Sangdong Kim

Sangdong Kim
Daegu Gyeongbuk Institute of Science and Technology | DGIST · Department of interdisciplinary/Division of Automotive Technology

Ph. D

About

49
Publications
13,304
Reads
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277
Citations
Introduction
Sangdong Kim received B.S degrees in School of Electrical and Computer from Hanyang Univ., Korea, in 2004, M.S degrees in Department of Electronic, Communication and Computer Engineering from Hanyang Univ., Korea, in 2006, and the Ph. D. degree in electrical engineering from Kyungpook National Univ., Korea, in 2018. Since 2006, he has been assistant professor and principal researcher in DGIST, Korea. From 2015 to 2016, he was visiting scholar with Univ. of Florida, USA.
Additional affiliations
October 2015 - October 2016
University of Florida
Position
  • Researcher
March 2013 - August 2019
Daegu Gyeongbuk Institute of Science and Technology
Position
  • Senior Researcher
January 2006 - present
Daegu Gyeongbuk Institute of Science and Technology
Position
  • Senior Researcher

Publications

Publications (49)
Article
In this paper, a low complexity joint extrapolation- multiple signal classification (MUSIC) based 2D (two dimensional) parameter estimator is proposed for vital frequency-modulated continuous-wave (FMCW) radar. Recently, FMCW radar, which can detect the distance and vital Doppler information, has been considered for vital non-contact radar. In the...
Article
Full-text available
This letter proposes a joint discrete Fourier transform (DFT)—estimation of signal parameters via rotational invariance techniques (ESPRIT) estimator for time-of-arrival (TOA) and direction-of-arrival (DOA) in vehicle frequency-modulated continuous-wave (FMCW) radars. Since the vehicle FMCW radar should recognize vehicles in the side/rear area when...
Article
Full-text available
We propose a novel discrete Fourier transform (DFT)-based direction of arrival (DOA) estimation by a virtual array extension using simple multiplications for frequency modulated continuous wave (FMCW) radar. DFT-based DOA estimation is usually employed in radar systems because it provides the advantage of low complexity for real-time signal process...
Article
Full-text available
We propose a frequency-modulated continuous wave (FMCW) radar estimation algorithm with high resolution and low complexity. The fast Fourier transform (FFT)-based algorithms and multiple signal classification (MUSIC) algorithms are used as algorithms for estimating target parameters in the FMCW radar systems. FFT-based and MUSIC algorithms have tra...
Article
This paper proposes low-complexity super-resolution detection for range-vital Doppler estimation frequency-modulated continuous wave (FMCW) radar. In regards to vital radar, and in order to estimate joint range and vital Doppler information such as the human heartbeat and respiration, two-dimensional (2D) detection algorithms such as 2D-FFT (fast F...
Article
Full-text available
This paper proposes a high-efficiency super-resolution frequency-modulated continuous-wave (FMCW) radar algorithm based on estimation by fast Fourier transform (FFT). In FMCW radar systems, the maximum number of samples is generally determined by the maximum detectable distance. However, targets are often closer than the maximum detectable distance...
Article
Full-text available
Recently, Doppler radar-based foot gesture recognition has attracted attention as a hands-free tool. Doppler radar-based recognition for various foot gestures is still very challenging. So far, no studies have yet dealt deeply with recognition of various foot gestures based on Doppler radar and a deep learning model. In this paper, we propose a met...
Article
Full-text available
This paper proposes a super-resolution-based direction-of-arrivals (DOA) estimation with wide array distance and extrapolation for vital frequency-modulated continuous-wave (FMCW) radar. Most super-resolution algorithms employ the distance between adjacent arrays of half a wavelength, i.e., λ/2. Meanwhile, in the case of narrow field of view of FMC...
Article
This letter proposes a method of human identification that measures respiration patterns using frequency-modulated continuous wave (FMCW) radar. We exploit the fact that respiration signal patterns are unique to each individual, and FMCW radar is employed to obtain the respiration information. Based on the strengths of FMCW radar, the proposed algo...
Article
Full-text available
This paper proposes a low complexity multiple-signal-classifier (MUSIC)-based direction-of-arrival (DOA) detection algorithm for frequency-modulated continuous-wave (FMCW) vital radars. In order to reduce redundant complexity, the proposed algorithm employs characteristics of distance between adjacent arrays having trade-offs between field of view...
Article
Full-text available
Low-complexity-based reduced-dimension–multiple-signal classification (RD-MUSIC) is proposed with extrapolation for joint time delay of arrivals (TOA) and direction of arrivals (DOA) at automotive frequency-modulated continuous-wave (FMCW) radar systems. When a vehicle is driving on the road, the automotive FMCW radar can estimate the position of m...
Article
Full-text available
A low-complexity joint range and Doppler frequency-modulated continuous wave (FMCW) radar algorithm based on the number of targets is proposed in this paper. This paper introduces two low-complexity FMCW radar algorithms, that is, region of interest (ROI)-based and partial discrete Fourier transform (DFT)-based algorithms. We find the low-complexit...
Conference Paper
In this paper, we developed an integrated mid-range automotive radar system with both blind spot detection (BSD) and lane change assistance (LCA) functions. Integrated automotive radar extends the maximum detection range to 80m with an update time that is within 50ms. By means of ROI preprocessing technique, the computation load of radar signal pro...
