An arrayed electromagnetic detection transmission synthetic excitation system and method

Abstract

The application discloses an array type electromagnetic detection transmitting and synthesizing excitation system and method, wherein the electromagnetic detection transmitting and synthesizing excitation system comprises: a transmitting coil module, a plurality of transmitting coils are arranged in a square, a circle or other structures at a certain interval; a transmitting control module, according to detection requirements and environmental conditions, dynamically adjusting the parameters of the transmitting current, and controlling the working state of the transmitting coil module; a time reference synchronization module, receiving the time and position signals provided by the satellite, calibrating the clock and position through the satellite positioning signal, realizing the synchronous transmission of the multiple coils; the time reference synchronization module sends the satellite time and position signals to the transmitting control module; the transmitting control module generates the transmitting instruction according to the time reference, and sends the transmitting instruction to each transmitting coil module; each transmitting coil module sends the current pulse according to the received transmitting instruction, and generates a stable electromagnetic field. The application can realize the flexible arrangement mode of unmanned aerial vehicles or single person carrying.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic launch technology, and in particular to an array-type electromagnetic detection and launch synthetic excitation system and method. Background Technology

[0002] In geophysical exploration, electromagnetic induction is commonly used to detect underground resources. By deploying transmitting and receiving coils on the ground, a pulsed current is passed through the transmitting coil, generating a changing electromagnetic field. When this electromagnetic field penetrates the earth, it creates a secondary induced magnetic field underground. Underground conductors (such as mineral deposits or aquifers) respond to this induced field, generating a secondary induced current. The receiving coil receives this secondary induced current on the surface, analyzes its characteristics, and thus infers the distribution of underground resources.

[0003] Existing electromagnetic detection technologies mostly employ a single large-area transmitting coil for electromagnetic transmission. However, large-area coils are difficult to adapt to complex terrains, and their deployment costs are high and operations are complex. By using multiple small coils in combination for transmission, a synthetic magnetic moment can be achieved to simulate the transmission effect of a large-area coil, thereby improving the flexibility and efficiency of the detection system. Summary of the Invention

[0004] The purpose of this invention is to provide an array-type electromagnetic detection and emission synthesis excitation system and method, which enables multiple coils to be adjusted according to different terrain conditions, ensuring synchronous emission and improving the stability of magnetic field generation.

[0005] Technical solution: An array-type electromagnetic detection and emission synthesis excitation system, comprising:

[0006] A transmitting coil module consists of multiple transmitting coils arranged at a certain interval in a square, circular or other structure, used to transmit electromagnetic signals;

[0007] The transmission control module dynamically adjusts the parameters of the transmission current and controls the working state of the transmission coil module according to the detection requirements and environmental conditions.

[0008] The time reference synchronization module receives time and position signals provided by the satellite, calibrates the clock and position using satellite positioning signals, and enables synchronous transmission of multiple coils.

[0009] The time reference synchronization module sends the satellite time signal and position signal to the launch control module; the launch control module generates a launch command based on the time reference and sends it to each launch coil module; each launch coil module simultaneously emits current pulses to generate a stable electromagnetic field based on the received launch command.

[0010] Furthermore, each transmitting coil module is equipped with an independent controller, which controls the current pulses within the transmitting coil module, including the current amplitude and frequency; each controller maintains a local clock via a crystal oscillator and receives a time reference signal from the time reference synchronization module to periodically calibrate the crystal oscillator clock.

[0011] Furthermore, the arrangement of the transmitting coil module is adjustable.

[0012] The implementation method of any of the above-mentioned array-type electromagnetic detection and emission synthesis excitation systems includes the following steps:

[0013] S1. Number the transmitting coil and perform a position self-check using the satellite positioning system to confirm whether positioning has been completed;

[0014] S2, the satellite positioning system publishes coordinate information to each launch control module, and the launch control module arranges the launch coil modules in an array according to the coordinate information. The satellite positioning system then checks whether the arrangement is successful.

[0015] S3, after each transmitting coil module is ready, it waits for the transmission command to be issued; the transmission control module receives the time base signal generated by the time base synchronization module and realizes time synchronization through a high-precision crystal oscillator; the transmitting coil module simultaneously emits current pulses according to the transmission command to generate a stable electromagnetic field;

[0016] S4. After the launch is completed, the position of the transmitting coil module is updated again, adjusted to the next detection position, and after traversing all detection positions, a return signal is sent, and the process ends.

[0017] Furthermore, after the satellite positioning system performs time synchronization correction at time t0, it sets the current to turn on at the Nth pulse and turn off at the Mth pulse by counting the clock pulses output by the crystal oscillator, where M > N.

