Seungha Shin

U-Tel (South Korea)

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Sumin Kim

Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)

Min‐Ho Ka

Yonsei University

Jeongbae Kim

Yonsei University

Se‐Yeon Jeon

Samsung Medical Center

Seok Kim

Korea Atomic Energy Research Institute

Munsung Kim

Samsung (South Korea)

Aulia Dewantari

Sepuluh Nopember Institute of Technology

Gye-Suk Jun

Kye-Suk Jun

Kyung Hee University

Youngwoo Choi

U-Tel (South Korea)

Cooperative Institutions

Yonsei University

Samsung (South Korea)

Hanwha Solutions (South Korea)

Sungkyunkwan University

U-Tel (South Korea)

Pohang University of Science and Technology

Electronics and Telecommunications Research Institute

Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)

University of Illinois Urbana-Champaign

Gyeongsang National University

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W-Band FMCW MIMO Radar System for High-Resolution Multimode Imaging With Time- and Frequency-Division Multiplexing

IEEE Transactions on Geoscience and Remote Sensing (2020)

Se‐Yeon Jeon Sumin Kim Jeongbae Kim Seok Kim Seungha Shin

A W-band multiple-input multiple-output (MIMO) radar imaging system has been proposed. The 4 × 4 radar system that forms a 2-D virtual array operates at a center frequency of 94 GHz and bandwidth of 1 GHz with frequency-modulated continuous wave. A hybrid scheme comprising time- and frequency-division multiplexing is introduced for establishing orthogonal waveforms, where the transmit channels perform alternate transmission in pairs. The proposed scheme can efficiently extend the number of MIMO channels utilizing the existing hardware with simultaneous transmission. The design, implementation, measurements, and imaging results of the proposed radar system have been presented. The imaging performance was tested through outdoor experiments. The high-resolution performance was shown with images generated using a synthetic aperture radar. The impulse responses of all channels were measured, and the resolution was confirmed to be 0.15 m in all the channels. In addition, a human and a car at 100-m range were imaged using the proposed radar system. The polarimetric and interferometric capabilities were tested for multimode imaging with the MIMO configuration. Overall, the measurements and experimental results verified the feasibility of the proposed MIMO radar with hybrid scheme as a high-resolution multimode imaging system.

10.1109/tgrs.2020.2971998

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Citations (19)

High-Precision Measurement of Ice-Shelf Thickness Using Frequency-Modulated Interrupted Continuous Wave Method and Vernier-like Process

The Journal of Korean Institute of Electromagnetic Engineering and Science (2019)

Youngjae Lee Seungha Shin Eun Hee Kim

A radar system has been developed to predict global warming by measuring ice-shelf thicknesses. This system uses a frequency-modulated continuous-wave(FMCW) waveform and phase-sensitive method through the so-called Vernier-like process, which measures the target range by adding the fine range from the phase information to the rough range from the frequency. However, the continuous waves require a large dynamic range of the receiver because short-range and long-range reflection signals are received simultaneously. To improve this, we propose a frequency-modulated interrupted continuous wave(FMICW) method and demonstrate its performance through simulation. Although the proposed method reduces the signal-to-noise ratio(SNR) based on the same peak power, the gain can be adjusted according to the range, and the minimum detection range can be controlled.

Continuous wave

SIGNAL (programming language)

10.5515/kjkiees.2019.30.12.972

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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)

Experimental system of W-band multi-channel FMCW synthetic aperture radar for airborne platform

Sumin Kim Se‐Yeon Jeon Jeongbae Kim Aulia Dewantari Seok Kim

Early-warning radar

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W-Band MIMO FMCW Radar System With Simultaneous Transmission of Orthogonal Waveforms for High-Resolution Imaging

IEEE Transactions on Microwave Theory and Techniques (2018)

Se‐Yeon Jeon Min‐Ho Ka Seungha Shin Munsung Kim Seok Kim

This paper presents a multi-input multi-output (MIMO) radar with simultaneously transmitted orthogonal waveforms. The radar operates in W-band, 93.5-94.5 GHz, with frequency-modulated continuous wave (FMCW) signals. The radar is designed to be capable of simultaneous transmission rather than switching transmit channels. A suitable orthogonal waveform transmission method for the FMCW radar is selected and reflected in the transceiver design. The radar consists of a transceiver, antennas, and a signal processor. The design and specifications of each module are described in detail. The transceiver consists of two transmitting channels and two receiving channels. The transmitter is designed to have high transmit power aiming at the detection and imaging of objects with small radar cross section, up to 100-150-m range. A compact horn antenna and two-channel analog-to-digital converter with a high sampling rate are designed and fabricated. The performance of each module is measured and evaluated. The performance of the radar is tested through experiments. The MIMO capability of the radar was verified through the acquisition of the range profiles with respect to four distinct signal paths by distinguishing the simultaneously transmitted orthogonal signals. The experimental results verified that the specification of the radar system is feasible for high-resolution imaging applications.

