192results about How to "Improve anti-electromagnetic interference performance" patented technology

The invention discloses a transformer intelligent temperature monitoring device based on a monitoring technology, which relates to the technical field of transformer intelligent temperature monitoring and comprises a temperature sensing module, a data processing module, a fault diagnosis module, a data transmission module and a remote monitoring module. And the temperature sensing module is used for acquiring temperature information of each key part of the transformer in real time. According to the invention, high-precision temperature monitoring is realized through the fiber grating sensor, the anti-interference capability is enhanced, and accurate fault diagnosis is realized through the GRU neural network and the fuzzy logic algorithm. And a dual-channel redundancy communication mechanism is adopted to ensure the stability and safety of data transmission. A Web-based remote monitoring platform improves the operation convenience, and a multi-level alarm function ensures safe operation. The system integration module realizes seamless connection with the existing power monitoring platform, has high adaptability and expansibility, reduces the deployment cost, and improves the equipment management efficiency.

The invention discloses an optical fiber temperature and pressure sensor based on a spherical lens and a preparation method thereof, and the sensor comprises a filler neck which is internally provided with a pressure medium channel; the sensitive diaphragm separates the pressure medium channel from the internal structure of the sensor, and can sense the pressure change of the pressure medium and convert the pressure change into self deformation; the optical fiber insertion core is used for fixing an optical fiber, so that the front end face of the optical fiber is close to and right faces the sensitive element sensitive diaphragm to form an optical FP cavity so as to realize pressure measurement; the spherical lens is used for converging light beams, improving the coupling efficiency of light entering the optical fiber end face and improving the optical signal intensity; the flat plate lens forms a reference FP cavity and is used for measuring temperature; the diaphragm base is used for mounting and fixing the sensitive diaphragm, the flat plate lens, the spherical lens and the optical fiber insertion core and ensuring that the sensitive diaphragm, the flat plate lens, the spherical lens and the optical fiber insertion core are coaxial and the relative positions are not changed; according to the scheme, the optical fiber has the characteristics of small size, high temperature resistance, high insulating property, high electromagnetic interference resistance and the like, and can be used for a long time in a high-temperature environment to measure the temperature and the pressure at the same time.

The invention relates to a laser wireless energy and signal synchronous transmission system, in particular to a laser wireless energy and signal synchronous transmission system for a rotary motion mechanism, which is used for solving the defect that the existing SLWPIT technology still has more limitations in the application of a rotary mechanism although the existing SLWPIT technology meets the requirement of long-distance transmission to a certain extent. The laser wireless energy and signal synchronous transmission system for the rotary motion mechanism comprises a stator part and a rotor part, and considers that an all-optical link realizes laser wireless energy and signal synchronous transmission in a rotary state from the system level, so that stable energy transmission efficiency can be kept in the rotary state; the system has good anti-electromagnetic interference capability and strong environmental adaptability.

The invention discloses a command vehicle rack-mounted power supply management system, and the system comprises a power supply filtering module which carries out the filtering of power supply input, and removes the high-frequency electromagnetic interference possibly carried by a power line; the electromagnetic shielding module is used for shielding electromagnetic radiation inside and outside the system; the grounding management module is used for providing a unified grounding point of the system and ensuring that all electrical connections have the same potential so as to reduce electromagnetic interference generated by the difference of the grounding point; the signal transmission optimization module is used for ensuring that signal transmission channels inside and outside the system are not influenced by electromagnetic interference; the electromagnetic interference suppression module is used for suppressing transient high-frequency interference generated in the system; and the environment monitoring and feedback module is used for monitoring electromagnetic environments inside and outside the rack in real time and automatically adjusting an EMC protection strategy of the system according to monitoring data so as to adapt to different working conditions. The command vehicle can adapt to a complex electromagnetic environment and ensure stable operation of equipment in the command vehicle.

