282 results about "Electromagnetic emission" patented technology

A computer implemented method that enables detection and mitigation of drilling hazards is described. The method includes determining time-domain electromagnetic parameters and obtaining data at multiple heights by at least one unmanned aerial vehicle equipped with at least one receiver as a time-domain electromagnetic transmitter emits electromagnetic radiation based on the time-domain electromagnetic parameters. The method also includes fusing the obtained data to generate a subsurface model.

The invention belongs to the technical field of unmanned aerial vehicle full-aviation electromagnetic detection, and particularly relates to a full-aviation frequency domain electromagnetic emission system and a control method. A broadband frequency mixing and matching circuit is connected in series between an H-bridge power inverter and an emission coil of an unmanned aerial vehicle electromagnetic emission system; the broadband mixing and matching circuit comprises a first resonance unit formed by connecting a fixed capacitor and an adjustable inductor in parallel and a second resonance unit formed by connecting a fixed capacitor and an adjustable inductor in parallel, and the first resonance unit and the second resonance unit are connected in series. The adjustable inductor is matched with the dynamic impedance of the inductive load by adjusting the inductance value, and the broadband frequency mixing and matching circuit can adjust the impedance in real time, so that the matching of different resonant frequencies is realized, and the frequency range of a matching signal can be obviously widened.

The invention discloses a sea water area karst cave group transient electromagnetic collaborative investigation data processing method and system, and the method comprises the steps: transmitting a wide frequency spectrum excitation signal to the seabed through a shipborne transient electromagnetic transmitting system, and synchronously collecting a secondary field attenuation signal responded by a seabed medium through a pull-type receiving array, meanwhile, a distributed sensor network is arranged at a preset seabed node to collect background noise base data; performing motion attitude compensation on the secondary field attenuation signal to generate transient electromagnetic response data; constructing an adaptive filter based on the background noise base data, performing noise suppression processing on the transient electromagnetic response data, and outputting noise suppression data; and performing space-time alignment on the noise suppression data of the towed array and the seabed node data to form a three-dimensional space sampling data set. According to the method, high-precision fusion of deep and shallow detection data and quantitative evaluation of the stability of the karst cave are realized, and the detection reliability and the engineering risk early warning capability of the complex ocean karst area are remarkably improved.

The invention provides a low-altitude logistics distribution method and system based on an electromagnetic launching unmanned aerial vehicle technology, and the method comprises the steps: installing a modular electromagnetic launching system in a designated region of a first logistics park; the unmanned aerial vehicle is connected with the modular electromagnetic emission system, and cargo loading and parameter calibration are carried out; dynamically planning a flight route of the unmanned aerial vehicle from the first logistics park to the second logistics park; the electromagnetic emission system is started to accelerate the unmanned aerial vehicle, and the pulse power modulation technology is utilized to control the output of specific pulse power in different stages, so that the unmanned aerial vehicle reaches a specified take-off speed within a preset distance range; the unmanned aerial vehicle autonomously flies along the flight route and autonomously performs obstacle avoidance and path correction, and the flight route or task sequence of the unmanned aerial vehicle is dynamically adjusted; and deploying a modular catapult stopping system in the second logistics park to complete stopping of the unmanned aerial vehicle. According to the invention, the acceleration efficiency can be improved to ensure that the unmanned aerial vehicle keeps a safe distance from the obstacle while keeping the distribution efficiency.

The invention discloses an electromagnetic emission test method of an intelligent household electrical appliance, which simulates a dynamic interaction process by controlling multiple modules to run simultaneously according to a preset logic, and comprises the following steps: acquiring electromagnetic signals in real time and performing frequency domain conversion to obtain frequency spectrum distribution; identifying a target frequency band which generates energy convergence due to non-linear superposition and peak intensity of the target frequency band; obtaining a superposition waveform sequence and classifying a nonlinear superposition mode; identifying an abnormal interference mode by combining the peak intensity and a mode classification result; associating the abnormal frequency band with the module operation log, and analyzing an interaction time sequence and logic to determine a cause; a filtering or regulation strategy is applied based on the cause, whether the peak value is reduced is verified and a report is generated. According to the invention, through energy convergence frequency band identification, non-linear superposition mode classification, interference cause tracing, directional regulation and closed-loop verification, accurate diagnosis and root positioning of hidden transient interference are realized, so that the test depth is improved, the rectification efficiency is optimized, and the predictability of product electromagnetic compatibility design is enhanced.

