Abstract: The disclosure pertains to the field of exploration based on electromagnetic method, and in particular relates to a method and device for surface-borehole transient electromagnetic detection, aiming at solving the problem that the loop source device cannot effectively detect the high-resistance layer. The device according to the disclosure includes grounded conductor wires as emission sources and underground receiving devices as receiving sources; wherein the grounded conductor wires are arranged on the ground; an existing borehole on the ground or an existing underground roadway is used, and receiving probes are arranged point by point in the borehole direction or in the horizontal direction of the roadway; the grounded conductor wires are composed of three sets of grounded conductor wires, wherein two sets of the grounded conductor wires are arranged in parallel with each other and perpendicular to the third set of the grounded conductor wires.

Abstract: Disclosed is a method for extracting IP information in a TEM response of a grounded-wire source, comprising the following steps: 1) obtaining subsurface resistivity through inversion of a vertical magnetic field less influenced by an IP effect; 2) obtaining an electric field response not influenced by the IP effect based on forward modeling of the obtained underground electrical structure; 3) removing the influence of the IP effect on an observed response to obtain a pure IP response; and 4) inverting the obtained IP response to obtain IP information of polarizability, a frequency dependence, and a time constant. The method of the present invention provides a new idea for further extracting IP information in a TEM response.

Abstract: A system for emulating a plurality of wireless communication channels is provided. The system includes a plurality of elevation steering devices configured to modify at least one elevation characteristic of a plurality of signals and a plurality of combiners. Each combiner is configured to combine at least two signals of the plurality of signals to output a combined signal. The plurality of combiners output a plurality of combined signals. The system includes a plurality of azimuth steering devices configured to modify at least one azimuth characteristic of the plurality of combined signals. The plurality of elevation steering devices and the plurality of azimuth steering devices emulate the plurality of wireless communication channels.

Abstract: The present disclosure discloses a distributed airborne electromagnetic detection system, and relates to an airborne electromagnetic detection technology. The distributed airborne electromagnetic detection system comprises at least one transmitting system, at least one receiving system, at least one trunk module, and an earth station, and also a plurality of Unmanned Aerial Vehicles (UAVs) for carrying the transmitting system, the receiving system, and the trunk module. The distributed airborne electromagnetic detection system does not require high performance or high economical efficiency for a single UAV; under precise synchronous flight conditions, the distance between a type I UAV and a transmitting loop structure can be greatly reduced, thereby significantly reducing the length of unwanted transmitting cable; and in addition, due to the better low-altitude low-speed performance of UAVs, the traveling speed of the entire system can be further reduced, thus obtaining higher quality data.

Abstract: A system for emulating a plurality of wireless communication channels is provided. The system includes a plurality of elevation steering devices configured to modify at least one elevation characteristic of a plurality of signals and a plurality of combiners. Each combiner is configured to combine at least two signals of the plurality of signals to output a combined signal. The plurality of combiners output a plurality of combined signals. The system includes a plurality of azimuth steering devices configured to modify at least one azimuth characteristic of the plurality of combined signals. The plurality of elevation steering devices and the plurality of azimuth steering devices emulate the plurality of wireless communication channels.

Abstract: The disclosure pertains to the field of electromagnetic exploration, and in particular relates to a device and method for ground source transient electromagnetic near-field detection and related device, with the purpose of solving the problems that the method for loop source transient electromagnetic detection has a relatively small detection depth and weak signals. The device of the disclosure includes an excitation source emitting device and a receiving device for signal detection. The excitation source emitting device includes an emission source, the emission source is a grounded conductor wire; the grounded conductor wire is used to convert a bipolar pulsed current into an electromagnetic field to be emitted underground; and the receiving device is configured for detecting a magnetic field and/or electric field signal in a survey line segment of an observation range of the grounded conductor wire using the method of areal sideline scanning survey.

Abstract: A method and system for electromagnetic method (EM) signal detection based on an onshore sparker source, the method including: arranging an EM signal detection system near a sparker source; releasing, by the sparker source, an electromagnetic pulse concomitantly in a discharge and mechanical energy output process; observing an electromagnetic response generated by the earth under the excitation of the electromagnetic pulse by means of the EM signal detection system for extracting distribution information of geo-electrical parameters; when the sparker source moves, moving the electromagnetic method signal detection system to a new position along with the sparker source while keeping their positions relative to each other unchanged; and repeating the above process after the movement is completed. According to the technical solution of the present invention, fine electromagnetic detection results can be obtained while seismic detection is carried out.

Abstract: Disclosed in the present invention is a multi-mode data observation method based on unmanned aerial vehicle formation for semi-airborne electromagnetic surveying. The method includes four basic formation modes: a ZX formation mode for obtaining the Z component of the response field with a high signal-to-noise ratio and the X direction gradient data of the Z component of the response field in different scales; a ZZ formation mode for obtaining the Z direction gradient data of the Z component of the response field in different scales; an XX formation mode for obtaining the X component of the response field with a high signal-to-noise ratio and the X direction gradient data of the X component of the response field in different scales; an XZ formation mode for obtaining the Z direction gradient data of the X component of the response field in different scales.

Abstract: Disclosed in the present invention is a multi-mode data observation method based on unmanned aerial vehicle formation for semi-airborne electromagnetic surveying. The method includes four basic formation modes: a ZX formation mode for obtaining the Z component of the response field with a high signal-to-noise ratio and the X direction gradient data of the Z component of the response field in different scales; a ZZ formation mode for obtaining the Z direction gradient data of the Z component of the response field in different scales; an XX formation mode for obtaining the X component of the response field with a high signal-to-noise ratio and the X direction gradient data of the X component of the response field in different scales; an XZ formation mode for obtaining the Z direction gradient data of the X component of the response field in different scales.

