• Title/Summary/Keyword: 표적 이동

Search Result 271, Processing Time 0.022 seconds

Impact Angle Control for Non-maneuvering Target with Look Angle Measurements and Line of Sight (지향각, 시선각 정보를 이용한 이동표적의 충돌각 제어)

  • Park, Jang-Seong;Lee, Dong-Hee;Park, Sang-Hyuk;Kim, Yoon-Hwan
    • Journal of the Korean Society for Aeronautical & Space Sciences
    • /
    • v.47 no.7
    • /
    • pp.508-516
    • /
    • 2019
  • In this paper, we propose a guidance law to control Impact Angle in consideration of look angle limit of the missile with strapdown seeker on the non-maneuvering target. The proposed law is based on sliding mode algorithm and generates acceleration commands using look angle and line of sight information provided by the strapdown seeker and navigation system. And, target velocity and target path angle are provided by like TADS (Target Acquisition and Designation System) at launch time. We can confirm that the target interception and impact angle control are possible through the convergence of the proposed sliding surface. In addition, it is possible to confirm that the sign of derivative result of the look angle at the maximum and minimum look angle is opposite to the sign of the look angle, so the look angle limit is not exceeded.

합동감기 및 표적공격용 레이다 체계 (JSTARS)

  • Choe, In-Seok
    • Defense and Technology
    • /
    • no.8 s.174
    • /
    • pp.52-61
    • /
    • 1993
  • JSTARS는 일명 Joint STARS라고 하며 원거리에서 고정 및 이동 지상표적을 탐지, 추적하여 그 위치를 지상 지휘관과 공습항공기에 통보함으로써 적을 제압하는 미국 육.공군 합동 지휘통제 체계입니다 이 체계의 개발 동기는 서유럽에 대한 바르샤바군의 공격을 저지하기 위해, 원거리에서 나토(NATO)군이 재래식 무기를 사용하는데 표적 공격의 정확성이 필요하였기 때문입니다

  • PDF

Design of a SIFT based Target Classification Algorithm robust to Geometric Transformation of Target (표적의 기하학적 변환에 강인한 SIFT 기반의 표적 분류 알고리즘 설계)

  • Lee, Hee-Yul;Kim, Jong-Hwan;Kim, Se-Yun;Choi, Byung-Jae;Moon, Sang-Ho;Park, Kil-Houm
    • Journal of the Korean Institute of Intelligent Systems
    • /
    • v.20 no.1
    • /
    • pp.116-122
    • /
    • 2010
  • This paper proposes a method for classifying targets robust to geometric transformations of targets such as rotation, scale change, translation, and pose change. Targets which have rotation, scale change, and shift is firstly classified based on CM(Confidence Map) which is generated by similarity, scale ratio, and range of orientation for SIFT(Scale-Invariant Feature Transform) feature vectors. On the other hand, DB(DataBase) which is acquired in various angles is used to deal with pose variation of targets. Range of the angle is determined by comparing and analyzing the execution time and performance for sampling intervals. We experiment on various images which is geometrically changed to evaluate performance of proposed target classification method. Experimental results show that the proposed algorithm has a good classification performance.

Design and Implementation of Real-Time Emulator (실시간 에뮬레이터의 설계 및 제작)

  • 전문식;최항식;박민용;이상배
    • The Journal of the Acoustical Society of Korea
    • /
    • v.4 no.2
    • /
    • pp.36-47
    • /
    • 1985
  • 본 논문에서는 기존의 ICE 기능을 갖춘 사용이 간편하고, 쉽게 이동이 가능한 저가격 범용 8비 트 마이크로프로세서의 실시간 에뮬레이터를 설계, 제작하고자 한다. ICE의 기능을 구현하기 위해서2개 의 보드 즉 에뮬레이션 보드와 콘트롤 보드를 사용하는 구조로 고안하였다. 에뮬레이션 보드에는 CPU 8085를 사용하고, 콘트롤 보드에는 표적시스템의 CPU와 같은 CPU를 사용하였다. 이러한 구조는 표적 CPU가 바뀔 때 콘트롤 보드만 교환하면 된다는 점에서 실용적이다. 에뮬레이션 보드는 범용 8비트 마 이크로프로세서에 대해서, 콘트롤 보드는 표적 CPU가 Z-80인 시스템에 대해서 제작하였다. 또한, 에뮬 레이터의 기능에 의해, 표적 CPU 자체의 기능이 상실됨을 회복시켰다.

  • PDF

DMAM Based Target Tracking for Automatic Surveillance System (무인 감시시스템을 위한 DMAM기반의 표적 추적)

  • 강이철;제성관;강민경;차의영
    • Proceedings of the Korea Multimedia Society Conference
    • /
    • 2000.11a
    • /
    • pp.147-150
    • /
    • 2000
  • 본 논문은 무인감시 시스템의 특성상 조명 상태의 변화나 카메라의 흔들림과 같은 환경의 변화에 적응할 수 있도록 연속된 세 프레임간의 차영상를 이용하는 방법을 적용하여 움직임 정보를 추출하고, 영역의 분할 및 특징점 추출을 수행한 후에, 인공 신경회로망 기법을 적용하여 이동표적을 추적한다. 추적시에는 추출된 각각의 표적간의 데이터 연결을 움직임 정보의 특징점들을 이용, 레이블링하여 각각의 표적을 연결시켜 추적의 성능을 높였다.

