• Journal of Positioning, Navigation, and Timing
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• 제5권3호
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• pp.119-129
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• 2016

This paper presents an integrated navigation system for accurate navigation solution-based safety and convenience services in the vehicular augmented reality (AR)-head up display (HUD) system. For lane-level guidance service, especially, an accurate navigation system is essential. To achieve this, an inertial navigation system (INS)/global positioning system (GPS)/vision/digital map (IGVM) integrated navigation system has been developing. In this paper, the concept of the integrated navigation system is introduced and is implemented based on a multi-model switching filter and vehicle status decided by using the GPS data and inertial measurement unit (IMU) measurements. The performance of the implemented navigation system is verified experimentally.

• 한국ITS학회 논문지
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• 제16권5호
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• pp.1-11
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• 2017

국내 육상교통망의 중추적인 역할을 하는 고속도로는 $7{\times}9$ 형태로 양적, 질적 성장을 거듭하고 있다. 점차 복잡해지는 고속도로 기하구조에 대응하고자 차로유도선을 설치하여 운전자들의 보다 원활한 차로 변경을 유도하고 있으나 해당 시설의 설치기준이 부재하고, 그 효과 검증 또한 제한적으로 시행되고 있는 실정이다. 본 연구는 도로주행 시뮬레이터를 활용하여 주행안전성 측면에서 차로유도선의 효과를 재조명하고, 적정 연장 설치기준을 수립하는데 주된 초점을 맞추고 있다. 이를 위해, 피험자의 선호도를 조사하고, 가상의 주행환경에서 운전자의 차로 변경 행태를 분석하였다. 또한, 피험자가 차로변경 시 느끼는 편안함 정도를 계량화하기 위해 뇌파분석을 실시하였고, 도출된 결과에 대한 통계적 검증을 수행하였다. 본 연구는 차로유도선 설치기준 수립 시 기반자료로 활용될 것으로 기대한다.

• 한국도로학회논문집
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• 제18권3호
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• pp.87-94
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• 2016

PURPOSES : This study analyzed the lane-by-lane traffic flow characteristics in Korea by using real-world data, including congestion levels, for 2-, 3-, and 4-lane freeways. METHODS : On the basis of a literature review, lane flow and speed characteristics were analyzed using flow measurements and speed ratios. In addition, the effect of congestion levels on traffic flow were visualized using rescaled cumulative plots. RESULTS : Driver behavior varied depending on the congestion level. During free-flow conditions, the lane-use ratio of individual lanes varied largely, whereas during congestion, the ratio was nearly the same for all lanes (i.e., equilibrium). During maximum-flow and congestion conditions, the median lane was used more than the shoulder lane, whereas during all other conditions, the shoulder lane had a higher lane-use ratio. In 3- or 4-lane freeways, the lane-use ratio of the median lane always exceeded 1 and was the highest during free-flow conditions. CONCLUSIONS : The results of the present analysis can be used as an index to predict congestion before a lane is overcapacitated. Moreover, the results can be applied in variable lane guidance systems, such as car navigation systems and variable message displays, to control traffic flow.

• 한국자동차공학회논문집
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• 제20권4호
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• pp.16-24
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• 2012

This paper proposes a method utilizing Differential Global Position System (DGPS) with Real-Time Kinematic (RTK) and pre-built Geo-graphic Information System (GIS) to detect lane departure of a vehicle. The position of a vehicle measured by DGPS with RTK has 18 cm-level accuracy. The preconditioned GIS data giving accurate position information of the traffic lanes is used to set up coordinate system and to enable fast calculation of the relative position of the vehicle within the traffic lanes. This relative position can be used for safe driving by preventing the vehicle from departing lane carelessly. The proposed system can be a key component in functions such as vehicle guidance, driver alert and assistance, and the smart highway that eventually enables autonomous driving supporting system. Experimental results show the ability of the system to meet the accuracy and robustness to detect lane departure of a vehicle at high speed.