Assessment of Positioning Accuracy using Pseudolite Positioning System with Pseudo–GNSS Signals in GNSS Obstructed Area
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본 연구는 GNSS (Global Navigation Satellite System) 폐색지역에서 위치결정이 가능하도록 적합한 GNSS 측위 방안을 도출하고, 이를 통해 다양한 LBS의 개발 및 활용을 지원하기 위해 수행되었다. 이를 위해 국내의 GNSS 폐색지역 해소에 적합한 것으로 분석된 다중신호 의사 GNSS 기법을 적용한 의사위성(Pseudolite) 측위시스템을 구성하고, 실험에 적합한 환경의 GNSS 폐색지역을 선정하여 그 성능과 활용성을 검증하고자 하였다. 실험 지역으로 다중경로의 영향이 적으며, 완전 폐색지역과 부분 폐색지역으로 구분이 명확한 대형 교량 하부에 의사위성 장비를 설치하고, 측량용 GNSS 수신기를 이용한 단독측위 방식의 위치결정 실험을 수행하였다. 그 결과 국내의 GNSS 폐색지역 위치결정에 적합한 의사 GNSS 측위 모델을 정립할 수 있었으며, 본 연구에서 제안한 의사 GNSS 기술을 활용하는 경우 GNSS 폐색지역 내에서도 개활지와 유사한 수준의 GNSS 단독측위 정확도(수 m 이내)로 수평 위치결정이 가능하였다.Keywords:
GNSS augmentation
Air navigation
ICAO (International Civil Aviation Organization)는 GNSS (global navigation satellite system)를 이용하는 PBN (performance based navigation) 도입을 권고하였다. 우리나라도 PBN 로드맵을 수립하여 항공분야에서 GNSS를 이용할 수 있는 환경을 갖추려 시도하고 있으며, 2014년 10월 한국형 SBAS (satellite-based augmentation system) 개발을 위해 KASS (Korea augmentation satellite system) 사업을 본격적으로 착수하였다. 항공기가 GNSS를 이용하기 위해서는 수신기와 같은 항법장비를 탑재해야 한다. GNSS 항법장비는 항로, 이륙 도착, 접근 등 비행 단계에서 사용되기 때문에 장비의 규격은 다양하고 각각 별도로 그 기능과 성능을 규정하고 있다. 이 논문에서는 현재까지 제정된 항공용 GNSS 장비 표준안과 규정된 항법장비 및 인터페이스 규격에 대해 분석하여 정리하였다. KASS 개발 구축 시 비행시험 및 비행절차 개발 등 항공용 GNSS 탑재장비 등이 요구되는 곳에 활용성이 있을 것으로 기대한다. International Civil Aviation Organization (ICAO) has recommended the adoption of performance-based navigation (PBN), which utilizes global navigation satellite system (GNSS). As a part of efforts to adopt PBN in South Korea, preparations have been made to implement GNSS. In Oct. 2014, Korea augmentation satellite system (KASS) was officially launched for development. A set of navigation devices need to be on-board for an airplane to utilize GNSS. GNSS navigation devices are used for different phases of flights through en-route, terminal, departure, approach and a wide variety of specification standards have been proposed for GNSS navigation. In this paper, we investigate the many proposed standards for GNSS navigation devices and their interfaces. This paper can be useful for designing procedures and flight test used in KASS implementation.
GNSS augmentation
Air navigation
Navigation System
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Global Navigation Satellite System (GNSS) and Inertial Navigation System (INS) are the most widely used navigation systems at present. Aiming at the limitations of a single system application, this paper uses kalman filter to fuse the pose information provided by GNSS and INS, respectively. GNSS has the characteristics of being easily affected by the environment but with high absolute positioning accuracy. INS has the characteristics of high sampling frequency and autonomous navigation, but the error accumulates with time. Combining the advantages of the two systems to achieve the purpose of obtaining higher-precision pose information. In addition, aiming at the problem that GNSS/INS integration cannot provide continuous, stable and reliable navigation solutions under the GNSS signal blocking environment, a smoothing post-processing algorithm for GNSS/INS integration is studied. Through experimental verification, this algorithm can effectively improve the pose accuracy under GNSS signal blocking environment.
