1708 results about "Crystal oscillator" patented technology

The invention relates to the technical field of robot control, and discloses a heterogeneous robot control system with intelligent and multi-modal perceptual driving, comprising: a quantum clock reference module used for generating a globally synchronized picosecond-level time reference signal and synchronizing a multi-modal sensor clock through a microwave pulse; the multi-mode sensing module comprises an event camera of which the dynamic range is greater than or equal to 120dB, a six-dimensional force sensor of which the noise density is less than or equal to 0.01 N / Hz and an inertial measurement unit of which the zero-bias stability is less than or equal to 0.8 degree / h; and the random differential manifold module adopts a four-layer full-connection neural network, and an input layer receives multi-modal data. According to the invention, a diamond NV color center system of the quantum clock reference module and a microwave pulse coupling technical scheme are adopted, so that a picosecond-level global signal synchronization effect is achieved. Compared with a scheme depending on a traditional crystal oscillator or a GPS clock in the prior art, the defects that electromagnetic interference is prone to occurring and signal jitter is large are overcome, and high-precision time sequence alignment of multi-module cooperation is ensured.

The invention relates to a time synchronization maintaining method assisted by temperature sensing, and belongs to the technical field of time synchronization. The method comprises the following steps: for a network communication scene in which synchronous information interaction cannot be carried out between equipment due to a main clock fault or communication link interruption, considering the characteristic that the output frequency of an equipment clock crystal oscillator presents nonlinear dynamic time varying due to environment temperature change; constructing a time sequence prediction model based on the TimeNet neural network and suitable for the non-external connection; training the model by using clock parameter data and temperature information which are historically recorded; using the trained model to take the environment temperature information as the input of the model, and predicting the clock frequency offset of the slave node; and the clock phase offset of the slave node is calculated by using the predicted clock frequency offset and a frequency offset autoregressive state transition equation, and the slave node corrects a local clock and realizes clock self-holding with the master node by using the clock frequency offset and a clock phase offset value.

The invention discloses an anti-fouling piezoelectric ceramic membrane which comprises a support body, a coil and a piezoelectric ceramic separation layer, the support body is made of porous ceramic with a through hole in the middle; the coil is a closed loop composed of a lead coil and a crystal oscillator; the piezoelectric separation layer is coated on the inner wall of the through hole of the support body; and the coil is arranged between the support body and the piezoelectric ceramic separation layer. When a medium containing electrolyte passes through a membrane hole, the coil generates induction direct current, the direct current is converted into positive wave pulse current through the oscillator, the wound and overlapped piezoelectric ceramic membrane separation layer is excited, ultrasonic vibration is generated, and therefore the membrane dirt blocking condition is reduced, the use efficiency of the ceramic membrane is improved, and the maintenance and use cost is reduced.

The invention discloses a corrosion monitoring and evaluating method and device for a storage environment. The method comprises the following steps: acquiring a corrosion monitoring information set of the storage environment; the corrosion monitoring information set comprises a resistance ratio sequence, a corroded quantity sequence, a quartz crystal oscillation frequency value sequence, an electrochemical impedance module value sequence, a wettability sequence and a corrosion rate value sequence; performing data preprocessing on the corrosion monitoring information set to obtain a preprocessed corrosion monitoring information set; and performing corrosion monitoring evaluation processing on the preprocessed corrosion monitoring information set to obtain corrosion monitoring evaluation result information.

The invention relates to a self-diagnosis method for a state terminal of a substation measurement system, which comprises the following steps of: comparing signal values at different sampling nodes of signals from the same physical source in each measurement channel through the state terminal, and judging that the channels have physical chain degradation or poor contact; performing perturbation modulation on a measurement sampling process based on a clock signal controlled by a crystal oscillator in the state terminal, and if response deviation abnormity is detected, judging that a sampling time base has drift, time sequence disorder or cache backlog so as to identify a time base health state of a sampling chain in the terminal; in the operation process of the transformer substation, response differences generated by the excitation in different measurement channels are collected, and if response delay, amplitude distortion or jitter starting point deviation is found, it is judged that the anti-interference capacity of the corresponding channel is degraded; and according to the electric energy change rhythm sensed by the terminal in real time, adaptively adjusting the sensitivity threshold value of the jump response, and if frequent misjudgment or slow response of the jump response is detected, marking that the behavior sensitivity of the terminal sampling system is abnormal.

