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GPS 의사거리-반송파 위상 측정치의 고장검출을 위한 임계값 결정 연구
손은성,김군택,임성혁,이은성,허문범,남기욱,Son, Eunseong,Kim, Koon-Tack,Im, Sung-Hyuck,Lee, Eun-Sung,Heo, Moon Beom,Nam, Gi-Wook 한국항공운항학회 2016 한국항공운항학회지 Vol.24 No.1
In this study, The code-carrier divergence test was applied to GPS measurements, and the results were compared and analyzed. The GPS data used for the threshold determination were obtained from Global Navigation Satellite System permanent stations built by the Korea Aerospace Research Institute. At each permanent station, identical dual-frequency receiver and choke ring antenna with radome are installed. The analysis method, root mean square values were compared and analyzed for each permanent station and satellite. As a result, the root mean square value generally decreased as the satellite elevation angle increased although the trend was gentle. Threshold were finally selected based on the average and standard deviation of root mean square for each permanent station. For improving of availability and continuity in real-time operation when the threshold is over the limits, Code-Carrier divergence test values are initialized.
차분 기법을 적용한 GPS 반송파 위상 측정치 고장 검사
손은성 ( Eunseong Son ),임성혁 ( Sung-hyuck Im ),김군택 ( Koon-tack Kim ) 한국항행학회 2017 韓國航行學會論文誌 Vol.21 No.6
이 연구에서는 GNSS (global navigation satellite system) 인프라 기반 측위 보정정보 생성을 위한 전처리 단계인 GPS (global positioning system) 반송파 위상 측정치의 고장 검사를 수행하였다. 기존 CARST (carrier acceleration ramp step test) 방법은 수신기 시계 오차를 제거하기 위해 평균값을 이용함으로써 검사 대상에 영향을 준다. 따라서 이 연구에서는 차분 기법을 적용하여 기존 CARST 결과와 비교하였다. 실 데이터에 인위적인 고장을 인가하여 고장 시뮬레이션을 수행한 결과 차분 기법을 적용할 경우 각각의 위성에 대해 독립적인 고장 검출이 가능한 것으로 판단되었으며 단일차분과 이중차분은 유사한 결과를 나타내었다. 실 데이터를 이용하여 기존의 방법과 비교한 결과 위성 간 차분, 수신국간 차분 결과의 장단점을 확인할 수 있었다. 그러나 결과 값에 대한 위성 및 수신기 시계 오차의 영향은 추가적인 분석이 필요할 것으로 판단된다. This study performed fault test on global positoining system (GPS) carrier phase measurements, which is a preprocessing step to generate the positioning correction information based on the global navigation satellite system (GNSS) infrastructure. The existing carrier acceleration ramp step test (CARST) method affects the test result by using the mean value to eliminate the receiver clock error. In this regard, this study applied differencing and compared its results with those of the existing CARST. The fault simulation that applied artificial faults to the actual data found that the fault could be detected independently on each satellite when difference method was applied, and the single difference CARST and the double difference CARST produced similar results. The comparison with the existing method using actual data demonstrated the strengths and weaknesses of satellite and station single difference. Nevertheless, it is our understanding that it would require an additional analysis to determine whether the results were affected by the satellite or receiver clock error.
육상교통 항법을 위한 네트워크기반 위성항법보정 시스템의 구성
손민혁,손은성,이은성,허문범,남기욱,Son, Minhyuk,Son, Eunseong,Lee, Eunsung,Heo, Moon-Beom,Nam, Gi-Wook 한국항공운항학회 2013 한국항공운항학회지 Vol.21 No.4
In this paper, a configuration procedure of a transportation infrastructure system for GNSS based very precise real-time positioning is proposed. This infrastructure system consists of several receiving station, a central station, and communication sub-systems. The required performance, design, implementation and verification of each sub-system are explained respectively. The required performance can be broken down into accuracy, integrity, stability, processing time. The design of the each sub-system is performed in accordance with the required performance and each sub-system is built with regard to the design. Lastly the implemented system is verified in comparison with the required performance.
임성혁(Im, Sunghyuck),안종선(An, Jongseon),손은성(Son, Eunseong),이상우(Lee, Sangwoo),허문범(Heo, Moonbeom) 한국항공우주연구원 2017 항공우주산업기술동향 Vol.15 No.1
자동차는 인간의 삶에서 필수적인 도구이다. 하지만 복잡한 교통으로 인해 자동차를 운전하기 위해 소비하는 시간과 노령화에 따른 노인운전자의 증가는 편의와 안전이라는 부분에서 자동차의 효용성을 저하시키고 안전도를 위협하고 있다. 이를 극복하기 위해 자율주행자동차 기술이 개발되고 있고 일부 자율주행단계는 상용화되고 있는 상황이다. 본 논문에서는 현재 자율주행 및 위성항법 기술 현황에 대해 설명하고 자율주행에의 위성항법 적용사례에 대해 서술하였다. With the need of transport and mobilities, cities have evolved to be more and more automobile dependent. Although such changes have made our lives more comfortable, the safety issue is now raising new questions due to the significant increase of elderly drivers and traffic congestion. To overcome these problems, autonomous vehicle technologies are being introduced and emphasized, and efforts to adopt the innovative technologies in the industry and commercial sectors are also increasing. In this paper, we review the current status of autonomous vehicle technology and satellite navigation technology, along with examples where the satellite navigation is applied for autonomous vehicles.