• Journal of the Korea Institute of Military Science and Technology
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• v.5 no.3
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• pp.45-55
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• 2002

중거리 유도무기 체계가 탄도탄과 같이 기동이 심한 표적과 교전할 때에는 지상 레이더는 표적 및 유도탄 위치정보를 보다 빈번하게 전송하여야 하지만, 자신의 임무를 수행해야 하므로 유도탄 및 교전 표적에 대한 정보를 필요이상으로 자주 전송할 수 없다. 이러한 상황에서 탐색기가 자체적으로 표적의 거리, 속도, 방향을 측정함으로서 지상레이더에 추가 부담을 지우지 않고 우수한 추적 정밀도로 교전성능을 향상할 시킬 수 있는 고반복 펄스열을 사용하는 PRF 변조방식을 제안한다.

• Proceedings of the KIEE Conference
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• 2003.07a
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• pp.354-356
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• 2003

본 논문에서 제시한 전력감시 시스템은 원주권광역상수도에 적용된 개방형 SCADA 시스템으로 무인화 사업장에 널리 사용되는 설비로서 중앙제어실에서 CRT화면을 통하여 원거리에 위치한 현장설비를 감시할 수 있으며 필요시 제어 명령을 보내서 해당기기를 제어하도록 구성되어 있다. 전기설비를 감시하는 모든 계전기는 디지탈로 구성되어 있어 전압, 전류값을 추적하고 판독하도록 되어 있다. 특히 각 판넬 내부에 설치된 폐쇄배전반 절연열화 진단설비는 전력설비 열화 시 발생하는 부분방전 검출을 위해 30MHz대역의 협대역으로 선정되어 있으며, 1초 동안 펄스 크기와 펄스 수량을 측정하여 열화진행과정을 실시간으로 근무자에게 통보하고, 또한 화재감시센서를 이용하여 화재발생 시 배전반 상부에 설치된 개별형 자동소화기가 동작하여 사고 파급을 막도록 구성하였다.

• Journal of the Korea Institute of Military Science and Technology
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• v.11 no.3
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• pp.50-57
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• 2008

A telemetry ground station has a highly directional, parabolic tracking antenna to receive a weak telemetry signal from a target at a distance. The tracking antenna with narrow beam-width normally uses the auto-track method for the target tracking. This paper presents several issues in the auto-track method and introduces a new tracking method using Self-Slaving technique. Self-Slaving means that the tracking antenna is slaved to not data measured by RADAR but GPS/INS informations received by the telemetry system for pointing. The Self-Slaving method shows good performance in comparison with auto-track method.

• Electrical & Electronic Materials
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• v.6 no.3
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• pp.220-227
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• 1993

본 논문에서는 산화막의 두께가 23.angs.이며 질화막의 두께를 각각 530.angs., 1000.angs.으로한 캐패시터형 MNOS소자를 제작하고 기억특성을 비교, 분석하였다. 특성조사를 위해 자동 .DELTA. $V_{FB}$ 추적장치를 설계, 제작하여 사용하였다. 기억트랩밀도는 질화막 두께 530.angs.인 소자가 1000.angs.인 소자보다 0.18 x $10^{16}$ $m^{-2}$ 크며, 0.31 x $10^{8}$ V/m 낮은 산화막 전기장에서 전자가 주입되었으며 $10^{4}$sec경과후 포획전자의 유지율도 우수하였다. 또한 포획된 전자는 실리콘쪽으로의 역터넬링으로 인한 감쇠가 우세하게 나타났다. 펄스전압 인가에 따른 플랫밴드전압의 변화가 선형적으로 증가하는 영역에서는 산화막 전류가 지배적이었으며 포화하다 감소하는 영역에서는 질화막 전류의 영향이 컸다. 소거동작은 포획된 전자의 방출과 실리콘으로 부터의 정공주입이 동시에 일어남을 관측하였다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.20 no.3
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• pp.121-127
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• 2020

