GPS 실시간 구조물 모니터링을 위한 반송파 관측데이터 순간미지정수 결정

이흥규,Lee, Hungkyu 대한토목학회 2014 대한토목학회논문집 Vol.34 No.1

GPS 반송파를 사용하여 센티미터 수준 정확도의 동적 측위를 위해서는 반송파 관측데이터에 포함하고 있는 미지정수를 결정하여 정밀한 기하거리로 환산하는 것이 필수적이다. 본 논문에서는 GPS에 의한 실시간 구조물 모니터링에 효율적으로 적용가능한 반송파 관측데이터 순간미지정수 결정 성능향상을 위한 알고리즘을 연구하였다. 이를 위하여 구조물에 설치한 GPS 수신기 이동 범위와 그 네트워크를 수학적으로 모형화하고 '정수제약 최소제곱법'을 통해 정확한 위치를 추정하는 절차를 제안하였다. 이 절차에는 추정해의 신뢰성 향상을 위해 실수해의 과대오차 최소화에 필요한 품질제어와 기하적 구속조건을 이용한 미지정수 타당성 검정을 포함하고 있다. 제안된 순간미지정수 결정절차를 과학기술용 계산용 소프트웨어인 MATLAB에 의해 실시간 적용 가능하도록 구현하고 장대교량에 해당하는 사장교 현장 관측데이터를 처리하여, 그 성능을 미지정수결정 성공률, 통계모형의 영향 그리고 연산시간에 대해 분석하고 결과를 요약하였다. In order to deliver a centimeter-level kinematic positioning solution with GPS carrier-phase measurements, it is prerequisite to use correctly resolved integer ambiguities. Based on the mathematical modeling of GPS network with application of its geometrical constraints, this research has investigated an instantaneous ambiguity resolution procedure for the so-called 'integer constrained least-squares' technique which can be effectively implemented in real-time structure monitoring. In this process, algorithms of quality control for the float solutions and hypothesis tests using the constrained baseline for the ambiguity validation are included to enhance reliability of the solutions. The proposed procedure has been implemented by MATLAB, the language of technical computing, and processed field trial data obtained at a cable-stayed bridge to access its real-world applicability. The results are summarized in terms of ambiguity successful rates, impact of the stochastical models, and computation time to demonstrate performance of the instantaneous ambiguity resolution proposed.

교량의 실시간 거동 모니터링을 위한 GPS의 적용

박운용,정성모,곽두호,이흥규 東亞大學校 大學院 1999 大學院論文集 Vol.24 No.-

Real Time Kinematic GPS will allow a multitude of monitoring, navigation and engineering applications. Applications inclued real time deformation and movement monitoring and real time automated plant control. In a low dynamic environment, with a short baseline length, it is possible to position a roving receiver to an approximate accuracy of less than 5mm within a few seconds of thestart of the ambiguity. One Engineering application is the monitoring of the movement of cable suspension bridges. Such structures are capable of movements of up to a few meters under adverse wind conditions or heavy traffic loads. The use of relative OTF positioing at strategic points upon the bridge would allow close monitoring of the bridge's movements and calculate deformation and long-term deterioration factors for the bridge. Future bridge designs and traffic management schemes could also benefit from the monitoring system.

수치시험을 통한 횡원통 상사 투영함수 비교 연구

이흥규,서완수 한국측량학회 2013 한국측량학회지 Vol.30 No.2

The transverse cylindrical projection has been used in Korea since 1910s when the nationwide geodeticnetwork was firstly established. However, the projection has a number of different types of functions accordingto a way of its mathematical derivation as well as a section of its coefficients and terms, for instance G auss-Schreiber(GS) and Gauss-Krüger(GK) types. Although the transverse cylindrical projection itself is assigned toa system, projected coordinates would be diverse with respect to the function used in the actual calculation. Inorder to investigate impact of functions used in the computation, five different equations (i.e., 2 GS and 3 GK)were implemented in this study by using MATLAB. A series of numerical simulation tests has been carriedout to compare and characterize them in terms of projection accuracy, difference of projected coordinates anddistortion. Furthermore, a comparison between GS and GK function was made under the Korean griddingsystem, consisting of four zones. Results from the numerical computations were qualitatively analyzed andsummarized in this paper. 우리나라는 1910년대 토지조사사업에서 설정된 횡원통상사투영법을 사용하고 있다. 그러나 이 투영법은 수학적유도 방법과 절차에 따라 다른 형태의 투영함수가 존재하며, 대표적인 것이 측지 및 공공측량에 사용하는 Gauss-Krüger(GK) 함수와 지적 분야의 Gauss-Schreiber(GS) 함수이다. 또한 이들 함수들은 실제 전산 구현 방법과 계수선택에 따라 그 형태의 차이가 있어 투영변환 계산 결과에 영향을 미친다. 본 연구에서는 횡원통상사투영의 GS 계열 2가지와 3가지 GK 정·역변환 함수를 과학기술계산용 소프트웨어인 MATLAB에 의해 구현하고, 이들 특성 비교를 위한 다양한 수치시험을 수행 하였다. 그 결과를 바탕으로 투영 범위에 따른 투영함수의 정확도, 변환좌표의 차이, 축척계수에 의한 왜곡 특성을 분석 하였다. 이와 함께 4계로 이루어진 투영체계에 대해 GS 및 GK 함수를 통해투영변환을 실시하고, 좌표의 일치성 및 투영 면적왜곡을 정량적으로 분석하여 그 결과를 요약하였다.