[0018] Compared with the prior art, the significant advantages of this invention are as follows:

[0019] 1. This invention uses multiple small coils, and the arrangement and parameters of the transmitting coils can be adjusted according to different terrain conditions, including the amplitude, frequency, and waveform shape of the transmitting current, to simulate the transmitting effect of a large coil. It can adapt to complex surface structures and has greater flexibility in deployment. If one of the small coils fails, it will not have a fatal impact on the overall detection and is easier to repair and replace.

[0020] 2. Utilize the time reference signal provided by the satellite system to ensure high-precision time synchronization, achieve synchronous transmission of multiple coils, and improve the stability of magnetic field generation; based on time synchronization, combine position information to realize dynamic array layout planning of the transmitting coils. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of an array-type electromagnetic detection and transmission synthetic excitation system.

[0022] Figure 2 This is a flowchart of the process for an array-type electromagnetic detection and emission synthetic excitation system.

[0023] Figure 3 A schematic diagram of the magnetic field generated by a square arrangement of coils;

[0024] Figure 4 This is a waveform diagram of the synchronous emission current from multiple coils. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0026] like Figure 1 As shown, the array-type electromagnetic detection and emission synthesis excitation system mainly includes the following parts:

[0027] The transmitting coil module consists of multiple coils arranged together, which can be in a straight line, square, or circular structure. Each coil is supplied with a current pulse to create an electromagnetic field.

[0028] The transmission control module is equipped with an independent controller for each transmission coil module. The controller controls the current pulses within the transmission coil module, including the current amplitude and frequency. Each controller maintains a local clock through a high-precision crystal oscillator and receives a time reference signal from the time reference synchronization module to periodically calibrate the crystal oscillator clock, ensuring synchronization of the transmission start time of each transmission coil module.

[0029] The time reference synchronization module receives high-precision time signals from satellites such as BeiDou or GPS, generates a unified time reference signal for the system, and distributes it to the transmission control module. The crystal oscillator in the transmission control module receives and calibrates according to the time reference signal. The time reference signal ensures the synchronization of all coils and guarantees the stability of the magnetic field. The satellite receiver also receives position information for determining the coordinates of the transmission coil modules.

[0030] In array-type electromagnetic detection and transmission systems, the synchronized operation of multiple coils is crucial for generating a stable magnetic field. The system utilizes a unified time reference provided by satellite positioning systems such as BeiDou or GPS, combined with high-precision crystal oscillators to maintain the stability of the local crystal clocks in each controller, thereby achieving synchronized transmission from multiple coils. The introduction of satellite time signals solves the drift problem that may occur in local crystal clocks due to long-term operation, while high-precision crystal oscillators ensure stability over short periods.

[0031] Once all controllers have adjusted according to the time reference signal, the current in the coil will change synchronously, thus ensuring the synchronous generation of the magnetic field.

[0032] The formula for calculating the magnetic moment M generated by a single coil is:

[0033] M = N·I·A (1)

[0034] Where N is the number of turns in the coil, I is the current in the coil, and A is the area of ​​the coil.

[0035] When multiple coils are arranged in a specific pattern, their combined magnetic moment is the vector superposition of the magnetic moments of each coil. Multiple small coils can be arranged in a straight line, square, circular, or other patterns, and the arrangement of the coils determines the distribution and intensity of the magnetic field.

[0036] When multiple coils are arranged in a straight line, the resultant magnetic moment is the direct vector superposition of the magnetic moments of each coil. Assuming there are n coils, the total magnetic moment is:

[0037]

[0038] Among them, M i It is the magnetic moment of the i-th coil, r i f(r) is the distance from the i-th coil to the observation point. i ) is related to the distance r i The decay function is generally... This indicates that the magnetic field decreases in inverse cubic proportion to the distance. If all coils have the same magnetic moment and are spaced uniformly, with a distance d between each coil, then the total magnetic moment can be expressed as:

[0039]

[0040] For n coils arranged in a square, the resultant magnetic moment is the vector superposition of the magnetic moments of each coil. Establish a coordinate system with the center point as the origin, and the position of each coil is (x...). i ,y i If the resultant magnetic moment is at the resultant point (x,y), then the expression for the resultant magnetic moment is:

[0041]

[0042] Among them, M i It is the magnetic moment of each coil.

[0043] Equation (4) shows that as the coil distance increases, the resultant magnetic moment of the outer coil about the center point decreases by the cube of the distance.

