• 전기학회논문지
• /
• 제60권12호
• /
• pp.2326-2332
• /
• 2011

eLoran is enhanced Loran-C and eLoran is researched for as GPS backup system because this system is resistant to signal interference and has high accuracy. TOA measurements of eLoran include errors proportional to the range such as PF, SF, ASF and EF. Therefore these error factors must be compensated for improved accuracy of position. Generally, error models or GPS aided compensation methods are used, but these methods are limited by lack of infrastructure or system performance. Therefore, this paper proposes new model of error factors included in eLoran TOA measurements and navigation algorithm using this model. Error factors in this model are sum of a certain size of error and error proportional to the range. And feasibility and performance of proposed navigation algorithm are verified by using raw measurements.

• 한국항해항만학회:학술대회논문집
• /
• 한국항해항만학회 2005년도 추계학술대회 논문집
• /
• pp.163-168
• /
• 2005

LORAN-C 는 유일하게 남아있는 지상파 항법시스템으로서 현재 전세계적인 체인을 형성하고 있으며, 우리나라에서는 GRI 9930의 코리아 체인(주국 : 포항, 종국 : 광주, 게사시, 니지마, 우스리스크)을 운영하고 있다. 그러나 LORAN-C는 사용자의 감소 및 시설의 노후화로 인하여 현재 미국에서는 새로운 시스템으로의 개선을 모색하고 있는 중이다. 이와 관련하여 국제적인 추세와 정책방향을 분석하고 기술개발 상황을 파악하여 우리나라의 LORAN-C에 대한 정책방향을 수립하는 것이 현재 절실히 필요한 시점이다. 본 연구에서는 우리나라 LORAN-C 현황 및 국제적인 동향 및 기술개발 상황을 파악하여 우리나라의 향후 LORAN-C에 대한 정책수립 방향을 제안한다.

• Journal of Positioning, Navigation, and Timing
• /
• 제7권2호
• /
• pp.73-90
• /
• 2018

Various navigation systems are integrated with the Global Navigation Satellite System (GNSS) to improve navigation performance so that continuous navigation information can be obtained even when navigation performance is degraded or navigation is not available due to the outage of GNSS. Time and cost can be reduced by evaluating performance of the integrated navigation system through Modeling and Simulation (M&S) software prior to the deployment of the integrated navigation system. The measurements of the navigation system should be generated to evaluate performance through of the navigation system M&S software. This paper proposes a method of designing a navigation environment generation module in M&S software of the integrated navigation system. To show applicability of the proposed method to M&S software design of the integrated navigation system, functions are verified through MATLAB. And then visual C++ based M&S software for the integrated navigation system is implemented to check the operation of the navigation environment generation module. The reference trajectory is generated and true measurements of Global Positioning System (GPS), Korea Positioning System (KPS), and enhanced Long range navigation (eLoran) are generated from the reference trajectory. The navigation results obtained from the true measurements are compared with the reference trajectories. The results show that the measurements generated using the design generation module by the proposed method are valid and the navigation environment generation module can be applied to M&S software of the integrated navigation system.