Article
Full-text available
This paper proposes an extrapolation-RELAX estimator based on spectrum partitioning (SP) for the direction of arrival (DOA) estimation of frequency-modulated continuous-wave (FMCW) radar. The FMCW radar employs fast Fourier transform (FFT)-based digital beamforming (DBF) for the DOA estimation owing to its low complexity and easy implementation. Ho...
Conference Paper
This paper presents development of 24GHz millimeter wave smart radar for intelligent street lighting system. The developed radar operates at a frequency of 24GHz with 200MHz bandwidth and CW (continuous wave) mode. The two radars are used to cover the street in both directions and detect obstacles moving at the speed of more than 1 km/h including m...
Conference Paper
This paper proposes a vital parameter estimator using LMS (least mean square) and MUSIC (Multiple Signal Classification) for vital FMCW (Frequency Modulated Continuous Wave) radar. In order to estimate the vital parameter for human, vital FMCW radar with high accuracy Doppler frequency is used recently. However, plenty of problems for vital FMCW...
Article
Full-text available
This paper proposes a low-complexity frequency-modulated continuous wave (FMCW) surveillance radar algorithm using random dual chirps in order to overcome the blind-speed problem and reduce the computational complexity. In surveillance radar algorithm, the most widely used moving target indicator (MTI) algorithm is proposed to effectively remove cl...
Article
Full-text available
We propose and implement a low-complexity dual-chirp FMCW radar system for surveillance applications. The FMCW radar is suitable for the detection of various positions of multiple targets for the monitoring of concealed humans. For a surveillance FMCW radar system, it is necessary to distinguish between stationary and moving targets while maintaini...
Article
Full-text available
We propose a low-complexity of joint time delay of arrivals (TOAs) and angles of arrivals (AOAs) using dimension reduction for frequency modulated continuous-wave (FMCW) radar systems. In the road environment, the FMCW radar can obtain the position of other vehicles accurately since the radar system is able to estimate spatial-temporal parameters s...
Article
Full-text available
This paper proposes a low-complexity spectral partitioning (SP) based MUSIC algorithm for automotive radar. For short-range radar (SRR), the range accuracy and resolution of 24 GHz ISM band radar should be improved because the requirements of automotive sensing become more demanding over time. To improve the performance of range estimation, high re...
Article
Full-text available
This paper proposes a low complexity based spectrum partitioning (SP)-ESPRIT for noncontact vital radar as a diagnostic tool for sleep apnea and other respiratory disorders. In the vital radar, the high precision and accuracy of the Doppler frequency is needed for the heart and respiration rates of the human body. However, because of smearing probl...
Article
Full-text available
This letter proposes an effective pre-processing technique for robust estimation of signal parameters via rotational invariance techniques (ESPRIT)-based single-tone frequency estimation against an I/Q mismatch. For the implementation of a high-accuracy ranging/radar system, parametric-based algorithms such as MUSIC, ESPRIT and their variations hav...
Article
Full-text available
Ramp-sequence based frequency modulated continuous wave (FMCW) radar is effective in detecting the range and velocity of a target. However, because the target detection algorithm is based on a two-step fast Fourier transform (FFT) over several pulse-repetition intervals (PRIs), a significant amount of data must be processed in order to detect the r...
Article
Full-text available
The design of a hybrid pulse generator that supports a variable pulse width and a pulse repetition interval (PRI) is proposed and demonstrated for an ultra-wide band (UWB) pulse-Doppler radar. UWB pulse-Doppler radar is required for implementing full digital systems for reliability and flexibility regardless of temperature. It is difficult to apply...
Article
Full-text available
This article presents a hybrid digital and RF front-end module (FEM) of a 24-GHz pulse-Doppler radar system for intelligent transport system applications. The conventional pulse generators use analog components such as step recovery diode. It is difficult to control the parameters of the pulse. In addition, the heterodyne architecture based transce...
Article
We propose a new fine Doppler frequency estimator using two fast Fourier transform (FFT) samples for pulse Doppler radar that offers highly sensitive detection and a high resolution of velocity. The procedure of fine Doppler frequency estimation is completed through coarse frequency estimation (CFE) and fine frequency estimation (FFE) steps. During...
Article
Full-text available
In this paper, we suggest efficient structures of radar in order to reduce the hardware complexity associated with UWB radar. The conventional type of pulse Doppler radar should be computing by the fast Fourier transform (FFT) of all range gates independently in order to analyze the characteristics of the Doppler signals. We observe that this metho...
Article
In this paper, we design the signal processing module based on FPGA for vehicle FMCW radar systems. We employ the detection algorithms based on two-step FFT (Fast Fourier Transform) using the several fast ramps in order to resolve radar range-velocity ambiguities. We implement the detection algorithms including the first FFT, DBF (Digital Beam Form...
Article
Full-text available