[0044] In a circular arrangement, all coils are uniformly distributed on a circle of radius r. Assuming there are n coils on the circle, the resultant magnetic moment about the center point is:

[0045] M3 total =n·M·(1 / r 3 (5)

[0046] Where M is the magnetic moment of a single coil.

[0047] Vector synthesis of the magnetic fields generated by different arrays of transmitting coils is performed to simulate the effect of a large-area transmitting coil. Different arrangement methods can be selected according to different terrains. If multiple coils are arranged in a square or circular pattern with a distance d between them, the synthesized magnetic moment M is obtained. total The magnetic moment M of each coil can be used to... i Superposition calculation:

[0048]

[0049] Where, r i f(r) represents the distance from each coil to the detection point. i ,d) represents the function of magnetic field decay with distance.

[0050] like Figure 2 As shown, the workflow of the array-type electromagnetic detection and emission synthesis excitation system is as follows:

[0051] Step 1: First, number the transmitting coils and perform a position self-check using the satellite positioning system to confirm whether positioning has been completed.

[0052] Step 2: The satellite positioning system sends coordinate information to each launch control module. The launch control module arranges the launch coil modules in an array according to the coordinate information. The satellite positioning system then checks whether the arrangement is successful.

[0053] Step 3: After each transmitting coil module is ready, it awaits the issuance of the transmission command. The transmission control module receives the time base signal generated by the time base synchronization module and achieves time synchronization through a high-precision crystal oscillator. The transmitting coil modules simultaneously emit current pulses according to the transmission command, generating a stable electromagnetic field.

[0054] Step 4: After the launch is completed, update the position of the transmitting coil module again, adjust it to the next detection position, traverse all detection positions, and then send a return signal to return and end.

[0055] The array-type electromagnetic detection and transmission synthetic excitation system maintains time synchronization by transmitting pulse signals through the satellite positioning system, ensuring the consistency of the transmitted waveform. After the satellite positioning system performs time synchronization correction at time t0, it sets the current to turn on at the Nth pulse and turn off at the Mth pulse by counting the clock pulses output by the crystal oscillator, where M>N, thereby achieving precise time control of the transmission current.

[0056] like Figure 3The diagram shows the effect of the superposition of magnetic fields generated by multiple coils arranged in a 2×2 square.

[0057] In an array-type electromagnetic detection and transmission synthetic excitation system, synchronous transmission is a crucial step to ensure the coordinated operation of multiple transmitting coils. Since multiple coils are distributed in different locations, precise time synchronization of the transmissions is essential to avoid signal misalignment and data interference. Using satellite positioning systems such as the Global Positioning System (GPS) or the BeiDou Navigation Satellite System can provide precise pulse signals as a time reference for the entire system.

[0058] The time reference synchronization module receives pulse signals from the satellite positioning system and generates a time reference signal. This time reference signal ensures that pulse currents are transmitted to the transmitting coil at the same time. To achieve this synchronization, the transmitting control module uses a crystal oscillator to precisely control the switching frequency of the current. The crystal oscillator converts the pulse signal into a finer frequency control signal, ensuring that the transmitting coil transmits electromagnetic pulses at the set frequency at the specified time.

[0059] Multiple transmitting coil modules begin operating synchronously, simultaneously generating magnetic fields and transmitting them underground. When a pulsed current passes through the coil, the change in current induces an electromagnetic field on the surface. Because all transmitting coil modules transmit at the same time, these magnetic fields superimpose on the surface, aiding in the detection of deep underground structures. The accuracy of synchronous transmission directly affects the superposition effect of the magnetic fields; if the transmitting coil modules are not accurately synchronized, it may lead to distorted detection signals, affecting the final data analysis and identification of underground resources.

[0060] A detailed explanation of the steps for an array-type electromagnetic detection and transmission synthetic excitation system, using a UAV carrying a transmitting coil as an example:

[0061] Step A1: First, number the transmitting coils to confirm the location of the transmitting coil module.

[0062] In step A2, the drones perform a self-test using a satellite positioning system. This system precisely locates the current position of each drone, including longitude, latitude, and altitude, and monitors its changes in real time to ensure the drone array follows a predetermined trajectory. Simultaneously, a time reference signal generated by the time reference synchronization module synchronizes all transmitting coil modules, which is crucial for the synchronization of subsequent transmission pulses. If the satellite positioning system self-test fails, the system will issue an error signal; if successful, it proceeds to the next step.

