• Journal of Satellite, Information and Communications
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• v.9 no.4
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• pp.82-86
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• 2014

In this paper, we propose a novel modulation scheme specialized in real time broadcast system using a multicopter. Since multicopters have many advantages in aerial photography, they have been widely used in broadcasting technologies. However, because of restrictions on flight time, it is difficult to utilize multicopters in real time broadcasting systems. Therefore, video transmission using multicopter is necessary for low power communication techniques in air channel environment. Performance results of the hybrid modulation in this paper are compared to that of conventional modulations with Bit Error Rate (BER) and Signal to Noise Ratio (SNR) simulations. The results also showed that proposed system is suitable for aerial photography. Experiments demonstrated the superiority of the proposed modulation scheme by showing received symbols through an USRP equipment.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.10 no.1
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• pp.22-31
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• 1999

The conventional RZ-SSB demodulator consists of a limiter, FM demodulator and a linearizer. Since the conventional linearizer which cancels the high-order distortions must include Hilbert transformer, the performance of the demodulator are determined by the Hilbert transformer which is very complicated to realize in aeronautical telecommunication. This paper describes a method of designing RZ-SSB demodulator without Hilbert transformer. Since avionics systems are able to eliminate the inherent disadvantages in RZ-SSB, the results of this paper suggest that the RZ-SSB demodulator without Hilbert transformer is suitable for aeronautical telecommunication transceiver systems used in HF band.

• Satellite Communications and Space Industry
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• v.4 no.2
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• pp.84-88
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• 1996

인류가 달에 착륙한 이후 우주개발은 인류에 있어서의 위대한 전진이며 역사적 의의를 지니고 있다. 세계 각국에 우주가 인류의 마지막 보고라는 인식이 커지면서, 최근 우주개발을 둘러싼 세계의 경쟁은 대단히 치열하다. 각종 첨단기술의 결집과 복합응용이 필수인 우주산업을 국내기술로 이루기 위한 노력이 선진국에 비해 결코 적지 않으며 그 뜨거운 열정 또한 우주산업의 미래를 밝게 해 주리라고 믿는다. 항공우주연구소는 우리 나라의 항공.우주과학기술의 개발과 실용화를 위한 중심체 역할을 담당하고 있는 국책연구기관으로서 1989년 10월에 설립되었다. 설립이래, 수많은 업적을 이룩한 바 있으며, 특히 무궁화위성 버스 기술지원사업과 우리별 2호의 우주환경시험 등으로 국내에서는 거의 불모지나 다름없던 위성관련 분야에서 꾸준한 기술축적을 이루어 현재는 위공위성 본체설계 능력을 갖추었으며, 소형위성의 우주환경시험 시설 및 관련기술을 보유하고 있다. 또한 '94년 11월부터 시작되어 현재 추진중인 다목적 실용위성사업은 우리나라 우주기술개발의 새로운 비젼을 제시하는 대형국책사업으로 산.학.연.관의 협력으로 추진되고 있다. 이러한 중요한 시점에 항공우주연구소를 이끌어 나갈 제 4대 소장으로 취임한 장근호 소장으로부터 항공우주산업의 발전을 위한 항우연의 마스터 플랜과 추진현황, 전망 등에 대하여 들어보았다. 열정적으로 대담하시는 모습에서 우주를 향한 우리의 푸른 꿈이 큰 결실을 맺을 것이라는 확신을 가졌다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.22 no.9
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• pp.1220-1227
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• 2018

Avionics electronic equipment refers to the electronic equipment installed on an aircraft. Failure of avionics equipment can have a significant impact on aircraft operations as well as threaten the safety of pilots and passengers. Therefore, avionics electronic equipment is required to have higher reliability and safety than electronic equipment used for other purposes. Avionics equipment must consider various component selection and system design to meet reliability and safety-related requirements from the initial design stage. In this paper, we describe safety, reliability performance analysis method of avionics equipment, and introduce various design improvement methods that can be performed to meet safety requirement performance. Finally, the safety performance of the improved avionics equipment was reanalyzed and compared with the value before the improvement, the validity of the proposed design change was verified.

• Journal of Advanced Navigation Technology
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• v.16 no.4
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• pp.611-618
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• 2012

ICAO has recommended the introduction of New CNS/ATM based on GNSS technologies and Data link communication to purpose increasing air traffic demand. The CNS/ATM is composed of communication, Navigation, Surveillance and Air Traffic Management. Cockpit Display Traffic Information(CDTI) that is equipment to share air traffic information to Pilot, Traffic Controller and ground vehicles has been built based on Automatic Dependent Surveillance-Broadcast(ADS-B) information in Surveillance field. This paper is research that what is the effect between pilot and controller through CDTI. Based on ATC communication between Pilot and Controller, We construct simulation environment and did a comparative analysis of it. according to result, We can verify that CDTI makes aircraft Call sign, Position, Altitude information read rate, and notice of air traffic information between Pilot and Controller more improve than ATC environment and Existing Radar System.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.21 no.10
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• pp.1873-1878
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• 2017

Recently, many researches have been conducted on the aviation industry to replace the wire harness cable between the avionics of the aircraft with the wireless network. In this paper, we present an Event-Based Simulator for Wireless Avionics Intra-Communications (ES-WAIC) that can verify core technologies of wireless networks and efficiently integrate different layers of the network. ES-WAIC is developed to enhance the readability between the real time control application developers of the higher layer and the network layer developers. Specifically, the practical implement relies on an event-based programming concept to increase portability and compatibility that can be applied to the realistic low-power wireless embedded networks. ES-WAIC implements the overall system layers including the wireless channel modeling of the 4.4GHz band, the physical layer, the medium access control, the network, and the application layer of wireless avionics intra-communications.

• Journal of Aerospace System Engineering
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• v.16 no.6
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• pp.81-89
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• 2022

This study measured the radio environment of 10 domestic institutions with CubeSat ground stations for 24 hours in three frequency bands (VHF/UHF/S-band) allocated by the International Telecommunication Union (ITU). The impact of the RF environment around the ground stations on CubeSat downlink frequencies was analysed and compared with acceptable interference noise requirements from the CubeSat RF link. The findings indicate that not only the selection of downlink frequency but also the configuration of RF communication link design and ground station system of CubeSat should consider the S-band RF environment around the ground station due to the presence of several wireless devices.

• Journal of the Korean Society for Aviation and Aeronautics
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• v.28 no.4
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• pp.102-116
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• 2020

The existence of appropriate teaching materials in foreign language is very essential especially if it is related to safety. Among them, the importance of textbooks is more emphasized because there is no suitable education or curriculum for EPTA (English proficiency test of aviation). A good textbook not only presents the right direction to study but also provides an efficient way to learn. This research exploded how well textbooks for EPTA are organized and analyzed current pilots' responses whether the textbooks are suitable for preparing EPTA through the questionnaire. The conclusion drawn is that textbooks for EPTA should be designed to encourage current and pre-pilots to learn how to communicate with controllers efficiently and briefly, and also should provide proper guide lines for preparing EPTA.

• Satellite Communications and Space Industry
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• v.3 no.2
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• pp.47-57
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• 1995

• Satellite Communications and Space Industry
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• v.3 no.2
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• pp.106-108
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• 1995