• Title/Summary/Keyword: Avionics System

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Performace Analysis of Channel Presumption Technique with STTC Applied to IEEE 802.11a System (IEEE 802.11a 시스템에 STTC를 적용한 채널 추정 기법의 성능분석)

  • Kweon, Soon-Nyu;Lee, Yun-Hyun
    • Journal of Advanced Navigation Technology
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    • v.6 no.3
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    • pp.241-250
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    • 2002
  • This paper presents a way to maximize transmission efficiency and reception ability through transmission diversity technology, which can be adapted to wireless multimedia OFDM system. The presented method is a comparative analysis between a case where parameter ${\alpha}$ for time average is 0.3, 1 with consideration of channel presumption with two types of rms delayed spread, which is 50nsec, 150nsec, for the performance analysis of STTC(Space-Time Trellis Code) using time-space ciphering method appropriate for MIMO channel, and performance in the case where presumed channel value from long training column section is applied to according frame in a single frame. The result showed that BER brought SNR improvement of 1.0 dB in $10^{-3}$ when ${\alpha}$ was 0.3 than using only the long training column, and showed increase of general performance improvement for the sake of time average rather than the case without.

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Analysis of interference requirements in SBAS receiver for Flight Test (비행시험을 위한 SBAS수신기 간섭 요구사항 분석)

  • Shin, Hyun-Sung;Hong, Gyo-Young;Han, Ji Ae;Hong, Woon Ki
    • Journal of Advanced Navigation Technology
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    • v.21 no.6
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    • pp.585-592
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    • 2017
  • Recently, as the air traffic volume has been explosively increased, various studies are being conducted to increase the air passenger capacity. In order to compensate the limitation of the separation distance on the aerodrome established on the basis of existing VOR / DME equipment, GNSS utilizing satellite is considered. In addition, we are trying to obtain more precise location information by using SBAS, a system that can correct GNSS error. ICAO recommends introducing SBAS until 2025, and Korea has also started to develop KASS, a Korean SBAS since 2014. Therefore, in this paper, we analyze the interference threshold for the measurement items and the receiving antenna gain according to the elevation angle of the satellite receiving antenna.

Surge and Rotating Speed Control for Unmanned Aircraft Turbo-jet Engine (무인 항공기 터보 제트 엔진의 서지와 회전 속도 제어)

  • Jie, Min-Seok;Hong, Gyo-Young;Lee, Kang-Woong
    • Journal of Advanced Navigation Technology
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    • v.10 no.4
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    • pp.319-326
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    • 2006
  • In this paper, a fuzzy inference control system is proposed for a turbojet engine with fuel flow control input only. The proposed control system provides a practical fuel flow control method to prevent surge or flame out during engine acceleration or deceleration. A fuzzy logic is designed to obtain the fast acceleration and deceleration of the engine under the condition that the operating point should stay between the surge line and flame out control line. With using both engine rotating speed error and surge margin as fuzzy input variables, the desired engine rotating speed can be achieved to rapidly follow the engine control line without engine stall. Computer simulation using the MATLAB is realized to prove the proposed control performance to the turbojet engine which is linear modelized using DYGABCD program package.

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Implementation of Vertigo Warning function for FA-50 aircraft

  • You, Eun-Kyung;Kim, Hyeock-Jin
    • Journal of the Korea Society of Computer and Information
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    • v.24 no.10
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    • pp.1-9
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    • 2019
  • Fighter pilots are taking 'Advanced Pilot Training' courses to perform their missions perfectly even under adverse conditions. However, there are accidents that fall due to problems with the human body's equilibrium in the acceleration of flight, falling into the 'Vertigo, Spatial disorientation' phenomenon. As such, accidents that fighters fall due to spatial disorientation frequently occur not only in Korea but also abroad. In this study, we implemented the 'Vertigo' warning function in the fighter. First, we analyzed the aircraft's mission computer and the currently implemented warning functions. And we studied the coordinate system to utilize the aircraft attitude information. Based on this, we wanted to provide a visual warning to the HUD when the fighter flies over a certain time in the inverted flight position. Implementing this feature is expected to improve pilot flight safety. In addition, based on the results of this study, we propose a method to implement warning functions through linkage with other subsystems.

A study on the effect of cable improvement renovating an old aircraft (노후 항공기 개조 시 케이블 개량에 따른 효과 연구)

  • Lee, Gwang-suk;Yoon, In-bok;Jang, In-dong
    • Journal of IKEEE
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    • v.26 no.2
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    • pp.257-264
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    • 2022
  • As it takes a lot of time and money to develop an aircraft, an environment for renovating and using existing operating aircraft has been created. As a result, many old aircraft were renovated, and due to the aging of the aircraft, more demanding cable requirements were required for renovation projects, and as the number of equipment inside the aircraft gradually increased, the difficulty of system integration increased. In order to solve the difficulties of system integration through systematization of verification procedures, this paper explains VSWR, I-loss, which are the main indicators of antenna cable modification, and explains DTF, one of the problem detection methods. It also explains the elements required for cable design, the environment to be measured, and procedures, and introduces the overall process and effect of antenna cable improvement through demonstration cases.