The invention discloses a gyro accelerometer output system based on a photoelectric encoder, which is characterized in that photoelectric signals of the photoelectric encoder are converted into pulses with polarity in positive and negative directions and counting is carried out when a gyro accelerometer carries out precession, so that measured apparent acceleration is obtained; in-situ replacement of an original variable magnetoresistive sensor output system is realized. The invention provides a new technical scheme for obtaining the apparent acceleration, the output precision limitation of the original variable magnetoresistive sensor is broken through, the precision of the pendulum gyroscope accelerometer is improved, and the anti-electromagnetic interference capability is strong.

The invention relates to the technical field of cables, and provides an anti-electromagnetic interference control cable, which comprises a group of wire cores, a wrapping layer wrapped outside the group of wire cores, a first shielding layer wrapped outside the wrapping layer, an outer sheath wrapped outside the first shielding layer, a filling layer, a butt joint sleeve, a butt joint assembly, an electromagnetic shielding assembly and a thermal shrinkable sleeve, a filling layer is arranged outside one group of wire cores, a wrapping layer is coated outside the filling layer, butt joint sleeves are detachably mounted at two ends of each wire core, a butt joint assembly is fixedly mounted between each group of adjacent wire cores, an electromagnetic shielding assembly is mounted on each butt joint assembly, and a thermal shrinkable sleeve is fixedly mounted between two opposite outer sheaths. The cable solves the problem that the anti-electromagnetic interference capability of the cable is reduced due to the fact that the joint of the cable is prone to electromagnetic interference and electromagnetic leakage caused by the lack of good shielding and insulation protection in the prior art.

The invention discloses a multichannel optical fiber fluorescent temperature measuring device and method for an electrostatic chuck in an etching machine, and relates to the technical field of semiconductor etching. The device comprises temperature measurement sensors arranged in different areas of an electrostatic chuck, and each temperature measurement sensor comprises a fluorescent temperature measurement head, a ceramic sleeve, a switching optical fiber, a transmission optical fiber, an optical coupling module, a photoelectric detection module and a working light source module; wherein the fluorescent temperature measuring head comprises a fluorescent layer and a heat conducting layer which are stacked, the fluorescent layer is prepared through a hot pressing sintering method, the end face of the fluorescent layer is plated with gold, the heat conducting layer comprises a copper-diamond composite material, the end face of the heat conducting layer is plated with gold and is connected with the end face of the fluorescent layer through a vacuum backflow void-free welding process, and the ceramic sleeve wraps the switching optical fiber. The end face of the ceramic sleeve is plated with gold and is connected with the fluorescent temperature measuring head through a vacuum backflow void-free welding process. By adopting the device, the temperature measurement precision can be effectively improved, the temperature measurement range can be effectively widened, and the temperature distribution on the surface of the semiconductor wafer can be accurately measured.

The invention discloses a carrier synchronization method for a parallel converter sharing an AC / DC bus, and the method comprises the steps: employing a layout of one main device, one standby device and multiple slave devices, enabling the main device to transmit a synchronization signal when the main device is normal, and enabling the standby device and the slave devices to receive the synchronization signal; arranging an optical fiber transmitter and an optical fiber receiver on each device; the carrier synchronization method of the multiple parallel converters comprises the following steps: in a normal mode, when carrier counting of an EPWM1 register in a main equipment DSP reaches 0, a synchronization signal is generated, and carriers in an EPWM2-EPWM6 register in the main equipment DSP receive the synchronization signal internally; the synchronizing signal is led to a GPIO pin through an Output X-BAR register in the DSP of the master device, then an electric signal is converted into an optical signal through an optical fiber transmitter in the master device, and the optical signal is sent to the standby device and the slave device.

