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예성혁,류충호,황규환,서일환,김형섭,Ye, Sung-Hyuck,Ryu, Chung-Ho,Hwang, Gyu-Hwan,Seo, Il-Hwan,Kim, Hyung-Sup 한국군사과학기술학회 2011 한국군사과학기술학회지 Vol.14 No.3
Defense Systems Test Center in ADD supports increasingly various missile test requirements such as higher altitude event, multi target operation and low-altitude, high velocity target tracking. In this paper, we have proposed the development of instrumentation radar tracking status simulator based on virtual reality. This simulator can predict the tracking status and risk of failure using several modeling algorithms. It consists of target model, radar model, environment model and several algorithms includes the multipath interference effects. Simulation results show that the predict tracking status and signal are similar to the test results of the live flight test. This simulator predicts and analyze all of the status and critical parameters such as the optimal site location, servo response, optimal flight trajectory, LOS(Line of Sight). This simulator provides the mission plan with a powerful M&S tool to rehearse and analyze instrumentation tracking radar measurement plan for live flight test at DSTC(Defense Systems Test Center).
표적의 자세 변화를 고려한 계측 레이더의 비콘 추적 성능 분석
류충호,예성혁,황규환,서일환,Ryu, Chung-Ho,Ye, Sung-Hyuck,Hwang, Gyu-Hwan,Seo, Il-Hwan 한국군사과학기술학회 2010 한국군사과학기술학회지 Vol.13 No.4
Instrumentation radar in a test range has an important role to measure target's TSPI(time, space, position, information). It is well known that it tracks a target stably using a beacon mode. But it may fail to track a target in a certain region using a beacon mode. In this paper, we modeled a simple missile shape similar to ATCMS with two beacon antenna and analyzed an antenna radiation pattern using MLFMM(Multi Level Fast Multipole Method) method. Using the analyzed result of the radiation pattern of the antenna and the attitude data of target, we simulated beacon tracking performance of an instrumentation radar. As a result of simulation, we showed that an instrumentation radar may lose the target because it tracks a area of the beacon antenna pattern.
황규환,서일환,예성혁,Hwang, Gyu-Hwan,Seo, Il-Hwan,Ye, Sung-Hyuck 한국군사과학기술학회 2006 한국군사과학기술학회지 Vol.9 No.2
As weapon systems are becoming advanced and intelligent, they are designed to have such events like ejecting sub-munitions. So it is continually requested to measure the event time and position exactly. We can measure the event time and position by analyzing the complex signal of the instrumentation radar in the time domain and can also obtain the spin rate of the target by analyzing the complex signal in the frequency domain.
유병직,황규환,류충호,김문기,예성혁,한욱상,Yoo, Byung-Jik,Hwang, Gyu-Hwan,Ryu, Chung-Ho,Kim, Moon-Ki,Ye, Sung-Hyuck,Han, Uk-Sang 한국군사과학기술학회 2012 한국군사과학기술학회지 Vol.15 No.1
We propose the live fire test process model based on systems engineering which consists of 4 phases i.e., review, setup, conduct and result. We also suggest the 4 phases acquisition model consisting of planning, execution, evaluation and disposal for test infrastructure. CMMI, TMMi and PMBOK are referred and hierarchial analysis method are adopted in developing the models. Thus, the detailed sub-processes are designed after defining higher level processes first. The higher level processes are defined by extracting common areas of all the test types. The low level processes for each specific test are designed by tailoring the higher level processes. By applying the proposed test process models into collaboration tool and information system, effective and systematic test processes for weapon systems are established.
