• Journal of the Korea Institute of Information and Communication Engineering
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• v.25 no.7
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• pp.955-961
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• 2021

In modern warfare, the importance of electronic warfare, which carries out a mission that using radio wave to find out enemy information or to protect ally information, has increased. Radar jamming technique is one of the most representative techniques of EA(Electronic Attack), it disturbs and deceives enemy radar system in order to secure ally location information. Velocity deception jamming technique, which is one of the radar jamming techniques, generally operate against pulse-doppler radar which use doppler effect in order to track target's velocity and location. Velocity Deception Jamming Technique can be implemented using DRFM(Digital Radio Frequency Memory) that performs Frequency Modulation. In this paper, I describe implementation method of VGPO/VGPI(Velocity Gate Pull-Off/Pull-In) velocity deception jamming technique using phase-sampled DRFM, and verify the operation of VGPO/VGPI velocity deception jamming technique with board test under signal injection condition.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.44 no.12
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• pp.1103-1111
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• 2016

Korea Astronomy and Space Science Institute (KASI) has been operating SLR (Satellite Laser Ranging) system with 2kHz repetition rate for satellite precise orbit and spin determination as well as space geodesy. But the SLR system was improved to be capable of laser ranging with high repetition rate, up to 10kHz by developing new operation software and novel range gate generator, called HSLR-10. The HSLR-10 will contribute to the accurate spin rate determination of geodetic satellites and geodetic research due to its largest repetition rate in the world. In this study, the development methodology and configuration of operation software are addressed, and its validation results are also presented.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.29 no.1
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• pp.68-76
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• 2018

Target prioritization is necessary for a multifunction radar(MFR) to track an important target and manage the resources of the radar platform efficiently. In this paper, we consider an artificial neural network(ANN) model that calculates the priority of the target. Furthermore, we propose a neural network learning algorithm based on the steepest descent method, which is more suitable for target prioritization by combining the conventional gradient descent method. Several simulation results show that the proposed scheme is much more superior to the traditional neural network model from analyzing the training data accuracy and the output priority relevance of the test scenarios.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.20 no.12
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• pp.2417-2424
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• 2016

Small size and light weight is very important for components used in radar mounted platform such as airborne radar. Recently, the active phased array radar is developed as an array of antennas for thousands of transmit/receive modules to be used as a multi-function radar that can detect and track targets. In this case, the size and weight of the transmit/receive modules are critical factor for developing the radar. In this paper, we developed a compact transmit/receive module using the 10W RF MEMS switch domestically localizing and reduced the circuit area to about 86.5% compared to using a circulator. The developed module satisfies not only electrical requirements but also MIL-STD's environmental specifications. So it can be used in a military device. It can be used at adaptive tunable receivers, reconfigurable smart active antennas and wide band beam electrical steering antennas.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.20 no.2
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• pp.141-147
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• 2020

We studied for GPU based signal processor for naval multi-function radar. We implemented processing software both DSP and GPU, and compared computation performances and power consumption. As a result, computation performance was enhanced from 1.2 to 4.1 times compared with a DSP result. From the results, GPU can alternating DSP based signal processor for common radar processor even though Naval Multi Function Radar.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.11 no.4
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• pp.565-574
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• 2000

A new ground penetrating radar imaging method for the estimation of buried artificial structures location and their approximate shapes in dispersive lossy ground is investigated. Fundamental idea is based on estimating delayed time and amplitude retrieval coefficients from scattered signals by buried scatterers. Using absolute value integration of each scanning site not only improve the accuracy of measured scattered signal, but also offers convenient ways to extract the image of buried structures. Multi-term Debye model was employed to describe a dispersive and lossy ground medium. We used the finite difference time domain method to discretize the wave equation in continuous form into the machine suitable form. This imaging method uses a new wave path tracing technique in time domain, which is helpful to identify the exact position of buried structures against the ground surface fluctuations.

