• Title/Summary/Keyword: 표적 이동

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DWIT and CF Methods for Automated Target Search on Aerial Images (항공 영상의 자동 표적 탐색을 위한 DWIT와 CF 기법)

  • 유채곤;이성환;이원호;황치정
    • Proceedings of the Korean Information Science Society Conference
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    • 1998.10c
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    • pp.559-561
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    • 1998
  • 항공영상이나 위성영상을 이용하는 원격 감지 기술(Remote Sensing)은 무인 비행, 지리 정보 시스템(GIS) 그리고 도시 계획에 이용되고 있다. 원격 감지 기술과 함께 사용될 수 있는 또 하나의 기술로는 자동 표적 탐색 기술이 있으며 현재 많은 연구가 진행되고 있으나, 대부분 특정적인 시험용 영상에만 적용되고 있어서 항공 영상과 같이 복잡하고 불규칙적인 경우에는 적용이 어렵다. 본 논문에서는 Distance Weighted Intensity Transformation (DWIT)와 Coefficients Filtering(CF) 방법을 이용하여 영상의 이동, 회전, 배경에 불변적인 항공 영상 표적 탐색 기법을 제안한다.

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A Moving Synchronization Technique for Virtual Target Overlay (가상표적 전시를 위한 이동 동기화 기법)

  • Kim Gye-Young;Jang Seok-Woo
    • Journal of Internet Computing and Services
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    • v.7 no.4
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    • pp.45-55
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    • 2006
  • This paper proposes a virtual target overlay technique for a realistic training simulation which projects a virtual target on ground-based CCD images according to an appointed scenario. This method creates a realistic 3D model for instructors by using high resolution GeoTIFF (Geographic Tag Image File Format) satellite images and DTED(Digital Terrain Elevation Data), and it extracts road areas from the given CCD images for both instructors and trainees, Since there is much difference in observation position, resolution, and scale between satellite Images and ground-based sensor images, feature-based matching faces difficulty, Hence, we propose a moving synchronization technique that projects the targets on sensor images according to the moving paths marked on 3D satellite images. Experimental results show the effectiveness of the proposed algorithm with satellite and sensor images of Daejoen.

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Cancelled Predication and Target-Shifting (취소된 서술 행위와 표적 이동)

  • Lee, Seungtaek
    • Korean Journal of Logic
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    • v.22 no.2
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    • pp.309-332
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    • 2019
  • In Kang(2017), Jinho Kang persuasively criticized the attempt of Peter Hanks using his concept of cancelled predication to solve the Frege-Geach problem. According to Kang, Hanks had successfully shown the incoherence of Scott Soames's concept of neutral predication, but if it is true, then Hanks's concept of cancelled predication also falls into the same incoherence. I agree with Kang that Hanks faces the same incoherence, and I think that Hank's answers are unconvincing. As I see, however, it is possible for Hanks to overcome Kang's criticism. In this paper, I will reply to Kang's criticism by using conceptual resources in Hanks's own theory. In particular, the idea is that the final predication is compositionally explained by the type it belongs to without having truth-values because cancelled predication itself gives rise to target-shifting toward the type. By doing so, Hanks can successfully solve the Frege-Geach problem even though he let some remarks about cancelled predication unclear and confusing. In addition, it will be revealed that his notation is misleading as well.

A Method for Data Fusion of Multiple Target Information (다중 표적정보의 융합처리 방안)

  • Ryu, Chul-Hyung;Baek, Joo-Hyun;Jang, Won-Bum;Choi, Joon-Sung
    • Proceedings of the Korea Information Processing Society Conference
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    • 2012.11a
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    • pp.1200-1202
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    • 2012
  • 미래 전장에서 다수의 지상로봇들이 획득한 표적정보는 원격에 위치한 통제장치로 실시간 전송된다. 통제장치는 정찰영상과 디지털 지도위에 지상로봇들의 현재 동작 상태를 표시한다. 본 논문은 다수의 지상로봇들로부터 동일 표적에 대한 위치 정보가 수신될 경우 이에 대한 융합처리 방안을 제안한다. 이러한 융합처리를 통해 표적위치 정확도를 개선할 수 있으며, 이동 경로 추정을 통해 표적의 초기 탐지시간을 단축할 수 있다.

Object Tracking Based on Centroids Shifting with Scale Adaptation (중심 이동 기반의 스케일 적응적 물체 추적 알고리즘)

  • Lee, Suk-Ho;Choi, Eun-Cheol;Kang, Moon-Gi
    • Journal of Korea Multimedia Society
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    • v.14 no.4
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    • pp.529-537
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    • 2011
  • In this paper, we propose a stable scale adaptive tracking method that uses centroids of the target colors. Most scale adaptive tracking methods have utilized histograms to determine target window sizes. However, in certain cases, histograms fail to provide good estimates of target sizes, for example, in the case of occlusion or the appearance of colors in the background that are similar to the target colors. This is due to the fact that histograms are related to the numbers of pixels that correspond to the target colors. Therefore, we propose the use of centroids that correspond to the target colors in the scale adaptation algorithm, since centroids are less sensitive to changes in the number of pixels that correspond to the target colors. Due to the spatial information inherent in centroids, a direct relationship can be established between centroids and the scale of target regions. Generally, after the zooming factors that correspond to all the target colors are calculated, the unreliable zooming factors are filtered out to produce a reliable zooming factor that determines the new scale of the target. Combined with the centroid based tracking algorithm, the proposed scale adaptation method results in a stable scale adaptive tracking algorithm. It tracks objects in a stable way, even when the background colors are similar to the colors of the object.