In this paper, we propose a memory-efficient structure for a pulse Doppler radar in order to reduce the hardware's complexity. The conventional pulse Doppler radar is computed by fast frequency transform (FFT) of all range cells in order to extract the velocity of targets. We observed that this method requires a huge amount of memory to perform the...
Article
This paper analyzes the detection probability of FMCW-UWB radar based on Doppler frequency and ADC bit for oil tank level gauge. The FMCW-UWB radar system consists of a transmitted part and a received part and uses an additive white Gaussian noise (AWGN) channel. The system model is verified through analysis and simulation. The performance degradat...
Article
To improve road safety and realize intelligent transportation, Ultra-Wideband (UWB) radars sensor in the 24 GHz domain are currently under development for many automotive applications. Automotive UWB radar sensor must be small, require low power and inexpensive. By employing a direct conversion receiver, automotive UWB radar sensor is able to meet...
Article
In this paper, we design and implement a digital impulse generator using a DCM block and an OSERDES block for a 24GHz UWB impulse-Doppler radar. The Federal Communications Commission (FCC) has confirmed the spectrum from 22 to 29GHz for UWB radar with a limit power of -41.3dBm/MHz. UWB signal possesses an absolute bandwidth larger than 500MHz or a...
Article
This paper proposes UWB radar receiver architecture based on range gates. We analyze the detection probability of UWB radar based on range gates according to the timing jitter and ADC resolution for ITS. The UWB radar based on range gates consists of a transmitted part and a received part, and uses a coherent integration and coherent threshold dete...
Article
In this paper, we design and implement a full-digital pulse-Doppler radar system for automotive applications. After designing and implementing the pulse-Doppler radar-based FPGA and DSP platform, we also verify the 24-GHz pulse-Doppler radar system by constructing an experimental environment that includes one moving target and two stationary target...
Article
This paper analyzes the detection probability of FMCW (Frequency Modulated Continuous Wave) radar based on Doppler frequency and analog-digital converter bit and designs and implements signal processing part of FMCW radar. For performance evaluation, the FMCW radar system consists of a transmitted part and a received part and uses AWGN channel. The...
Conference Paper
This paper analyzes the detection probability of LFM-UWB radar based on Doppler frequency. The LFM-UWB radar system consists of a transmitted part and a received part and uses AWGN channel. The system model is verified through analysis and simulation. Frequency offset occurs in the received part caused by the mismatching between the received signal...
Conference Paper
Most significant part of radar target detection problems can be solved by using the method of statistical detection theory. Here the objective of the proposed optimal detection algorithm is to give a maximum detection probability for fixed false alarm probability. It is assumed that target is stationary and energy reflected from the target is distr...
Article
Full-text available
This paper analyzes the detection performance of new Transmitted-Reference (TR) automotive UWB radar using unequaled amplitude for vehicles. To improve the detection performance of a traditional TR-UWB system, the amplitude of a reference pulse can be changed to increase the energy-to-noise ratio. Finally, the characteristics of the proposed TR-UWB...
Conference Paper
Full-text available
The characteristics of ultra-wideband (UWB) channels in vehicular environments are explored. A set of propagation measurements were conducted on roadways and in underground parking garages and the resulting propagation data consists of approximately 1,200 multipath profiles. The channel impulse responses are estimated from the measured data using g...
Conference Paper
In this paper, the proposed technique can provide the range profile with adaptive range resolution for automotive frequency modulation continuous wave (FMCW radar.) For long-distance targets, the range is extracted with rough resolution using the basic FFT. The high resolution algorithm is used for near-distance targets, for which the collision pro...
Article
This paper analyzes the performance of a proposed Transmitted-Reference (TR) UWB radar system for vehicles. To improve the detection performance of the previous TR-UWB system, the amplitude of a reference pulse can be changed to order to increase the energy-to-noise ratio. Finally, the characteristics of the proposed TR-UWB system are evaluated by...
Conference Paper
Full-text available
This paper analyzes the performance of UWB radar for vehicle in multi-user environments. To evaluate the probability of detection in UWB vehicular radar under a multi-user environment, we use the transmitter and receiver architecture of UWB radar system model. The system model consists of three major parts: a transmitter, multi-path channel and a r...
Article
This paper presents the technology trend of various active safety systems for vehicle. The safety system is applied to various industry fields and is expected to be spread all over the market. So far, good examples of the developed active safety systems are ACC(Adaptive Cruise Control), CMS(Collision Mitigation Systems) and APSS(Active Pedestrian S...
Conference Paper
The paper provides accuracy improvement of asynchronous UWB position location algorithm using multiple pulse transmission. We eliminate inter symbol interference by increasing time duration between consecutive pulses, and to reduce AWGN noise we transmitted sufficient number of pulses. At the receiver side we averaged signal over time, and performe...

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