• Title/Summary/Keyword: Ground Vehicle Targets

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A Dataset of Ground Vehicle Targets from Satellite SAR Images and Its Application to Detection and Instance Segmentation (위성 SAR 영상의 지상차량 표적 데이터 셋 및 탐지와 객체분할로의 적용)

  • Park, Ji-Hoon;Choi, Yeo-Reum;Chae, Dae-Young;Lim, Ho;Yoo, Ji Hee
    • Journal of the Korea Institute of Military Science and Technology
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    • v.25 no.1
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    • pp.30-44
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    • 2022
  • The advent of deep learning-based algorithms has facilitated researches on target detection from synthetic aperture radar(SAR) imagery. While most of them concentrate on detection tasks for ships with open SAR ship datasets and for aircraft from SAR scenes of airports, there is relatively scarce researches on the detection of SAR ground vehicle targets where several adverse factors such as high false alarm rates, low signal-to-clutter ratios, and multiple targets in close proximity are predicted to degrade the performances. In this paper, a dataset of ground vehicle targets acquired from TerraSAR-X(TSX) satellite SAR images is presented. Then, both detection and instance segmentation are simultaneously carried out on this dataset based on the deep learning-based Mask R-CNN. Finally, this paper shows the future research directions to further improve the performances of detecting the SAR ground vehicle targets.

Acquiring Precise Coordinates of Ground Targets through GCP Geometric Correction of Captured Images in UAS (무인 항공 시스템에서 촬영 영상의 GCP 기하보정을 통한 정밀한 지상 표적 좌표 획득 방법)

  • Namwon An;Kyung-Mee Lim;So-Young Jeong
    • Journal of the Korea Institute of Military Science and Technology
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    • v.26 no.2
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    • pp.129-138
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    • 2023
  • Acquiring precise coordinates of ground targets can be regarded as the key mission of the tactical-level military UAS(Unmanned Aerial System) operations. The coordinates deviations for the ground targets estimated from UAV (Unmanned Aerial Vehicle) images may depend on the sensor specifications and slant ranges between UAV and ground targets. It has an order of several tens to hundreds of meters for typical tactical UAV mission scenarios. In this paper, we propose a scheme that precisely acquires target coordinates from UAS by mapping image pixels to geographical coordinates based on GCP(Ground Control Points). This scheme was implemented and tested from ground control station for UAS. We took images of targets of which exact location is known and acquired the target coordinates using our proposed scheme. The experimental results showed that errors of the acquired coordinates remained within an order of several meters and the coordinates accuracy was significantly improved.

Implementation of High-Resolution Angle Estimator for an Unmanned Ground Vehicle

  • Cha, SeungHun;Yeom, DongJin;Kim, EunHee
    • Journal of electromagnetic engineering and science
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    • v.15 no.1
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    • pp.37-43
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    • 2015
  • We implemented a real-time radar system for an unmanned ground vehicle designed to run on unpaved or bumpy roads. The system must be able to detect slow targets in a cluttered environment and cover wide angular sections with high resolution at the same time. The system consists of array antennas, preprocessors for digital beam forming, and digital signal processors for the detection process which uses sawtooth waveforms and high-resolution estimation, and is called forward/backward spatial smoothing beamspace multiple signal classification (FBSS BS-MUSIC). We show that the sawtooth waveforms enhance the angular estimation capability of FBSS BS-MUSIC in addition to their well-known advantages of removing the ambiguity of targets and detecting slow targets with improved velocity resolution.

Performance Analysis of Deep Learning-Based Detection/Classification for SAR Ground Targets with the Synthetic Dataset (합성 데이터를 이용한 SAR 지상표적의 딥러닝 탐지/분류 성능분석)

  • Ji-Hoon Park
    • Journal of the Korea Institute of Military Science and Technology
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    • v.27 no.2
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    • pp.147-155
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    • 2024
  • Based on the recently developed deep learning technology, many studies have been conducted on deep learning networks that simultaneously detect and classify targets of interest in synthetic aperture radar(SAR) images. Although numerous research results have been derived mainly with the open SAR ship datasets, there is a lack of work carried out on the deep learning network aimed at detecting and classifying SAR ground targets and trained with the synthetic dataset generated from electromagnetic scattering simulations. In this respect, this paper presents the deep learning network trained with the synthetic dataset and applies it to detecting and classifying real SAR ground targets. With experiment results, this paper also analyzes the network performance according to the composition ratio between the real measured data and the synthetic data involved in network training. Finally, the summary and limitations are discussed to give information on the future research direction.

