A Novel Strategy for Improving the Aeromagnetic Compensation Performance of Helicopters

Chen, Luzhao; Wu, Pei‐Lin; Zhu, Wenhao; Feng, Yongqiang; Fang, Guangyou

doi:10.3390/s18061846

Cited by 15 publications

(10 citation statements)

References 18 publications

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“…Therefore, the magnetic interference varies with the current in the cables. In addition, the airframe of the UAV is composed of carbon fiber, which is non-magnetic but conductive, akin to graphite (Chung, 2010). As a result, eddy (Stoll, 1974) may play a role in magnetic interference during flight.…”

Section: Source Of Magnetic Interferencementioning

confidence: 99%

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Experiments on magnetic interference for a portable airborne magnetometry system using a hybrid unmanned aerial vehicle (UAV)

Jirigalatu¹,

Krishna

Silva

et al. 2021

Geosci. Instrum. Method. Data Syst.

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Abstract. Using unmanned aerial vehicles (UAVs) for airborne magnetometry offers not only improved access and rapid sampling but also reduced logistics costs. More importantly, the UAV-borne aeromagnetometry can be performed at low altitudes, which makes it possible to resolve fine features otherwise only evident in ground surveys. Developing such a UAV-borne aeromagnetometry system is challenging owing to strong magnetic interference introduced by onboard electric and electronic components. An experiment concerning the static magnetic interference of the UAV was conducted to assess the severity of the interference of a hybrid vertical take-off and landing (VTOL) UAV. The results of the static experiment show that the wing area is highly magnetic due to the proximity to servomotors and motors, whereas the area along the longitudinal axis of the UAV has a relatively smaller magnetic signature. Assisted by the static experiment and aerodynamic simulations, we first proposed a front-mounting solution with two compact magnetometers. Subsequently, two dynamic experiments were conducted with the setup to assess the dynamic interference of the system. The results of the dynamic experiments reveal that the strongest source of in-flight magnetic interference is the current-carrying cables connecting the battery to the flight controller and that this effect is most influential during pitch maneuvers of the aircraft.

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Section: Source Of Magnetic Interferencementioning

confidence: 99%

“…6) to further reduce the magnetic noise from the UAV. Meanwhile, the two-magnetometer setup provides a solution that eases the filtering of the magnetic noise (Chen et al, 2018;Mu et al, 2020). The two compact magnetometers are manufactured by QuSpin, abbreviated as QTFM.…”

Section: A Front-boom Setupmentioning

confidence: 99%

Experiments on magnetic interference for a portable airborne magnetometry system using a hybrid unmanned aerial vehicle (UAV)

Jirigalatu¹,

Krishna

Silva

et al. 2021

Geosci. Instrum. Method. Data Syst.

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show abstract

“…CC BY 4.0 License. Based on the result of the static experiment and the aerodynamic analysis, we slightly tweaked the initial set-up as shown in Fig 4, still mounting two magnetometers on a boom mounted on the noise-tip but now with both sensors further away from the aircraft (Fig 5) to reduce the amount of noise on the sensors and provide a solution where filtering out magnetic noise from the UAV becomes easier (Chen et al, 2018;Mu et al, 2020).…”

Section: A Front-boom Setupmentioning

confidence: 99%

Experiments on magnetic interference for a portable airborne magnetometry system using a hybrid unmanned aerial vehicle (UAV)

Jirigalatu¹,

Krishna²,

Silva³

et al. 2020

Preprint

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Abstract. Airborne magnetic surveys are an important and efficient tool for mapping the subsurface, providing insights e.g. into mineral deposits. Compared to traditional ground methods, airborne magnetic surveys offer great advantages with improved access and rapid sampling. But the cost and hassle of transporting and operating a conventional manned airborne magnetic survey system are strong impediments for its wider use. In addition, the conventional airborne systems are challenged by the need for low-altitude (&leq; 80 m) surveying to detect small-scale subsurface features evident in ground surveys. Portable and compact airborne magnetic survey systems using unmanned aerial vehicles (UAVs) can not only bridge the gap between conventional airborne magnetic surveys and ground magnetic surveys but also complement magnetic surveys to fit broader geophysical applications. Therefore, developing high-quality, stable, and portable UAV-borne survey systems is of high interest to the geophysical exploration community. However, developing such a system is challenging owing to strong magnetic interference introduced by onboard electric engines and other onboard electronic devices. As a result, tests concerning the static and dynamic magnetic interference of a UAV are critical to assess the severity of the interference and can help to improve the design of the system at the early stage of development. A static experiment and two dynamic experiments were conducted to understand the characterization of the magnetic interference of our hybrid vertical take-off and landing (VTOL) UAV. The results of the static experiment show that the wing area is highly magnetic due to the proximity to servomotors and motors, but the area along the longitudinal axis of the UAV is relatively magnetically quiet. To reduce the magnetic signature, the highly-magnetic servomotors on the wings were replaced with less magnetic servomotors of a brush-less type. Assisted by aerodynamic simulations, we further designed a front-mounting solution for two compact magnetometers. Two dynamic experiments were conducted with this setup to understand the dynamic interference of the UAV in operation. The results of the dynamic experiments reveal that the strongest source of in-flight magnetic interference is mainly due to the cables connecting the battery to the flight controller and that this effect is most influential during pitch maneuvers of the aircraft.

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“…With the magnetometers installed aboard aircrafts, people can measure the magnetic field at a very flexible scale [2]. However, since the aircraft has its own magnetic field, which degrades the reliability of the measurements, a technique to reduce the magnetic interference field is required, that is, aeromagnetic compensation [3,4].…”

Section: Introductionmentioning

confidence: 99%

An Aeromagnetic Compensation Method Based on a Multimodel for Mitigating Multicollinearity

Zhao

Han

Peng

et al. 2019

Sensors

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Aeromagnetic surveys play an important role in geophysical exploration and many other fields. In many applications, magnetometers are installed aboard an aircraft to survey large areas. Due to its composition, an aircraft has its own magnetic field, which degrades the reliability of the measurements, and thus a technique (named aeromagnetic compensation) that reduces the magnetic interference field effect is required. Commonly, based on the Tolles–Lawson model, this issue is solved as a linear regression problem. However, multicollinearity, which refers to the case when more than two model variables are highly linearly related, creates accuracy problems when estimating the model coefficients. The analysis in this study indicates that the variables that cause multicollinearity are related to the flight heading. To take this point into account, a multimodel compensation method is proposed. By selecting the variables that contribute less to the multicollinearity, different sub-models are built to describe the magnetic interference of the aircraft when flying in different orientations. This method restricts the impact of multicollinearity and improves the reliability of the measurements. Compared with the existing methods, the proposed method reduces the interference field more effectively, which is verified by a set of airborne tests.

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A Novel Strategy for Improving the Aeromagnetic Compensation Performance of Helicopters

Cited by 15 publications

References 18 publications

Experiments on magnetic interference for a portable airborne magnetometry system using a hybrid unmanned aerial vehicle (UAV)

Experiments on magnetic interference for a portable airborne magnetometry system using a hybrid unmanned aerial vehicle (UAV)

Experiments on magnetic interference for a portable airborne magnetometry system using a hybrid unmanned aerial vehicle (UAV)

An Aeromagnetic Compensation Method Based on a Multimodel for Mitigating Multicollinearity

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