윤재혁(Jae-Hyuk Yoon),유승오(Seung-Oh Yoo),이동주(Dong-Ju Lee),예성혁(Sung-Hyuck Ye) 한국전자파학회 2018 한국전자파학회논문지 Vol.29 No.4
본 논문에서는 두 표적 간의 거리차를 정밀하게 계측할 수 있는 S-band 고 분해능 레이다 개발을 위한 시스템 기본 설계 및 구현 결과를 제시한다. 3.5 ㎓ LFM(Linear Frequency Modulation) 레이다 기본 설계를 위하여 제안하는 시스템 요구조건은 거리 분해능 1 m, 최대 계측 거리 2 ㎞이며 레이다 방정식을 통해 각 모듈의 사양을 결정하였다. 최종적으로 150 ㎒ 대역폭, 송신 출력 43 ㏈m 전력 증폭기, 이득 26 ㏈i 안테나, 잡음 지수 8 ㏈ 이하, RCS 1 ㎡일 때, 표적과 레이다의 최대거리 2 ㎞ 기준 SNR이 30 ㏈ 이상이 나올 수 있음을 확인할 수 있었다. 시뮬레이션 결과를 토대로 하드웨어 설계를 하였으며, SDR(Software Defined Radar) 장비를 이용한 LFM 레이다 설계 이론과 방법 그리고 야외 시험 결과를 보여주고 요구조건을 만족하는 레이다 시스템 설계가 가능함을 입증하였다. In this paper, we present the basic design results for high-resolution radar development at S-band frequency that can precisely measure the miss distance between two targets. The basic system requirement is proposed for the design of a 3.5 ㎓ linear frequency-modulated (LFM) radar with maximum detection distance and distance resolution of 2 ㎞ and 1 m, respectively, and the specifications of each module are determined using the radar equation. Our calculations revealed a signal-to-noise ratio ≥ 30 ㏈ with a bandwidth of 150 ㎒, transmission power of 43 ㏈m for the power amplifier, gain of 26 ㏈i for the antenna, noise figure of 8 ㏈, and radar cross-section of 1 ㎡ at a target distance of 2 ㎞ from the radar. Based on the calculation results and the theory and method of LFM radar design, the hardware was designed using software defined radar technology. The results of the subsequent field test are presented that prove that the designed radar system satisfies the requirements.
김민년(Kim Min-Nyun),임중수(Lim Joong-Soo),채규수(Chae Kyu-Su),예성혁(Ye, Sung-Hyuck),류충호(Ryu, Chung-Ho) 한국산학기술학회 2009 한국산학기술학회논문지 Vol.10 No.9
본 논문에서는 다중경로에 의한 추적레이더의 추적 오차를 분석하였다. 기존에 소개된 저고도 추적 레이더 의 연구내용을 분석 하였고 이를 바탕으로 Matlab을 이용한 추적오차 계산용 수치해석 프로그램을 개발하였다. 본 연 구에서는 고도 오차를 계산 할 때 안테나 빔 폭과 지면의 반사계수를 고려하여 좀 더정밀한 오차 계산방법을 제시하였다. 제시된 시뮬레이션 결과들이 이론적인 예측 결과와 잘 일치함을 볼 수 있다. This paper describes the radar tracking errors due to the presence of surface reflected waves. We investigate the previous studies on tracking errors and developed a tracking error estimation program using Matlab. We suggest an accurate error prediction method by considering the antenna beamwidth and surface reflection coefficient. The presented results well agree with theoretical predictions.
예성혁,윤순경,전형준,나극환 한국방송공학회 1996 한국방송공학회 학술대회 Vol.1 No.1
In this paper, The SSPA(Solid State Power Amplifier) is 100watts amplifier which is used with C-Band Satellite Communication Up-Link frequency . 5.875 w 6.425 GHz. SSPA requires more output power than is available from a single GaAs FET with result it is necessary to combine the output of many device. To achieve a high power, it is important to make a good N-way power divider which has a small different phase, good combining efficiency and high power handling capability. The reliability of Power GaAs FET decrease with increasing junction temperature. power amplifier in general dissipate amount of power. It is important to provide them with a heatsink and a temperature compensation circuit to dispose of the unwanted heat. To compensate temperature, Using PIN diode attenuator, it is enable to get a precision gain control. The output power of the SSPA is more than 100watt with which the TWTA (Traveling-Wave Tube Amplifier) can be replaced. Each stage was measured by the Network analyzer HP8510C, Power meter Booton 42BD. The gain is more than 53 dB, flatness is less than 1.5 dB.