A downhole high-power long-distance radio wave perspective detection system
By employing digital resonant transmission modules, transmission power adjustment, and intelligent wave selection technology in radio wave imaging equipment, combined with a high-sensitivity receiver, the signal instability problem of radio wave imaging equipment in long-distance detection in mining areas has been solved, achieving more accurate measurements and higher resolution, and ensuring safe and efficient production in mines.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- FUZHOU HUAHONG INTELLIGENT TECH
- Filing Date
- 2026-03-17
- Publication Date
- 2026-06-02
AI Technical Summary
Existing radio wave imaging equipment suffers from unstable signals and insufficient penetration in long-distance mining operations, failing to meet the needs of detecting the internal structure of long-distance working faces and affecting safe and efficient mine production.
It employs a digital resonant downhole radio wave transmission module, a transmission power adjustment module, and an all-around intelligent wave selection module, combined with digital DDS and PWM technology, to achieve efficient transmission and signal extraction. It also uses a high-sensitivity receiver and optimized receiving circuitry to optimize signal processing algorithms.
It improves the resolution of geological anomalies, enabling more accurate measurement data over long working faces and supporting safe and efficient mine production.
Abstract
Description
Technical Field
[0001] This invention relates to the field of radio wave detection technology, specifically a downhole high-power long-distance radio wave imaging detection system. Background Technology
[0002] Radio wave imaging (also known as pit penetration) is a commonly used method for detecting the geological structure inside the longwall face in coal mines. The current radio wave imaging equipment in the industry has a limited penetration range, which is mainly limited by the effective transmission power of the transmitter antenna, the background noise of the receiving equipment, and the ability to selectively process the signal. The penetration capability is mostly within 260m, which is not suitable for long-distance (>400m) longwall face detection in mining areas. It also suffers from unstable signal reception or even no signal reception, resulting in poor application effect.
[0003] To address the aforementioned issues, this project aims to conduct research on high-power radio wave multi-frequency transmission and reception technology in underground mines, develop a long-distance radio wave perspective detection system, provide more accurate measurement data, improve the resolution of geological anomalies, conduct engineering application tests, provide technical support for the detection of internal structures in long-distance longwall mining faces, and ensure safe and efficient mine production.
[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention
[0005] The technical problem to be solved by this invention is to overcome the above-mentioned technical defects and provide a high-power long-distance radio wave perspective detection system for underground mining. This system can provide more accurate measurement data, improve the resolution of geological anomalies, conduct engineering application tests, provide technical support for the detection of internal structures in long-distance longwall mining faces, and ensure safe and efficient mine production.
[0006] To address the aforementioned problems, the technical solution of this invention is a downhole high-power long-range radio wave imaging detection system, comprising: The digital resonant downhole radio wave transmitting module uses a digital Class D amplifier and a digital DDS combined with PWM transmission technology. It utilizes an extremely high-frequency H-bridge transmitting circuit to achieve a significant amplification of digital signals, thereby realizing efficient digital transmission technology. The transmission power adjustment module includes a transmission current detection circuit and a digital DCDC boost circuit. When the shape of the transmitting antenna is fixed, if the system detects that the transmission power has not reached the maximum power, the CPU adjusts the transmission voltage at this time. At the same time, the current detection circuit will detect the transmission current (I) at this time. According to P=UI, the power is continuously adjusted until the transmission power reaches the maximum power. The all-around intelligent wave selection module adopts fully digital technology to avoid the introduction of new interference and accurately extract the effective signal.
[0007] Preferably, the transmission power adjustment module has a built-in digitally adjustable DC-DC boost voltage circuit. The transmission power is changed by adjusting the transmission voltage. The transmission power is obtained by detecting the magnitude of the transmission voltage and transmission current. Since the internal resistance of the transmission coil is fixed, the power can be adjusted by adjusting the transmission voltage.
[0008] Preferably, in the omnidirectional intelligent wave selection module, the time-domain signal is converted to the frequency domain through time-frequency conversion, the transmission frequency, amplitude, and phase are selected in the frequency domain, and the energy of other frequencies is suppressed through frequency domain filtering technology to extract the useful signal. Finally, the frequency domain signal is converted back to the time domain signal through time-frequency conversion to extract the effective signal.
[0009] Preferably, the electromagnetic waves emitted by the digital resonant downhole radio wave transmitting module have a maximum penetration capability of ≥400 meters.
[0010] Preferably, the system collects geological data from the mining area and conducts on-site radio wave imaging experiments in the mine to study the various radio wave imaging anomalies caused by the influence of different coal seams, rock strata, various structures and geological bodies on radio waves, thereby making geological inferences and interpretations.