The invention provides a novel clock control method and system based on FPGA, and relates to the technical field of signal processing. The system provided by the invention comprises: a VCXO voltage-controlled crystal oscillator, a digital-to-analog converter, a PLL phase-locked loop module, a DDMTD measurement module and an adaptive clock control module. The phase-locked loop is implemented, a phase detection algorithm and a clock control algorithm are executed based on a single FPGA chip, and the hardware design complexity is low. The invention uses a digital dual-mixing time difference method (DDMTD) to measure and obtain a clock phase detection result, and cooperates with a dynamic PID clock control algorithm to quickly adjust the local clock frequency, so as to realize the fast tracking and locking of the frequency and phase between the local clock and the clock source. The dynamic PID clock control algorithm of the invention dynamically adjusts the parameter P of the PID algorithm in real time according to the state, the clock frequency deviation and the clock phase difference, so that the algorithm has the advantages of stronger locking ability, shorter convergence time and faster response.

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 belongs to the technical field of clock synchronization, and discloses a synchronous clock precision optimization method and device and electronic equipment, and the method comprises the steps: obtaining a first crystal oscillator frequency and environment parameters of a clock source; inputting the environmental parameters into a preset deviation prediction model to obtain a first deviation value output by the deviation prediction model; and performing compensation calibration on the first crystal oscillator frequency according to the first deviation value, and tracking time according to a compensation calibration result. By monitoring and compensating the influence of environmental parameters on the frequency of the crystal oscillator in real time, the precision and stability of the clock are remarkably improved. The dynamic compensation mechanism can adapt to environmental changes, the influence of external factors on clock precision is reduced, meanwhile, the dependence on expensive hardware is reduced, and the development and maintenance cost of the whole system is reduced. In addition, the method is realized through software design, can be easily integrated into an existing clock synchronization system, is simple in maintenance and updating process, and does not need complex hardware replacement or adjustment.

The invention discloses a temperature drift compensation method for a miniature crystal oscillator chip, and particularly relates to the field of temperature drift compensation for electromagnetic interference signal measurement, which comprises the following steps of: arranging a double-shaft Hall sensor array around a temperature sampling channel of the miniature crystal oscillator chip, and carrying out spatial distribution acquisition on a low-frequency electromagnetic field in a chip operation environment; generating an electromagnetic disturbance signal for representing a parasitic electromagnetic interference behavior; and pilot frequency convolution processing is carried out on the electromagnetic disturbance signal and a thermal response signal obtained in a temperature sampling channel, coupling response characteristics related to an electromagnetic interference behavior are extracted, and a spectrum fitting template of an electromagnetic parasitic injection behavior is constructed. A low-frequency electromagnetic disturbance sensing channel is synchronously introduced outside a temperature sampling path, and an interference identification, stripping and compensation dynamic linkage mechanism is constructed to realize active detection and correction of latent electromagnetic interference components in a temperature response signal, so that the problems of frequency compensation error and long-term offset accumulation in the prior art are solved.

The invention discloses a frequency offset compensation method and electronic equipment, relates to the field of communication, and is used for respectively compensating crystal oscillator frequency offset and Doppler frequency offset when the electronic equipment performs satellite communication. The frequency offset compensation method comprises the following steps: obtaining a direction vector of an electronic device pointing to a satellite in an electronic device coordinate system according to a phase difference of downlink signals from the satellite received by a plurality of antennas; obtaining a direction vector of the electronic equipment pointing to the satellite in the earth coordinate system according to the direction vector of the electronic equipment pointing to the satellite in the electronic equipment coordinate system and the attitude information of the electronic equipment; obtaining the coordinates of the satellite in the earth coordinate system according to the direction vector of the electronic equipment pointing to the satellite in the earth coordinate system; according to the carrier frequency of the downlink signal emitted by the satellite and the coordinates of the satellite in the earth coordinate system at multiple moments, Doppler frequency offset and crystal oscillator frequency offset of the downlink signal are obtained; and compensating the carrier frequency of the uplink signal sent by the electronic equipment.