The invention relates to the technical field of exploration geophysics. The time-frequency domain three-dimensional forward modeling and feature analysis method based on the controllable source electromagnetic method comprises the steps that electrical parameter measurement processing is conducted on a target area rock ore specimen, and an electrical parameter set is obtained; based on the electrical parameter set, performing electrical category division processing through clustering analysis to generate an electrical classification knowledge base; acquiring an electromagnetic emission signal; performing time domain forward modeling calculation processing to obtain transient response; based on the electromagnetic emission signal and the electrical property classification knowledge base, performing frequency domain forward modeling calculation processing to obtain a specified frequency band response; performing parameter iterative optimization processing to generate a three-dimensional electrical parameter model; performing abnormal region extraction processing based on the three-dimensional electrical parameter model to obtain a target abnormal region; and carrying out boundary delineation processing on the target body to obtain a spatial position of the target body so as to achieve the technical effects of improving the characterization precision of the electrical parameters, reducing the reconstruction distortion of the time-frequency response and enhancing the geological interpretability of an inversion result.

The invention discloses a seabed dipole-dipole electromagnetic detection system and method carried on a remote control underwater robot, and belongs to the technical field of seabed metal mineral resource fine exploration. The system comprises a remote control underwater robot (ROV), a retractable receiving coil extension bracket, a transient electromagnetic transmitting coil, a transient electromagnetic receiving coil, a transient electromagnetic main engine room and an instrument fixing bracket. The extension bracket is controlled through the hydraulic retraction device, so that the receiving coil is arranged away from the ROV body, and the interference of the equipment body on electromagnetic signals is obviously reduced. The ROV performs low-altitude cruising on the seabed along a preset fine measuring line to acquire transient electromagnetic data, and the actually measured data is corrected in real time by using the full-space seawater environment response in the diving process, so that the system interference is effectively inhibited. According to the method, the high-resolution electromagnetic detection capability of ore bodies such as seabed polymetallic sulfide is improved, and the method is suitable for mineral resource investigation of complex terrains and small-scale regions.

The invention relates to the technical field of geophysical exploration, in particular to a semi-aviation transient electromagnetic detection system based on cooperation of a robot dog and an unmanned aerial vehicle, and the system consists of a robot dog platform, an unmanned aerial vehicle platform and a ground control station. The robot dog platform comprises a high-power transient electromagnetic transmitter, a line source laying module, a voice warning module and a mobile positioning module, and can automatically lay a line source and inject pulse current to the ground; the unmanned aerial vehicle platform comprises a visual field auxiliary module, a flight driving module and a receiving coil, and the coil can be dragged according to a preset route to collect electromagnetic data; the ground control station is used for job scheduling and data processing. Wiring-transmitting-receiving integrated collaborative operation is realized through the robot dog and the unmanned aerial vehicle, and the robot is suitable for detection of a complex mountain environment.

The invention discloses an electrical source transient electromagnetic ground-air detection method and system, and relates to the technical field of geophysical exploration. The method comprises the following specific steps: arranging a transient electromagnetic transmitting device and a receiving device in a detection area; carrying out ground-air transient electromagnetic measurement at different flight height positions to obtain a transient electromagnetic data total set; preprocessing electromagnetic data in the transient electromagnetic data set to obtain preprocessed data; data interpretation is carried out on the preprocessed data, an underground electrical structure is reconstructed by using an inversion algorithm, and a resistivity distribution image of the underground geologic body is obtained to identify a low-resistance abnormal region; and based on an inversion result, expressing spatial distribution and physical property parameters of the deep geologic body by adopting a three-dimensional modeling technology. According to the invention, the deep geological target body can be accurately explored, so that the accurate and detailed geological information of the deep geological target body can be obtained.

The invention belongs to the technical field of electronic system engineering, and discloses a digital channelized filtering electromagnetic compatibility management and control method. The invention provides a digital channelized filtering electromagnetic compatibility management and control method aiming at the situation that the interception probability of reconnaissance equipment is reduced by electromagnetic time domain management and control of a multi-sensor integrated system. According to the method, digital channelization filtering of a reconnaissance broadband receiver is used for filtering signals of transmitting frequency points of electromagnetic transmitting equipment in real time or limiting the frequency points of the electromagnetic transmitting equipment according to a channel where a high-value radiation source target is located, so that receiving / transmitting influences between equipment in a system are reduced; and the signal interception probability of the reconnaissance equipment in the multi-sensor integrated system is improved.

