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김의호 사단법인 항법시스템학회 2016 Journal of Positioning, Navigation, and Timing Vol.5 No.4
This paper presents a method to suppress multipath induced by pulses using supervised learning. In modern electronics, pulses have been used for various purposes such as communication or distance measurements. Like other signals, pulses also suffer from multipath. When a pulse and a multipath are overlapped, the original pulse shape is distorted. The distorted pulse could result in communication failures or distance measurement errors. However, a large number of samples available from a pulse can be used to effectively reject multipath by using a supervised learning method. This paper introduces how a supervised learning method can be applied to Distance Measuring Equipment. Simulation results show that multipath induced distance measuring error can be suppressed by 10 ~ 45 percent depending on the allowed pulse shape variation allowed in a standard.
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Kim, Euiho The Institute of Positioning 2016 Journal of Positioning, Navigation, and Timing Vol.5 No.4
This paper presents a method to suppress multipath induced by pulses using supervised learning. In modern electronics, pulses have been used for various purposes such as communication or distance measurements. Like other signals, pulses also suffer from multipath. When a pulse and a multipath are overlapped, the original pulse shape is distorted. The distorted pulse could result in communication failures or distance measurement errors. However, a large number of samples available from a pulse can be used to effectively reject multipath by using a supervised learning method. This paper introduces how a supervised learning method can be applied to Distance Measuring Equipment. Simulation results show that multipath induced distance measuring error can be suppressed by 10 ~ 45 percent depending on the allowed pulse shape variation allowed in a standard.
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항행 및 항법 : 시각 비동기 오차를 고려한 다중 DME 측위 적용 방안 연구
최광호 ( Kwang-ho Choi ),임준후 ( Joon-hoo Lim ),유원재 ( Won-jae Yoo ),소형민 ( Hyoung Min So ),이형근 ( Hyung-keun Lee ) 한국항행학회 2015 韓國航行學會論文誌 Vol.19 No.6
본 논문에서는 다수의 DME (distance measuring equipment) 지상국에 대한 거리 측정치들을 결합할 경우 문제가 될 수 있는 시각 비동기 오차를 소개하고 이를 대비한 위치 결정 방법을 제안하였다. 소개된 시각 비동기 오차는 한 개의 DME와 한 개의VOR (VHF omnidirectional range)을 활용하는 기존의 위치 결정 방법에서는 발생하지 않는 오차요인이다. 제안된 방법은 항공기의 속도벡터를 이용하여 동기화 되지 않은 다수의 임의 시점의 DME 거리 측정값들을 위치 결정 시점으로 투영하는 원리를 활용하였다. 한 개의 대표적 궤적을 활용한 시뮬레이션을 통하여 제안된 방법을 활용할 경우 이미 구축되어진 DME 인프라의 변경 없이 다수의 DME를 활용하여 항공기의 위치를 높은 정확도로 추정할 수 있음을 확인하였다. This paper introduces the time-misalignment error between multiple range measurements acquired by an onboard distance measuring equipment (DME) interrogator and proposes an efficient position determination method that can mitigate the negative effects of the time-misalignment error. The introduced time-misalignment error does not occur in conventional utilization of DME combined with VHF omnidirectional range (VOR). The proposed position determination method projects all the DME range measurements acquired irregularly during an interval to the same time instance where the aircraft position is determined. By the simulation utilizing a representative aircraft trajectory, it is shown that it is possible to estimate the horizontal position accurately without any changes of ground DME facilities.