[0011] Preferably, the system also includes a high-sensitivity receiver, using low-noise amplifiers, optimized receiving circuits, and signal processing algorithms to develop an integrated transmitter and receiver capable of transmitting and receiving at least four frequencies.
[0012] Preferably, the signal processing algorithm includes denoising, enhancement, and reconstruction, used to extract useful signal information and generate a clear perspective image. Through software, the correct measurement point coordinate parameters are set to obtain the ray distribution map, the measured field strength distribution map, and the absolute attenuation inversion map.
[0013] Preferably, the system is used to identify erosion zones within the working face where the coal thickness variation is greater than 1 / 3 of the average thickness.
[0014] Preferably, the system can provide a qualitative interpretation of faults with a displacement greater than 1 / 2 of the coal thickness.
[0015] The advantages of this invention compared to existing technologies are: 1. This invention, through research on high-power radio wave multi-frequency transmission and reception technology in underground mines, forms a long-distance radio wave perspective detection system, which can provide more accurate measurement data, improve the resolution of geological anomalies, conduct engineering application tests, provide technical support for the detection of internal structures in long-distance longwall mining faces in the industry, and ensure safe and efficient mine production. Detailed Implementation
[0016] To make the content of this invention easier to understand, the technical solutions in the embodiments of this invention will be clearly and completely described below in conjunction with the embodiments of this invention.
[0017] A high-power, long-distance underground radio wave imaging detection system is developed. By collecting geological data from the mining area and conducting on-site underground radio wave imaging experiments, the system studies the various radio wave imaging anomalies caused by the influence of different coal seams, rock strata, various structures, and geological bodies on radio waves in the mining area, thereby enabling geological inference and interpretation.
[0018] Considering both circuit and process structure aspects, and balancing coal mine safety requirements with maximizing effective power, a high-power radio wave transmission technology suitable for underground environments is proposed. This technology can penetrate working faces wider than 400m.
[0019] To receive weak signals after long-distance propagation and medium attenuation, a highly sensitive receiver needs to be designed. Using techniques such as low-noise amplifiers, optimized receiving circuits, and signal processing algorithms, a transmitter-receiver integrated unit capable of transmitting and receiving at least four frequencies is developed.
[0020] To improve the quality and resolution of perspective imaging, advanced signal processing algorithms were developed, including denoising, enhancement, and reconstruction algorithms, to extract useful signal information and generate clear perspective images. Supporting software was also developed; by setting the correct measurement point coordinate parameters, ray distribution maps, measured field strength distribution maps, and absolute attenuation inversion maps can be obtained.
[0021] A downhole high-power long-range radio wave imaging detection system includes: Digital resonant underground radio wave transmitting modules, used in mining environments, have stringent intrinsic safety and explosion-proof requirements. To ensure the acquisition of radio wave data penetrating the working face, the transmitter needs high transmission power and precise frequency. Therefore, given a fixed output power, higher effective transmission power is preferable, necessitating a high conversion rate. To address these issues, a digital Class D amplifier is employed. Class D amplifiers offer advantages such as high efficiency and small size. A digital DDS combined with PWM transmission technology, utilizing a high-frequency H-bridge transmitting circuit, significantly amplifies the digital signal, achieving highly efficient digital transmission, improving transmission conversion efficiency, and increasing the effective transmission power of the transmitting antenna.
[0022] The automatic power adjustment module addresses the impact of electromagnetic wave propagation properties. Besides penetrating the working face, the electromagnetic waves emitted by the transmitter must overcome attenuation caused by water vapor molecules, moist tunnels, and dust. Furthermore, the mutual inductance between the transmitter and surrounding metal elements such as anchor bolts and mesh, along with the transmitting antenna, also attenuates the electromagnetic waves, affecting the transmission power. The surrounding metal elements also vary at different transmission points. Therefore, the transmitter needs to automatically adjust its transmission power based on the environment to maximize output power. The automatic power adjustment function primarily consists of a transmission current detection circuit and a digital DC-DC boost circuit. When the transmitting antenna shape is fixed, if the system detects that the transmission power is below maximum, the CPU adjusts the transmission voltage. Simultaneously, the current detection circuit detects the transmission current (I). Based on P=UI, the built-in digitally adjustable DC-DC boost circuit allows adjustment of the transmission voltage to change the transmission power. By detecting the transmission voltage and current, the transmission power is obtained. Since the internal resistance of the transmitting coil is fixed, the power adjustment rate can be achieved by adjusting the transmission voltage.
