44 citations · 469 across the 27 of their papers we have counts for
27 papers
Rigidity-Based Multi-UAV Trajectory Optimization for Rapid Cooperative Emergency Target Localization
Halim Lee, Jiwon Seo
Reducing the response time for accurate emergency-caller localization is critical in vehicular and public-safety networks. Although mobile devices commonly use GNSS, Wi-Fi, or cell…
Low-Cost GNSS Simulators with Wireless Clock Synchronization for Indoor Positioning
Woohyun Kim, Jiwon Seo
In regions where global navigation satellite systems (GNSS) signals are unavailable, such as underground areas and tunnels, GNSS simulators can be deployed for transmitting simulat…
Machine-Learning-Based Classification of GPS Signal Reception Conditions Using a Dual-Polarized Antenna in Urban Areas
Sanghyun Kim, Jiwon Seo
In urban areas, dense buildings frequently block and reflect global positioning system (GPS) signals, resulting in the reception of a few visible satellites with many multipath sig…
Performance Comparison of Numerical Optimization Algorithms for RSS-TOA-Based Target Localization
Halim Lee, Jiwon Seo
The maximum likelihood (ML) estimator can be applied to localize a target mobile device using the RSS and TOA. However, the ML estimator for the RSS-TOA-based target localization p…
Performance Evaluation and Hybrid Application of the Greedy and Predictive UAV Trajectory Optimization Methods for Localizing a Target Mobile Device
Halim Lee, Jiwon Seo
This study investigates unmanned aerial vehicle (UAV) trajectory planning strategies for localizing a target mobile device in emergency situations. The global navigation satellite…
Urban Road Safety Prediction: A Satellite Navigation Perspective
Halim Lee, Jiwon Seo, Zaher M. Kassas
Predicting the safety of urban roads for navigation via global navigation satellite systems (GNSS) signals is considered. To ensure safe driving of automated vehicles, the vehicle…
Evaluation of RF Fingerprinting-Aided RSS-Based Target Localization for Emergency Response
Halim Lee, Taewon Kang, Suhui Jeong +1
Target localization is essential for emergency dispatching situations. Maximum likelihood estimation (MLE) methods are widely used to estimate the target position based on the rece…
Seamless Accurate Positioning in Deep Urban Area based on Mode Switching Between DGNSS and Multipath Mitigation Positioning
Yongjun Lee, Yoola Hwang, Jae Young Ahn +2
Multipath and non-line-of-sight (NLOS) signals are the major causes of poor accuracy of a global navigation satellite system (GNSS) in urban areas. Despite the wide usage of the GN…
Optimal Parameter Inflation to Enhance the Availability of Single-Frequency GBAS for Intelligent Air Transportation
Halim Lee, Sam Pullen, Jiyun Lee +3
Ground-based Augmentation System (GBAS) augments Global Navigation Satellite Systems (GNSS) to support the precision approach and landing of aircraft. To guarantee integrity, exist…
SFOL DME Pulse Shaping Through Digital Predistortion for High-Accuracy DME
Sunghwa Lee, Euiho Kim, Jiwon Seo
The Stretched-FrOnt-Leg (SFOL) pulse is a high-accuracy distance measuring equipment (DME) pulse developed to support alternative positioning and navigation for aircraft during glo…
Fast User Adaptation for Human Motion Prediction in Physical Human-Robot Interaction
Hee-Seung Moon, Jiwon Seo
Accurate prediction of human movements is required to enhance the efficiency of physical human-robot interaction. Behavioral differences across various users are crucial factors th…
First Demonstration of the Korean eLoran Accuracy in a Narrow Waterway Using Improved ASF Maps
Woohyun Kim, Pyo-Woong Son, Sul Gee Park +2
The vulnerabilities of global navigation satellite systems (GNSSs) to radio frequency jamming and spoofing have attracted significant research attention. In particular, the large-s…
Enhanced Accuracy Simulator for a Future Korean Nationwide eLoran System
Joon Hyo Rhee, Sanghyun Kim, Pyo-Woong Son +1
The Global Positioning System (GPS) has become the most widely used positioning, navigation, and timing system. However, the vulnerability of GPS to radio frequency interference ha…
Optimal Action-based or User Prediction-based Haptic Guidance: Can You Do Even Better?
Hee-Seung Moon, Jiwon Seo
The recently advanced robotics technology enables robots to assist users in their daily lives. Haptic guidance (HG) improves users' task performance through physical interaction be…
Single-Antenna-Based GPS Antijamming Method Exploiting Polarization Diversity
Kwansik Park, Jiwon Seo
The vulnerability of Global Positioning System (GPS) receivers to jammers is a major concern owing to the extremely weak received signal power of GPS. Researches have been conducte…
Integrity-Based Path Planning Strategy for Urban Autonomous Vehicular Navigation Using GPS and Cellular Signals
Halim Lee, Jiwon Seo, Zaher M. Kassas
An integrity-based path planning strategy for autonomous ground vehicle (AGV) navigation in urban environments is developed. The vehicle is assumed to navigate by utilizing cellula…
RSS-based LTE Base Station Localization Using Single Receiver in Environment with Unknown Path-Loss Exponent
Suhui Jeong, Halim Lee, Taewon Kang +1
With the increasing demand for location-based services, localization technology research has recently intensified. Received signal strength (RSS)-based localization has the advanta…
A Preliminary Study of Machine-Learning-Based Ranging with LTE Channel Impulse Response in Multipath Environment
Halim Lee, Jiwon Seo
Alternative navigation technology to global navigation satellite systems (GNSSs) is required for unmanned ground vehicles (UGVs) in multipath environments (such as urban areas). In…
Neural Network-Based Ranging with LTE Channel Impulse Response for Localization in Indoor Environments
Halim Lee, Ali A. Abdallah, Jongmin Park +2
A neural network (NN)-based approach for indoor localization via cellular long-term evolution (LTE) signals is proposed. The approach estimates, from the channel impulse response (…
Effect of Outlier Removal from Temporal ASF Corrections on Multichain Loran Positioning Accuracy
Jongmin Park, Pyo-Woong Son, Woohyun Kim +2
The widely used global navigation satellite systems (GNSSs) are vulnerable to radio frequency interference (RFI). Long-range navigation (Loran), a terrestrial navigation system, ca…
Effects of Initial Attitude Estimation Errors on Loosely Coupled Smartphone GPS/IMU Integration System
Kwansik Park, Woohyun Kim, Jiwon Seo
Global Positioning System (GPS) and inertial measurement unit (IMU) sensors are commonly integrated using the extended Kalman filter (EKF), for achieving better navigation performa…
Development of Record and Management Software for GPS/Loran Measurements
Woohyun Kim, Pyo-Woong Son, Joon Hyo Rhee +1
In this paper, a software implementation that records Global Positioning System (GPS) and long-range navigation (Loran) measurement data output from an integrated GPS/Loran receive…
Motion Planning by Reinforcement Learning for an Unmanned Aerial Vehicle in Virtual Open Space with Static Obstacles
Sanghyun Kim, Jongmin Park, Jae-Kwan Yun +1
In this study, we applied reinforcement learning based on the proximal policy optimization algorithm to perform motion planning for an unmanned aerial vehicle (UAV) in an open spac…
Practical Simplified Indoor Multiwall Path-Loss Model
Taewon Kang, Jiwon Seo
Over the past few decades, attempts had been made to build a suitable channel prediction model to optimize radio transmission systems. It is particularly essential to predict the p…