The embodiment of the invention provides a high-stability crystal oscillator taming device, system and method, and solves the problems that in the prior art, the precision is insufficient, the stability is insufficient, and the time cannot be kept at high precision by depending on a GPS (Global Positioning System) or under a specific condition. The high-stability crystal oscillator taming equipment comprises a judgment module which is used for receiving the time signal of the satellite and carrying out validity judgment; and the phase detection module is used for receiving a second signal sent by the high-stability crystal oscillator to be detected and performing phase difference detection on the second signal and a time signal of a satellite to obtain a comparison signal. And the aging module and the temperature module respectively carry out aging compensation and temperature compensation on the comparison signal and then send the comparison signal to the adjusting module. And the adjusting module is used for converting the comparison signal into an adjusting signal and sending the adjusting signal to the to-be-tested high-stability crystal oscillator, and is used for adjusting the output frequency of the high-stability crystal oscillator. The frequency accuracy and the long-term frequency stability of the high-stability crystal oscillator are effectively improved by combining Kalman filtering, aging compensation, temperature compensation, PID (Proportion Integration Differentiation) adjustment and other technologies.

In some examples, a method includes receiving, at a first device, a radar signal transmitted by a second device at a transmission frequency offset from a local oscillator (LO) frequency of the first device by a target offset and reflected off a target. The method also includes determining an intermediate frequency (IF) of the radar signal based on the transmission frequency and the LO frequency. The method also includes determining a parts per million (ppm) offset between the first device and the second device based on the intermediate frequency and the target offset.

The invention provides a dynamic high-precision PTP (Precision Time Protocol) time synchronization system realized based on an FPGA (Field Programmable Gate Array), which comprises a master device and a slave device, and the master device and the slave device are connected through a PHY (Physical Layer) to carry out PTP time synchronization; the master device and the slave device have the same structure and comprise an FPGA and a voltage-controlled crystal oscillator; in the master device, the FPGA obtains the frequency difference and the phase difference between the master device and an externally input reference source, further adjusts the frequency of a voltage-controlled crystal oscillator, corrects a local time mark, and sends a PTP message to the slave device; and in the slave equipment, the FPGA obtains the frequency difference and the phase difference between the slave equipment and the master equipment based on the received PTP message, so that the frequency of the voltage-controlled crystal oscillator is adjusted, and the local time scale is corrected. According to the invention, low-cost and high-precision PTP time synchronization is realized.

The invention relates to the technical field of integrated circuit design, and discloses a crystal oscillation circuit and a crystal oscillator, and the crystal oscillation circuit comprises a core oscillation circuit which is configured to output oscillation voltage; the voltage amplitude detection circuit is connected with the core oscillation circuit and is configured to detect the amplitude of the oscillation voltage and output direct current voltage according to the amplitude of the oscillation voltage; the first bias circuit is respectively connected with the voltage amplitude detection circuit and the core oscillation circuit and is configured to output a first bias current according to the direct current voltage; the second bias circuit is connected with the core oscillation circuit and is configured to output a second bias current according to the temperature change; wherein the first bias current and the second bias current act on the core oscillation circuit and provide bias current for the core oscillation circuit. According to the crystal oscillation circuit, the circuit power consumption after crystal oscillation starting can be reduced under the condition of realizing rapid crystal oscillation starting.

The utility model belongs to the technical field of vacuum evaporators, and discloses a crystal oscillator probe structure which comprises a crystal oscillator water pipe, a probe assembly is arranged at the bottom of the crystal oscillator water pipe, an installation structure is arranged on the inner wall of the probe assembly, and a driving assembly located outside the probe assembly is arranged at the top of the installation structure. A clamping structure is arranged in the probe assembly, the probe assembly comprises a mounting frame, and a detection head is movably sleeved with the mounting frame. According to the utility model, the detection head and the connecting plate are arranged, the reverse rotating block is rotated, and the whole detection head is limited through the clamping block, so that the screw rod is screwed out of the detection head, and the connecting plate, the protection plate, the limiting frame and the supporting frame are driven to move upwards and a wafer in the limiting frame is driven to move out of the mounting frame through the elastic force of the spring I; therefore, the wafer can be conveniently replaced by an operator, and the replacement efficiency of the wafer is improved.

