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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.
황규환(Gyu-Hwan Hwang),김문기(Moon-Ki Kim),강도근(Do-Keun Kang) 대한전기학회 2012 전기학회논문지 Vol.61 No.7
We display important test information from radar, telemetry in real time for monitoring and control of guided missile flight test. Clearing test area is the most important thing for safety. Thus, we have to constantly monitor and control ships around the test area. Several maritime surveillance radars are deployed around the test area for that purpose. However, multiple points are displayed for the same target when using multiple surveillance radars and this confuses the test personnel during the mission. In this paper, we suggested a method to solve this problem by analyzing error factor of surveillance radar and comparing the correlation of each radar data.
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.
류충호,황규환,장용식,김문기,최익환,Ryu, Chung-Ho,Hwang, Gyu-Hwan,Jang, Yong-Sik,Kim, Moon-Ki,Choi, Ik-Hwan 한국군사과학기술학회 2013 한국군사과학기술학회지 Vol.16 No.2
In general, radial velocity of a target can be obtained by acquiring doppler frequency shift in case of a doppler radar, or can be obtained by acquiring range rate in case of a pulse radar. Then radial velocity can be converted to tangential velocity using aspect angle or position variation per unit time. These two ways have the same meaning in physically, but result in different uncertainty finally. In this paper, it is described not only the two transformation procedures to calculate tangential velocity from radar measurement data, but also the result of combined uncertainty comparison between these two procedures.
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.
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).
다중 레이더 환경에서의 바이어스 오차 추정의 가관측성에 대한 연구와 정보 융합
원건희(Gun Hee Won),송택렬(Taek Lyul Song),김다솔(Da Sol Kim),서일환(Il Hwan Seo),황규환(Gyu Hwan Hwang) 제어로봇시스템학회 2011 제어·로봇·시스템학회 논문지 Vol.17 No.8
Target tracking performance improvement using multi-sensor data fusion is a challenging work. However, biases in the measurements should be removed before various data fusion techniques are applied, In this paper, a bias removing algorithm using measurement data from multi-radar tracking systems is proposed and evaluated by computer simulation. To predict bias estimation performance in various geometric relations between the radar systems and target, a system observability index is proposed and tested via computer simulation results. It is also studied that target tracking which utilizes multi-sensor data fusion with bias-removed measurements results in better performance.