Ground electromagnetic receiver and acquisition method for mineral resource exploration

Abstract

The application discloses a ground electromagnetic receiver and a collection method for mineral resource exploration. The interface of the ground electromagnetic receiver is no longer distinguished from a magnetic field sensor and an electric field sensor, but a magnetic field / electric field universal interface is used, automatic identification of the magnetic field sensor or the electric field sensor is realized through a power consumption detection unit, and switching to a corresponding front-end circuit is realized. The ground electromagnetic receiver has the advantages that on one hand, the ground electromagnetic receiver is no longer limited by the number of physical interfaces of the sensors, and the operation difficulty in rivers, hills and the like is reduced; and on the other hand, the utilization rate is low and the power consumption is wasted due to the idle interface. The ground electromagnetic receiver can be combined with multiple receivers according to the terrain, different wiring modes are realized, and the exploration of mineral resources is facilitated.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of mineral resource exploration and detection, and particularly relates to a ground electromagnetic receiver and a ground electromagnetic acquisition method suitable for MT, AMT and CSAMT detection methods. BACKGROUND

[0002] Electromagnetic exploration is one of the effective means of resource exploration, which is widely used in deep structure detection, mineral resource exploration, and hydrology and engineering exploration due to its various types and strong adaptability.

[0003] Magnetotelluric (MT) is the electromagnetic exploration method with the largest detection depth at present, which was proposed and established by Tikhonov and Cagniard in the 1950s, and plays an important role in deep structure detection and natural earthquake prediction.

[0004] Audiofrequency Magnetotelluric (AMT) is a new geophysical exploration method proposed in the early 1950s based on the principle of MT. This method is a geophysical method for studying the distribution of underground rock resistivity by observing the ground electromagnetic field.

[0005] Controlled Source Audiofrequency Magnetotelluric (CSAMT) is a kind of artificial source frequency sounding method developed on the basis of AMT. In the 1950s, based on the paper of L Cagniard, the MT sounding method based on the observation of the orthogonal components of the natural field electric and magnetic fields was developed to calculate the apparent resistivity. In the audio (n×10 -1 ~ n×10 3 Hz) range, the MT field is relatively weak, and human interference is large. In order to overcome the above difficulties, Professor D W Strangway and his student M A Goldstein proposed in the early 1970s to use the measurement method of AMT to observe the audio electromagnetic field generated by artificial power supply. Since the frequency, field strength and direction of the observed electromagnetic field are controlled by artificial, the observation method is the same as that of AMT, so it is called controlled source audio magnetotelluric sounding. CSAMT method can use magnetic source or electric source as artificial field source, and at present, the electric source controlled source audio magnetotelluric sounding method is mainly used.

[0006] Currently, most methods employ dipole arrays for scalar measurements, simultaneously observing the horizontal component of the electric field Ex parallel to the source and the horizontal component of the magnetic field Hy orthogonal to the source. The Carnia impedance resistivity ρs, electric field phase Hp, and magnetic field amplitude are then calculated using the electric field amplitude Ex and the magnetic field amplitude Hy. Calculate the Carnia impedance phase. Combine impedance resistivity and impedance phase inversion to calculate inverted resistivity parameters, which are then used for geological interpretation. In recent years, with the continuous advancement of CSAMT methods and theories, this method has been widely applied in geothermal research, deep mineral exploration, concealed geological structure exploration, and coalfield geological exploration, achieving good results. The key to electromagnetic sounding theory is studying the relationship between the surface electromagnetic field and the resistivity of underground rocks and minerals, which can effectively realize the detection of mineral resources. The surface electromagnetic receiver is a key instrument in this detection process.

[0007] Regarding the design of electromagnetic receivers, existing technologies such as "Shi Xinyu. Development of EMR6-A Multifunctional Electromagnetic Receiver [D]. China University of Geosciences (Beijing), 2019.DOI:10.27493 / d.cnki.gzdzy.2019.001385" and "Zheng Caijun, Liu Xinzhuo, Lin Pinrong et al. Design and Implementation of Distributed Electromagnetic Method Instrument System [J]. Chinese Journal of Geophysics, 2019, 62(10):3772-3784" are recorded. However, the interface design of electromagnetic receivers in existing technologies still adopts an independent design concept, that is, artificially distinguishing between electromagnetic sensor interfaces and magnetic field sensor interfaces.

