• Title/Summary/Keyword: 통합항법시스템

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Implementation of the Single Channel GPS/Galileo Simulator (SIMULINK를 이용한 단채널 GPS/GALILEO 시뮬레이터 구현)

  • Yeom, In-Cheol;Im, Sung-Hyuck;Jee, Gyu-In;Ko, Sun-Jun
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.36 no.6
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    • pp.608-615
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    • 2008
  • Recently, research on GNSS signal receiver, aiding system and integrated navigation system approaching to the new satellite navigation system is needed. It it necessary to develop the GNSS simulator not only to understand the new satellite navigation system but also to develop the core technology about the system. In this paper, the simulator of the GPS and Galileo satellite nagivation is developed in IF(intermediate frequency) signal level.

An Analysis on Recent GLONASS and Satellite Signals (최신 GLONASS 현황 및 위성 신호 분석)

  • Choi, Chang-Mook
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2015.10a
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    • pp.1113-1114
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    • 2015
  • 세계적인 위성항법시스템 중에서 러시아의 GLONASS 시스템은 구소련의 붕괴이후 재정문제로 시스템이 완전한 임무수행 불가능하였으나 최근 러시아 정부의 위성항법 현대화 정책 추진으로 완벽한 상용화 및 추가적인 개선이 이루어지고 있다. 따라서 GLONASS 현황을 분석하고 위성으로부터 실측 데이터를 수신하여 분석한 결과 GPS 위성과 대등한 수준으로 향후 위성항법 사용자 측면에서 GLONASS 이용과 더불어 통합수신기 이용도 고려해야할 것이다.

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Implementation of GPS/Galileo Integrated Navigation Algorithm and Analysis of Different Time-Coordinate Effect (GPS/Galileo 통합항법알고리즘 구현 및 시각 및 좌표계차이에 따른 영향분석)

  • Song, Jong-Hwa;Jee, Gyu-In;Jeong, Seong-Kyun;Lee, Sang-Uk;Kim, Jae-Hoon
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.36 no.2
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    • pp.171-178
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    • 2008
  • Galileo is the Europe's global navigation satellite system corresponding to the GPS. The GIOVE-A test experiment has been finished and the second test satellite GIOVE-B will be launched soon. The integration of GPS and Galileo lead an increase of visible satellite number. We can obtain an improved navigation performance in signal blocked area such as urban or forest. GPS and Galileo have each time-coordinate system and use the different error model to calculate the navigation solution. In this paper, we studied on GPS and Galileo channel error model and time-coordinate system. Using this result, we implement the integrated navigation algorithm. In simulation, we analyzed the navigation error caused by time and coordinate disagreement and verified performance of integrated navigation algorithm in terms of visible satellite number, DOP(Dilution of Pression) and position error.

A Study on the DOP Improvement using Hybrid Satellite Navigation System (위성항법 통합시스템을 이용한 DOP 향상에 관한 연구)

  • Choi, Chang-Mook;Ko, Kwang-Soob
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.15 no.9
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    • pp.2045-2049
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    • 2011
  • In this paper, the DOP improvement was studied for the solution to an intentional jamming and the increase of position accuracy by selecting preferred satellites with hybrid satellite navigation system(both GPS and GLONASS). As a result of data analysis, the increases in 0.3 ~ 0.8 GDOP, 0.2 ~ 0.6 PDOP, and 0.1 ~0.3 TDOP were acquired by using hybrid satellite navigation system instead of GPS-only.

INS/Multi-Vision Integrated Navigation System Based on Landmark (다수의 비전 센서와 INS를 활용한 랜드마크 기반의 통합 항법시스템)

  • Kim, Jong-Myeong;Leeghim, Henzeh
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.45 no.8
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    • pp.671-677
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    • 2017
  • A new INS/Vision integrated navigation system by using multi-vision sensors is addressed in this paper. When the total number of landmark measured by the vision sensor is smaller than the allowable number, there is possibility that the navigation filter can diverge. To prevent this problem, multi-vision concept is applied to expend the field of view so that reliable number of landmarks are always guaranteed. In this work, the orientation of camera installed are 0, 120, and -120degree with respect to the body frame to improve the observability. Finally, the proposed technique is verified by using numerical simulation.

