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한반도 기상데이터를 이용한 지상항법 대류권 지연 오차 보상기법
소형민,이기훈,박준표,So, Hyoungmin,Lee, Kihoon,Park, Junpyo 한국군사과학기술학회 2016 한국군사과학기술학회지 Vol.19 No.2
Tropospheric delay is one of the largest error source in pseudolite navigation system. Because a pseudolite is installed on the ground and transmits its signal to a user in the air or on the ground, the conventional tropospheric delay model developed for a satellite navigation doesn't work properly. In this paper, performance analysis of several pseudolite tropospheric delay models has been done using meteorological data. Based on the result, a new compensation method for Hopfield model has been proposed.
소형민 ( Hyoungmin So ) 한국항행학회 2016 韓國航行學會論文誌 Vol.20 No.5
GPS P(Y) 코드와 같은 암호화 항법 신호원은 재생이 불가능하므로 기만에 강건하다. 하지만 암호화 신호원을 이용하기 위해서는 위성항법시스템 운용국가로부터 허가를 얻어야 하고 이용에 있어서도 상당한 제약이 따른다. 본 논문에서는 고이득 지향성 안테나를 이용하는 지상 기준국과 일반 위성항법 사용자를 모의하였다. 지상 기준국은 특정 항법위성에 대한 고이득 신호로부터 해당 위성이 방송하는 암호화 신호 코드를 복조하였다. 복조된 암호화 신호코드는 사용자 수신기 모의 데이터의 이상여부를 판단하고, 기만여부를 판단할 수 있었다. 본 논문은 이와 같은 방식을 적용하는 기만검출 기법을 제안하고 GPS 시뮬레이터를 이용한 모의분석 결과를 다룬다. It is well known that the encrypted ranging signal, such as GPS P(Y) code, is immune to spoofing attack. However, in order for users to use the signal, there needs permission from the operator. And also there are many restrictions for use because of security issues. In this paper, a ground reference station equipped with high-gain directional antenna and a user receiver were simulated. In the reference station, the encrypted code can be demodulated from the high-gain signal. And then the code can be used to detect spoofing attack in the user receiver. This paper proposes the spoofing detection method using the encrypted signal and deals with simulation results.
GPS/DME 통합항법시스템에서 전파고도계의 효과적인 사용
구문석,소형민,오상헌,황동환,Koo, Moonsuk,So, Hyoungmin,Oh, Sang Heon,Hwang, Dong-Hwan 한국군사과학기술학회 2016 한국군사과학기술학회지 Vol.19 No.2
Many researches on use of local ground navigation systems can be found to overcome vulnerability of GNSS. Effective use of an altimeter is proposed in GNSS/DME integrated navigation systems. A weighted DOP based on statistics of measurement error is derived for a given vehicle motion trajectory. From the derived DOP, the vertical error is estimated. By comparing the estimated vertical error with error specification of the altimeter, use of the altimeter is determined in the GPS/DME integrated navigation systems. In order to show effectiveness of the proposed method, 50 times Monte-Carlo simulations were performed for a GPS/DME integrated navigation system. The results show that the proposed method gives more accurate navigation outputs when the number of GPS satellites in view varies.
구문석,김영준,최광호,소형민,오상헌,김성철,이형근,황동환,Koo, Moonsuk,Kim, YoungJoon,Choi, Kwang-Ho,So, Hyoungmin,Oh, Sang Heon,Kim, Seong-Cheol,Lee, Hyung-Keun,Hwang, Dong-Hwan 한국군사과학기술학회 2015 한국군사과학기술학회지 Vol.18 No.5
Even though GNSS provides highly accurate navigation information all over the world, it is vulnerable to jamming in the electronic warfare due to its weak signal power. The United States and Korea have plans to use terrestrial navigation systems as back-up systems during outage of GNSS. In order to develop back-up systems of GNSS, an M&S software platform is necessary for performance evaluation of various vehicle trajectories and integrated navigation systems. In this paper a design method of an M&S software is proposed for evaluation of multiple radio positioning integration systems. The proposed M&S software consists of a navigation environment generation part, a navigation algorithm part, a GUI part and a coverage analysis part. Effectiveness of the proposed design method is shown by implementing an M&S software for the GPS, DME and eLoran navigation systems.