[0008] Ground-based electromagnetic detection requires the simultaneous measurement of at least one component of the electric field and its orthogonal magnetic field. Traditional MT receivers measure five components: the north-south electric field component Ex, the east-west electric field component Ey, the north-south magnetic field component Hx, the east-west magnetic field component Hy, and the vertical magnetic field component Hz. Figure 1 As shown.

[0009] The electric field signal is measured by two electrodes (electric field sensor, which does not require power from the receiver) forming a pair of differential signals, which are then input into the receiver.

[0010] The magnetic field signal is measured by using a magnetic rod (magnetic field sensor, which requires power from the receiver) to convert the magnetic field signal into a voltage signal, which is input into the receiver in the form of a single-ended signal.

[0011] Given the different input characteristics of electric and magnetic fields, all receivers are designed with different front-end detection circuits.

[0012] To perform measurements of multi-component (usually five-component) electromagnetic field signals, such as Figures 3-4The existing receiver is a whole of five-component signal measurement, and the internal acquisition circuit is designed with independent electric field channels and magnetic field channels. The electric field and magnetic field channels are distinguished on the input panel of the receiver.

[0013] As shown in Figure 2 , the CSAMT measurement mode is to measure the magnetic field in one direction and the multi-component electric field orthogonal to the magnetic field direction. The transmitter needs to generate an artificial source signal during CSAMT measurement, and the transmitter is driven by a diesel generator. The more components measured simultaneously, the lower the operating cost. The five-component receiver can only measure two electric field signal components simultaneously during CSAMT measurement. To measure multiple electric field components simultaneously, the number of receivers required is half the number of measured electric field components. Increasing the number of receiver channels can effectively reduce the number of receivers used.

[0014] From the above analysis, the following problems exist in the use of the current ground electromagnetic receiver:

[0015] First, the electric field and magnetic field channels exist in a fixed physical form (interface form) on the receiver, and the electric field and magnetic field channels are clearly distinguished. The electric field channel needs to be connected to an electric field sensor (electrode), and the magnetic field channel needs to be connected to a magnetic field sensor. After the receiver is manufactured, the number of electric field channels and the number of magnetic field channels are fixed, and a specific interface can only be connected to a specific input.

[0016] Second, due to the limitation of the number of physical interfaces of a single receiver, the adaptability of the instrument to the use environment is limited, and it is difficult to operate in areas with significant elevation differences such as rivers and hills. SUMMARY

[0017] The present application aims to provide a ground electromagnetic receiver and acquisition method for mineral resource exploration, which no longer distinguishes the electric field and magnetic field channels on the receiver in a fixed physical form, realizes an electric field / magnetic field universal interface on the same receiver, and automatically switches through the receiver to reduce the difficulty of wiring, improve the efficiency of measurement wiring, and reduce the difficulty of operation in special detection environments caused by the limitation of the number of physical interfaces.

[0018] The present application is realized by the following technical solutions:

[0019] The ground electromagnetic receiver for mineral resource exploration comprises,

[0020] a digital circuit unit;

[0021] an electric field / magnetic field universal interface, at least one of the electric field / magnetic field universal interfaces is arranged on the panel of the ground electromagnetic receiver;

[0022] The power supply module, one electric field / magnetic field universal interface matches one of the power supply module, and the power supply module is connected with the electric field / magnetic field universal interface through the single-pole single-throw switch, and the control end of the single-pole single-throw switch is connected with the output end of the digital circuit;

[0023] The power consumption detection unit, one electric field / magnetic field universal interface matches one of the power consumption detection unit, and the input end of the power consumption detection unit is connected with the electric field / magnetic field universal interface, the output of the power supply module respectively, and the output end of the power consumption detection unit is connected with the input end of the digital circuit unit;

[0024] The magnetic field front-end detection circuit and the electric field front-end detection circuit, one electric field / magnetic field universal interface matches one of the magnetic field front-end detection circuit and the electric field front-end detection circuit;

[0025] The analog-digital conversion unit, one electric field / magnetic field universal interface matches one of the analog-digital conversion unit, and the output end of the analog-digital conversion unit is connected with the input end of the digital circuit unit;

