchronous control and power module assembly are fixedly connected into the main body. According to the utility model, the master clock module adopts a high-precision atomic clock as a clock source, calibration is carried out through the satellite signal receiving module, high precision and stability of the master clock are ensured, and the slave clock module carries out adjustment according to a clock signal of the master clock module to realize high-precision clock synchronization of a whole power grid system. The communication module adopts various communication modes, including optical fiber communication, wireless communication and power line carrier communication, so as to adapt to different power grid environments and equipment distribution conditions.

This invention relates to the field of marine environmental monitoring technology. Specifically, it relates to a high-power marine acoustic tomography system for marine environmental monitoring. The system includes a regional deployment and clock synchronization module, a signal generation and high-power transmission module, a signal reception and propagation time measurement module, a sound velocity calculation and reference area selection module, a sound velocity parameter weighted correction module, and an environmental parameter inversion and result fusion module. By constructing a standardized end-to-end technical solution from regional deployment, signal transmission and reception, parameter calculation to environmental inversion, it achieves large-area, high-precision, and continuous environmental monitoring of target marine areas. Through standardized gridded regional division, GPS carrier phase positioning node calibration, and high-precision clock synchronization using GPS-acquired atomic clocks, a standardized underwater mooring node network is established, ensuring the basic accuracy of underwater acoustic signal propagation time measurement and sound velocity parameter calculation from a hardware deployment perspective.

The application relates to an atomic clock complete machine high-precision temperature control device and a control method.The atomic clock complete machine high-precision temperature control device comprises a machine box used for placing an atomic clock, and is characterized in that further comprises a plurality of TEC modules arranged in the machine box, a plurality of temperature sensors same in number as the TEC modules, each temperature sensor is used for detecting the temperature of the area below the corresponding TEC module, and a controller connected with all the temperature sensors, wherein the controller is used for adjusting the output power of the corresponding TEC module according to the detection result of each temperature sensor.The advantages are that the temperature gradient can be eliminated by the partition control mode, the overall temperature uniformity is improved, and then the precision requirement of the atomic clock is met; in addition, the device does not need a compressor to realize the adjustment of the temperature, and then the frequency stability of the atomic clock is not affected.

The invention discloses a chip atomic clock temperature control system and an implementation method. Precise temperature regulation and control are realized by adopting a three-stage layered temperature control framework. The system comprises a laser (integrated with a first temperature control unit) provided with a closed protective cover, an air chamber (integrated with a second temperature control unit) fixed on a circuit board, and a third temperature control unit integrated with the protective cover. The first temperature control unit realizes automatic locking of laser wavelength through PID control, atomic absorption peak search and phase sensitive detection; the second temperature control unit adopts a semiconductor thermoelectric refrigerating unit and a thermistor to control the temperature (+ / -0.1 DEG C) of the air chamber in a closed-loop manner; the third temperature control unit and the first unit cooperate to form layered regulation and control, and the protective cover is of a heat radiation reflecting layer / vacuum heat insulation layer / heat conduction buffer layer composite structure. The method comprises the steps of laser layered temperature control, gas chamber constant temperature maintenance, automatic wavelength locking and protective cover composite temperature control. The laser temperature control precision of + / -0.01 DEG C is realized through multi-stage cooperative control, and the time-frequency stability of the atomic clock is remarkably improved.

This application relates to a method for determining gravity potential and altitude using GNSS carrier phase inter-station single-difference time-frequency transfer. The method includes: using a high-performance atomic clock as the reference clock for the GNSS receiver, providing the GNSS receiver with a high-precision and high-stability time and frequency reference; conducting high-precision GNSS observations; directly calculating the clock difference between two GNSS stations using GNSS inter-station single-difference carrier phase time-frequency transfer technology; extracting gravity frequency shift information between the two stations; and then determining the gravity potential difference between the two stations based on the gravity frequency shift formula to achieve cross-sea altitude measurement. This solves the problems of existing technologies, such as the difficulty in eliminating the influence of satellite-end errors on GNSS time-frequency transfer, the inability to overcome the limitations of traditional gravity potential measurement technologies, and the difficulty in achieving a unified global altitude benchmark.