  • PDF

Polar-Format-Processing-Based Moving Target Imaging in MIMO Radar Environment (MIMO 레이다 환경에서 Polar Format Processing 기반 이동표적 이미징)

  • Choi, Sang-Hyun;Yang, Hoon-Gee
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.30 no.2
    • /
    • pp.124-131
    • /
    • 2019
  • This study presents an imaging algorithm that can provide an image of a moving target in a multiple-input-multiple-output radar environment where multiple transmitting and receiving radars are fixed on the ground. The proposed algorithm, which is based on polar format processing using plane wave approximation, is shown to provide an unaliased image by using multiple transmitting radars even when the distances between the receiving radars are relatively large. We derive the conditions necessary to deploy the transmitting radars by which the resolution of the reconstructed image can be improved, while simultaneously reducing aliasing artifacts. Moreover, we offer a means of separating out each transmitting radar target echo. Finally, the performance of the proposed system is verified through a simulation.

Study on a Noble Methodology for the Automatic Decision of Optimal Launch Angle Sequence under Multi-Target Engagement (다수 표적 연속교전 상황에서의 최적 발사각 Sequence 결정 개념 연구)

  • Ryu, Sunmee
    • Journal of the Korea Society for Simulation
    • /
    • v.25 no.3
    • /
    • pp.133-146
    • /
    • 2016
  • To engage multiple missiles in single launcher against multiple targets, launcher system has to operate for optimized launch angle to each target sequentially. If the launch angle sequence is simply defined according to the target assignment order only, overall engagement time would be increased, and even in some engagement scenarios, it could be possible to miss some moving targets being out of proper engagement area. Therefore, the study on methodology for a real-time decision of optimized launch angle sequence is necessary. In this paper, the automatic decision model of launch angle sequence was suggested to minimize total engagement time by analyzing the simulation results of all engagement sequence set for multiple moving target scenario. Performance of proposed methodology for decision of optimal launch angle sequence was verified by comparing with the optimal or suboptimal sequence obtained from simulation results.

Resolving Occlusion Technique of Virtual Target on Real Image using DEM (DEM을 이용한 실영상기반 가상표적의 폐색처리기법)

  • Cha, Jeong-Hee;Jang, Hyo-Jong;Kim, Gye-Young
    • The KIPS Transactions:PartB
    • /
    • v.13B no.7 s.110
    • /
    • pp.663-670
    • /
    • 2006
  • For virtual target to be displaying on real image realistically, it is essential to determine the location of the virtual object together with producing the occlusions area after registering two world. In this paper, we propose the new method to solve occlusions which happens during virtual target moves according to the simulated route on real image. For this purpose, we first construct three dimensional virtual world by DEM of experimental area and register CCD camera image on it by visual clues. Next, we also propose a method to solve the occlusion using snake and picking algorithm which can extract the three dimensional information of the position happening occlusion in the image and can use it when target moves that area. In the experiment, we proved the effectiveness of the proposed method in the environment which a partial occlusions happens.

Comparison of GMTI Performance Using DPCA for Various Clutters (DPCA를 이용한 지상 이동 표적 탐지에서 클러터 종류에 따른 성능 비교)

  • Lee, Myung-Jun;Lee, Seung-Jae;Kang, Byung-Soo;Ryu, Bo-Hyun;Lim, Byoung-Gyun;Oh, Tae-Bong;Kim, Kyung-Tae
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.28 no.6
    • /
    • pp.487-496
    • /
    • 2017
  • Ground moving target indicator(GMTI) using syntheticaperture radar(SAR) used for finding moving targets on wide background clutter in short time is one of good ways to monitor a traffic situation or an enemy's threat. Although displaced phase center antenna (DPCA) is a real time method with low computational complexity, there have been few studies about its performance against various ground clutters. Thus, we need to analyze GMTI performance for various ground clutters in order to design a suitable DPCA detector. In this paper, simulation results show that the conventional DPCA detector produces different performance in terms of detection rate and false alarm rate. In particular, the false alarm rate of heterogeneous or extremely heterogeneous clutter from urban area is higher than one of homogeneous clutter from natural area.

Forward-Looking GMTI and Estimation of Position and Velocity Based on Millimeter-Wave(W-Band) FMCW SAR (밀리미터파(W 밴드) FMCW SAR 기반 전방의 이동지상표적 탐지 및 위치와 속도 추정)

  • Lee, Hyukjung;Chun, Joohwan;Song, Sungchan
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.28 no.6
    • /
    • pp.459-469
    • /
    • 2017
  • An air-to-ground guidance missile aimed to hit a main battle tank(MBT) should detect a ground moving target and estimate the target position to guide. In this paper, we detect a front ground moving target by using FMCW(Frequency Modulated Continuous Wave) and estimate the position by forward-looking SAR(Synthetic Aperture Radar) via scanning certain front ground section by steering a beam with narrow beamwidth left to right mechanically. Also, by MLE(Maximum Likelihood Estimation), degree of how fast the target approach or recede from the radar can be figured out from the estimated radial velocity of the moving target. Subsequently, we generate a radar image via corrected matched filter from phase history including the radial velocity.