[0026] The first single-pole double-throw switch, the common end of the first single-pole double-throw switch is connected with the electric field / magnetic field universal interface, the normally closed end of the first single-pole double-throw switch is connected with the input end of any one of the magnetic field front-end detection circuit and the electric field front-end detection circuit, and the input end of the other is connected with the normally open end of the first single-pole double-throw switch, and the control end of the first single-pole double-throw switch is connected with the output end of the digital circuit;

[0027] The second single-pole double-throw switch, the common end of the second single-pole double-throw switch is connected with the input end of the analog-digital conversion unit, the normally closed end of the second single-pole double-throw switch is connected with the output end of any one of the magnetic field front-end detection circuit and the electric field front-end detection circuit, and the output end of the other is connected with the normally open end of the second single-pole double-throw switch, and the control end of the second single-pole double-throw switch is connected with the output end of the digital circuit.

[0028] As an option, the single-pole single-throw switch is a relay.

[0029] The present application aims at the universal interface switching electric field sensor and magnetic field sensor when there are two ways to realize single-pole double-throw switch, one is through analog switch switching, and the other is to use relay switching.

[0030] As an option, the first single-pole double-throw switch and the second single-pole double-throw switch are single-pole double-throw analog switches or relays with conversion contacts.

[0031] For example, when using a relay with conversion contacts, the first moving contact of the relay is connected with the electric field / magnetic field universal interface, the first stationary contact of the relay is connected with the input end of any one of the magnetic field front-end detection circuit and the electric field front-end detection circuit, and the input end of the other is connected with the second stationary contact of the relay;

[0032] The second moving contact of the relay is connected to the input terminal of the A / D conversion unit, the third stationary contact of the relay is connected to the output terminal of any one of the magnetic field front detection circuit and the electric field front detection circuit, and the output terminal of the other is connected to the fourth stationary contact of the relay.

[0033] It should be noted that the relay with the conversion contact can contain only one set of conversion contacts or multiple sets of conversion contacts, which is determined by comprehensively considering factors such as cost, volume, power consumption, and weight.

[0034] As an option, the ground electromagnetic receiver for mineral resource exploration further comprises a temperature sensor, an output terminal of the temperature sensor is connected to an input terminal of the A / D conversion unit, and the temperature collected by the temperature sensor is used to correct the electric field sensor and the magnetic field sensor.

[0035] As an option, the electric field / magnetic field universal interface has three.

[0036] The ground electromagnetic acquisition method for mineral resource exploration is MT / AMT, and a single measurement point position cannot meet the station layout requirements of MT / AMT, two ground electromagnetic receivers with three electric field / magnetic field universal interfaces are arranged at two different measurement point positions, one ground electromagnetic receiver is connected to part of the electric field and magnetic field sensors, and the other ground electromagnetic receiver is connected to the remaining number of electric field and magnetic field sensors.

[0037] As an option, the two different measurement point positions are in an environment with altitude elevation changes, and the three electric field / magnetic field universal interfaces of the ground electromagnetic receiver at the measurement point position with higher elevation are all connected to magnetic field sensors.

[0038] As an option, two of the three electric field / magnetic field universal interfaces of the ground electromagnetic receiver used at one of the two different measurement point positions are connected to electric field sensors.

[0039] As an option, two of the three electric field / magnetic field universal interfaces of the ground electromagnetic receiver used at one of the two different measurement point positions are connected to magnetic field sensors, and one is connected to an electric field sensor.

[0040] As an option, one of the three electric field / magnetic field universal interfaces of the ground electromagnetic receiver used at one of the two different measurement point positions is connected to a magnetic field sensor, and two are connected to electric field sensors.

[0041] The ground electromagnetic acquisition method for mineral resource exploration is CSAMT, comprising the following steps: a plurality of ground electromagnetic receivers are arranged in a measurement array; one of the ground electromagnetic receivers in the measurement array is selected; a magnetic field sensor is connected to one of the three electric field / magnetic field universal interfaces of the selected ground electromagnetic receiver; the other two electric field sensors are connected to the other two electric field / magnetic field universal interfaces of the selected ground electromagnetic receiver; and the three electric field / magnetic field universal interfaces of the remaining ground electromagnetic receivers in the measurement array are all connected to electric field sensors.