The utility model discloses a miniature motor with strong anti-electromagnetic interference performance, comprising a motor casing, the inner wall of the motor casing is fixedly connected with a first shielding arc plate and a second shielding arc plate in sequence from front to back, and the outer surface of the motor casing is fixedly connected with an upper flux sleeve and a lower flux sleeve in sequence from top to bottom. The upper surface of the motor shell is fixedly connected with an upper shielding cover, and the lower surface of the motor shell is fixedly connected with a lower shielding cover. The first shielding arc plate, the second shielding arc plate, the upper magnetic conductive sleeve and the lower magnetic conductive sleeve are used for inner layer protection and outer layer protection of the micro motor respectively; the upper shielding cover and the lower shielding cover are used for protecting the ends at the two ends of the micro motor respectively, the first shielding arc plate and the second shielding arc plate provide main double-layer strong anti-electromagnetic interference with the upper magnetic conductive sleeve and the lower magnetic conductive sleeve, and the upper shielding cover and the lower shielding cover are used for assisting in providing anti-electromagnetic interference for the ends. Therefore, anti-electromagnetic interference at the inner layer, the outer layer and the end of the micro motor is provided.

The invention relates to a direct-current electric field sensing system with a rotating structure, which realizes accurate measurement of a direct-current electric field. The system comprises a laser, a rotating structure and a detector, the rotating structure comprises a single-mode fiber slip ring, a collimating mirror, a polarizing film, a 1 / 4 wave plate, a crystal and a multimode fiber slip ring. Experimental results show that the scheme has the advantages of high response speed and strong anti-electromagnetic interference capability, and the aims of inhibiting light beam offset, realizing light beam collimation and achieving high-precision measurement can be fulfilled by utilizing the rotating structure and the optical fiber slip ring.

The invention relates to the technical field of inverters, in particular to a three-phase resonance pole type inverter with low switching loss and wide voltage output range. The inverter comprises a DC voltage source module, a Y-type inversion module, an MOSFET control module, a resonance pole type soft switching module and a three-phase load module. According to the utility model, a Y-shaped inverter structure is adopted, so that wide-range voltage output is obtained, and more types of motors can be driven. Besides, a resonance pole type soft switching module is added to the inverter bridge switching part, so that the inverter can significantly reduce switching loss, and the inverter can have good operation efficiency under high switching frequency. Compared with a traditional three-phase resonance direct-current link inverter, the three-phase resonance direct-current link inverter has a wider output voltage range and lower switching loss, electromagnetic interference and noise pollution of the inverter under high switching frequency can be effectively reduced, and the three-phase resonance direct-current link inverter is very wide in application prospect.

The invention discloses a tower inclination angle monitoring system based on a photoelectric oscillator, and relates to the technical field of tower inclination angle monitoring, which comprises the following steps of: mapping angle information to OEO oscillation frequency, and resolving an inclination parameter in real time by utilizing a field programmable gate array (FPGA) to complete online monitoring of the tower inclination angle. The feasibility and effectiveness of the system for monitoring the inclination angle of the tower in real time are verified through experiments.

The invention discloses a lightweight high-strength power cable based on a composite material and application thereof, belongs to the technical field of cable preparation, and aims to solve the technical problem that the lightweight and anti-electromagnetic interference performance of a lightweight cable in the prior art needs to be further improved. The cable comprises a conductor layer, a light shielding layer, a wrapping layer and a composite sheath layer which are sequentially arranged from inside to outside, modified carbon spheres are introduced into a titanium dioxide aerogel structure for filling and loading copper particles, obtained composite aerogel serves as a filling material of the light shielding layer, the modified carbon spheres serve as a cross-linking agent and a filling material of light polyurethane, and the light shielding layer and the composite sheath layer are formed. The composite aerogel and the lightweight polyurethane significantly reduce the density of the cable and significantly improve the lightweight performance of the cable, and through the synergistic cooperation of the copper particles, the titanium dioxide aerogel structure and the hollow carbon spheres, the anti-electromagnetic interference performance of the material is significantly improved.

