Movable superaudio frequency rapid electromagnetic exploration equipment and method based on AM frequency modulation station

Abstract

The invention provides movable superaudio rapid electromagnetic exploration equipment and method based on an AM frequency modulation station. A carrying vehicle pulls a dragging device equipped with a superaudio controllable source electromagnetic receiver; superaudio magnetotelluric detection is carried out on the moving route of the carrier loader within the range of signals of the AM frequency modulation station, very-low-frequency electromagnetic waves emitted by the navy VLF radio station and electromagnetic signals emitted by the national time service center; controlling a receiver to collect electromagnetic signals in the area; and when the receiver carries out signal acquisition, the received data are recorded and stored in real time. According to the method, a special transmitter is not needed to transmit signals, so that the exploration efficiency can be greatly improved; according to the invention, an AM frequency modulation station signal, a very low frequency electromagnetic wave emitted by a navy VLF radio station and an electromagnetic signal emitted by a national time service center can be used as a signal source for magnetotelluric detection to detect an underground structure, and the requirement of fine electromagnetic detection of middle and shallow layers can be met.

Description

Technical Field

[0001] The invention provides a movable super-frequency fast electromagnetic exploration equipment and method based on an AM frequency modulation station, belonging to the technical field of geophysical electromagnetic exploration. Background Art

[0002] Most of the existing electromagnetic exploration methods require special launch equipment and operators, which are costly, have small exploration range, and low efficiency. The existing electromagnetic exploration instruments with comprehensive detection functions in the international market include the GDP-32Ⅱ multifunctional electrical method system of the American Zonge Company, the V8 electromagnetic system of the Canadian Phoenix Company, the ADU-07 comprehensive electromagnetic system launched by the German Metronix Company, and the Stratagem EH5 electromagnetic system of the American Geometrics Company. These devices are relatively advanced in technology and relatively complete in function, occupying almost 95% of the market of electromagnetic instruments in my country, and the frequency range indicators do not exceed 512kHz, which is difficult to meet the needs of refined electromagnetic exploration in medium and shallow layers. Summary of the invention

[0003] The present invention aims to provide a movable super-audio frequency rapid electromagnetic exploration method and equipment based on an AM frequency modulation station to solve the above problems.

[0004] The present invention proposes a movable super-audio frequency rapid electromagnetic exploration equipment and method based on an AM frequency modulation station, including a super-audio frequency controllable source electromagnetic receiver. The receiver can use the AM frequency modulation station signal, the very low frequency electromagnetic wave emitted by the navy VLF radio station, and the electromagnetic signal emitted by the National Time Service Center as the signal source for ground electromagnetic detection. The highest frequency of the signal detected by the receiver reaches 1250kHz, and the lowest operating frequency reaches 1Hz.

[0005] A movable super-frequency rapid electromagnetic exploration method based on an AM frequency modulation station includes the following processes: a carrier vehicle pulls a towing device equipped with a super-frequency controllable source electromagnetic receiver; ensuring that the moving route of the carrier vehicle is within the range of the AM frequency modulation station signal, the very low frequency electromagnetic wave emitted by the navy VLF radio station, and the electromagnetic signal emitted by the National Time Service Center to conduct super-frequency magnetotelluric detection; controlling the electromagnetic signal within the receiver collection area; and when the receiver is collecting signals, real-time recording and storage of received data.

