• Journal of the Korea Institute of Military Science and Technology
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• v.19 no.5
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• pp.645-653
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• 2016

The terrestrial wireless backbone network and satellite communications system have been independently developed depending on their own purposes and operational concepts, which results in different characteristics in terms of network architecture and routing protocol operation. In this paper, we propose a method for structurally integrating them in consideration of routing mechanism in an autonomous system. Our approach is that the routers of satellite network operate the OSPF in PTP mode on their interfaces connected to the routers of terrestrial wireless backbone network with grid connectivity, whereas the OSPF in satellite network whose topology is of hub-spoke type runs in NBMA mode. We perform some simulations to verify that the satellite communications system can be integrated and interwork with the terrestrial wireless backbone network by our proposed approach. From simulation results, it is also found that the increases of network convergence time and routing overhead are acceptable.

• Journal of the Korea Institute of Military Science and Technology
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• v.27 no.3
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• pp.416-427
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• 2024

The wake-homing underwater guided weapon that detects and tracks wake generated during voyage of a surface ship is impossible to avoid with the present acoustic deception torpedo defense system. Therefore, research on bubble-generating wake decoy is necessary to deceive wake-homing underwater guided weapon. Experiments in various environments are required to verify the effective operation method and performance of the wake decoy, but performance verification through underwater experiment is limited. In this paper, we develop a simulator for an torpedo defense system of surface ship, which is applied bubble-generating wake decoy, against acoustic, wake, and hybrid homing underwater guided weapon attack. The simulator includes surface ship model, acoustic decoy(static, mobile) model, bubble-generating wake decoy model, search and motion model of underwater guided weapon and so on. By integrating various models, MATLAB GUI simulator was developed. Through the simulation results for various environmental variables by this simulator, it is judged that effective operation method and performance verification of the bubble-generating wake decoy can be performed.

• Journal of the Korean Magnetics Society
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• v.24 no.4
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• pp.114-122
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• 2014

Since 1990, Agency for Defense Development (ADD) has been operating the nonmagnetic laboratory and the magnetic sensors laboratory to develop the key technology of the ship's magnetic silencing and to research the high performance magnetic sensors used in the weapon system and to perform the technical support for Republic of Korea Navy. Recently, the main test equipment in the laboratories has been upgraded to improve the measurement and analysis abilities against magnetic target and to evaluate the performance of the magnetic sensors. In this paper, the capability and the current state of magnetic test facilities of ADD are described.

• Journal of the Korea Institute of Military Science and Technology
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• v.7 no.2 s.17
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• pp.88-99
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• 2004

A development of a software on radar target signature analysis is presented in this paper The target signature includes Radar Cross Section(RCS) prediction, Range Profile(RP) processing and Inverse Synthetic Aperture Radar(ISAR) processing. Physical Optics(PO) is the basic calculation method for RCS prediction and Geometrical Optics(GO) is used for ray tracing in the field calculation of multiple reflection. For RP and ISAR, Fast Fourier Transform(FFT) and Matrix Pencil(MP) method were implemented for post-processing. Those results are integrated into two separate softwares named as Radar Target Signature Generator(RTSG) and Radar Target Signature Analyser(RTSA). Several test results show good performances in radar signature prediction and analysis.

• Bulletin of the Korean Chemical Society
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• v.12 no.5
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• pp.460-461
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• 1991

• Bulletin of the Korean Chemical Society
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• v.10 no.5
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• pp.468-470
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• 1989

• Journal of the Korea Institute of Military Science and Technology
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• v.17 no.3
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• pp.342-349
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• 2014

MRDS is a short range missile/rocket defense system which protects a main battle tank(MBT) from threats in a short range. It is composed of 2 radars, 2 infrared trackers(IRTs), 1 fire control computer(FCC), 2 launchers and countermeasures. To guarantee the performance of the MRDS, these components have to be mounted on the vehicle with the known positions and directions and it is required to compensate the alignment errors. In this paper, a system alignment method using angular error compensation is proposed to install its components within a tolerance on the MBT. The test results are presented to evaluate and verify the effectiveness of the proposed method.

• Proceedings of the Korean Information Science Society Conference
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• 2006.06c
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• pp.304-306
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• 2006

21세기 정보혁명을 바탕으로 전쟁의 양상은 정보전, 네트워크 및 컴퓨터 중심의 사이버전과 같은 새로운 전쟁 패러다임으로 변화하고 있다. 이러한 정보전에 대비하여 국방정보체계에 다양한 정보보호시스템을 설치하여 사용하고 있다. 그러나 국방정보체계 환경에 현재까지 배치된 정보보호시스템들은 침해 사고에 대한 탐지 및 보고 등의 수동적인 대응만을 지원한다. 그러므로 발생한 공격에 대한 대응을 마련하더라도 동일한 공격자가 동일한 목표 시스템에 대하여 또 다른 공격 기술을 이용하여 재침입이 가능하다. 이를 방어하기 위하여 공격에 대한 능동적인 대응이 필요하다. 대표적인 능동 대응 기술인 침입자 역추적은 시스템 및 네트워크에 대하여 공격을 시도하는 침입자의 네트워크 상의 실제 위치를 추적하는 기술이다. 침해 사고를 근본적으로 차단하기 위하여 침입자의 실제 신분 확인이 필수적이다. 이를 위하여 본 논문에서는 침입자 역추적 기술을 분석하고 국방정보체계 환경을 위한 세션분석기반의 침입자 역추적 기술을 제안한다. 또한 이 기술을 기반으로 구현한 침입자 역추적 시스템을 소개한다.

• Journal of the Korea Institute of Military Science and Technology
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• v.20 no.2
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• pp.181-186
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• 2017

Synthetic aperture radar(SAR) has been widely used for reconnaissance. It provides high-resolution, day-and-night and weather-independent images for a multitude of applications. Because SAR coherently combines many viewing angles to effectively create a large aperture(narrow beam) radar, the test-bed should be capable of moving straightly SAR sensor for the integration angle to meet resolution. This paper describes the test-bed developed to test and evaluate the SAR performance. It forms high-quality images in real time and saves the raw data for the purpose of post processing on the ground.

• Journal of the Korea Institute of Military Science and Technology
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• v.23 no.3
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• pp.302-309
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• 2020

Early-detection and monitoring of toxic chemical gas cloud with chemical detector is essential for reducing the number of casualties. Conventional method for chemical detection and reconnaissance has the limitation in approaching to chemically contaminated site and prompt understanding for the situation. Stand-off detector can detect and identify the chemical gas at a long distance but it cannot know exact distance and position. Chemical detection UAV is an emerging platform for its high mobility and operation safety. In this study, we have conducted chemical gas cloud detection with the stand-off chemical detector and the chemical detection UAV. DMMP vapor was generated in the area where the cloud can be detected through the field of view(FOV) of stand-off chemical detector. Monitoring the vapor cloud with standoff detector, the chemical detection UAV moved back and forth at the area DMMP vapor being generated to detect the chemical contamination. The hybrid detection system with standoff cloud detection and point detection by chemical sensors with UAV seems to be very efficient as a new concept of chemical detection.