Abstract: Disclosed in the present invention is a method for suppressing airborne transient electromagnetic in-band vibration noise, comprising: dividing the data after current turn-off into two segments according to whether the useful signal is attenuated to the system noise level: the segment A is the useful signal segment, and the segment B is the pure noise segment; limiting the bandwidth of the data of the segment B according to the frequency range of the in-band noise, and labeling the result as BL; training a neural network using the BL, utilizing the well trained neural network to predict the in-band vibration noise contained in the data of the segment A, and labeling the prediction result as PNA; and subtracting the PNA from the data of the segment A to suppress the in-band vibration noise contained in the data of the segment A.

Abstract: The present invention relates to a correction method for transient electromagnetic method-based prediction of water-bearing structure ahead of tunnel wall, which pertains to the technical field of transient electromagnetic sounding method. The correction method includes a method for eliminating effects of transition process in a reception probe and a method of using earth conductivity to eliminate effects of transition process. By using the correction technique, more accurate information about the location, size and shape of the object in front of the tunnel wall can be obtained, which is of great significance to the study of the fine water-bearing geological structure.

Abstract: A WEM-based method for deep resource detection using sky waves refers to the technical field of deep resource detection. The proposed method of deep detection using sky waves improves the traditional “atmospheric-lithosphere” half-space propagation theory into a full-space “sky wave” theory of “ionosphere-atmosphere-rock layer”, that is, the influence of the ionosphere and the displacement current in the air are taken into consideration to obtain a new precise expression of “sky wave” response, which is suitable for full space, slow attenuation and long distance propagation. A receiving device for sky wave signal has been developed. Through theoretical model calculation and actual data measurement, it is known that it is possible to use the sky wave for detection within the scope of China's national territory to realize the high-precision electrical structural exploration within a depth of 10 kilometers and open a new era of artificial source electromagnetic detection.

Abstract: An apparatus for emulating a wireless network is provided. The apparatus includes processing circuitry configured to: generate a random number corresponding to an angle between a boresight of an antenna of a network node and a direction of a first wireless device, generate a random number corresponding to a path loss between the first wireless device and the antenna of the network node, determine network performance of the first wireless device based at least in part on the generated random number corresponding to the angle between the boresight of the antenna of the network node and the direction of the first wireless device and the generated random number corresponding to the path loss between the first wireless device and the antenna of the network node, and determine performance of the wireless network based at least in part on the determined network performance of the first wireless device.

Abstract: An apparatus for emulating a wireless network is provided. The apparatus includes processing circuitry configured to: generate a random number corresponding to an angle between a boresight of an antenna of a network node and a direction of a first wireless device, generate a random number corresponding to a path loss between the first wireless device and the antenna of the network node, determine network performance of the first wireless device based at least in part on the generated random number corresponding to the angle between the boresight of the antenna of the network node and the direction of the first wireless device and the generated random number corresponding to the path loss between the first wireless device and the antenna of the network node, and determine performance of the wireless network based at least in part on the determined network performance of the first wireless device.

Abstract: The disclosure pertains to the field of exploration based on electromagnetic method, and in particular relates to a method and device for surface-borehole transient electromagnetic detection, aiming at solving the problem that the loop source device cannot effectively detect the high-resistance layer. The device according to the disclosure includes grounded conductor wires as emission sources and underground receiving devices as receiving sources; wherein the grounded conductor wires are arranged on the ground; an existing borehole on the ground or an existing underground roadway is used, and receiving probes are arranged point by point in the borehole direction or in the horizontal direction of the roadway; the grounded conductor wires are composed of three sets of grounded conductor wires, wherein two sets of the grounded conductor wires are arranged in parallel with each other and perpendicular to the third set of the grounded conductor wires.

Abstract: The disclosure pertains to the field of electromagnetic exploration, and in particular relates to a device and method for ground source transient electromagnetic near-field detection and related device, with the purpose of solving the problems that the method for loop source transient electromagnetic detection has a relatively small detection depth and weak signals. The device of the disclosure includes an excitation source emitting device and a receiving device for signal detection. The excitation source emitting device includes an emission source, the emission source is a grounded conductor wire; the grounded conductor wire is used to convert a bipolar pulsed current into an electromagnetic field to be emitted underground; and the receiving device is configured for detecting a magnetic field and/or electric field signal in a survey line segment of an observation range of the grounded conductor wire using the method of areal sideline scanning survey.

Abstract: The present invention relates to a correction method for transient electromagnetic method-based prediction of water-bearing structure ahead of tunnel wall, which pertains to the technical field of transient electromagnetic sounding method. The correction method includes a method for eliminating effects of transition process in a reception probe and a method of using earth conductivity to eliminate effects of transition process. By using the correction technique, more accurate information about the location, size and shape of the object in front of the tunnel wall can be obtained, which is of great significance to the study of the fine water-bearing geological structure.

Abstract: A WEM-based method for deep resource detection using sky waves refers to the technical field of deep resource detection. The proposed method of deep detection using sky waves improves the traditional “atmospheric-lithosphere” half-space propagation theory into a full-space “sky wave” theory of “ionosphere-atmosphere-rock layer”, that is, the influence of the ionosphere and the displacement current in the air are taken into consideration to obtain a new precise expression of “sky wave” response, which is suitable for full space, slow attenuation and long distance propagation. A receiving device for sky wave signal has been developed. Through theoretical model calculation and actual data measurement, it is known that it is possible to use the sky wave for detection within the scope of China's national territory to realize the high-precision electrical structural exploration within a depth of 10 kilometers and open a new era of artificial source electromagnetic detection.