[0006] A mobile super-audio frequency rapid electromagnetic exploration equipment based on an AM frequency modulation station includes a carrier vehicle equipped with a super-audio frequency controllable source electromagnetic receiver; the super-audio frequency controllable source electromagnetic receiver is mainly composed of an interface board, an analog board, a connection board, and a main control board. The interface board is a bridge between the inside and outside of the instrument, and integrates a sensor interface, a power interface, a communication interface, an indicator light interface, and a button interface. The sensor interface is divided into a magnetic field sensor interface and an electrode terminal, and its connection is connected to the analog channel input terminal on the analog board. The power interface is responsible for inputting an external 12V power supply and powering the entire system through a power distribution network. The communication interface, indicator lights, and buttons are responsible for the human-machine interaction function, and their internal wiring is connected to the MPSoC (Multiprocessor System-on-Chip) on the main control board. In addition, the interface board also has functions such as overcurrent reverse connection protection and power monitoring. The digital interface of the power monitoring chip and the power control chip on the interface board are also connected to the MPSoC on the main control board. The analog board has 5 analog channels, which are responsible for conditioning and analog-to-digital conversion of analog signals of 2 electric field components and 3 magnetic field components. The signal conditioning circuit mainly includes input protection, program-controlled amplification, analog filtering, single-ended to differential circuits, etc. The analog-to-digital conversion circuit includes the AD7760 analog-to-digital converter and its peripheral circuits, and its digital interface is connected to the MPSoC on the main control board through a connecting board. AD7760 can output 24-bit sampling data at a maximum frequency of 2.5MSPS. There is a magnetic coupling isolation module on the connecting board, which is connected to the digital signal ports of the analog board and the main control board respectively, responsible for isolating the digital part from the analog part, and disconnecting the electrical connection to reduce the interference of the digital part on the analog signal. The analog-to-digital conversion data enters the main control board through the connecting board. The main control board uses the MPSoC model ZU3EG as the main control chip, which is divided into two parts, ARM and FPGA, with different division of labor. The FPGA part is mainly responsible for controlling the analog board to perform analog-to-digital conversion, receiving and analyzing conversion data, receiving and analyzing GPS data, calibrating the constant temperature crystal oscillator, and managing the system power supply. The ARM part is mainly responsible for the process control, human-computer interaction, data storage and other functions of the entire acquisition station. The ARM part communicates with the FPGA part through the AXI bus inside the chip, and configures the acquisition parameters and controls the start and stop of acquisition by reading and writing FPGA registers. The analog-to-digital conversion data is analyzed by the FPGA part and transmitted to the ARM part in the form of a data stream. The ARM part stores it in an external solid-state drive and transmits it to the host computer in real time through Ethernet. The ARM part is also responsible for processing related functions such as buttons and LEDs.

[0007] The portable super-audio frequency rapid electromagnetic exploration equipment and method based on AM frequency modulation station provided by the present invention does not need a special transmitter to transmit signals, which can greatly improve the exploration efficiency; the present invention can use AM frequency modulation station signals, very low frequency electromagnetic waves transmitted by the navy VLF radio station, and electromagnetic signals transmitted by the National Time Service Center as signal sources for magnetotelluric detection to detect underground structures, which can meet the needs of adapting to the refined electromagnetic detection of medium and shallow layers.

[0008] The present invention can also utilize the very low frequency electromagnetic waves emitted by existing naval VLF radio stations of various countries around the world and the electromagnetic signals emitted by the National Time Service Center to detect underground structures, and can achieve rapid electromagnetic exploration of underground structures within a larger signal coverage range. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 The present invention provides a portable super-audio frequency rapid electromagnetic exploration method and equipment based on an AM frequency modulation station;

[0010] Figure 2 It is the overall hardware structure block diagram of the super-audio controllable source electromagnetic receiver of the present invention;

[0011] Figure 3 This is a physical picture of the engineering prototype of the super-audio controlled source electromagnetic receiver described in the present invention. DETAILED DESCRIPTION

[0012] The present invention proposes a portable supersonic frequency rapid electromagnetic exploration equipment based on an AM frequency modulation station, as shown in the schematic diagram Figure 1 As shown, the system includes a super-frequency controllable source electromagnetic receiver and a carrier equipped with a towing device, the towing device of the carrier is equipped with a super-frequency controllable source electromagnetic receiver, ensuring that the moving route of the carrier is within the signal range of the AM frequency modulation station to perform super-frequency magnetotelluric detection; control the electromagnetic signal in the receiver collection area; when the receiver performs signal collection, the received data is recorded and stored in real time. The present invention can also use the very low frequency electromagnetic waves emitted by the existing naval VLF radio stations of various countries in the world and the electromagnetic signals emitted by the national time service center to detect underground structures, and can realize rapid electromagnetic exploration of underground structures within a larger signal coverage range, without the need for a special transmitter to transmit signals, which can greatly improve the exploration efficiency.

[0013] The mobile super-frequency rapid electromagnetic exploration equipment based on AM frequency modulation station includes a carrier, which pulls a towing device equipped with a super-frequency controllable source electromagnetic receiver; the super-frequency controllable source electromagnetic receiver is mainly composed of an interface board, an analog board, a connection board, and a main control board. The overall hardware structure diagram is as follows Figure 2As shown. The receiver mainly includes the main control board, the connection board, the analog board, and the interface board. The main control board uses the MPSoC model ZU3EG as the main control chip, which is divided into two parts: ARM and FPGA. The FPGA part is mainly responsible for controlling the analog board to perform analog-to-digital conversion, receiving and parsing conversion data, receiving and parsing GPS data, calibrating the constant temperature crystal oscillator, and managing the system power supply. The ARM part is mainly responsible for the process control, human-computer interaction, data storage and other functions of the entire acquisition station. The connection board contains a magnetic coupling isolation module, which is connected to the digital signal ports of the analog board and the main control board respectively, and is responsible for isolating the digital part from the analog part, and disconnecting the electrical connection to reduce the interference of the digital part on the analog signal. The analog-to-digital conversion data enters the main control board through the connection board. The analog board has 5 analog channels, which are responsible for conditioning and analog-to-digital conversion of analog signals of 2 electric field components and 3 magnetic field components. The interface board integrates sensor interface, power interface, communication interface, indicator light interface and button interface. It has the functions of human-computer interaction, and its internal wiring is connected to the MPSoC (Multiprocessor System-on-Chip) on the main control board. Figure 3 This is a physical picture of the engineering prototype of the super-audio controlled source electromagnetic receiver.

