Youngwoo Choi

U-Tel (South Korea)

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Co-Authors

Joono Cheong

Korea University

Hyun Min

Korea Institute of Machinery and Materials

Dong Kyoo Kim

Electronics and Telecommunications Research Institute

G. N. Taylor

University of Melbourne

A. Kusaka

Tohoku University

S. Bahinipati

Indian Institute of Technology Bhubaneswar

M. Große Perdekamp

University of Illinois Urbana-Champaign

M. Nakao

Universidade Federal de Minas Gerais

L. S. Peak

University of Sydney

N. Soni

Healthcentric Advisors

Cooperative Institutions

Campbell Collaboration

High Energy Accelerator Research Organization

University of the Basque Country

University of Cincinnati

Princeton University

National Taiwan University

Nagoya University

European Organization for Nuclear Research

Chonnam National University

The University of Tokyo

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Multichannel W-Band SAR System on a Multirotor UAV Platform With Real-Time Data Transmission Capabilities

IEEE Access (2020)

Sumin Kim Se‐Yeon Jeon Jeongbae Kim Ui Min Lee Seungha Shin

In recent years, the demand for small-scale remote sensing, which is used in disaster monitoring, agriculture, and ground subsidence has increased. A multichannel synthetic aperture radar (SAR) system can provide image and topographic information of the illuminated scene, regardless of adverse weather conditions. As a cost-effective solution to radar imaging, a multichannel W-band SAR system mounted on a multirotor unmanned aerial vehicle (UAV) is presented. The radar module was designed to operate at W-band to achieve small size and weight allowing the module to be mounted on multirotor UAVs with small payload. A detailed description of the design and measurement of the system is provided in this paper. The radar imaging capability of the developed system was verified by performing outdoor experiments using isolated buildings as targets. The multichannel functionality of the system was verified by measuring height of a point target placed above the ground. The measurements and experiments verified the feasibility of a multichannel radar mounted on a multirotor UAV for imaging and topographic applications.

Multirotor

Payload (computing)

3D radar

Radar lock-on

Man-portable radar

10.1109/access.2020.3014700

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Citations (16)

Study of the Y (4260) resonance in e+ e- collisions with initial state radiation at Belle

Presented at (2006)

Kazuo Abe Y. Chao A. Murakami D. Liventsev R. Kulasiri

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Citations (17)

The method of radar implementation based on the split-channel technology

Dong Kyoo Kim Kang Do Wook Youngwoo Choi

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Zero-offset calibration using a screw theory

Youngwoo Choi Joono Cheong Jin Ho Kyung Hyun Min

In this paper, we propose an algorithm to easily correct zero-offset in robotic manipulators by identifying screw information. The proposed algorithm improves the accuracy of the robot even if there may be errors in the other geometric parameters. To identify the screw information, the robot is made to create a circular trajectory by rotating a certain joint, while other joints being fixed, and then its endpoints are measured by a laser tracker. The screw information such as rotation axis and a point along the axis is computed through a least-square circle fit. By comparing the resulting screw information from the measurement and that from the kinematic model, we determine the amount of zero-offset in the least square sense. Thus we can enhance the position accuracy by compensating for the determined zero-offset associated with the kinematic model. We show the effectiveness of the proposed algorithm via experimentation using a dual arm robot manipulator.

Screw theory

Screw axis

Laser tracker

10.1109/urai.2016.7625770

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Citations (4)

Analysis of scheme interrelationships for model calibration and improvement using the Noah land surface model with multi-physics options

AGU Fall Meeting Abstracts (2013)

Seung Jin Hong S. K. Park Youngwoo Choi Boksoon Myoung

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Dynamics superposition method for separating torque components of robot manipulators using sinusoidal trajectories

Journal of Mechanical Science and Technology (2017)

Youngwoo Choi Dawoon Jung Joono Cheong Hyun Min Jinho Kyung

Dynamics

Fictitious force

10.1007/s12206-017-1045-9

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Citations (3)

Self-calibration for arrayed penetrating radar

2022 24th International Conference on Advanced Communication Technology (ICACT) (2017)

Dong Kyoo Kim Youngwoo Choi

This paper describes a calibration method for arrayed radar. By using an additional pair of transmit/receive ports, online calibration for arrayed radar is possible.

3D radar

10.23919/icact.2017.7890197

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