• 제목/요약/키워드: target

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다중빔 방식의 FMCW 레이더 표적신호 시뮬레이터 개발 (Development of Target Signal Simulator for Multi-Beam Type FMCW Radar)

  • 이승연;최덕선;정영헌;이석재;윤주홍
    • 한국군사과학기술학회지
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    • 제15권3호
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    • pp.343-349
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    • 2012
  • To detect targets for autonomous navigation of unmanned ground vehicle, mounted sensors are required to work all-weather condition. In this point of view, the FMCW radar is quietly appropriate. In this paper, we present development results of target signal simulator for multi-beam type FMCW radar. A target signal simulator make pseudo target signals which simulates multiple moving targets. And we describe how to make hit information for each target in multi-beam type radar. The developed methods are utilized for target tracking device. Moreover it can be applied to similar target signal simulator.

능, 수동센서를 이용한 수중환경에서의 표적추적필터 구조 연구 (A Study on Target Tracking Filter Architecture in Underwater Environment using Active and Passive Sensors)

  • 임영택;서태일
    • 한국군사과학기술학회지
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    • 제18권5호
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    • pp.517-524
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    • 2015
  • In this paper, we propose a new target tracking filter architecture using active and passive sensors in underwater environment. A passive sensor for target tracking needs a bearing measurement of target. And target tracking filter for using passive sensor has the observability problem. On the other hand, an active sensor does not have the problem associated with system observability problem because an active sensor uses bearing and range measurement. In this paper, the tracking filter algorithm that could be used in the active and passive sensor system is proposed to analyze maneuvering target and to improve target tracking performance. The proposed tracking filter algorithm is tested by a series of computer simulation runs and the results are analyzed and compared with existing algorithm.

클러터가 존재하는 환경에서의 HPDA를 이용한 다중 표적 자동 탐지 및 추적 알고리듬 연구 (A Study of Automatic Multi-Target Detection and Tracking Algorithm using Highest Probability Data Association in a Cluttered Environment)

  • 김다솔;송택렬
    • 전기학회논문지
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    • 제56권10호
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    • pp.1826-1835
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    • 2007
  • In this paper, we present a new approach for automatic detection and tracking for multiple targets. We combine a highest probability data association(HPDA) algorithm for target detection with a particle filter for multiple target tracking. The proposed approach evaluates the probabilities of one-to-one assignments of measurement-to-track and the measurement with the highest probability is selected to be target- originated, and the measurement is used for probabilistic weight update of particle filtering. The performance of the proposed algorithm for target tracking in clutter is compared with the existing clustering algorithm and the sequential monte carlo method for probability hypothesis density(SMC PHD) algorithm for multi-target detection and tracking. Computer simulation studies demonstrate that the HPDA algorithm is robust in performing automatic detection and tracking for multiple targets even though the environment is hostile in terms of high clutter density and low target detection probability.

이동하는 표적의 방사소음 합성기법 연구 (Research on Synthesis of Radiation Noise from Moving Target)

  • 배재휘
    • 한국군사과학기술학회지
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    • 제3권1호
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    • pp.58-65
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    • 2000
  • A target signal simulation method for passive sonar systems is introduced. The method uses multirate signal processing techniques to simulate moving target signals in the multi-path sound propagation environment by introducing Lloyd's mirror and Doppler effect. Time and frequency variation of target signal due to the target maneuvering is also considered to provide realistic ship signatures in the LOFAR gram so that the simulated target is used for sonar operator training. Synthesized target characteristics is analyzed and compared with real target signal in terms of interference pattern and frequency variation in the LOFAR gram.

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함정용 레이더의 표적 속도 보상 방법 (A Method of Velocity Compensation of Target for the Naval Radar System)

  • 조원민
    • 한국군사과학기술학회지
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    • 제12권4호
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    • pp.508-515
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    • 2009
  • In the naval environment, a naval radar has many obstructions of velocity, such as rotation and velocity of ship. In the common situation, the rotations such as roll, pitch and yaw don't influence the velocity of the target. But because the naval radar is located on the top of the mast, there is some influence to the target velocity. When we trace the target, radar controller doesn't use hits whose doppler banks are zero. So, we must compensate the target velocity for the velocity error. This paper suggests a method of velocity compensation of target by the velocity vector and how to apply to the stack beam radar if we don't know the height of the target.