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A Study on Deep Reinforcement Learning Framework for DME Pulse Design
이정연,김의호 사단법인 항법시스템학회 2021 Journal of Positioning, Navigation, and Timing Vol.10 No.2
The Distance Measuring Equipment (DME) is a ground-based aircraft navigation system and is considered as an infrastructure that ensures resilient aircraft navigation capability during the event of a Global Navigation Satellite System (GNSS) outage. The main problem of DME as a GNSS back up is a poor positioning accuracy that often reaches over 100 m. In this paper, a novel approach of applying deep reinforcement learning to a DME pulse design is introduced to improve the DME distance measuring accuracy. This method is designed to develop multipath-resistant DME pulses that comply with current DME specifications. In the research, a Markov Decision Process (MDP) for DME pulse design is set using pulse shape requirements and a timing error. Based on the designed MDP, we created an Environment called PulseEnv, which allows the agent representing a DME pulse shape to explore continuous space using the Soft Actor Critical (SAC) reinforcement learning algorithm.
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UAM 복합 항법을 위한 C 밴드 지상기반 전파 항법 시스템 연구
이경순 ( Kyung-soon Lee ),조용운 ( Yong-un Cho ),김민정 ( Min-jung Kim ),구경헌 ( Kyung Heon Koo ) 한국항행학회 2023 韓國航行學會論文誌 Vol.27 No.4
본 연구는 기존 UAM에서 주로 사용하는 GNSS 항법과 협동 운용할 수 있도록 지상기반 C밴드 주파수 (5.03~5.15GHz)를 이용한 전파항법 VOR/DME 구현에 관한 것이다. 이것은 항공우주를 감독하는 미연방항공국 규칙 Title 14 CFR- Aeronautics and Space 135.165에서 제시한 ‘2개 이상의 독립적인 항법소스를 비행체에 적용’ 규정사항을 충분히 만족할 수 있는 항법기술 중 하나이다. 본 연구에서는 무인항공기용 주파수 5.03~5.15 GHz를 사용하였으며, 무인항공기에서 도착 버티포트까지의 방위각과 거리정보를 획득에 필요한 VOR/DME 시스템 구현을 수행하였다. 이를 위하여, 전파 전파경로 손실분석에 의한 링크버짓 도출, 소형화된 도플러 VOR용 안테나 형상설계 및 기존 항공기용 보다 측위거리 해상도가 향상된 DME 설계 등을 수반하였다. 본 연구 결과물은 지상기지국과 UAM에 장착할 수 있는 단말기로 구성되며, 각각 시제품 제작 및 주요 성능검증을 수행하였다. This study focuses on the implementation of C-band radio navigation in the 5.03 ~ 5.15 GHz terrestrial band to cooperate with GNSS navigation mainly used in existing UAMs. This is one of the navigation technologies that can fully satisfy the requirements of Title 14 of CFR-135.165. According to the FAA, the use of two or more independent navigation sources for aircraft is proposed for aircraft. This study proceeded with the link budget derivation through radio wave propagation path loss analysis, and antenna shape design for miniaturized Doppler VOR, and DME design with enhanced positional distance resolution compared to conventional aircraft. The ground navigation system which is the result of this study, consists of a VOR/DME ground station and a terminal that can be mounted on UAM. Significant performance was confirmed through the production and testing of each prototype.
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論文(논문) : 태양폭풍이 항행안전시설에 미치는 영향분석
조진호 ( Jin Ho Jo ),박재우 ( Jae Woo Park ),정철오 ( Cheol Oh Jeong ),김재훈 ( Jae Hoon Kim ),김기현 ( Gye Hyeun Kim ),박형택 ( Hyeung Tak Park ) 한국항공운항학회 2012 한국항공운항학회지 Vol.20 No.2
The solar storm generated by solar activity can be impact on earth in various area. If solar storm impact on Navaids system, it will be a serious problem for aviation and human safety. The impact analysis of solar strom on Navaids system are performed in three area, ILS, GPS navigation and radio communication for aviation. Analysis result show that Instrument Landing System(LLZ, GP, MB) and Navaids system(VOR, DME, Radar) are not impacted by the solar storm, but GPS system is impacted by solar storm. Also analysis result show that VHF/UHF radio system are not impacted by solar storm, but HF radio system is impacted by solar storm.
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