재활용 가능한 비가교형 전력케이블용 대체 절연재 기술 소개 및 향후 전력케이블 절연재 기술개발 전망과 과제

이흥규,강성화,임기조,Lee, Heung-Gyu,Gang, Seong-Hwa,Im, Gi-Jo 한국전기전자재료학회 2011 전기전자재료 Vol.24 No.12

Experimental Analysis of Kinematic Network-Based GPS Positioning Technique for River Bathymetric Survey

이흥규,이재원,김현도 사단법인 항법시스템학회 2016 Journal of Positioning, Navigation, and Timing Vol.5 No.4

This paper deals with performance assessment of the kinematic network-based GPS positioning technique with a view to using it for ellipsoidally referenced bathymetric surveys. To this end, two field trials were carried out on a land vehicle and a surveying vessel. Single-frequency GPS data acquired from these tests were processed by an in-house software which equips the network modeling algorithm with instantaneous ambiguity resolution procedure. The results reveals that ambiguity success rate based on the network model is mostly higher than 99.0%, which is superior to that of the single-baseline model. In addition, achievable accuracy of the technique was accessed at ±1.6 cm and 2.7 cm with 95% confidence level in horizontal and vertical component respectively. From bathymetric survey at the West Nakdong River in Busan, Korea, 3-D coordinates of 2,011 points on its bed were computed by using GPS-derived coordinates, attitude, measured depth and geoid undulation. Note that their vertical coordinates are aligned to the geoid, the so-called orthometric height which is widely adopted in river engineering. Bathymetry was constructed by interpolating the coordinate set, and some discussion on its benefit was given at the end.

이종금속전극이 증착된 XLPE필름의 전기전도 특성

이흥규,이운영,임기조,김용주,Lee, Heung-Gyu,Lee, Un-Yeong,Im, Gi-Jo,Kim, Yong-Ju 대한전기학회 1999 전기학회논문지C Vol.48 No.8

Electrical conduction characteristics of XLPE film evaporated with different metal electrode are discussed. The relation between electrical current(I) and Voltage(V) in the M(metal)-I(XLPE)-M(metal) structure are measured in the temperature range from 25$[^{\circ}C]$ to 90[$[^{\circ}C]$ . Several kinds of metals are used as electrode, such as, Al, Ag and Cu.From the experimental results, it is conclused that the conduction mechanism at highelectric field is SCLC. The dependences of temperature and kinds of metal on the trap filled electric field level can be well explained by this theory.

CO-ME의 소개

이흥규,Lee, H.K. 대한설비공학회 1994 설비저널 Vol.23 No.3

Retrieval and Analysis of Integrated Water Vapor from Precise GPS Data Processing at IEODO Ocean Research Station

이흥규,Musa, Tajul Ariffin,최윤수,윤하수,이동인 한국측량학회 2015 한국측량학회지 Vol.33 No.6

This paper deals with the retrieval of integrated water vapor (IWV) from the zenith tropospheric delay estimated by precisely processing GPS observations at IEODO ocean research station in the East China Sea. A comparison of GPS-IWV with the radiosonde profiling from June and November in 2014 was made to confirm the method and the procedure, adopted for the IWV determination. A series of analysis of these IWV values was performed to capture characteristics of their seasonal and diurnal variations. Furthermore, the troposphere around the ocean research station during typhoon events was spatiotemporally analyzed by including thirteen GPS sites over the Korean Peninsula, indicating correlation between the typhoon location and the tropospheric density.

Extended Temporal Ordinal Measurement Using Spatially Normalized Mean for Video Copy Detection

이흥규,김준 한국전자통신연구원 2010 ETRI Journal Vol.32 No.3

This letter proposes a robust feature extraction method using a spatially normalized mean for temporal ordinal measurement. Before computing a rank matrix from the mean values of non-overlapped blocks, each block mean is normalized so that it obeys the invariance property against linear additive and subtractive noise effects and is insensitive against multiplied and divided noise effects. Then, the temporal ordinal measures of spatially normalized mean values are computed for the feature matching. The performance of the proposed method showed about 95% accuracy in both precision and recall rates on various distortion environments, which represents the 2.7% higher performance on average compared to the temporal ordinal measurement.

Wavelet 변화을 이용한 우리별 수신영상 압축기법

이흥규,김성환,김경숙,최순달 한국우주과학회 1996 Journal of Astronomy and Space Sciences Vol.13 No.2