The utility model provides a toxic gas detector control circuit capable of resisting electromagnetic interference, which comprises a power supply voltage regulation circuit, a temperature signal acquisition circuit, a sensor voltage regulation circuit, a sensor acquisition control circuit and a gas detector main control circuit which are in power supply connection. The gas detector main control circuit is in control connection with the 485 communication circuit, the acousto-optic prompt circuit, the LED state display circuit and the digital display screen, the gas detector main control circuit is in communication connection with the sensor acquisition control circuit, and the sensor acquisition control circuit is in control connection with the gas signal acquisition circuit and the temperature signal acquisition circuit. A TVS (Transient Voltage Suppressor) tube, a common mode inductor and a diode are arranged in the power supply voltage adjusting circuit; and a TVS tube and a diode are also arranged in the gas detector main control circuit. The poisonous gas detector has the beneficial effects that the anti-electromagnetic interference capability, the reliability and the stability of the poisonous gas detector when the poisonous gas detector is independently used are greatly improved.

The invention relates to the technical field of new energy automobile accessories, in particular to a new energy brake pedal assembly and a new energy automobile. A new energy brake pedal assembly comprises a pedal arm, the two ends, in the extending direction, of the pedal arm are the first end and the second end respectively, and a connecting part is arranged between the first end and the second end; the connecting part is rotatably connected with the fixed bracket; the second end is used for driving the movable column to move in the first direction; the limiting plate is connected with the movable column; an elastic contact of the elastic contact type slide rheostat abuts against one side of the limiting plate. And the circuit board is electrically connected with the elastic contact type slide rheostat. Compared with the prior art, the technical problem that in the process that the swing angle of the pedal arm is measured through an angle sensor, an angle signal output by the angle sensor is prone to being unreliable is solved.

The invention discloses a low-voltage power utilization inspection load identification device, which relates to the technical field of power utilization inspection and comprises a load monitor body, and a control panel is arranged at the top of the load monitor body. During use, the magnetic isolation cover shields part of electromagnetic interference firstly, and when the magnetic field of the electromagnetic interference reaches the square rubber ring, the hydroxyl iron powder particles are magnetized under the action of the magnetic field to offset part of the external magnetic field. And the square rubber ring adopts a rubber material as a base body, so that the overall anti-electromagnetic interference performance can be improved. The pull plate is moved downwards, the pull rod drives the connecting plate and the limiting rod to move downwards, then one end of the tooth binding strip is pulled, the tooth binding strip is tightened, the square rubber ring is tightly attached to the joint of the load monitor body and the shell, tightness is improved, the electromagnetic interference prevention effect can be improved, and the influence on data acquisition accuracy is reduced.

The invention discloses a water turbine vibration monitoring method based on an optical fiber sensing technology. The method comprises the following steps: 1, installing and fixing an optical cable; 2, starting the optical cable and the water turbine, generating a reflected light signal by an optical fiber sensor on the optical cable, and then obtaining a dominant frequency amplitude and vibration data; 3, performing high-pass filtering and noise reduction processing on the vibration data; fourthly, the power of the water turbine is inverted according to the main frequency amplitude, and then an alarm threshold value is adjusted in a self-adaptive mode according to the power; 5, when the vibration data of the optical fiber sensor exceeds an alarm threshold value, giving an alarm, recording the alarm duration, then analyzing the vibration data, and carrying out first-level alarm or second-level alarm; the optical fiber sensor is used for monitoring vibration, and the anti-electromagnetic interference performance of the optical fiber sensor is good, so that the vibration monitoring effect is good; and the alarm threshold value is adjusted in a self-adaptive manner, so that false alarm or missing alarm cannot occur, and the precision is relatively high. Therefore, according to the design, the vibration monitoring effect is good, and the monitoring precision is high.

The invention discloses a copper-silver alloy, a copper-silver alloy plated optical fiber, an optical fiber panel and a preparation method and application of the copper-silver alloy plated optical fiber. The sum of the content of copper and the content of silver in the copper-silver alloy is larger than or equal to 99.995 wt%, and the content of silver ranges from 92 wt% to 95 wt%. The technical problem to be solved is that optical fiber monofilaments plated with copper-silver alloy layers are used for preparing the optical fiber panel, so that the optical crosstalk resistance and the electromagnetic interference resistance of the prepared optical fiber panel are remarkably improved, and high-resolution image transmission of the optical fiber panel with optical crosstalk resistance and high-frequency electromagnetic pulse resistance is realized.