[0042] Compared with the prior art, the present application has the following advantages:

[0043] (1) The ground electromagnetic receiver of the present application does not distinguish between electric field and magnetic field channels, and is designed as an electric field / magnetic field universal interface, which is connected to the receiver in the same interface form. On the one hand, the receiver can automatically distinguish whether the connected channel is a magnetic field sensor or an electric field sensor, and on the other hand, the channel type can be set through human-computer interaction (at this time, the digital circuit communicates with the upper computer, and the setting of the ground electromagnetic receiver is realized through the operation interface of the upper computer, i.e. manual real-time setting).

[0044] (2) The independent receiver universal interface design of the present application can reduce the complexity of the connection cable during CSAMT operation, and is more flexible in application, more convenient in application under terrain conditions such as hills and rivers, and relatively light and simple in equipment.

[0045] (3) The independent receiver design of the present application has lower power consumption and prolongs the power supply use time of the receiver. In the use of the traditional ground electromagnetic receiver, the five channels must work at the same time, resulting in the existence of channel empty sampling. Not only is the power consumption high, but also the use time of the receiver is shortened, and the useless data collected by the multiple channels will occupy the data storage space. The design scheme of the present application automatically judges whether to supply power externally, prolongs the power supply use time of the receiver while reducing the power consumption, and only the connected channels will collect data, without recording and storing useless data. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1 is a schematic diagram of MT / AMT five-channel operation using a traditional ground electromagnetic receiver;

[0047] Figure 2 is a schematic diagram of CSAMT operation using a traditional ground electromagnetic receiver;

[0048] Figure 3 is a schematic diagram of the appearance and panel input interface of a traditional ground electromagnetic receiver;

[0049] Figure 4 is a schematic diagram of the internal structure of a traditional ground electromagnetic receiver;

[0050] Figure 5 is the appearance of the ground electromagnetic receiver panel input interface of the present application;

[0051] Figure 6 is the internal structure schematic diagram of the ground electromagnetic receiver of the present application;

[0052] Figure 7 is the schematic diagram of the ground electromagnetic receiver of the present application in MT / AMT five-channel operation;

[0053] Figure 8 is Figure 7 the schematic diagram of the arrangement position of two ground electromagnetic receivers in hilly areas with elevation difference;

[0054] Figure 9 is the schematic diagram of the three electric field / magnetic field general interfaces of the ground electromagnetic receiver arranged in the position of higher elevation measurement point, all of which are used for magnetic field measurement;

[0055] Figure 10 is the schematic diagram of the two electric field / magnetic field general interfaces of the ground electromagnetic receiver arranged in the position of nearby lower elevation measurement point, which are used for electric field measurement;

[0056] Figure 11 is the schematic diagram of the two electric field / magnetic field general interfaces of the ground electromagnetic receiver arranged in the position of nearby lower elevation measurement point, which are used for electric field measurement;

[0057] Figure 12 is the schematic diagram of the two electric field / magnetic field general interfaces of the ground electromagnetic receiver arranged in the position of nearby lower elevation measurement point, which are used for electric field measurement;

[0058] Figure 13 is the schematic diagram of the ground electromagnetic receiver of the present application in CSAMT operation. DETAILED DESCRIPTION

[0059] The present application will be further described below in conjunction with the drawings and specific embodiments, but should not be understood as the scope of the subject matter of the present application is limited to the following embodiments. Any modifications, replacements and changes made according to the ordinary technical knowledge and common practice in the art without departing from the above technical idea of the present application are included in the scope of the present application.

[0060] As Figures 5-6As shown, in this embodiment, a ground electromagnetic receiver with three electric field / magnetic field universal interfaces is taken as an example, which includes a digital circuit unit, three electric field / magnetic field universal interfaces (named as CH1, CH2, CH3 respectively), three power consumption detection units, three magnetic field front-end detection circuits (CH1 front-end circuit 1, CH2 front-end circuit 1, CH3 front-end circuit 1 respectively), three electric field front-end detection circuits (CH1 front-end circuit 2, CH2 front-end circuit 2, CH3 front-end circuit 2 respectively), three analog-to-digital conversion units (ADC1, ADC2, ADC3 respectively), three power supply modules, six single-pole double-throw analog switches or six relays with switching contacts to realize single-pole double-throw switch function (SPDT1, SPDT2, SPDT3, SPDT4, SPDT5, SPDT6 respectively) and three relays to realize single-pole single-throw switch function (SPST1, SPST2, SPST3 respectively).