The invention provides a magnetic field detection system and method based on an atomic clock. The system comprises a source clock, a probe clock, a graphical display interface and a communication port, wherein the source clock is used as a reference benchmark and is used for providing a calibration signal for the probe clock through the communication port so as to finish initial calibration of the probe clock; the probe clock is used as a magnetic sensitive unit, is arranged in a magnetic field environment to be measured, and is used for sensing the change of an external magnetic field based on the magnetic sensitive frequency shift characteristic of the atomic clock after initial calibration is completed, and outputting the sensed change as a time difference signal through a communication port; the graphical display interface is used for receiving and processing the time difference signal, generating and displaying a time difference change curve, and performing characteristic analysis on the time difference change curve to obtain a detection result of magnetic field disturbance; and the communication port is respectively connected with the source clock, the probe clock and the graphical display interface and is used for providing bidirectional data interaction among the source clock, the probe clock and the graphical display interface.

The application discloses a kind of light microwave source system and method, the system includes light signal generation module, for generating CPT phenomenon, output optical filtered laser beam;Photodetector, for converting optical signal into electrical signal;Electric signal adjustment module, for amplifying the electrical signal output by photodetector, and carry out beam splitting;Crystal oscillator locking module, including crystal oscillator, for the second road signal after beam splitting is modulated and input to frequency divider, with the signal output by crystal oscillator after frequency division is phase detected and forms error check signal, crystal oscillator locking module generates the microwave signal of the microwave source system;PID control module, for processing error check signal, forms voltage control signal to control voltage control phase shifter.The application has the stability of CPT atomic clock and the advantage of low phase noise of photoelectric oscillator, improves the stability of microwave signal, can provide high-stability and low-phase-noise microwave and time frequency signal.

The application discloses a kind of based on random sampling consistency and change point detection atomic clock integrity monitoring method, comprising: for the frequency difference data of atomic clock in current sliding window, using random sampling consistency algorithm to construct temporary trend model, based on the inner point residual statistics of this model corresponding to set dynamic threshold to judge all data points in current sliding window, determine abnormal point;And the data value of abnormal point is replaced with the predicted value fitted by temporary trend model;Until all sliding windows are traversed, complete data repair and output all abnormal point positions;The frequency difference data of atomic clock is median filtered, and the noise median absolute deviation estimate value is calculated;Based on the value and the total number of data points in current sliding window, a penalty item benchmark is constructed to generate a penalty value sequence;Then the PELT algorithm is used to select the selected change point number to determine the change point position, so that a kind of high-precision atomic clock integrity monitoring method is realized.

The application discloses an outer vacuum obtaining and magnetic shielding device for ground testing of a hydrogen atomic clock, comprising an outer vacuum preparation mechanism, wherein the outer vacuum preparation mechanism comprises a two-stage vacuum pump set, the two-stage vacuum pump set comprises a rotary vane molecular pump and a diaphragm oil-free mechanical pump, the two-stage vacuum pump set further comprises a vacuum gauge, a magnetic shielding cover, a pipeline, a vacuum valve one, a vacuum valve two and a magnetometer; the molecular pump and the mechanical pump are connected in series, and the mechanical pump serves as a front-stage pump. The application integrates zero magnetic treatment and environment control functions on the basis of a traditional vacuum pump set, is suitable for spacecraft assembly testing environment, meets severe testing conditions of the hydrogen atomic clock, is convenient to maintain, is suitable for transportation, can realize real-time measurement and control of vacuum degree and magnetic intensity, can realize rapid pressure relief testing of the hydrogen atomic clock in the device, verifies performance indexes of the hydrogen atomic clock under extreme environment, and is a necessary device for ground testing of next-generation spaceborne precise time and frequency instruments.