The Development and Applications of the Helicopter-borne Transient Electromagnetic System CAS-HTEM

Wu, Xiaofeng; Fang, Guangyou; Xue, Guangtao; Liu, Lihua; Liu, Leisong; Li, Jutao

doi:10.2113/jeeg24.4.653

Cited by 10 publications

(3 citation statements)

References 26 publications

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“…Optical remote sensing data preprocessing mainly includes geometric correction, radiation correction, and mosaic, of which geometric correction uses the corrected 1:50,000 topographic map as a reference, and the RMS error falls within a pixel. Atmospheric radiation correction was completed in the FLASSH atmospheric correction module of the ENVI4.8 software to form the reflectivity image, and then the image was enhanced and cut [35][36][37][38]. Non-remote sensing information sources mainly include geological environment background data, topographic maps (1:50,000), geological maps, administrative division maps, and water system maps.…”

Section: Data Source and Preprocessingmentioning

confidence: 99%

Risk Assessment of Geological Landslide Hazards Using D-InSAR and Remote Sensing

Zhong,

Li,

Zhang

et al. 2024

Remote Sensing

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Landslide geological disasters, occurring globally, often result in significant loss of life and extensive economic damage. In recent years, the severity of these disasters has increased, likely due to the frequent occurrence of extreme rainstorms associated with global warming. This escalating trend emphasizes the urgent need for a simple and efficient method to identify hidden dangers related to landslide geological disasters. Areas experiencing seasonal heavy rainfall are particularly susceptible to such disasters, posing a serious threat to the lives and property of local residents. In response to the challenging characteristics of landslide geological hazards, such as their strong concealment and the high vegetation coverage in the Liupan Mountain area of the Loess Plateau, this study focuses on the integrated remote sensing identification and research of hidden landslide dangers in Longde County. The methodology combines differential interferometric synthetic aperture radar technology (D-InSAR) and high-resolution optical remote sensing. Surface deformation information of Longde County was obtained by analyzing 85 Sentinel-1A data from 2019 to mid-2020 using Stacking-InSAR, in conjunction with high-resolution optical remote sensing image data from GF-2 in 2019. Furthermore, the study conducted integrated remote sensing identification and field verification of landslide hazards throughout the entire county. This involved interpreting the shape and deformation marks of landslide hazards, identifying the disaster-bearing bodies, and expertly interpreting the environmental factors contributing to the hazards. As a result, 47 suspected landslide hazards and 21 field investigation points were identified, with 16 hazards verified with an accuracy of 76.19%. This outcome directly confirms the applicability and accuracy of the integrated remote sensing identification technology in the study area. The research results presented in this paper provide an effective scientific and theoretical basis for the monitoring and treatment of landslide geological disasters in the future stages. They also play a pivotal role in the prevention of such disasters.

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Section: Data Source and Preprocessingmentioning

confidence: 99%

Risk Assessment of Geological Landslide Hazards Using D-InSAR and Remote Sensing

Zhong,

Li,

Zhang

et al. 2024

Remote Sensing

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“…At present, China has carried out large-scale application of airborne electromagnetic exploration technology, mainly in uranium and polymetallic mineral exploration. Airborne electromagnetic method can measure the signal of artificial or natural field source passing through the underground geological body to study the distribution of the geological body in the underground space [3,4]. The effective experimental application in railway engineering exploration in complex terrain areas in China has further expanded the application scenarios of airborne electromagnetic method.…”

Section: Forewordmentioning

confidence: 99%

Application Prospect of Airborne Electromagnetic Method in Engineering Exploration

Wang,

Niu,

Wang

2023

J. Phys.: Conf. Ser.

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Airborne electromagnetic method has developed rapidly since the twentieth century and has been maturely applied to uranium and polymetallic mineral exploration and railroad engineering survey in China. Engineering survey is an important foundation to guarantee the construction of cities and infrastructure in China, Further exploration of the introduction of airborne electromagnetic method in engineering survey can greatly promote the process of engineering construction in China and guarantee the strategic needs of national key projects.

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“…The Geotech VTEM system, earlier focusing on late-gate data quality for deep mineral exploration, has indicated that placing the receiver in the center of the transmitting coils shielded by a concentric bucking coil could effectively improve the near-surface imaging [ 10 ]. Some other HTEM systems with similar configuration include the Xcite system by New Resolution Geophysics [ 11 ], the CAS-HTEM by the Chinese Academy of Sciences [ 12 ], and so on. Moreover, the AeroTEM-IV system manufactured by Aeroquest (acquired by Geotech) is the first to introduce the eccentric bucking coil into the HTEM system [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

A New Weak-Coupling Method with Eccentric Dual Bucking Coils Applied to the PRBS Helicopter TEM System

Liu

Jiang

et al. 2022

Sensors

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In the helicopter transient electromagnetic system (HTEM), weak-coupling coils reduce the mutual inductance of the transmitting and receiving coils, which can protect the data acquisition circuit and improve the signal-to-noise of the system. The PRBS HTEM system is a newly proposed multi-receiver EM measurement system, which can effectively identify the system impulse response of the unknown geological model based on the high-precision synchronous recording signal of the PRBS emitted current and induced voltage. However, the standard PRBS current signal is turned on/off very quickly, easily resulting in signal saturation. Concerning this problem, this paper proposes a new weak-coupling structure named eccentric dual bucking coils for the multi-receiver EM system by analyzing the on/off characteristics of PRBS current and the magnetic field distribution of the transmitter–receiver system. It also verifies the feasibility of the proposed structure by Maxwell software simulation. Furthermore, considering the influence of the residual primary field and other factors, the data preprocessing results of the PRBS method and the traditional square wave method are compared by theoretical analysis and data simulation, and the results show that the earlier-time response data can be obtained by PRBS method under the same simulation conditions. Finally, the reliability of the proposed method is verified by ground experiment.

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The Development and Applications of the Helicopter-borne Transient Electromagnetic System CAS-HTEM

Cited by 10 publications

References 26 publications

Risk Assessment of Geological Landslide Hazards Using D-InSAR and Remote Sensing

Risk Assessment of Geological Landslide Hazards Using D-InSAR and Remote Sensing

Application Prospect of Airborne Electromagnetic Method in Engineering Exploration

A New Weak-Coupling Method with Eccentric Dual Bucking Coils Applied to the PRBS Helicopter TEM System

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