The utility model belongs to the technical field of automobile controllers, and discloses a controller shell and a controller, the controller shell is used for protecting a circuit board in the controller, the circuit board is provided with a plurality of communication terminals, the controller shell is correspondingly provided with openings for placing the communication terminals, the controller comprises an upper shell, a lower shell and a current isolation piece, the circuit board is placed in a space formed by buckling the upper shell and the lower shell, the current isolation piece is detachably connected to the inner wall, facing the circuit board, of the upper shell, is in a plate shape and is vertically connected to the upper shell and the circuit board, and the current isolation piece is located between an electronic device on the circuit board and a communication terminal connecting hole. The current isolation piece comprises a plate-shaped shell assembly and conductive foam, a containing groove is formed in the plate-shaped shell assembly, the conductive foam can be contained in the containing groove, and the face, provided with the conductive foam, of the current isolation piece is attached to the circuit board. The controller shell improves the overall electromagnetic compatibility of a controller, and is low in manufacturing cost and high in universality.

The invention discloses a telescopic spaceflight cable suitable for a transformable aircraft, which is formed by sequentially coating an inner layer, a central layer and an outer layer from inside to outside, and the inner layer and the outer layer synchronously and elastically stretch out and draw back. The inner layer is an elastic support body, the central layer is a wire roll body formed by winding a plurality of specially-made wires according to a specific rule, the outer layer is composed of a heat-proof protective sleeve, the heat-proof protective sleeve is composed of a plurality of sections of ripples, and the specially-made wires adopt a composite material multi-layer shielding structure, so that the anti-electromagnetic interference capability of the wire is improved while the flexibility of the wire is ensured. The cable can meet the use requirements of a deformable aircraft cable for being telescopic, small in size, low in weight, resistant to electromagnetic interference and resistant to high temperature.

This invention discloses a differential VGA signal decoding and display device, relating to the display field. It includes a signal input module, an ESD protection module, a differential receiving module, a synchronization separation module, an image decoding driver module, a display module, an audio processing module, and a control module. These modules are interconnected and work together to decode, process, and display differential VGA signals. This differential VGA signal decoding and display device solves the problems of short transmission distance, weak anti-interference capability, limited resolution, and high power consumption associated with traditional VGA interfaces. It also achieves full compatibility with traditional VGA devices, integrating audio processing, local playback, intelligent signal enhancement, and remote monitoring and management functions. It achieves reliable conversion from analog to differential signals, supports high-definition display, and has a transmission distance of up to 50 meters, while maintaining full compatibility with traditional VGA devices. This technology is particularly suitable for professional fields such as industrial automation and medical imaging, meeting the diverse display and intelligent operation and maintenance needs of professional scenarios.

The invention discloses an array type laser ignition system and method for a safety air bag gas generator. The system comprises a collision sensor, a central control system, an array type laser emission assembly, an external pipe shell and a safety air bag. The array type laser emitting assembly comprises a positive electrode shell, a negative electrode shell, a laser semiconductor light-emitting chip array plate, a gold wire, a lens sleeve shell, a collimating lens and a focusing lens. Laser semiconductor light-emitting chips are distributed on the laser semiconductor light-emitting chip array plate in an array manner; the ignition method comprises the steps that when an automobile is collided, the collision sensor detects collision force, a signal of the collision force is transmitted to the central control unit, the central control unit judges the collision state according to the amplitude and time of the signal and preset parameters, and the central control unit sends an ignition signal mode of the array according to the collision state. The ignition output form and the output energy are controllable, and the situation that the safety air bag stops working due to the fact that a single ignition element breaks down is avoided.