[0061] The three electric field / magnetic field universal interfaces CH1, CH2 and CH3 are arranged on the panel of the ground electromagnetic receiver, as shown. Figure 5

[0062] Each electric field / magnetic field universal interface is matched with a power consumption detection unit (for example, INA237 precision power monitor of Texas Instruments), and the input end of the power consumption detection unit is connected with the electric field / magnetic field universal interface and the output of the power supply module, and the output end of the power consumption detection unit is connected with the input end of the digital circuit unit.

[0063] One electric field / magnetic field universal interface is matched with one magnetic field front-end detection circuit and one electric field front-end detection circuit, for example, the electric field / magnetic field universal interface CH1 is matched with one magnetic field front-end detection circuit (CH1 front-end circuit 1) and one electric field front-end detection circuit (CH1 front-end circuit 2).

[0064] One electric field / magnetic field universal interface is matched with one analog-to-digital conversion unit, and the output end of the analog-to-digital conversion unit is connected with the input end of the digital circuit unit, for example, the electric field / magnetic field universal interface CH1 is matched with the analog-to-digital conversion unit ADC1.

[0065] One electric field / magnetic field universal interface is matched with one power supply module, and the power supply module is connected with the electric field / magnetic field universal interface through a relay (for example, AGN210A03 of Panasonic Electric Company), and the control end of the relay is connected with the output end of the digital circuit, for example, the electric field / magnetic field universal interface CH1 is connected through the relay to realize the switch function of SPST1, and the opening and closing of the relay is realized by controlling the coil thereof.

[0066] ​The common terminals of the three single-pole double-throw analog switches (SPDT1, SPDT3, SPDT5) matched with the electric field / magnetic field universal interface (CH1, CH2, CH3) are connected with the three electric field / magnetic field universal interfaces (CH1, CH2, CH3) respectively, the normally closed terminals of the single-pole double-throw analog switches (SPDT1, SPDT3, SPDT5) are connected with the input terminals of the three magnetic field front-end detection circuits (CH1 front-end circuit 1, CH2 front-end circuit 1, CH3 front-end circuit 1) respectively, the normally open terminals of the single-pole double-throw analog switches (SPDT1, SPDT3, SPDT5) are connected with the input terminals of the three electric field front-end detection circuits (CH1 front-end circuit 2, CH2 front-end circuit 2, CH3 front-end circuit 2) respectively, and the control terminals (for example, pin A is the control terminal when SN74LVC2G53 of Texas Instruments is selected) of the single-pole double-throw analog switches (SPDT1, SPDT3, SPDT5) are connected with the output terminals of the digital circuit.

[0067] The common terminals of the three single-pole double-throw analog switches (SPDT2, SPDT4, SPDT6) matched with the analog-to-digital conversion unit are connected with the input terminals of the three analog-to-digital conversion units (ADC1, ADC2, ADC3) respectively, the normally closed terminals of the single-pole double-throw analog switches (SPDT2, SPDT4, SPDT6) are connected with the output terminals of the three magnetic field front-end detection circuits (CH1 front-end circuit 1, CH2 front-end circuit 1, CH3 front-end circuit 1) respectively, the normally open terminals of the single-pole double-throw analog switches (SPDT2, SPDT4, SPDT6) are connected with the output terminals of the three electric field front-end detection circuits (CH1 front-end circuit 2, CH2 front-end circuit 2, CH3 front-end circuit 2) respectively, and the control terminals (for example, pin A is the control terminal when SN74LVC2G53 of Texas Instruments is selected) of the single-pole double-throw analog switches (SPDT2, SPDT4, SPDT6) are connected with the output terminals of the digital circuit.

[0068] The ground electromagnetic receiver in the embodiment is three-channel, and the input interface does not distinguish electric field and magnetic field input. Whether there is power consumption is used to judge whether the accessed sensor is an electric field sensor or a magnetic field sensor, and the internal switch is switched to the corresponding electric field or magnetic field front-end circuit. When performing MT measurement, two ground electromagnetic receivers are combined. When performing CSAMT measurement, any multiple ground electromagnetic receivers can be combined. Each channel of the combined multiple receivers is effectively connected, avoiding the fact that some channels are not connected when doing CSAMT due to the receiver interface (connector) and input channel speciality.