Transceiver

Radar lock-on

10.1109/tmtt.2018.2867003

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Citations (37)

Low phase noise S-band PLL frequency synthesizer using DDS and offset mixing techniques

Asia-Pacific Microwave Conference (2009)

Jae-hung Choi Minsu Kim Seungha Shin Youngoo Yang

The paper presents the design and implementation of a DDS-driven PLL frequency synthesizer module using an offset mixing technique. The DDS, which is adopted as the reference generation for the PLL synthesizer, allows the synthesizer to have a fast switching time and narrow channel spacing. The offset mixing method allows an excellent in-band phase noise feature. The implemented frequency synthesizer has an excellent phase noise of -91.6 dBc/Hz at an offset of 10 KHz for the center frequency of 4.6 GHz.

dBc

Direct digital synthesizer

10.1109/apmc.2009.5384505

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A Study of Transceiver System for Ka-band Road Watch Radar

The Journal of Korean Institute of Communications and Information Sciences (2011)

Seungha Shin Gye-Suk Jun

본 논문에서는 도로 장애물 감시 레이더용 Ka 대역 송수신기를 설계 및 제작하였다. 도로 장애물 감시 레이더용 송수신기는 파형발생기, 주파수발생기, IF 송수신기, RF 상하향 변환기로 구성되어 있다. 송수신기는 탐지 거리별로 모드를 3가지로 구분하여 운용되며 이 때 Ka 대역에서 150MHz의 대역폭을 유지한다. 송신 출력은 22dBm 이상이며, 수신 이득은 30dB, 잡음 지수는 6dB인 성능을 얻었다. 수신 동적 범위는 63.28dB 이며, 수신 I/Q 채널 간 진폭 오차는 0.3dB, 위상 오차는 1.74도를 보였다. 시험 결과, 송수신기는 펄스 도플러 형태의 도로 감시 레이더에서 요구되는 전기적인 성능을 만족하였음을 확인하였다. In this paper, Ka-band transceiver for road watch radar system is designed and fabricated. The transceiver for road watch radar system is composed of waveform generator, frequency generator. IF transceiver and RF up/down converter. The transceiver especially has 3 different waveform mode for target detection range. The transceiver had over 150 MHz bandwidth in Ka-band and 22 dBm output power. The receiver gain and noise figure was 30 dB and 4 dB respectively. The receive dynamic range was 65.28dB and amplitude imbalance and phase imbalance of I/Q channel was 0.3 dB and 1.8 degree respectively. The transceiver meets the required electrical performances through the individual tests.

Transceiver

Ka band

10.7840/kics.2011.36a.11.933

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Citations (1)

Design and Implemetation of Compact 77 GHz Synthetic Aperture Radar for Drone Based Applications

Jeongbae Kim Sumin Kim Wimin Lee Seungha Shin Yeongwoo Choi

The demands on more immediately operating synthetic aperture radar (SAR) systems are increasing as SAR became a universal remote sensor that is applicable to a variety of missions. SAR systems mounted on unmanned aerial vehicles (UAV) are expected to provide suitable solutions to such demands, as extensive technological advancements have been made over the past decade in related fields. This paper presents a compact SAR system integrated into a rotary wing consumer drone. The system is designed into the dual receiver single-input-multiple-output (SIMO) configuration in order to provide a rich applicability for the system, including the capability of single path interferometry. To overcome inherent restrictions of small UAV platforms, millimeter wave architecture is adopted to provide considerable compactness and efficiency for the system. Design details and results from an outdoor experiment which was performed to prove that the system can produce proper SAR data are discussed as well.

Drone

10.1109/apsar46974.2019.9048293

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The Implementation of UWB Bandpass Filter using SIR(Stepped Impedance Resonators) Structure

The Journal of Korean Institute of Communications and Information Sciences (2010)

Seungha Shin Chang‐Ho Choi Kye-Suk Jun

A new compact UWB bandpass filter with sharp-rejection and low insertion-loss is designed in this paper, using the parallel transmission line with SIR structure. An Example filter is firstly theoretically designed by the proposed synthesis procedure, the optimized by EM simulator, fabricated in microstrip line and finally characterized by a network analyzer. A good agreement between the simulation results and prototype validates the proposed UWB bandpass filter. The designed filter also realized a sharp rejection of higher order with a relatively small size which is proper for the UWB communication system.

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