The embodiment of the invention discloses a crystal oscillator testing method and system and a computer readable storage medium, which can cope with testing of various types of crystal oscillators and are high in compatibility, simple in system architecture and low in implementation difficulty. The crystal oscillator test system comprises a control device, a first electric control switch, an oscillator chip and a crystal resonator. The control equipment is connected with the first end of the first electric control switch and is also connected with the oscillator chip; the oscillator chip is connected with the second end of the first electric control switch; the crystal resonator is connected with the third end of the first electric control switch; when the first electric control switch is disconnected, the first end and the second end are conducted, and the second end and the third end are disconnected; when the first electric control switch is closed, the first end and the second end are disconnected, and the second end and the third end are conducted; the control device can control the pins corresponding to the test items in the oscillator chip by controlling the first electric control switch to be switched on according to each test item, so as to obtain test data corresponding to the test items.

The invention provides a crystal oscillator monitoring method and system based on a multi-sensor network. The method comprises the following steps: acquiring operation environment data of the quartz crystal oscillator, monitoring an output signal of the quartz crystal oscillator, and acquiring output frequency and time for measuring the crystal oscillator in each batch; calculating the daily frequency change rate of the quartz crystal oscillator, and establishing an aging linear regression equation of the quartz crystal oscillator through a least square method based on the operation environment data, the output frequency, the daily frequency change rate and the time; and predicting an output frequency prediction value of the quartz crystal oscillator based on the aging linear regression equation, and performing frequency compensation on the quartz crystal oscillator according to the difference between the output frequency prediction value and a target frequency prediction value. Through the method and the corresponding system, the frequency stability and the anti-interference capability of long-term operation of the quartz crystal oscillator system and the overall operation reliability of the terminal equipment can be greatly improved.

The invention belongs to the technical field of medical robots, and discloses a surgical robot accurate pose real-time registration method and system based on multi-sensor fusion, and the system comprises a multi-source sensing collection assembly; a time-space calibration mechanism; fusing a resolving platform and an exception elimination platform; a deformation sensing and dynamic compensation device; and a registration result closed-loop feedback unit. According to the invention, a multi-source sensing acquisition assembly and a synchronous control board are integrated on a hardware level, a nanosecond timestamp is generated by using a high-precision clock driven by an onboard crystal oscillator, and a cross-correlation delay calculation chip is combined to execute a cross-correlation function method delay estimation formula, so that microsecond-level accurate correction of delay amount among sensing sources is realized; the coordinate transformation unit automatically selects a matched calibration matrix according to a correction result, multi-source data such as optical positioning, inertial measurement, a torque sensor, ultrasonic or electromagnetic positioning and the like are unified to a global rectangular coordinate system, and the structure can effectively ensure the consistency of time and space references of data output by different sensors.

The utility model discloses a cloud battery management monitoring device for a new energy automobile. The cloud battery management monitoring device comprises a shell, the main control board comprises a main control chip, an indicating lamp circuit, a crystal oscillator circuit, a plurality of reset circuits, a first filtering voltage stabilizing circuit, a serial port module, a USB module, a CAN conversion module, an SWD burning interface and a charging and discharging circuit. The slave control board comprises a battery pack acquisition module, a slave control chip, a daisy chain circuit, an AFE analog front end, an isoSPI communication interface, a battery equalization circuit, a discharge voltage detection circuit, a digital isolator and an NTC circuit; the slave control chip is connected with the battery pack acquisition module, the discharge voltage detection circuit, the daisy chain circuit, the digital isolator, the AFE analog front end, the isoSPI communication interface, the NTC circuit and the battery equalization circuit through pins. The utility model has the characteristic of improving the energy utilization rate of the battery pack.

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 provides a software time synchronization implementation method of a sensor, which is applied to a scene that the sensor communicates with an SOC (System On Chip) end in a request and response mode, when the SOC end sends a request signal to the sensor, the SOC records the moment as a sensor request sending moment, and after the request signal reaches the sensor, the sensor sends the request signal to the sensor. An on-chip moment generated when recording data is obtained in a data packet obtained by the sensor, wherein the moment comprises an accumulative error caused by instability of a crystal oscillator; meanwhile, recording the response arrival time when the sensor sends the data packet to the SOC; obtaining an estimated value of the nth accumulative error by using a Kalman filtering model; according to the estimated value of the accumulative error and the on-chip moment of the nth moment, calculating to obtain a corrected sensor measurement moment; according to the invention, the time lines of the plurality of sensors and the real time line of the SOC are respectively projected, so that the time of the plurality of sensors can be corrected to the same time reference, and the time synchronization of the multi-sensor system is realized.