The present invention belongs to the technical field of material surface treatment, and discloses a method for enhancing the ablation resistance performance of an armature by selective laser melting and injecting refractory metals, which includes the following steps: grinding and cleaning the surface of the armature to be enhanced; designing the selective laser melting and injecting structure on the surface of the armature into different shapes according to the electromagnetic emission working conditions and the ablation characteristics of the armature; setting laser parameters, feeding refractory metal powder onto the surface of the armature to be enhanced based on the shape of the selective laser melting and injecting structure, and using the laser to perform laser melting and injection on the surface of the armature to be enhanced to form a melted and injected layer. After multiple meltings and injections, an enhanced armature composite structure with an alternating distribution of strengthened area melted and injected layers and non-strengthened areas is obtained on the surface of the armature. The present invention can solve the transition ablation problem caused by severe ablation of the armature in existing electromagnetic railguns.

A method for determining positional information of a target organ of a human subject during a biomagnetic field scan comprises detecting, by a plurality of magnetometers, first biomagnetic field signals from at least a portion of the human subject's organ and second magnetic field signals from an electromagnetic transmitter positioned on a predetermined position of the human subject. The plurality of magnetometers have a known position during the biomagnetic field scan. The method includes determining a time-varying spatial relationship between the electromagnetic transmitter and the plurality of magnetometers based on the detected second magnetic field signals. The method further includes correcting artifacts in the detected first biomagnetic signals in accordance with the determined spatial relationship.

The invention discloses an electromagnetic track damage detection method and system for multi-field coupling analysis, and relates to the technical field of electromagnetic track launching devices.The electromagnetic track damage detection method comprises the steps that simulated pivot track loop pulse current, armature mechanical parameters and armature kinematics parameters are obtained and imported into an electromagnetic heat multi-physics field coupling model, and a field-circuit coupling model is obtained; obtaining current density and temperature distribution along the boundary of the pivot rail contact interface and the boundary of the inner side of the armature groove in the simulation process under multi-physics field coupling; the optimal initial position of armature placement is determined according to the change of the current density and the temperature under different armature placement initial positions, and the optimal track material is determined according to the change of the current density and the temperature under different set electromagnetic emitter track materials; an electromagnetic track launching system simulation experiment platform is built, surface damage at different positions of a track is tested under different pulse current peak values and launching times, and track surface accumulated wear and ablation damage characteristics under different working conditions are clear.

The invention discloses an electromagnetic interference risk assessment method based on expert knowledge and a neural network, and the method comprises the steps: building an electromagnetic interference risk assessment index system of a to-be-assessed object, bottom layer indexes of the index system comprise a power grid ripple coefficient, power grid peak signal conduction emission, power grid harmonic characteristics, electromagnetic emission characteristics, electromagnetic sensitivity characteristics, filtering characteristics and conduction and radiation safety margin. Establishing a potential interference source and potential sensitive equipment electromagnetic compatibility evaluation data set by using an expert knowledge method; and using the neural network to carry out electromagnetic interference risk assessment training and assessment of the to-be-assessed object. The method can give full play to the advantages of strong pertinence and high flexibility of expert knowledge and the advantages of strong ability of automatic knowledge acquisition and nonlinear mapping of a neural network, and realizes adaptive assessment of electromagnetic interference risks according to real-time acquisition and analysis of an electromagnetic environment; according to the method, manual parameter setting is not needed any more, the evaluation process is easier to implement, and the reliability of the evaluation result is higher.

The invention belongs to the technical field of seabed hole domain electromagnetic detection, and relates to a hybrid multi-frequency reactive compensation method for a seabed electromagnetic emission system, which comprises the following steps of: designing a topological structure of a hybrid multi-frequency reactive compensation system according to an impedance matching requirement of a low-frequency emission frequency band of the seabed electromagnetic emission system; deducing a compensation strategy and an implementation method of the hybrid multi-frequency reactive power compensation system based on the multi-frequency reactive power compensation requirement of the load; and analyzing the influence of the reactive compensation combination proportion of the impedance matching part of the passive TCC and the impedance matching part of the active ICC on the requirement of the direct-current power supply voltage VICC, and carrying out parameter design of the passive TCC and the active ICC. According to the hybrid multi-frequency reactive compensation technology, the single-frequency reactive compensation capability is further expanded into self-adaptive dynamic compensation of multi-frequency reactive power in a wide frequency band; the additionally introduced active impedance matching part effectively improves the multi-frequency impedance matching precision, and the frequency spectrum energy utilization rate of multi-frequency transmitting signals is further improved in a low-frequency transmitting frequency band.