[0069] The ground electromagnetic receiver panel uses only three interfaces (connectors): CH1, CH2, and CH3. These three interfaces connect to the receiver's internal electronic circuitry. The interfaces are compatible with both magnetic field sensors (which consume power) and electric field sensors (which do not consume power). The three channels operate in the same way; the following description will focus on channel 1 (CH1).

[0070] After the receiver starts up, relay (SPST1) closes. The power consumption detection circuit determines whether a magnetic field sensor or an electric field sensor is currently connected. If a magnetic field sensor is connected, the power supply module provides external power. If an electric field sensor is connected, relay (SPST1) opens, the power supply module does not provide external power, and the corresponding power supply module is inactive. The power consumption detection circuit controls single-pole double-throw analog switches SPDT1 and SPDT2 to select different front-end circuits. If a magnetic field sensor is connected, it switches to CH1 front-end circuit 1, the corresponding magnetic field front-end detection circuit; if an electric field sensor is connected, it switches to CH1 front-end circuit 2, the corresponding electric field detection front-end circuit. The power supply module supplies power to the entire channel module; when the entire channel module is inactive, system power consumption is reduced. When the receiver user wants to supply power externally through the target channel, the corresponding power supply module can be activated, and the corresponding SPST1 can be closed to supply power.

[0071] When the measuring point is located in, for example Figure 8 In environments with varying altitudes, the electric field measurement components may not meet the deployment requirements of MT / AMT. In such cases, the two ground electromagnetic receivers can be deployed separately, such as... Figure 7 and Figure 9 One receiver is used to connect some electric and magnetic field sensors, and the other is used to connect other electric and magnetic field sensors, making the receiver application more flexible.

[0072] Different input combinations can be configured for the bottom-mounted electromagnetic receiver to suit different terrains and application requirements. Figures 9-12 These are schematic diagrams of different combinations.

[0073] For example, in hilly areas or on slopes where it is difficult to set up an electric field, one receiver can be selected to be positioned on the hills or slopes according to... Figure 9 The three-component magnetic field is arranged in a manner similar to that used in other methods. A location with favorable terrain is selected nearby, and two electric field channels are arranged using a separate receiver. Figure 10 As shown.

[0074] For example Figure 11As shown, two receivers are used to collect signals in combination when a single receiver at the same measuring point cannot meet the requirements of station arrangement, and the two receivers are arranged at two different measuring point positions, one of the receivers is used for collecting signals of one electric field channel and two magnetic field channels, and the remaining components are realized by using the other receiver.

[0075] For example Figure 12 As shown, two receivers are used to collect signals in combination when a single receiver at the same measuring point cannot meet the requirements of station arrangement, and the two receivers are arranged at two different measuring point positions, one of the receivers is used for collecting signals of one electric field channel and two magnetic field channels, and the remaining components are realized by using the other receiver.

[0076] For example Figure 13 In the application of CSAMT, three (or more) receivers can be used simultaneously to constitute a measuring arrangement, the receiver at the center position can use the CH2 channel to connect the magnetic field sensor, and the CH1 and CH3 channels to connect the electric field sensor, and the three channels (electric field / magnetic field universal interface CH1, CH2 and CH3) of the other receivers can all be connected to the electric field sensor, so that all channels of the receiver can be effectively applied, and the channel utilization rate of the receiver is improved.

[0077] Of course, the receiver of the present application can also be used in combination at the same measuring point position, one of the receivers accesses three magnetic field channels, and the other receiver accesses two electric field channels, and the remaining one channel is closed.