The invention discloses a multifunctional hydraulic system experiment table, which relates to the technical field of hydraulic system experiment tables and comprises a time base line synchronous control module, a phase lock correction stability control module, a false peak identification and correction module, a multi-dimensional fault-tolerant judgment control module and a reverse energy slow-release anti-reverse module. And the time base line synchronous control module is used for establishing a cross-sensor unified time base line control structure, generating a synchronous reference surface by using a high-stability crystal oscillator signal, and executing nanosecond phase calibration on sampling signals of the pressure sensor and the flow sensor by taking the synchronous reference surface as a unified time reference. According to the invention, high-precision synchronous acquisition of pressure and flow signals is realized through unified time base line and phase locking correction, and high-pressure transient test data is ensured to be real and stable; and meanwhile, control logic is reconstructed, and an energy slow release strategy is introduced, so that the pressure relief process is stable and controllable, pump reverse rotation and structural impact are avoided, and the safety, reliability and self-healing stability of the experiment table are remarkably improved.

The invention discloses an electric power synchronous meter reading method and an electric power synchronous meter reading device, relates to the technical field of electric power meter reading, and solves the technical problems that a time calibration updating mechanism of meter reading equipment is imperfect and a system multi-dimensional verification analysis process is lacked for periodically acquired data. The calibration is carried out according to the quartz crystal oscillator pulse per second and continuous interaction with an authoritative time service source is carried out, so that the operation and maintenance first-aid repair speed and the power data time dimension accuracy are improved, the power-on network access multi-link fine control is carried out, the network connection stability is ensured, the data report loss is avoided like remote office VPN automatic reconnection, and the power data is supported to be continuously and stably transmitted to a master station. Multi-dimensional verification classification is carried out on collected data, a solid and reliable data basis is provided for electric power allocation and cost accounting, system upgrading, parameter change intelligent monitoring and initialization are executed according to on-demand priorities, the stability and maintainability of equipment are improved in the whole process, stable operation of meter reading equipment is guaranteed, and fault shutdown is reduced.

The invention discloses a full-localization ultra-high-speed multi-channel ADC (Analog to Digital Converter) acquisition and processing platform, and relates to the technical field of signal processing. The platform comprises a high-stability clock distribution calibration module, a synchronous acquisition and pulse injection module, a pulse detection and integer deviation module, a coarse-grained translation alignment module, a sub-sampling phase extraction module, a fractional delay interpolation alignment module, a hierarchical storage and flow control module and a high-speed interface synchronous output module. Multi-channel sampling clock synchronization is realized through FPGA dynamic phase adjustment; performing coarse-grained translation by injecting calibration pulses to detect integer deviation, extracting a sub-sampling phase difference, and adopting fractional delay filtering to realize sub-sampling precision alignment; hierarchical storage and intelligent flow control are carried out according to priorities, and synchronous data flow is output through a domestic high-speed interface; through a full-flow domestic chip and a synchronous correction technology, sub-sampling precision alignment and hierarchical flow control output of a multi-channel ADC at an ultrahigh sampling rate are realized.

The invention discloses a crystal oscillator circuit fault classification technology based on a multi-source information fusion network, and belongs to the technical field of analog circuit fault diagnosis. Firstly, a multi-source data set of different measurement points of the crystal oscillator circuit is acquired; carrying out conversion from a time domain to a frequency domain on the data set by utilizing fast Fourier transform; extracting data fault features by using a convolutional neural network, and performing a trust distribution function under each piece of source data by using a softmax classifier; fusing different trust distribution functions under the multi-source data by adopting a D-S evidence theory to obtain a final diagnosis result and diagnosis probability output, and calculating cross entropy loss; and finally, training model parameters through back propagation to obtain a final diagnosis model. According to the method, the time-frequency transformation algorithm, the deep neural network algorithm and the information fusion algorithm are combined, a multi-source information fusion network is constructed, the defects of an existing diagnosis model in crystal oscillator circuit fault classification are overcome, and the accuracy and stability of crystal oscillator circuit fault diagnosis are remarkably improved.