[0063] In step A3, each UAV carrying a transmission coil module enters operational mode and transmits its position coordinates to each transmission control module. The position of the transmission coil module is determined based on satellite system positioning, and the transmission coil modules are arranged according to a pre-set layout. The system determines whether the UAV array has been successfully arranged and is ready. If it fails, necessary adjustments will be made, including fine-tuning the spatial position of the UAVs and correcting the coil orientation.

[0064] Step A4: After all coils are ready, wait for the transmission information to be released. After the transmission information is released, confirm the time synchronization status of each transmitting coil to ensure that electromagnetic pulses can be transmitted at the same time. This synchronization is controlled by a crystal oscillator, which receives a time reference signal to ensure precise timing control.

[0065] Step A5: After time synchronization is completed, all transmitting coil modules in the UAV array simultaneously generate current pulses. The magnitude and frequency of the current are adjusted by a high-precision crystal oscillator to ensure that the current changes according to the predetermined magnitude and frequency and generates the corresponding electromagnetic field.

[0066] Step A6: After launch, the UAV array updates its position via satellite positioning system, adjusts to the next detection position, and launches again. This ensures the UAVs cover the entire target area until the entire detection area has been traversed.

[0067] Furthermore, the working process of the crystal oscillator will be explained:

[0068] The periodic signal generated by the crystal oscillator, after being divided or multiplied, outputs a clock signal with the target current frequency. By adjusting the signal generated by the crystal oscillator, the frequency variation of the current can be made to meet the requirements. The timing of the current change is also controlled by the crystal oscillator. The periodic signal provided by the crystal oscillator acts as a timer, enabling the current to change at precise times.

[0069] The frequency of the crystal oscillator provides the system's reference clock signal, determining the start and stop times of the current. For multiple transmitting coils, controlled by the same crystal oscillator signal, they can synchronously transmit electromagnetic waves at the same time.

[0070] like Figure 4 As shown, taking the synchronous transmission current of three coils as an example, this illustrates the synchronous control of the transmission current by multiple coils. A crystal oscillator outputs a clock signal of a fixed frequency. By counting these clock pulses, the timing of the transmission current can be precisely controlled. The satellite performs time synchronization correction at time t0, setting the current to turn on at the Nth pulse (corresponding to time t1) and turn off at the Mth pulse (corresponding to time t2), thus achieving precise timing control of the transmission current.

Claims

1. An array-type electromagnetic detection and emission synthesis excitation system, characterized in that, include: A transmitting coil module consists of multiple transmitting coils arranged at a certain interval in a square, circular or other structure, used to transmit electromagnetic signals; The transmission control module dynamically adjusts the parameters of the transmission current and controls the working state of the transmission coil module according to the detection requirements and environmental conditions. The time reference synchronization module receives time and position signals provided by the satellite, calibrates the clock and position using satellite positioning signals, and enables synchronous transmission of multiple coils. The time reference synchronization module sends the satellite time signal and position signal to the launch control module; The transmission control module generates a transmission command based on a time base and sends it to each transmission coil module; each transmission coil module simultaneously emits current pulses to generate a stable electromagnetic field based on the received transmission command. Each transmitting coil module is equipped with an independent controller, which controls the current pulses within the transmitting coil module, including the current amplitude and frequency. Each controller maintains a local clock via a crystal oscillator and receives a time reference signal from the time reference synchronization module to periodically calibrate the crystal oscillator clock.

2. The array-type electromagnetic detection and emission synthesis excitation system according to claim 1, characterized in that, The arrangement of the transmitting coil modules is adjustable.

3. The method for implementing the array-type electromagnetic detection and emission synthesis excitation system as described in any one of claims 1 to 2, characterized in that, The steps include the following: S1. Number the transmitting coil and perform a position self-check using the satellite positioning system to confirm whether positioning has been completed; S2, the satellite positioning system sends coordinate information to each launch control module. The launch control module arranges the launch coil modules in an array according to the coordinate information. The satellite positioning system then checks whether the arrangement is successful. S3, after each transmitting coil module is ready, it waits for the transmission command to be issued; the transmission control module receives the time base signal generated by the time base synchronization module and realizes time synchronization through a high-precision crystal oscillator; the transmitting coil module simultaneously emits current pulses according to the transmission command to generate a stable electromagnetic field; S4. After the launch is completed, the position of the transmitting coil module is updated again, adjusted to the next detection position, and after traversing all detection positions, a return signal is sent, and the process ends.

4. The method for implementing the array-type electromagnetic detection and emission synthesis excitation system according to claim 3, characterized in that, After the satellite positioning system performs time synchronization correction at time t0, it counts the clock pulses output by the crystal oscillator and sets the current to turn on at the Nth pulse and turn off at the Mth pulse, where M > N.

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