The invention belongs to the technical field of electromagnetic detection, and particularly relates to an electromagnetic detection transmitting system for urban underground space and a control method, the electromagnetic detection transmitting system comprises a direct current power supply, an inverter and a load which form a traditional electromagnetic transmitting circuit, and a composite impedance matching network is connected in series between the inverter and the load; the composite impedance matching network comprises an active matching network and a passive matching network, the active matching network comprises an H bridge circuit composed of four IGBT transistors and a coupling transformer, one output end of the inverter passes through one end of the secondary side of the coupling transformer, and the primary side of the coupling transformer is connected with the H bridge circuit; and one end of the passive matching network is connected with the other end of the secondary side of the coupling transformer, the other end of the passive matching network is connected with one end of the load, and the other end of the load is connected with the other output end of the inverter, so that the situation that the emission energy of the full-aviation emission system of the unmanned aerial vehicle is weakened due to dynamic impedance change generated in actual motion is avoided.

The invention belongs to the technical field of electromagnetic detection, and particularly relates to a self-adaptive multi-frequency resonance matching system and a design method, the self-adaptive multi-frequency resonance matching system comprises a magnetic coupling resonance module and a controllable variable impedance unit which are connected in series, a switch control capacitor comprises a matching capacitor and a control switch which are connected in parallel, and a switch control inductor comprises a matching inductor and a control switch which are connected in series; the magnetic coupling resonance module comprises an inductor and a capacitor, and the capacitor is connected with the inductor in parallel and then connected with the inductor in series. The signal strength of the multi-frequency grounding type electromagnetic transmitter is improved, and efficient transmission of the multi-frequency excitation signals is achieved.

The utility model discloses an electromagnetic induction eddy current heating electromagnetic emitter with magnetic shielding, the electromagnetic emitter comprises a magnetic shielding cover (1), a coil (2) and a coil support (3), the coil (2) comprises a coil main body (21) formed by conducting wires and a pair of coil pins (22), the coil support (3) comprises a support wall (31), a support bottom (32) located at the lower end of the support wall (31) and a pin through hole (33), and the support wall (31) is connected with the support bottom (32). The coil body (21) is arranged on the coil support (3), the coil pins (22) penetrate out of the pin through holes (33), and the coil body (21) is located in a coil space (14) defined by the coil support (3) and the magnetic shielding cover (1). The structure of the magnetic induction coil assembly is simplified, the magnetic shielding efficiency is improved, the provided electromagnetic emitter is high in integration degree, large-scale assembly production is facilitated, and the production efficiency of electronic cigarette appliances can be effectively improved.

The invention discloses an H-shaped armature of an electromagnetic rail gun, and belongs to the technical field of electromagnetic emission. The wind power generation device comprises a windward front surface, a windward curved surface, a windward inner surface, a top surface, a bottom surface, side surfaces, a leeward front surface, a leeward curved surface and a leeward inner surface, the graphene film is characterized in that both the top surface and the bottom surface are coated with graphene. According to the invention, the stability in electromagnetic emission is better, the emission efficiency can be effectively improved, and the graphene coating is coated on the surface of the armature in combination with the shape, so that the armature can reach a higher average speed and has a better arc ablation resistance effect, and the armature also has a certain lubrication effect; the conductive filler can be used as a good interface conductive filler to improve the contact state of a pivot rail interface. Therefore, the problems of'planing ', 'ablation', 'adhesion ', 'transition' and the like in the electromagnetic gun launching process are further improved.

The present invention discloses an on-train short-wave antenna for the electrified railway environment. The antenna as a whole is set as a circular closed loop and arranged inside the "electromagnetic space" formed by the metal car body, the high-voltage catenary and the rail, overcoming the risk of electric shock to personnel and equipment caused by the high-voltage electric field environment of the electrified railway catenary to short-wave electromagnetic emission, breaking through the interference of the magnetic field characteristics of the electrified railway electromagnetic environment to short-wave communication, greatly improving the gain performance of the short-wave antenna, and finally realizing the deployment of short-wave communication on the train in the electrified railway environment, enriching the technical means of railway vehicle-ground communication.

