• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.17 no.8 s.111
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• pp.773-787
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• 2006

An airborne radar is an essential aviation electronic system for the aircraft to perform various civil and/or military missions in all weather environments. This paper presents the design, development, and test results of the multi-mode X-band pulsed Doppler radar system test model for helicopter-borne flight test. This radar system consists of 4 LRUs(Line-Replacement Unit), which include antenna unit, transmitter and receiver unit, radar signal & data processing unit and display Unit. The developed core technologies include the planar array antenna, TWTA transmitter, coherent I/Q detector, digital pulse compression, MTI, DSP based Doppler FFT filter, adaptive CFAR, moving clutter compensation, platform motion stabilizer, and tracking capability. The design performance of the developed radar system is verified through various ground fixed and moving vehicle test as well as helicopter-borne field tests including MTD(Moving Target Detector) capability for the Doppler compensation due to the moving platform motion.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.32 no.2
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• pp.110-118
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• 2004

• 전기의세계
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• v.44 no.11
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• pp.44-49
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• 1995

간략하지만 최신 기술이 적용된 무정전전원장치에 대해 소개하였다. 전원 장치는 새로운 특성을 요구하는 부하가 지속적으로 출현함에 따라 지속적인 발전이 이루어져야 할 것이며, 고성능화, 고기능화, 저가격화, 소형화, 무소음화 등을 실현하기 위한 전력 전자 기술이 발전할 것이다. 그리고, 사용자의 편의를 위해 원격 감시, 원격 제어 기능은 물론 운전 DATA 기록 및 관리 기능이 탑재되어 신뢰성을 극대화할 수 있고, 운용상 애로가 없도록 주변장치의 개발 및 보완 기술이 적용되어야 할 것이다.

• Journal of Drive and Control
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• v.17 no.4
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• pp.170-175
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• 2020

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.21 no.4
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• pp.331-339
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• 2010

To analyze and verify the performance of a MWR(Missile Warning Radar) of a GVWS(Ground Vehicle Weapon System), there is a need to make a simulator which can conduct the linked and engaged test virtually using the simulated signals. In this paper, a method of the simulator design for MWR is proposed to solve the above need. The SP(Signal Processor) part which generates the simulated signals and analyzes the algorithms is explained. The RF(Radio Frequency) part which transforms IF(Intermediate Frequency) signals into RF signals, radiates RF signals, and controls the linked equipments is also explained. The utility of the proposed design is proved by presenting the results of the contributions to the development of MWR.

• Aerospace Engineering and Technology
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• v.10 no.1
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• pp.98-106
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• 2011

This paper is summarized for designing launch vehicle autopilot structure with attitude angle command from guidance algorithm and for evaluating performance of autopilot using launch vehicle six-degree of freedom simulation program. The suggested autopilot has heritage from KSR-III/KSLV-I upper stage autopilot designing experience, and it has two design point. The one is, it must have same performance with KSR-III/KSLV-I upper stage autopilot, the other is, it must be simple autopilot structure and use low number of variable to apply on-board system. It is evaluated the performance using launch vehicle six-degree of freedom simulation program in case of roll maneuvering and no roll control flight condition.

• Aerospace Engineering and Technology
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• v.9 no.1
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• pp.50-59
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• 2010

In this paper, the alignment and navigation results by INGU(Inertial Navigation and Guidance Unit) onboard software and by Inertial Explorer which is a post-processing software specialized for IMU(Inertial Measurement Unit) are compared for identification of inertial sensor error models and estimation of alignment and navigation errors for KSLV-I INGU. For verification of the IMU error estimated by Kalman Filter of Inertial Explorer, the covariance parameters of inertial sensor error model state are identified by using stochastic error model of inertial sensors estimated by Allan variance and the alignment and navigation test with static condition and the land navigation test with dynamic condition are carried out. The validity of inertial sensor model for KSLV-I INGU is verified by comparison the alignment and navigation results of INGU on-board software and Inertial Explorer.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.32 no.6
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• pp.142-147
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• 2004

Satellite laser ranging (SLR), which is the most accurate geodetic method for precise orbit determination of artificial satellites, will be used to determine the precise orbit of STSAT2. This paper will present the development of a Laser Reflector Array (LRA) of STSAT2. Currently one LRA was designed, analyzed, manufactured, optically tested and assembled.

• Proceedings of the IEEK Conference
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• 2002.06b
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• pp.181-184
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• 2002

본 논문에서는 600Hz 무선 LAN 시스템에 탑재를 위한 600㎓ 대역 전력증폭기 모듈을 개발 하였다. 600㎓ 대역 전력증폭기 모듈에 실장된 600㎓ 대역 전력증폭기 MMIC는 ETRI에서 설계 및 제작한 것으로 칩의 크기는 2.80 × 1.75㎟이며, on-wafer측정을 하여 얻은 결과는 동작 주파수 58~620Hz에서 소신호 이득은 12.4dB이고, 최대 소신호 이득은 59~60G보z에서 ISdB이며, 출력전력(Pldn)은 16.3~16.7dBm을 얻었다. 이와 같은 특성을 갖는 전력증폭기 MMIC를 사용하여 모듈을 제작하였으며, RF feed line을 위해 Rogers 사의 R03003 기판을 사용하였다. 모듈의 입출력은 동작 주파수 대역에 적합한 WRl5라는 waveguide 형태를 사용하였고, DC 바이어스 공급을 위해 3.5㎜ K-connector를 사용하였다 제작한 모듈의 크기는 40 × 30 × 15㎣이며, 최적의 성능을 얻고자 tuning bar를 상하로 이동하여 최적점을 찾았으며 나사로 고정하여 상태를 유지하도록 하였다. DC 바이어스 및 RF feed line과 칩의 연결은 본딩에 의한 인덕턴스를 최소화하기 위하여 3mil 두께의 리본 본딩을 하였다 전력증폭기 모듈을 측정한 결과, 동작주파수 600㎓ 대에서 소신호 이득은 6dB 이상, 입력 정합은 -lOdB 이하, 출력 정합은 -4dB 이하로 측정되었긴, 출력전력은 SdBm 이상으로 측정되었다. 동국대에서 제작한 600Hz 무선 LAN 시스템에 전력증폭기 모듈을 시스템 송신부에 탑재 시험한 결과, 동영상을 실시간으로 전송하는데 성공하였다.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.20 no.6
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• pp.580-588
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• 2009

A Missile Warning Radar is an essential sensor for active protection system to detect antitank missile in all weather environments. This paper presents the design, development, and test results of L-band pulsed Doppler radar system for main battle tank. This radar system consists of 3 LRUs, which include antenna unit, transmitter and receiver unit and radar signal & data processing unit. The developed core technologies include the patch antenna, SSPA transmitter, coherent I/Q detector, DSP based Doppler FFT filter, adaptive CFAR, SIW tracking capability, and threat decision. The design performance of the developed radar system is verified through various ground fixed and moving vehicle test.