Implementation of Personalized Rehabilitation Exercise Mobile App based on Edge Computing

  • Park, Myeong-Chul;Hur, Hwa-La
    • Journal of the Korea Society of Computer and Information
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    • v.27 no.12
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    • pp.93-100
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    • 2022
  • In this paper, we propose a mobile app for personalized rehabilitation exercise coaching and management service using an edge computing-based personalized exercise information collection system. The existing management method that relies on user input information has difficulty in examining the actual possibility of rehabilitation. In this paper, we implement an application that collects movement information along with body joint information through image information analysis based on edge computing at a remote location, measures the time and accuracy of the movement, and provides rehabilitation progress through correct posture information. In addition, in connection with the measurement equipment of the rehabilitation center, the health status can be managed, and the accuracy of exercise information and trend analysis information is provided. The results of this study will enable management and coaching according to self-rehabilitation exercises in a contactless environment.

Implementation of A Thin Film Hydroponic Cultivation System Using HMI

  • Gyu-Seok Lee;Tae-Sung Kim;Myeong-Chul Park
    • Journal of the Korea Society of Computer and Information
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    • v.29 no.4
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    • pp.55-62
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    • 2024
  • In this paper, we propose a thin-film hydroponic plant cultivator using HMI display and IoT technology. Existing plant cultivators were difficult to manage due to soil-based cultivation, and it was difficult to optimize environmental conditions due to the open cultivation environment. In addition, there are problems with plant cultivation as immediate control is difficult and growth of plants is delayed. To solve this problem, a cultivation environment was established by connecting the MCU and sensors, and the environment information could be checked and quickly controlled by linking with the HMI display. Additionally, a case was applied to minimize changes in environmental information. Implementation of a thin-film hydroponic cultivation system made soil management easier, improved functionality through operation and control, and made it easy to understand environmental information through the display. The effectiveness of rapid growth was confirmed through crop cultivation experiments in existing growers and hydroponic growers. Future research directions will include optimizing growth information by transmitting and storing cultivation environment information and linking and comparing growth information using vision cameras. It is expected that this will enable efficient and stable plant cultivation.

Proposal of a Fail-Safe Requirement Analysis Procedure to Identify Critical Common Causes an Aircraft System (항공기 시스템의 치명적인 공통 요인을 식별하기 위한 고장-안전 요구분석 절차 제안)

  • Lim, San-Ha;Lee, Seon-ah;Jun, Yong-Kee
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.50 no.4
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    • pp.259-267
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    • 2022
  • The existing method of deriving the fail-safe design requirements for the domestic developed rotary-wing aircraft system may miss the factors that cause critical system function failures, when being applied to the latest integrated avionics system. It is because the existing method analyzes the severity effect of the failures caused by a single item. To solve the issue, we present a systematic analysis procedure for deriving fail-safe design requirements of system architecture by utilizing functional hazard assessment and development assurance level analysis of SAE ARP4754A, international standard for complex system development. To demonstrate that our proposed procedure can be a solution for the aforementioned issue, we set up experimental environments that include common factors that can cause critical function failures of a system, and we conducted a cross-validation with the existing method. As a result, we showed that the proposed procedure can identify the potential critical common factors that the existing method have missed, and that the proposed procedure can derive fail-safe design requirements to control the common factors.

Implementation of Air Pollutant Monitoring System using UAV with Automatic Navigation Flight

  • Shin, Sang-Hoon;Park, Myeong-Chul
    • Journal of the Korea Society of Computer and Information
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    • v.27 no.8
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    • pp.77-84
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    • 2022
  • In this paper, we propose a system for monitoring air pollutants such as fine dust using an unmanned aerial vehicle capable of autonomous navigation. The existing air quality management system used a method of collecting information through a fixed sensor box or through a measurement sensor of a drone using a control device. This has disadvantages in that additional procedures for data collection and transmission must be performed in a limited space and for monitoring. In this paper, to overcome this problem, a GPS module for location information and a PMS7003 module for fine dust measurement are embedded in an unmanned aerial vehicle capable of autonomous navigation through flight information designation, and the collected information is stored in the SD module, and after the flight is completed, press the transmit button. It configures a system of one-stop structure that is stored in a remote database through a smartphone app connected via Bluetooth. In addition, an HTML5-based web monitoring page for real-time monitoring is configured and provided to interested users. The results of this study can be utilized in an environmental monitoring system through an unmanned aerial vehicle, and in the future, various pollutants measuring sensors such as sulfur dioxide and carbon dioxide will be added to develop it into a total environmental control system.

A Study on 3.0m Low-Altitude Long-Endurance Solar Powered UAV System (3.0m급 저고도 장기체공 태양광 무인기 시스템 연구)

  • Jaebaek Jeong;Taerim Kim;Doyoung Kim;Seokmin Moon;Jae-Sung Bae;Sanghyuk Park
    • Journal of Aerospace System Engineering
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    • v.17 no.4
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    • pp.10-17
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    • 2023
  • This paper describes the research and development of a 3.0 m Solar-Powered UAV system for mission flight that is based on the 4.2 m Solar-powered UAV. Both the Solar-Powered UAVs were lightened in weight by applying a composite fuselage and solar charging system. Also, a deep stall landing application and airbag module were installed for usability in mission performance. The flight performance of the Solar-Powered UAV system was verified through flight test. In particular, the 3.0 m Solar-Powered UAV performed continuous flight along the coastline of Jeju Island for 147 km in 3 hours and 50 minutes, and its performance as a mission flight was also confirmed.