The small tracking radar targets the target in a real-time, fast-moving, fast-moving target against aircraft with a large RCS that is maneuvering at low speed and a small RCS aircraft maneuvering at high speed (fighters, drones, helicopters, etc.) It is a pulsed radar that detects and tracks. Performing a performance test on a tracking radar in a real environment is expensive, and it is difficult to quantitatively measure performance in a real environment. Describes the composition of the laboratory environment's comprehensive performance test facility and the main requirements and implementation of each configuration.Anechoic chambers to simulate the room environment, simulation target generator to simulate the signal of the room target, target It is composed of a horn antenna driving device to simulate the movement of a vehicle and a Flight Motion Simulatior (FMS) to simulate the flight environment of a tracking radar, and each design and implementation has been described.

• 제어로봇시스템학회:학술대회논문집
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• 2000.10a
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• pp.176-176
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• 2000

Generally, discrete-time processing is applied to the uniformly-sampled signals. But, radars emit pulse trains with irregular time instances. In this paper, we formulate the radar pulse train as a stochastic discrete-time dynamic linear model. The estimation task can be done via linear signal processing using Kalman Filter and some considerations. As a result, we can estimate the pulse repetition interval of a pulse train and predict the time instances of the next pulses to be received.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.25 no.3
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• pp.372-375
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• 2014

A monopulse based on maximum likelihood(ML) in jamming scenario can suppress jamming signal using an inverse matrix of a covariance matrix. In order to achieve adequate suppression of jamming signal, the sufficient number of snapshots is required. However, this is not possible in high PRF scenario, which hinders a real-time tracking. Moreover, even with the large number of snapshots, the estimation accuracy of the target direction is decreased in low JNR(Jammer to Noise Ratio) due to insufficient jammer suppression. In this paper, we propose a monopulse algorithm that doesn't degrade performance significantly with a small number of snapshots and in low JNR. We show its derivation that exploits noise-jammer subspace of a covariance matrix, along with its performance through simulation.

• Journal of the Korea Convergence Society
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• v.13 no.1
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• pp.43-50
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• 2022

In this paper, it is shown how the performance of the monopulse algorithm in additive noise is evaluated. In the previous study, the performance analysis of the amplitude-comparison monopulse algorithm was conducted via the first-order and second-order Taylor expansion of four variables. By defining two new random variables from the four variables, it is shown that computational complexity associated with two random variables is much smaller than that associated with four random variables. Performance in terms of mean square error is analyzed from Monte-Carlo simulation. The scheme proposed in this paper is more efficient than that suggested in the previous study in terms of computational complexity. The expressions derived in this study can be utilized in getting analytic expressions of the mean square errors.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.48 no.5
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• pp.391-399
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• 2020

KASI (Korea Astronomy and Space Science Institute) has been developing the multipurpose laser tracking system with three functions of satellite laser tracking, adaptive optics and space debris laser tracking for scientific research and national space missions. The space debris laser tracking system provides the distance to space debris without a laser retro-reflector array by using a high power pulse laser, which employs a spinning disk to change the optical path between the transmit and receive beams. The spinning disk causes the collision band which is unable to reflect the returned signal to a detector and then has an effect on the tracking coverage of space debris. This study proposed the mathematical model for tracking coverage by taking into account the various specifications of spinning disk such as disk size, spinning velocity and collision rate between the disk and hole. In addition, the spinning disk specifications were analyzed in terms of tracking coverage and collision band based on the mathematical model to investigate tracking requirements of the Geochang laser tracking system.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.38A no.5
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• pp.409-415
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• 2013

In this paper, we propose a correlation function using newly designed local signals for cosine-phased binary offset carrier (BOC) signal tracking. First, we divide a sub-carrier pulse over one pseudo random noise code period into multiple rectangular pulses, and subsequently, design novel local signals. Then, we obtain a correlation function with no side-peak based on a combination of correlations between the newly generated local signals and received cosine-phased BOC signal. From numerical results, it is confirmed that the proposed correlation function provides a tracking performance improvement over the conventional correlation functions in terms of the tracking error standard deviation.