The invention discloses a magnetic resistance type electromagnetic coil emitter power supply based on a half-control switch and a control method, and belongs to the technical field of electromagnetic emission. Which comprises a primary power supply and a transmitting coil connected with the primary power supply, and is characterized in that a bridge circuit is arranged between the primary power supply and the transmitting coil, a pulse capacitor is arranged in the bridge circuit, and the pulse capacitor and the transmitting coil are connected through a first discharge loop and a second discharge loop; half-control switch devices are arranged in the first discharge loop and the second discharge loop, and the conduction directions of the first discharge loop and the second discharge loop are opposite and the first discharge loop and the second discharge loop are conducted in a time-sharing manner. According to the magnetic resistance type electromagnetic coil emitter power supply based on the half-controlled switch and the control method, the pulse capacitor and the direct-current power supply are combined, so that wide pulses can be generated, under the condition of the same acceleration effect, the current amplitude is greatly reduced, the magnetization saturation degree of an armature can be reduced, and the emission efficiency of a system can be improved.

The utility model relates to security door technical field especially relates to a kind of contraband security door detection device, including shell, blocking cross bar and drive assembly, the inside of shell is provided with stand, the outside of stand is provided with electromagnetic transmitter, the inside of shell is provided with electromagnetic receiver, the outside of stand is provided with rotating blocking cross bar, the top of shell is provided with detection camera, the side of shell is provided with partition wall and is divided into entrance side and exit side;The utility model is formed by shell and stand Rotary channel, and three sets of electromagnetic transmitter and electromagnetic receiver are set in channel to carry out repeated detection, reduce detection error rate, and the face is detected by detection camera at entrance, when there is dangerous personnel with dangerous cutter or detect that the personnel escape, personnel can be detected in shell, limit component is used to limit and stop rotating to blocking cross bar, personnel is locked in shell, prevent personnel escape or use cutter to suddenly rise and hurt person.

The present invention relates to a high ground stress release device and method for hard rock tunnels. The device includes a carrier, on which an electromagnetic gun launching device and a water injection device are provided. The carrier can move to the tunnel surrounding rock face. The electromagnetic gun launching device is used to launch electromagnetic shells to impact and damage the rock mass to be excavated, and the water injection device is used to inject water to cool the rock mass to be excavated. For the first time, the present invention combines electromagnetic emission technology and water injection and applies them to the stress release of deep-buried hard rock tunnels. By using the electromagnetic gun launching device to launch electromagnetic shells to impact the rock mass, the impact kinetic energy is converted into heat energy to raise the temperature of the rock mass and damage it, greatly reducing the stress level of the rock mass. The electromagnetic gun launching device still maintains within the normal temperature range and is not easily damaged. By injecting water through the water injection device, the temperature of the rock mass drops sharply, stimulating the length and width of the rock mass cracks, and it can also act repeatedly in a hot and cold cycle. Eventually, the rock mass is subjected to fatigue damage, which can effectively reduce the occurrence of strong rock bursts and extremely strong rock bursts, and can safely, effectively and rapidly improve the tunnel excavation efficiency.

The invention relates to the technical field of vehicle testing, in particular to an automobile electromagnetic compatibility digital test evaluation method and device, and the method comprises the steps: determining the type of an out-of-vehicle interaction device according to a test scene, and arranging an interaction device and an antenna of a corresponding type outside a reference vehicle; in the communication process of the reference vehicle and the interaction equipment, the degree of electromagnetic interference on communication is determined; determining the field intensity of each sub-band received by the antenna; according to calculation formulas of different limit value intervals, the weight of each sub-band in the test scene is obtained through fitting according to the degree of electromagnetic interference on communication and the field intensity; and collecting the actual test waveform of each sub-band emitted by the to-be-tested vehicle, and obtaining the evaluation result of the to-be-tested vehicle in the test scene according to the actual test waveform and the weight. According to the invention, the influence of vehicle electromagnetic emission on the outside is accurately reflected.

The invention discloses an ultrahigh-voltage constant-voltage clamping transmitting system for an electrical source transient electromagnetic method, and belongs to the technical field of ultrahigh-voltage constant-voltage clamping. Comprising a main power supply, an auxiliary power supply, a clamping capacitor, a main switch bridge circuit, a clamping switch, a current sampling module, a peak holding module, a comparator and a controller. According to the invention, the waveform quality of the high-power electromagnetic transmitter can be effectively improved, and the transmitting performance is improved from two aspects of a rising edge and a falling edge. Development of a near-source electromagnetic method including SOTEM is promoted, and more powerful technical support is provided for a deep prospecting strategy.