• Journal of the Korea Institute of Military Science and Technology
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• v.27 no.4
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• pp.446-456
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• 2024

This paper addresses a novel approach to performance enhancement of the naval gun fire control system(FCS) by using the projectile tracking filter without any distortion of radar measurements. Under the assumption that the maneuvering between the projectile and the ship equipped with the radar is not quite large, this method is based on the concept of polar-coordinate target tracking, which separates the range estimation filter and the direction cosine estimation filter. Note that using polar-coordinates allows tracking to be performed in the same coordinate system from which the radar line-of-sight(LOS) measurements are obtained, unlike the conventional tracking process in Cartesian. Also, it is easy to implement in real-time and guarantees consistent estimates due to its linear filter structure. With the help of the above method, therefore, the proposed filter is able to improve the overall performance of FCS which requires stability of projectile estimates within a short engagement time. The effectiveness of the presented scheme is validated through computer simulations.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.29 no.8
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• pp.648-659
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• 2018

In this study, both the altitude error due to the refraction and the range error due to the delay in the ionosphere with respect to the frequency are extracted according to the radar elevation to analyze the effect of atmosphere on the space surveillance radar. To achieve this, the radio refractivity profile is modeled using the measured data from domestic weather stations. Then, the altitude-error due to the refraction is extracted using the ray tracing method, and the range error in the ionosphere is extracted according to the frequency. Further, considerations for radar design with respect to the radar error characteristics are discussed based on the abroad space surveillance radar and proposed domestic space surveillance radar. This analysis of the error characteristics is expected to be utilized for the determination of radar location, range of steering, and frequency in the space surveillance radar design.

• 한국IT서비스학회:학술대회논문집
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• 2007.11a
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• pp.623-627
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• 2007

웹 2.0이 등장하면서, 인터넷은 데이터에 대찬 효과적 표현을 위할 시맨틱웹 정보화 사용자 중심의 정보 표현에 대한 패러다임이 등장하면서, 유투브, 세컨드라이프 등의 서비스 모델이 등장하기 시작하였다. UCI는 인터넷에서 디지털 콘텐츠에 대한 식별 체계 기능을 하며, 다양한 콘텐츠 유통 모델을 지원하는 체계로 2003년부터 본격적인 서비스를 시작하였다. UCI는 URN을 기반으로 서비스 체계를 완성하여 2007년 현재 15개 RA와 15백만개 이상의 콘텐츠에 대한 서비스를 제공하는 커다란 데이터 운명을 지원하고 있다. 웹 2.0의 다양한 메쉬업 서비스를 지원하기 위하여 UCI는 2가지 측면의 기술적 보완이 이루어졌는데, 하나는 UCL의 등장이며, 또 다른 하나는 콘텐츠 추적에 대한 BM을 제공하는 것이다. UCL은 UCC와 같이 사용자 중심의 인터넷 서비스를 쉽게 제공하기 위한 UCI 콘텐츠 인덱싱 정보를 콘텐츠 저작 도구를 통하며 제공함으로써, 쉽고 생산적인 콘텐츠 생성을 지원하는 것이다. 콘텐츠 추적은 콘텐츠를 분야별 엔티티를 통한 서비스 체계를 지원하는 BM의 특성들 가진 것으로, 콘텐츠 레파지토리의 프레임에 UCI를 제공하여 콘텐츠에 대한 일관된 관리 및 추적을 제공하는 것이다. UCI는 지속적으로 새로운 패러다임에 맞는 BM을 제공할 수 있는 기술들 개발하고 있으며, 콘텐츠 유통 체계의 인프라 서비스를 제공하고 있다.

• Current Industrial and Technological Trends in Aerospace
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• v.4 no.2
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• pp.49-54
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• 2006

현재 전라남도 고흥 외나로도에서는 발사체를 발사하기 위한 우주센터를 건립 중에 있다. 우주센터 내에는 추적레이다, 발사대, 발사통제시스템, 기상 장비 등 발사를 위한 그리고 발사 후의 발사체 추적을 위한 장비가 건설 중이다. 본 글에서는 우주센터 기상장비 중에서 낙뢰현상을 감지할 수 있고 낙뢰의 이동방향을 추적할 수 있는 종합낙뢰감지시스템에 대하여 낙뢰의 관측방법과 국내외에서 낙뢰를 감지하여 실제 기상청이나 Launch Site에서 사용하고 있는 실례를 소개하고 우주센터에 설치 중인 종합낙뢰감지시스템의 성능과 앞으로의 활용가능성에 대하여 알아보기로 하겠다.