The present invention provides a self-diagnostic and self-positioning steel strand smart cable, which is mainly made of multiple bundles of optical fiber Brillouin sensing smart steel strands that are parallel or twisted into bundles and hot-extruded with polyethylene protective sleeves. Each bundle of optical fiber Brillouin sensing smart steel strands has an optical fiber Brillouin sensing smart tendon as the central wire and a high-ductility metal foil wrapped on its surface, and then is reversely twisted with the outer wires of the steel strand in the order of stripping ordinary steel strands. The diameter of the optical fiber Brillouin sensing smart tendon is the same as the central wire of the ordinary steel strand. The self-diagnostic and self-positioning steel strand smart cable proposed by the present invention has distributed, full-scale real-time monitoring characteristics, and can realize real-time diagnosis and precise positioning of common forms of local damage occurring to any outer wire of any steel strand of any bundle of optical fiber Brillouin sensing smart steel strands in the cable, and can be widely used in the health monitoring of cable-type structures such as bridge hangers and inclined cables, and provide important support for their service safety.

The application discloses a kind of live detection devices of pole-mounted transformer internal insulation defects, including acquisition terminal, telescopic insulating rod, intelligent analysis terminal;The first side of acquisition terminal is provided with acoustic sensor and is used to adsorb to the surface of pole-mounted transformer adsorption component, and acoustic sensor is used to collect voiceprint partial discharge signal;The top of insulating rod is provided with connecting component for disassembling acquisition terminal;Intelligent analysis terminal is connected with acquisition terminal, for whether there is insulation defect in pole-mounted transformer according to voiceprint partial discharge signal analysis inside.The above-mentioned live detection device of pole-mounted transformer internal insulation defect can quickly and conveniently contact live detection to pole-mounted transformer, avoid the interface effect of box and air and air absorption attenuation, improve the anti-electromagnetic interference ability, accurately determine the internal insulation fault of transformer, improve detection sensitivity and accuracy, eliminate security risks as soon as possible, avoid transformer explosion.

The invention discloses a novel energy wireless transmission device and method based on electric field coupling, and aims to solve the problems that an existing parallel coupling mechanism has relatively serious electric field dissipation and a stacked coupling mechanism is insufficient in power transmission capability. The energy transmitting assembly and the energy receiving assembly are of an oppositely-embedded disc structure, a double-LC type resonance compensation network is adopted, and constant current output irrelevant to a load can be achieved. Compared with a parallel disc coupling mechanism, the electric field dissipation of the system to the external environment can be effectively reduced; compared with a stacked disc coupling mechanism, the power transmission capability of the coupling mechanism can be ensured. The power supply slip ring adopting the electric field coupling type wireless power transmission technology is high in electromagnetic interference resistance, small in size, light in weight and low in cost, the problems of abrasion and abrasive dust in power supply of a rotary slip ring are fundamentally solved, and meanwhile the cost and the weight of a power supply device are reduced. The invention relates to the field of wireless power transmission.

The utility model belongs to the field of comprehensive detector, specifically is four in one comprehensive detector of distribution network patrol, the lower part of patrol instrument casing is provided with handheld handle, the front side of the casing of patrol instrument is provided with display screen, the left side of patrol instrument is provided with external ultrasonic sensor module, the back of patrol instrument is provided with infrared detector module, the top of patrol instrument is provided with air ultrasonic sensor module, the upper portion of patrol instrument is provided with fitting assembly, acoustic detection module is clamped and is connected with fitting assembly, and the utility model discloses an open type working environment adopts acoustic detection module detection, and closed type working environment adopts air ultrasonic sensor module detection, and the local discharge area will show as high energy bright spot or macule on the image, thereby realizes the intuitive positioning and identification of local discharge position, can judge whether the equipment inside exists local discharge and the severity of discharge through the analysis ultrasonic signal amplitude, frequency, phase and so on, and the advantage of air type ultrasonic detection is that the anti-electromagnetic interference ability is strong, is applicable to the environment of high pressure, strong magnetic field.