The invention discloses a muzzle arc energy and mass center spatio-temporal evolution analysis method and system, and relates to the technical field of muzzle arc analysis, and the method comprises the steps: building an electromagnetic track launch muzzle arc simulation experiment platform, and obtaining a muzzle arc image through a high-speed photographing system; an arc contour image is obtained based on a local adaptive threshold segmentation and morphological gradient extraction algorithm, and the integrity and robustness of arc contour extraction are improved; based on a robust centroid tracking algorithm of multi-connected domain energy fusion and time sequence consistency constraint, a final arc centroid is obtained, and stable positioning and tracking of the arc energy centroid in the full evolution stage are achieved; and quantitatively analyzing the time-domain evolution characteristics of the highlighted area of the muzzle arc and the law of the spatial motion trail of the mass center of the highlighted area based on the muzzle arc images at different muzzle speed. An effective means is provided for quantitative characterization of a bore port arc, and an experimental basis and a theoretical reference are provided for optimization of a bore port structure, anti-ablation design, regulation and control of emission working conditions and the like of an electromagnetic emission system.

The utility model discloses a vehicle-mounted electromagnetic propulsion remote fire extinguishing device, which belongs to the technical field of fire fighting equipment and comprises a vehicle body with a chassis, and a plurality of support legs are distributed on the outer edge of the chassis; the supporting leg comprises a horizontal telescopic part and a vertical telescopic part, the horizontal telescopic part comprises an outer sliding barrel and an inner sliding barrel, and the inner sliding barrel is connected with a first driving assembly for driving the inner sliding barrel to move; the vertical telescopic part comprises a bottom foot, a ball head rotationally connected with the bottom foot is arranged on the bottom foot, the ball head is connected with a second driving assembly for driving the ball head to move, and the second driving assembly is fixed to the inner sliding barrel; the electromagnetic emission assembly, the pulse power supply and the generator are all arranged on the chassis; the pulse power supply is connected with the electromagnetic emission assembly. The generator is connected with the pulse power supply and the electromagnetic emission assembly. The chassis can bear the electromagnetic emission assembly, the pulse power supply and the generator, the pulse power supply and the generator guarantee that the electromagnetic emission assembly provides electric energy, the supporting legs can provide supporting force for the chassis, and recoil force can be stably borne.

The invention discloses a strong electromagnetic protection design method for an electronic warfare unmanned aerial vehicle, and relates to the technical field of electromagnetic protection, electromagnetic interference and electromagnetic compatibility. Establishing an electromagnetic simulation model of the unmanned aerial vehicle and the electronic warfare load, and simulating the electromagnetic environment of the key position; distributing electromagnetic protection indexes of the electronic equipment according to the electromagnetic environment simulation result; front door protection design and rear door protection design are carried out on the equipment level, and comprehensive radio frequency management is carried out on the system level; and carrying out equipment electromagnetic compatibility test verification and full-system electromagnetic compatibility test verification, and finally ensuring compatible work of the unmanned aerial vehicle and the electronic warfare load. The invention provides a top-down strong electromagnetic protection design method for solving the electromagnetic compatibility problem caused by strong electromagnetic interference task loads such as a communication electronic warfare system and a radar electronic warfare system carried by the unmanned aerial vehicle, and the electromagnetic compatibility of the system is improved.

The invention discloses an electromagnetic pulse rescue communication system which comprises an array type electromagnetic receiver, an array type electromagnetic transmitter and a signal recognizer. The array type electromagnetic receiver is arranged on the ground and is used for collecting and transmitting electromagnetic signals; the array type electromagnetic transmitter is arranged underground and is used for transmitting coded pulse electromagnetic signals; and the signal recognizer is connected with the array type electromagnetic receiver and is used for analyzing the received electromagnetic signals and carrying out three-dimensional positioning on the emission source. The transient electromagnetic technology is adopted, the array type synchronous emission design is combined, the signal penetrability and coverage range are enhanced through the superimposed effect, the signal attenuation rate is low, signals can penetrate through a complex geological structure, and the communication distance is effectively prolonged.