ASF 보상 방법에 따른 eLoran/GPS 통합항법 알고리즘 성능 개선

  • Song, Se-Pil;Jo, Seong-Han;Choe, Heon-Ho;Kim, Yeong-Baek;Lee, Sang-Jeong;Park, Chan-Sik
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2011.11a
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    • pp.193-195
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    • 2011
  • GPS는 높은 정확도를 갖지만 신호 간섭에 취약하다. 따라서 Loran-C의 정확도를 개선한 eLoran이 GPS의 보조항법 시스템으로 고려되고 있다. 본 논문에서는 eLoran/GPS 통합 항법 알고리즘에서 eLoran의 오차 요소인 ASF를 보상하는 방법에 따른 위치추정 결과의 정확도를 분석한다.

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Annual Prediction of Multi-GNSS Navigation Performance in Urban Canyon (도심지역에서의 연도별 다중위성항법 통합성능 예측)

  • Seok, Hyo Jeong;Park, Byung Woon
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.34 no.1
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    • pp.71-78
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    • 2016
  • In the paper, we predict the number of multi-GNSS satellites and visible satellites with the navigation satellite launch plans and their nominal orbit parameters. Based on the methodology, the multi-GNSS navigation performance and DOP (Dilution of Precision) variation from 2015 to 2020 were forecasted by the Matlab simulation. To calculate the position using the multi-GNSS constellation, we determined the time-offset between the two different systems. Two different algorithms were considered for the sake of time-offset determination; that of each was applied to system level and user side. Also, the results from two algorithms were compared for evaluating each performance. For the reality, we applied the 3D map information to the simulation, which is expected to contribute for predicting the future navigation performance in urban canyon.

Development of Navigation Computer for Small Satellites Using Integrated GPS/INS (소형위성용 GPS/INS 통합 항법 컴퓨터 개발)

  • Choi, Young-Hoon;Lee, Byung-Hoon;Chnag, Young-Keun
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.36 no.4
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    • pp.393-398
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    • 2008
  • This paper suggests a GPS/INS navigation computer architecture that can be applied to small satellites. In order to implement a GPS/INS navigation system on a small satellite, the extreme environment in space such as radiation, micro-gravity, vacuum, etc. must be considered. In addition, a real-time processing ability is required for the GPS/INS navigation system since the formation flying of multiple small satellites is the ultimate goal. The developed navigation electronics utilizes a PowerPC-type MPC860T that has space environment heritage, and a pair of Atmega128s that has been implemented in KAUSAT-2 and has completed the space environment verification tests. The navigation algorithm is designed to work in VxWorks environment, ported in MPC860T.

Time Delay Error Analysis and Compensation Method of Integrated Navigation System for Aircraft Store (항공장착물의 전달정렬을 위한 통합항법장치 시간 지연 오차 분석 및 보상 기법)

  • Seo, Byung-Il
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.46 no.7
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    • pp.592-601
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    • 2018
  • The GPS/INS integrated navigation system, which is one of the electronic equipments mounted on military aircraft store, can not directly receive GPS signals by the aircraft wing before the drop, so GPS navigation data is received from the aircraft and used for filter integration, afterwards, the integrated navigation is performed using the GPS information directly received through the antenna. In this case, it is possible to operate the mount in old aircraft without any modification of the aircraft when GPS data is transmitted using wireless. However, the delay occurs while the aircraft navigation data is transmitted to the integrated navigation filter of the aircraft store via wireless, which affects the time synchronization of the GPS measurement and the INS information, affecting the integrated navigation performance. In this paper, an algorithm to analyze and compensate the effect of generation and transmission delay that can occur when implementing GPS/INS integrated navigation system of aircraft store that receives GPS data via wireless.