The invention provides a bidirectional photoelectric measurement cooperative positioning method, which is used for realizing high-precision and low-delay cooperative positioning through bidirectional photoelectric distance measurement and direction finding and data link synchronization between an unmanned ship and a patrolling flight device when the navigation equipment of the patrolling flight device has short-time faults (such as electromagnetic interference, shielding and high maneuvering states). The unmanned surface vehicle and the patrolling flying devices measure the other one by using self photoelectric equipment respectively, and position estimation values of the two patrolling flying devices are independently calculated respectively based on the high-precision position of the unmanned surface vehicle; the collaborative weight coefficient is calculated according to the measurement error of the photoelectric equipment of the two parties, weighted average fusion is carried out at the patrolling device end, the optimized positioning result is directly output, and the delay error caused by back-and-forth transmission of a data chain is effectively avoided. And reliable positioning information can be obtained by the patrolling device in a complex electromagnetic environment and a maneuvering condition. The method is suitable for a cooperative scene of the unmanned surface vehicle and the patrol aircraft, and has the advantages of good real-time performance, strong anti-interference performance, low cost and the like.

The invention provides an eight-channel power division coupling module based on an air plate line. The eight-channel power division coupling module has the functions of transmitting a transmitted / received signal, sampling the signal and distributing the signal. In order to meet the requirements of high-power and low-loss transmission between the T / R assembly and the antenna unit, an air plate line is used as a main line of the coupler; in order to meet the light and thin requirements of an antenna array surface, a microstrip line is adopted as a coupling line, and low-power signal sampling is realized. Weak coupling is achieved between the main line and the coupling line in an aperture coupling mode. The power division function is integrated at the same time, the one-to-eight microstrip power divider, the microstrip coupling line and the rectangular coupling aperture are compactly arranged on the same microwave double-sided board, and therefore the low-profile and low-cost design is achieved.

The present invention provides a method for measuring world time, wherein a digital zenith telescope is installed on an observation pedestal with known astronomical longitude and latitude to observe stars, and the astronomical longitude and latitude of the station are calculated according to the astronomical positioning principle, and the deviation between the atomic clock time of the station and the UT1 time is calculated by comparing with the known astronomical longitude and latitude, and the output time of the atomic clock is adjusted to obtain the UT1 time signal. UT1 is measured and obtained in extraordinary times (when UTC cannot be obtained) to meet application needs. The present invention only needs to connect an external atomic clock that can be controlled to obtain the shooting time of each picture, and no longer relies on the UTC time provided by the GNSS receiver. At special times, only the instrument needs to be set up at a site with known station coordinates for astronomical observation, and UT1 can be quickly obtained. The equipment has a simple structure and mobile observation, and real-time measurement results can be obtained through observation.

The invention relates to the field of anti-electromagnetic technology, in particular to an anti-electromagnetic interference box body which comprises an anti-electromagnetic box body, a fixing frame arranged on one side of the anti-electromagnetic box body and a box door arranged on the outer side of the fixing frame and matched with the anti-electromagnetic box body, and the center of the inner side of the anti-electromagnetic box body is filled with a shielding plate. One side of the anti-electromagnetic box body is connected with a concentric-square-shaped electromagnetic shielding plate, one side of the concentric-square-shaped electromagnetic shielding plate is connected with a box door through a fixing frame, the fixing frame is of a concentric-square-shaped structure, an inner lining plate of the concentric-square-shaped structure is fixedly installed in the side, close to the concentric-square-shaped electromagnetic shielding plate, of the fixing frame, and the inner lining plate and the box door are matched and attached to each other. And a rotating shaft is rotationally connected to one side of the lining plate on the fixing frame. The movable shielding plate in the inner lining plate is unfolded through rotary closing of the box door, the movable shielding plate in the inner lining plate is retracted through rotary opening of the box door, back-and-forth switching is stable, the supporting plate and the connecting plate in the fixing frame operate stably and smoothly, and structural connection is stable and ingenious.