Doppler Frequency Compensated Detection and Ranging Algorithm for High-speed Targets (도플러 주파수가 보상된 고속 표적 탐지 및 레인징 알고리즘)

  • Youn, Jae-Hyuk;Kim, Kwan-Soo;Yang, Hoon-Gee;Chung, Young-Seek;Lee, Won-Woo;Bae, Kyung-Bin
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.35 no.12B
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    • pp.1244-1250
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    • 2010
  • This paper presents a detection and ranging algorithm for a high-speed targets in the high PRF radar. We show, unlike the conventional methods, it firstly estimates Doppler frequency with a quasi-periodic pulse train prior to range processing. The estimated Doppler frequency can compensate the phase error enbeded in the received signal, which makes the signal integrated coherently in the range direction and localizes the target's signiture in low SNR. We present the derivation of the proposed algorithm and discuss how the system parameters such as the range/Doppler sampling condition, processing time and Doppler estimation error affect the performance of the proposed algorithm, which is verified by simulations.

Target Signal Simulation in Synthetic Underwater Environment for Performance Analysis of Monostatic Active Sonar (수중합성환경에서 단상태 능동소나의 성능분석을 위한 표적신호 모의)

  • Kim, Sunhyo;You, Seung-Ki;Choi, Jee Woong;Kang, Donhyug;Park, Joung Soo;Lee, Dong Joon;Park, Kyeongju
    • The Journal of the Acoustical Society of Korea
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    • v.32 no.6
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    • pp.455-471
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    • 2013
  • Active sonar has been commonly used to detect targets existing in the shallow water. When a signal is transmitted and returned back from a target, it has been distorted by various properties of acoustic channel such as multipath arrivals, scattering from rough sea surface and ocean bottom, and refraction by sound speed structure, which makes target detection difficult. It is therefore necessary to consider these channel properties in the target signal simulation in operational performance system of active sonar. In this paper, a monostatic active sonar system is considered, and the target echo, reverberation, and ambient noise are individually simulated as a function of time, and finally summed to simulate a total received signal. A 3-dimensional highlight model, which can reflect the target features including the shape, position, and azimuthal and elevation angles, has been applied to each multipath pair between source and target to simulate the target echo signal. The results are finally compared to those obtained by the algorithm in which only direct path is considered in target signal simulation.

K-Band Radar Development for the Ground Moving Vehicle (지상 이동 차량용 K-대역 레이다 개발)

  • Lee, Jong-Min;Cho, Byung-Lae;Sun, Sun-Gu;Lee, Jung-Soo;Park, Sang-Soon
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.22 no.3
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    • pp.362-370
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    • 2011
  • This paper presents a K-band radar system installed on the ground moving vehicle to detect and track a high-speed target. The presented radar is separated into three search regions to satisfy a wide area detection and a limitation of the installing space of the radar, and each region performs detecting the target independently and tracking the detected target automatically. The presented radar radiating K-band FMCW waveform acquires range and velocity information of the target at the every dwell and receiving antenna of the radar is applied the multiple baseline interferometer to extract the precise angle information of the target. 3-dimensional tracking accuracy of the radar is 0.25 m RMSE measured actually through a fire experiment of an imitation target.

A Survey on Moving Target Indication Techniques for Small UAVs : Parametric Approach (소형 무인항공기용 이동표적 표시기법에 대한기술 동향 분석 : 매개변수방식)

  • Yun, Seung Gyu;Kang, Seung Eun;Ko, Sang Ho
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.42 no.7
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    • pp.576-585
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    • 2014
  • In this paper, we survey the Moving Target Indication(MTI) techniques for small UAVs. MTI consists of image alignment phase and frame differencing correction phase, and image alignment has two ways of parametric approach which is mainly focused in this paper and non-parametric approach. Since small UAVs are operated in the low altitude, the parallax is considerable and the epipolar geometry is applied to compensate the parallax. The related works and future works are presented.

Analysis of High Resolution Range Estimation for Moving Target Using Stepped Frequency Radar with Coherent Pulse Train (코히어런트 펄스열을 갖는 계단 주파수 레이더를 이용한 이동표적의 고해상도 거리 추정 분석)

  • Sim, Jae-Hun;Bae, Keun-Sung
    • Journal of IKEEE
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    • v.22 no.3
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    • pp.599-604
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    • 2018
  • A Stepped Frequency Radar(SFR) is a method that realizes high resolution range estimation by increasing the frequency of transmission pulses at regular intervals to generate a wide synthetic bandwidth. However, in the case of a moving target, accurate range estimation becomes difficult due to the range-Doppler coupling. In this paper, the process of high resolution range estimation by compensation of the range-Doppler coupling with estimated velocity of the moving target using the SFR waveform with Coherent Pulse Train(CPT) is analyzed and it was verified through simulation.