Developments of airborne survey on an unmanned helicopter for quick observation of gravity and magnetics

2014 ◽  
pp. 1363-1368
Author(s):  
S Tokue ◽  
Y Ogura ◽  
H Morikawa ◽  
S Matsuda ◽  
I Yokoi ◽  
...  
Keyword(s):  
Unmanned Helicopter ◽  
Airborne Survey

scholarly journals Aeromagnetic survey in Kusatsu-Shirane volcano, central Japan, by using an unmanned helicopter

2021 ◽  
Vol 73 (1) ◽  
Author(s):  
Takao Koyama ◽  
Wataru Kanda ◽  
Mitsuru Utsugi ◽  
Takayuki Kaneko ◽  
Takao Ohminato ◽  
...  
Keyword(s):  
Hydrothermal Systems ◽  
Magnetic Data ◽  
Unmanned Helicopter ◽  
Quaternary Period ◽  
Aeromagnetic Survey ◽  
Magnetization Intensity ◽  
Line Spacing ◽  
Normal Polarity ◽  
The Cost ◽  
Measurement Line

AbstractKusatsu-Shirane volcano is one of the active volcanoes in Japan. Phreatic explosions occurred in Mt. Shirane in 1983 and most recently, in 2018, in Mt. Motoshirane. Information on the subsurface structure is crucial for understanding the activity of volcanoes with well-developed hydrothermal systems where phreatic eruptions occur. Here, we report aeromagnetic surveys conducted at low altitudes using an unmanned helicopter. The survey aimed to obtain magnetic data at a high spatial resolution to map the magnetic anomaly and infer the magnetization intensity distribution in the region immediately after the 2018 Mt. Motoshirane eruption. The helicopter used in the survey was YAMAHA FAZER R G2, an autonomously driven model which can fly along a precisely programmed course. The flight height above the ground and a measurement line spacing were set to ~ 150 m and ~ 100 m, respectively, and the total flight distance was 191 km. The measured geomagnetic total intensity was found to vary by ~ 1000 nT peak-to-peak. The estimated magnetization intensity derived from measured data showed a 100 m thick magnetized surface layer with normal polarity, composed of volcanic deposits of recent activities. Underneath, a reverse-polarity magnetization was found, probably corresponding to the Takai lava flow in the Early Quaternary period (~ 1 Ma) mapped in the region. Our results demonstrate the cost-effectiveness and accuracy of using drone magnetometers for mapping the rugged terrain of volcanoes.

Automatic Flight Control of Unmanned Helicopter Based on Nonlinear Model

2012 ◽  
Vol 472-475 ◽  
pp. 1492-1499
Author(s):  
Run Xia Guo
Keyword(s):  
Nonlinear Model ◽  
Flight Control ◽  
Attitude Control ◽  
Lyapunov Stability Theory ◽  
Test Results ◽  
Unmanned Helicopter ◽  
Control Laws ◽  
Control Approach ◽  
State Dependent ◽  
Compensation Technique

The Unmanned helicopter (UMH) movement was divided into two parts, namely, attitude and trajectory motion. And then a two-timescale nonlinear model was established. The paper improved and expanded state dependent riccati equation (SDRE) control approach, deriving analytical conditions for achieving global asymptotic stability with lyapunov stability theory. Proof was given. By combining improved SDRE control with nonlinear feed-forward compensation technique, the full envelop flight attitude control laws could be designed. On the basis of attitude control, trajectory controller was developed. Actual flight tests were carried out. Test results show that the control strategy is highly effective.

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