The invention discloses a time service module and electronic equipment. The time service module comprises a programmable logic module, a main control module and a crystal oscillator module; the programmable logic module is connected with the crystal oscillator module, the crystal oscillator module outputs a clock frequency signal, and the programmable logic module outputs a first pulse signal according to the clock frequency signal; the programmable logic module comprises a source end logic gate unit, an output end logic gate unit and a counting unit, the source end logic gate unit is connected with a source pulse signal, the output end logic gate unit is connected with a first pulse signal, and the counting unit is connected with the source end logic gate unit and the output end logic gate unit; the counting unit outputs a first data signal according to the number of the switched-on logic gates in the source end logic gate unit and the number of the switched-on logic gates in the output end logic gate unit; the master control module calculates the phase difference between the first pulse signal and the source pulse signal according to the first data signal. The time service module provided by the invention has relatively high locking precision.

The invention relates to a time synchronization parameter tracking method based on unknown Kalman filtering, which belongs to the technical field of time synchronization, and comprises the following steps: S1, modeling the output frequency of a clock crystal oscillator and the change rule of the temperature of the environment where the clock crystal oscillator is located into a quadratic function for a network communication scene with dynamic change of the environment temperature, introducing the temperature influence factor as an unknown quantity into a clock parameter tracking state equation; s2, establishing a clock observation equation by using a precise time synchronization protocol bidirectional information interaction process, and constructing a clock phase offset and clock frequency offset combined tracking state space model under the dynamic change of the environment temperature in combination with a clock state equation; and S3, by using unknown quantity Kalman filtering and taking minimum variance unbiased estimation as a criterion, jointly tracking a clock frequency offset value and a clock phase offset value for the established clock state space model.

The invention discloses a chip atom vector magnetometer based on a topological posture surface emitting laser. The device is characterized by comprising a topological posture PCSEL, a beam shaping unit, a polarizer, a quarter-wave plate, a voltage-controlled laser polarization rotator, an atomic gas chamber, a Wollaston prism, a dual-channel photoelectric detector, a filter module, a laser frequency stabilization unit, a precession signal modulation and demodulation module and a laser polarization and Larmor magnetic field direction adjustment module, the system comprises a two-dimensional Larmor magnetic field coil, a servo feedback module, a direct digital frequency synthesis module and a high-stability crystal oscillator. The topological posture laser is used for the chip atom vector magnetometer, magnetic vector parameter measurement which is more immune to temperature fluctuation and more excellent in performance is innovatively achieved for an external magnetic field, complete information of the vector magnetic field can be measured at the same time, and the chip atom vector magnetometer can be used for the fields of material defect detection, mineral oil and gas exploration, underwater magnetic target positioning and the like.

The invention relates to the technical field of cable fault positioning, in particular to a cable fault accurate positioning method based on multi-channel synchronous acquisition, which comprises the following steps: S1, constructing a multi-channel adaptive acquisition system which comprises a main controller, a multi-channel acquisition module, a synchronous control module and a data transmission module; s2, multi-channel data synchronous acquisition is carried out through the synchronous control module, wherein the multi-channel data comprises impedance data, temperature data, partial discharge signals and insulation resistance data; during use, through a multi-channel adaptive acquisition design, monitoring channels can be flexibly selected according to cable materials, operation years and environmental conditions, different aging fault characteristics are comprehensively covered, the fault omission ratio and the false alarm rate are reduced, different types of low-voltage cables are adapted, a synchronous scheme of constant-temperature crystal oscillator and hardware triggering is adopted, and the reliability of the system is improved. The method does not need to depend on a GPS / PTP time service module, is favorable for saving cost input, and eliminates environmental interference and single parameter false triggering.

The invention relates to the technical field of clock module precision control, in particular to a clock module precision improving method based on GRU model prediction. Comprising the steps of obtaining frequency drift data and temperature data of a plurality of groups of crystal oscillators of the same model; performing wavelet change filtering on the obtained frequency drift data; constructing a GRU neural network model by using the filtered frequency drift curve and the temperature change curve, and training the GRU neural network model; the prediction model effect is verified through the test set; real-time frequency and temperature data of the crystal oscillator are obtained, and a frequency drift predicted value is obtained through calculation; and compensating the crystal oscillator voltage according to the frequency predicted value. According to the technical scheme, the problems that an existing high-precision clock module is high in power consumption and high in cost can be solved, and meanwhile high-precision time reference in various environments is achieved.