Claims

1. A ground electromagnetic receiver for mineral resource exploration, characterized in that: comprising a digital circuit unit; a plurality of electric / magnetic field universal interfaces, at least one of which is arranged on a panel of the ground electromagnetic receiver; a plurality of power supply modules, one of which is matched with one of the electric / magnetic field universal interfaces, and the power supply module is connected with the electric / magnetic field universal interface through a single-pole single-throw switch, a control end of the single-pole single-throw switch being connected with an output end of the digital circuit; a plurality of power consumption detection units, one of which is matched with one of the electric / magnetic field universal interfaces, and an input end of the power consumption detection unit is connected with an output end of the electric / magnetic field universal interface and the power supply module, and an output end of the power consumption detection unit is connected with an input end of the digital circuit unit; a plurality of magnetic field front-end detection circuits and electric field front-end detection circuits, one of which is matched with one of the electric / magnetic field universal interfaces; an analog-to-digital conversion unit, one of which is matched with one of the electric / magnetic field universal interfaces, and an output end of the analog-to-digital conversion unit is connected with an input end of the digital circuit unit; a first single-pole double-throw switch, a common end of the first single-pole double-throw switch being connected with the electric / magnetic field universal interface, a normally closed end of the first single-pole double-throw switch being connected with an input end of any one of the magnetic field front-end detection circuit and the electric field front-end detection circuit, and an input end of the other is connected with a normally open end of the first single-pole double-throw switch, and a control end of the first single-pole double-throw switch is connected with an output end of the digital circuit; a second single-pole double-throw switch, a common end of the second single-pole double-throw switch being connected with an input end of the analog-to-digital conversion unit, a normally closed end of the second single-pole double-throw switch being connected with an output end of any one of the magnetic field front-end detection circuit and the electric field front-end detection circuit, and an output end of the other is connected with a normally open end of the second single-pole double-throw switch, and a control end of the second single-pole double-throw switch is connected with an output end of the digital circuit.

2. The ground electromagnetic receiver for mineral resource exploration according to claim 1, wherein: the single-pole single-throw switch is a relay; the first single-pole double-throw switch and the second single-pole double-throw switch are single-pole double-throw analog switches or relays with conversion contacts.

3. The ground-based electromagnetic receiver for mineral resource exploration of claim 1, wherein: a temperature sensor is further included, and an output end of the temperature sensor is connected with an input end of the analog-to-digital conversion unit.

4. The ground-based electromagnetic receiver for mineral resource exploration of claim 1, wherein: the electric / magnetic field universal interface is three.

5. A ground electromagnetic acquisition method for mineral resource exploration, the ground electromagnetic acquisition method being MT / AMT, and a single measurement point position cannot meet the station arrangement requirement of MT / AMT, wherein: two ground electromagnetic receivers according to claim 4 are arranged at two different measurement point positions respectively, one of the ground electromagnetic receivers is connected with part of electric field and magnetic field sensors, and the other ground electromagnetic receiver is connected with the remaining electric field and magnetic field sensors.

6. The method for ground electromagnetic acquisition for mineral resource exploration according to claim 5, characterized in that: the two different measurement point positions are in an environment with altitude elevation variation, and the three electric / magnetic field universal interfaces of the ground electromagnetic receiver at the measurement point position with higher elevation are all connected with magnetic field sensors.

7. The method for ground electromagnetic acquisition for mineral resource exploration according to claim 5, characterized in that: two of the three electric / magnetic field universal interfaces of the ground electromagnetic receiver arranged at one of the two different measurement point positions are connected with electric field sensors.

8. The method for ground electromagnetic acquisition for mineral resource exploration according to claim 5, characterized in that: In the three electric field / magnetic field universal interfaces of the ground electromagnetic receiver used in one of the two different measuring point positions, two are connected with magnetic field sensors and one is connected with an electric field sensor.

9. The method for ground electromagnetic acquisition for mineral resource exploration according to claim 5, characterized in that: In the three electric field / magnetic field universal interfaces of the ground electromagnetic receiver used in one of the two different measuring point positions, one is connected with a magnetic field sensor and two are connected with electric field sensors.

10. A method of ground electromagnetic acquisition for mineral resource exploration, the method of ground electromagnetic acquisition being CSAMT, characterized in that: Comprising, The measuring arrangement is composed of two or more ground electromagnetic receivers according to claim 4, and one of the ground electromagnetic receivers in the measuring arrangement is selected, in which one of the three electric field / magnetic field universal interfaces is connected with a magnetic field sensor and the other two are connected with electric field sensors, and the three electric field / magnetic field universal interfaces of the remaining ground electromagnetic receivers in the measuring arrangement are all connected with electric field sensors.

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