무인비행체 풍동시험과 공력해석의 비교 연구 (A COMPARISON STUDY OF WIND TUNNEL TEST AND AERODYNAMIC ANALYSIS FOR TARGET DRONE)

  • 김현일;김재성;이상민;김규태;김맹수
    • 한국전산유체공학회:학술대회논문집
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    • 한국전산유체공학회 2010년 춘계학술대회논문집
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    • pp.17-20
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    • 2010
  • An aerial target system is used for the purpose of experimental test and fire training of missile that newly developed and in mass production. Since the target drones of aerial target systems are monopolized by several major countries so that they are selling at a high price. In this paper, we present the CFD simulation results on a new target drone that Kyungan co. ltd is developing with their own technologies. The presented CFD simulation was conducted in the same conditions of a wind tunnel tests and we could obtain the simulation results of the lift and drag values were in errors by less than 15 percent compared to the experiment. The simulation results were used to determine the modified shapes of new prototype target drone that could fly safely.

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Convergence Control of Moving Object using Opto-Digital Algorithm in the 3D Robot Vision System

  • Ko, Jung-Hwan;Kim, Eun-Soo
    • Journal of Information Display
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    • 제3권2호
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    • pp.19-25
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    • 2002
  • In this paper, a new target extraction algorithm is proposed, in which the coordinates of target are obtained adaptively by using the difference image information and the optical BPEJTC(binary phase extraction joint transform correlator) with which the target object can be segmented from the input image and background noises are removed in the stereo vision system. First, the proposed algorithm extracts the target object by removing the background noises through the difference image information of the sequential left images and then controlls the pan/tilt and convergence angle of the stereo camera by using the coordinates of the target position obtained from the optical BPEJTC between the extracted target image and the input image. From some experimental results, it is found that the proposed algorithm can extract the target object from the input image with background noises and then, effectively track the target object in real time. Finally, a possibility of implementation of the adaptive stereo object tracking system by using the proposed algorithm is also suggested.

수중표적의 고주파수 CW 펄스신호 반사를 위한 하이라이트 분포 모델링 해석 (An Analysis of Highlight Distribution Modeling for High Frequency CW Pulse Signal Reflection on Underwater Target)

  • 김부일;이형욱;박명호;권우현
    • 한국시뮬레이션학회논문지
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    • 제9권3호
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    • pp.1-11
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    • 2000
  • This paper proposes the practical echo-signal synthesis models - UTAHID (Underwater TArget by Highlight Distribution) & M-UTAHID(Modified UTAHID) - of underwater target for active sonar engineering At high frequencies all the echo components that are the specular reflected waves and various elastic scattering wave scan be regarded the summation of individual echo from some equivalent scattering centers, so the underwater target is characterized by highlights distributed in spatial target structure. Proposed models are compared with characteristics of random distributed model & equivalent interval highlight model, and analyzed target strength, echo-elongation effect, target time spread loss and so on. Thus these can be efficiently used in various real systems related to underwater target echo-signal synthesis on active sonar and acoustic countermeasure.

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해저고정 소나표적의 위치교정기법과 오차해석 (A Calibration Technique and its Error Analysis for the Position of Seabed Sonar Target)

  • 이상국;이용곤
    • 한국군사과학기술학회지
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    • 제6권3호
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    • pp.15-21
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    • 2003
  • This paper contains a precise calibration technique for the position of seabed acoustic target and theoretical error analysis of calibration results. The target is deployed on seabed as a standalone transponder. The purpose of target is performing accuracy test for active sonar as well as position calibration itself. For the position calibration, relative range between target and test vessel should be measured using target's transponder function. The relative range data combined with vessel position can be converted into a estimated position of target by the application of nonlinear LSE method. The error analysis of position calibration was divided into two stages. One is for relative range estimator and the other for target position estimator. Numerical simulations for position calibration showed good matching between results and developed CRLB.

스캔라인 알고리즘을 이용한 대화력전 임기표적의 실시간 영역 결정 (Real-time Processing for Target of Opportunity Positioning of Counter-fire with Scan-line Algorithm)

  • 전기윤
    • 한국군사과학기술학회지
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    • 제10권2호
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    • pp.148-151
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    • 2007
  • The CF(Counter-fire) is neutralizing enemy's all command control systems and fire support elements. It will weaken a battle continuous ability and an intension to fight. At the beginning of the CF is obtaining locations of targets using various detection assets. CF command center processes acquired target information and send it to attacking equipments. The targets are classified into two classes, preplanned target and target of opportunity The target of opportunity is potential threaten, so it needs to take a immediate and exact process for determining location of target of opportunity. This paper proposes the real-time processing algorithm for offensive weapons to strike target of opportunity, and presents the result of its performance.