[0014] The mobile super-frequency rapid electromagnetic exploration method based on AM FM station includes the following processes: a carrier vehicle pulls a towing device equipped with a super-frequency controllable source electromagnetic receiver; ensures that the moving route of the carrier vehicle is within the signal range of the AM FM station signal, the very low frequency electromagnetic waves emitted by the Navy VLF radio station, and the electromagnetic signal emitted by the National Time Service Center to conduct super-frequency magnetotelluric detection; controls the electromagnetic signals in the receiver collection area; and when the receiver is collecting signals, records and stores the received data in real time.

Claims

1. A portable super-frequency rapid electromagnetic exploration equipment based on an AM frequency modulation station, characterized in that: It includes a carrier vehicle, which pulls a towing device equipped with a super-audio controllable source electromagnetic receiver; the super-audio controllable source electromagnetic receiver includes an interface board, an analog board, a connection board, and a main control board; The interface board is the bridge between the inside and outside of the equipment, integrating the sensor interface, power interface, communication interface, indicator light interface and button interface; The sensor interface is divided into a magnetic field sensor interface and an electrode terminal, and its connection line is connected to the analog channel input terminal on the analog board; The power interface is responsible for inputting external 12V power and supplying power to the entire system through the power distribution network; The communication interface, indicator lights and buttons are responsible for the human-machine interaction function, and their internal wiring is connected to the MPSoC on the main control board; The digital interfaces of the power monitoring chip and power control chip on the interface board are also connected to the MPSoC on the main control board; The analog board has 5 analog channels, which are responsible for conditioning and analog-to-digital conversion of analog signals of 2 electric field components and 3 magnetic field components; the signal conditioning circuit includes input protection, program-controlled amplification, analog filtering, and single-ended to differential circuit; The analog-to-digital conversion circuit includes the AD7760 analog-to-digital converter and its peripheral circuits, and its digital interface is connected to the MPSoC on the main control board through a connection board; the AD7760 can output 24-bit precision sampling data at a maximum frequency of 2.5MSPS; There is a magnetic coupling isolation module on the connection board, which is connected to the digital signal ports of the analog board and the main control board respectively. It is responsible for isolating the digital part from the analog part and cutting off the electrical connection to reduce the interference of the digital part on the analog signal. The analog-to-digital conversion data enters the main control board through the connection board; The main control board uses MPSoC model ZU3EG as the main control chip, which is divided into two parts: ARM and FPGA. The FPGA part is responsible for controlling the analog board to perform analog-to-digital conversion, receiving and analyzing conversion data, receiving and analyzing GPS data, calibrating the constant temperature crystal oscillator, and managing the system power supply function; the ARM part is responsible for the process control, human-computer interaction, and data storage functions of the entire acquisition station; the ARM part communicates with the FPGA part through the AXI bus inside the chip, and configures the acquisition parameters and controls the acquisition start and stop functions by reading and writing FPGA registers; the analog-to-digital conversion data is analyzed by the FPGA part and transmitted to the ARM part in the form of a data stream, which is stored by the ARM part in an external solid-state hard drive and transmitted to the host computer in real time via Ethernet; the ARM part is also responsible for processing button and LED related functions.

2. The portable super-audio frequency rapid electromagnetic exploration equipment based on AM frequency modulation station according to claim 1 is characterized in that: The interface board also has over-current reverse connection protection and power monitoring functions.

3. A portable super-audio frequency rapid electromagnetic exploration method based on an AM frequency modulation station, characterized in that: The portable super-audio frequency rapid electromagnetic exploration equipment based on the AM frequency modulation station according to claim 1 or 2 is used, and the method comprises the following process: The carrier vehicle pulls the towing device equipped with the super-audio controllable source electromagnetic receiver; ensure that the moving route of the carrier vehicle is within the range of the AM FM station's signal, the very low frequency electromagnetic waves emitted by the Navy's VLF radio station, and the electromagnetic signal emitted by the National Time Service Center to conduct super-audio magnetotelluric detection; control the electromagnetic signals within the receiver collection area; and when the receiver is collecting signals, record and store the received data in real time.

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