GNSS augmentation
Blocking (statistics)
Air navigation
Smoothing
SIGNAL (programming language)
Navigation System
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ICAO (International Civil Aviation Organization)는 GNSS (global navigation satellite system)를 이용하는 PBN (performance based navigation) 도입을 권고하였다. 우리나라도 PBN 로드맵을 수립하여 항공분야에서 GNSS를 이용할 수 있는 환경을 갖추려 시도하고 있으며, 2014년 10월 한국형 SBAS (satellite-based augmentation system) 개발을 위해 KASS (Korea augmentation satellite system) 사업을 본격적으로 착수하였다. 항공기가 GNSS를 이용하기 위해서는 수신기와 같은 항법장비를 탑재해야 한다. GNSS 항법장비는 항로, 이륙·도착, 접근 등 비행 단계에서 사용되기 때문에 장비의 규격은 다양하고 각각 별도로 그 기능과 성능을 규정하고 있다. 이 논문에서는 현재까지 제정된 항공용 GNSS 장비 표준안과 규정된 항법장비 및 인터페이스 규격에 대해 분석하여 정리하였다. KASS 개발·구축 시 비행시험 및 비행절차 개발 등 항공용 GNSS 탑재장비 등이 요구되는 곳에 활용성이 있을 것으로 기대한다.
GNSS augmentation
Air navigation
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Global Navigation Satellite System (GNSS) is been developing in many countries. The satellite navigation system has the importance in economic and military fields. For utilizing satellite navigation system properly, the technology of GNSS Ground Station is needed. GNSS Ground Station monitors the signal of navigation satellite and analyzes navigation solution. This study deals with the navigation software for GNSS Ground Station. This paper will introduce the navigation solution algorithm for GNSS Ground Station. The navigation solution can be calculated by the code-carrier smoothing method, the Kalman-filter method, the least-square method, and the weight least square method. The performance of each navigation algorithm in this paper is presented..
GNSS augmentation
Air navigation
Navigation System
Dilution of precision
Ground station
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In this paper, a navigation system was designed, and performance tested in order to confirm the safety improvement of the GNSS(Global Navigation Satellite System)-based AGV(Autonomous Guided Vehicle) which used only position information on of GNSS. We developed DR(Dead Reckoning) navigation system that involve the use of GNSS abnormal positoning error detection and GNSS signal outage. The test results show that GNSS positioning error is detection can be archived with an error of more than 0.15m. In addition, the DR driving position error is 1.5m for an 8s GNSS positioning service outage.
GNSS augmentation
Air navigation
Dead reckoning
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The recent transition to Performance Based Navigation in aviation enhances the accuracy of aircraft position, safety and efficiency in air traffic operations by using satellite-based navigation system such as GNSS. However, intentional interferences with GNSS signal as well as ones coming from natural phenomena such as solar storm increase. GNSS have very low power and therefore their signals are more susceptible to interferences than ground-based navigation signals. This paper introduces requirements of alternative positioning, navigation and timing(APNT) system and relevant technologies when the GNSS signals are not valid.
Air navigation
Radio navigation
GNSS augmentation
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The Global Navigation Satellite System (GNSS) is a high precision navigation system based on satellite, which implements worldwide, all-weather, real-time, continuous navigation and position. It is very necessary to establish a rational and flexible simulation system of GNSS, which can help to analyse the characteristics of GNSS and research on technologies of the GNSS receiver, jamming and anti-jamming etc. A GNSS simulation model is presented, which adopts a time management strategy based on time step to complete simulation synchronization and implement the simulation of GNSS effectively.
GNSS augmentation
Granularity
Air navigation
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With the rapid development of the GNSS(Global Navigation Satellite System),the interoperability of multi-systems is widely focused in recent years.It's expressed that the development of GNSS,then took the comparison between the sole navigation satellite system(BDS)and multi-system as an example,making the simulation of the navigation and position performance in our homeland with the two indices:observed satellite number and DOP.The result of the simulation shows that the performance of the navigation and positioning is distinctly improved by multi-system interoperability.
Navigation System
Area navigation
Position (finance)
Air navigation
Precise Point Positioning
GNSS augmentation
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This paper gives an overview on communications system based and global navigation satellite system (GNSS) based navigation. Starting from the physical layer model of a mobile communications or navigation receiver, we highlight similarities and differences between the two receivers. We explain navigation principles for timing measurements and present the possible navigation accuracies of different communications systems and GNSSs. Finally, we examine synergies of combined receivers and systems.
GNSS augmentation
Air navigation
Radio navigation
Navigation System
Communications satellite
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Nowadays, both in the Russian Federation and in foreign countries, the use of global navigation satellite systems (GNSS) for solving various applied problems is an extremely popular solution. Taking into account the current level of development of satellite radio navigation systems, ordinary users have been able to determine their position with a sufficiently high accuracy. However, some tasks require the use of high-precision equipment of geodetic class. Such equipment allows obtaining navigation solutions with an accuracy of better than 10 cm. Unfortunately, the cost of navigation-class navigation equipment is extremely high. Specialists working in the field of satellite navigation are particularly interested in the possibility of using mass-produced GNSS modules to obtain high-precision navigation solutions. In this paper, the possibility of such an application will be considered, taking into account the results of laboratory tests of a mass-produced navigation module.
Air navigation
Navigation System
GNSS augmentation
Position (finance)
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