[0023] This comprehensive intelligent wave selection module addresses the common problem that effective signals received by radio wave receivers are often overwhelmed by interference. Existing radio wave transducers typically employ frequency selection, using crystal filters to extract the effective radio frequency signal, but this method is not very effective. Based on this, our system integrates frequency selection, amplitude selection, and phase selection technologies to intelligently filter the signal comprehensively. Utilizing fully digital technology, it avoids introducing new interference, enabling more accurate extraction of the effective signal. This is the latest and most effective effective wave extraction technology for radio wave transducers, significantly improving the anti-interference capability and sensitivity of the receiving equipment. Since the effective signal has a very low signal-to-noise ratio compared to surrounding interference signals, it is practically impossible to extract the effective received signal in the time domain. Through time-frequency conversion, the time-domain signal is converted to the frequency domain. In the frequency domain, the transmission frequency, amplitude, and phase are selected, and frequency-domain filtering technology suppresses the energy of other frequencies, thereby extracting the useful signal. Finally, through time-frequency conversion, the frequency domain signal is converted back to the time domain signal, achieving early detection of the effective signal.
[0024] This invention enables the electromagnetic wave of a long-distance radio wave imaging system to penetrate up to 400 meters; it can identify erosion zones within the working face where the coal thickness variation is greater than 1 / 3 of the average thickness; and it can provide a qualitative interpretation of faults with a displacement greater than 1 / 2 of the coal thickness.
[0025] The present invention and its embodiments have been described above, and such description is not restrictive. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.
Claims
1. A downhole high-power long-range radio wave imaging detection system, characterized in that, include: The digital resonant downhole radio wave transmitting module uses a digital Class D amplifier and a digital DDS combined with PWM transmission technology. It utilizes an extremely high-frequency H-bridge transmitting circuit to achieve a significant amplification of digital signals, thereby realizing efficient digital transmission technology. The transmission power adjustment module includes a transmission current detection circuit and a digital DCDC boost circuit. When the shape of the transmitting antenna is fixed, if the system detects that the transmission power has not reached the maximum power, the CPU adjusts the transmission voltage at this time. At the same time, the current detection circuit will detect the transmission current (I) at this time. According to P=UI, the power is continuously adjusted until the transmission power reaches the maximum power. The all-around intelligent wave selection module adopts fully digital technology to avoid the introduction of new interference and accurately extract the effective signal.
2. The downhole high-power long-distance radio wave imaging detection system according to claim 1, characterized in that: The transmission power adjustment module has a built-in digitally adjustable DC-DC boost voltage circuit. The transmission power is changed by adjusting the transmission voltage. The transmission power is obtained by detecting the magnitude of the transmission voltage and transmission current. Since the internal resistance of the transmission coil is fixed, the power can be adjusted by adjusting the transmission voltage.
3. The downhole high-power long-distance radio wave imaging detection system according to claim 1, characterized in that: In the aforementioned all-around intelligent wave selection module, the time-domain signal is converted to the frequency domain through time-frequency conversion. The transmission frequency, amplitude, and phase are selected in the frequency domain. The energy of other frequencies is suppressed through frequency domain filtering technology to extract the useful signal. Finally, the frequency domain signal is converted back to the time domain through time-frequency conversion to extract the effective signal.
4. The downhole high-power long-distance radio wave imaging detection system according to claim 1, characterized in that: The electromagnetic waves emitted by the digital resonant downhole radio wave transmitting module have a maximum penetration capability of ≥400 meters.
5. A downhole high-power long-range radio wave imaging detection system according to claim 1, characterized in that, The system collects geological data from the mining area and conducts on-site radio wave imaging experiments in the mine to study the various radio wave imaging anomalies caused by the influence of different coal seams, rock strata, various structures and geological bodies on radio waves, thereby making geological inferences and interpretations.
6. The downhole high-power long-distance radio wave imaging detection system according to claim 1, characterized in that, The system also includes a high-sensitivity receiver, which uses low-noise amplifiers, optimized receiving circuits and signal processing algorithms to develop an integrated transmitter and receiver capable of transmitting and receiving at least four frequencies.
7. A downhole high-power long-distance radio wave imaging detection system according to claim 6, characterized in that, The signal processing algorithm includes denoising, enhancement, and reconstruction, which are used to extract useful signal information and generate clear perspective images. Through software, the correct measurement point coordinate parameters are set to obtain ray distribution maps, measured field strength distribution maps, and absolute attenuation inversion maps.
8. The downhole high-power long-distance radio wave imaging detection system according to claim 1, characterized in that: The system is used to identify erosion zones within the working face where the coal thickness variation is greater than 1 / 3 of the average thickness.
9. A downhole high-power long-distance radio wave imaging detection system according to claim 1, characterized in that: The system can provide a qualitative interpretation of faults with a displacement greater than 1 / 2 of the coal thickness.