• Proceedings of the Korean Society of Computer Information Conference
• /
• 2015.01a
• /
• pp.35-36
• /
• 2015

무인항공기는 광대역의 전장 정보를 실시간으로 획득하거나 적 위협정보를 파악하기 위해 영상정보를 활용하며 보다 정확한 감시 및 정찰 정보의 획득과 가시화를 위해 정밀한 영상정보처리 기법이 요구된다. 이를 위해 본 논문에서는 무인항공기를 통해 획득한 영상 정보를 지상통제장비로 전송하고 이를 효과적으로 시각화하는 통합 시스템을 제안한다. 제안하는 영상정보처리 시각화 시스템을 통해 무인항공기와 지상통제장비는 전장에서 요구되는 임무와 역할을 효과적으로 수행할 것으로 기대한다.

• Aerospace Engineering and Technology
• /
• v.11 no.2
• /
• pp.158-163
• /
• 2012

Spherical Flying Machine, unlike conventional aircraft structure, is protected by circular frame. This battery-operated propeller machine, which can do vertical take-off and hovering, is under development for indoor and outdoor operation and dubbed as Flying Ball in KARI. In the future, autonomous air vehicle will be constructed for reconnaissance and surveillance application.

• Journal of the Korean Society for Aviation and Aeronautics
• /
• v.21 no.2
• /
• pp.33-39
• /
• 2013

Multilateration(MLAT) may complement secondary surveillance radar and also act as a real-time backup for the ADS-B system. This System is using time difference of arrival (TDOA) and based on triangulation principle. Each TDOA measurement defines a hyperbola describing possible aircraft locations. The accuracy in MLAT system depends on the positional relationship of the receiver and aircraft. There are various algorithms to localize aircraft based on TOA estimation. In this paper, we use least square method and extended Kalman filter and compare their results. Study results show that the extend Kalman filter provides a better performance than the least square method.

• Aerospace Engineering and Technology
• /
• v.12 no.1
• /
• pp.182-188
• /
• 2013

This paper described flight safety center, flight safety information system(FSIS) and flight safety officer's mission and training in sequence and presented analysis's results and data processed in real-time during KSLV-I 3rd flight test. During flight safety center's operation for the 3rd flight test, monitoring of KSLV-I flight status was normally performed and the algorithms for flight safety calculations including the one for instantaneous impact point computations are also executed normally.

• Aerospace Engineering and Technology
• /
• v.12 no.1
• /
• pp.152-162
• /
• 2013

The spectral irradiance of the Moon is used to monitor the performance of on-board satellite's visible channel detectors. This paper established a method to compute the spectral irradiance of the Moon using the relative positions between the Sun, Moon, and the COMS (Communication, Ocean, Meteorological Satellite), which is generated through the COMS FDS (Flight Dynamics Subsystem). The established computation method is applied to the algorithm which is developed to detect and compensate the degradations of COMS MI (Meteorological Imager) visible channel detectors.

• Journal of Biosystems Engineering
• /
• v.25 no.3
• /
• pp.233-240
• /
• 2000

A commercially available Doppler radar was modified and evaluated for on-board monitoring of ground speed. The radar output was corrected for pitch angle of aircraft based on the output of an electrolytic tilt sensor. The effects of aircraft speed, height and mounting angle on error in the ground speed were evaluated. The speed error decreased with an increase of the mounting angle since the radar contact angle with respect to the ground approached to the mounting angle. The error increased with an increase of the nominal aircraft speed. The altitude insignificantly affected the speed error. The Doppler radar provided acceptable percent errors within 5% in most measurements. The error can be reduced within ${\pm}$1.5% by increasing the mounting angle ($43^{\circ}$). The error of -3.8% at the mounting angle of $29^{\circ}$could be reduced by adjusting the mounting angle with respect to the radar contact angle.

• Journal of the Korean Society for Aviation and Aeronautics
• /
• v.20 no.3
• /
• pp.28-34
• /
• 2012

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.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2014.11a
• /
• pp.658-661
• /
• 2014

RTCA DO-278A는 통신, 항법, 감시 및 항공 교통 관리(CNS/ATM) 시스템과 장비에 대한 비항공용(지상 및 우주) 소프트웨어의 무결성을 보장하기 위한 개발 지침을 제공한다. 안전하고 효율적인 공항운영을 위한 차세대 지상이동 관제시스템인 A-SMGCS는 DO-278A의 무결성 보장 고려사항을 준수하여 개발되어야 한다. 본 논문에서는 소프트웨어 개발 수명 주기 전체에 걸쳐 DO-278A의 소프트웨어 무결성 보장 고려사항을 반영한 A-SMGCS 개발 방법을 제안한다.

• ICROS
• /
• v.22 no.3
• /
• pp.34-42
• /
• 2016

군사용 목적으로 개발된 드론이 급격한 발전을 통해 항공촬영, 배송, 정찰/감시 등의 민간 분야로 확대되면서, 최근에는 드론을 활용한 다양한 응용분야가 주목받고 있다. 농업분야의 드론 활용은 방제작업뿐만 아니라 파종, 작황 모니터링, 샘플채취 및 운반 등 스마트/정밀 농업 실현에 있어 큰 비중을 차지하고 있으며 그 활용이 기대되고 있다. 본 기술 특집호에서는 드론의 농업분야 국내 외 기술개발 동향에 대해 소개하고, 스마트/정밀 농업을 위한 드론의 기술이슈와 해결과제를 언급한다.

• Journal of the Korean Society for Aeronautical & Space Sciences
• /
• v.46 no.3
• /
• pp.244-250
• /
• 2018

Multilateration acquires the transponder signal of target from receivers installed on the ground and calculates the position of the target using the difference of the signal acquisition time of each receiver. One of the factors that influence the positioning accuracy of Multilateration using the TDOA calculation method is the error due to the precision measurement of signal input time. When measuring the signal input time at the receiver, the input signal is sampled using the reference clock of the receiver and a reference sample having the same sampling rate is applied to the cross correlation technique. Therefore, the accuracy of the signal input time is proportional to the reference clock. In this paper, the algorithm for precisely measuring the signal input time by performing cross correlation between the input signal of the receiver and DRS(Delayed Reference Sample) is proposed. In order to verify this, we implemented the pulse signal of the transponder that is transmitted from the target using Matlab. Through the simulation, cross correlation between the proposed DRS and the input signal was performed. From this result, the performance of the precise measurement of signal input time was analyzed.