The Study of Improve Safety for Signaling System using Communication (통신에 의한 신호시스템의 안전성 확보에 대한 연구)

  • 백종현;한성호;안태기;온정근
    • Proceedings of the KSR Conference
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    • 1999.05a
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    • pp.307-314
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    • 1999
  • The potential use of ranging sensors for reducing the occurrence of accidents in real environment is explored by many companies and laboratories. Most of the sensors under investigation utilize the FMCW(Frequency Modulated Continuous Wave) waveforms. The automotive environment presents to the FMCW radar sensor a multitude of moving and fixed targets and the sensor must detect and track only the targets which may pose a threat of collision or passengers accident. The sensor must function accurately in the presence of background echoes generated by moving and fixed targets, ground reflections, atmospheric noises, including rains, fog, and, snow and noise generated within the receiver. False detection of the desired target in this environment may issue false alarms. That may be dangerous to the passenger and the vehicle. A high false alarm rate is totally unacceptable. The false alarm mechanism consists of noise peaks, crossing the threshold and the undesired response of the system to off lane targets which are not potentially hazardous to the radar equipped vehicle. This paper presents an improve technique safety performance for driver-less operation using FMCW radar sensors.

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The Study of Improved Safety of Signalling System using Communication (통신에 의한 신호시스템의 안전성 확보에 관한 연구)

  • Baek, Jong-Hyen;Wang, Jong-Bae;Byun, Yeun-Sub;Park, Hyun-Jun;Han, Young-Jae;Kim, Kil-Dong
    • Proceedings of the KIEE Conference
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    • 2000.07b
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    • pp.1368-1370
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    • 2000
  • The automotive environment presents to the FMCW radar sensor a multitude of moving and fixed targets and the sensor must detect and track only the targets which may pose a threat of collision or passengers accident. The sensor must function accurately in the presence of background echoes generated by moving and fixed targets, ground reflections, atmospheric noises, including rains, fog, and, snow and noise generated within the receiver. False detection of the desired target in this environment may issue false alarms. That may be dangerous to the passenger and the vehicle. A high false alarm rate is totally unacceptable. The false alarm mechanism consists of noise peaks, crossing the threshold and the undesired response of the system to off lane targets which are not potentially hazardous to the radar equipped vehicle. This paper presents an improve technique safety performance for driver-less operation using FMCW radar sensors.

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Imprementation of Real Time HILS System for Ground Test of Underwater Vehicle (수중 운동체의 육상 모의시험을 위한 실시간 HILS 시스템 구현)

  • Park, Yeong-Il;Choi, Young-Chul;Cho, Kyu-Kab;Lee, Man-Hyung
    • Journal of Korean Institute of Industrial Engineers
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    • v.25 no.2
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    • pp.282-289
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    • 1999
  • To minimize a real world test of underwater guided vehicle, it is necessary to perform a test on ground by using closed loop test techniques. This paper describes implementation of HILS(Hardware In the Loop Simulation) system for ground test and test methodologies for performance evaluation of a guided weapon. HILS system uses a real time distributed computer and a real time processing technique. Ground test results of underwater vehicle are presented for moving and stationary targets by using HILS system.

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Autonomous Unmanned Vehicle based Self-locomotion Network for Tracking Targets in Group Mobility (그룹이동타겟 추적을 위한 무인차량기반의 자가이동 네트워크)

  • Tham, Nguyen Thi;Yoon, Seok-Hoon
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.37 no.7C
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    • pp.527-537
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    • 2012
  • In this paper, we propose unmanned vehicle based tracking network (UVTN) architecture and algorithms which employ multiple autonomous unmanned ground vehicles (AUGV) to efficiently follow targets in a group. The goal of UVTN is to maximize the service coverage while tracking target nodes for monitoring or providing the network access. In order to achieve this goal, UVTN performs periodic expansion and contraction which results in optimized redistribution of AUGV's in the network. Also, enhanced algorithms such as fast contraction and longest first are also discussed to improve the performance of UVTN in terms of the average coverage ratio and traveled distance. Simulation results show that the proposed UVTN and enhanced algorithms can effectively track the moving target and provide the consistent coverage.

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

  • Lee, Seung-Youn;Choe, Tok-Son;Jung, Young-Hun;Lee, Seok-Jae;Yoon, Joo-Hong
    • Journal of the Korea Institute of Military Science and Technology
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    • v.15 no.3
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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.

A Study on the Laser Designator for the Missile System Using Semi-Active Laser Seeker (반능동 레이저 탐색기를 사용하는 유도무기체계의 레이저 조사기 연구)

  • Bae, Minji;Ha, Jaehoon;Park, Heechan
    • Journal of the Korea Institute of Military Science and Technology
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    • v.23 no.5
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    • pp.466-474
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    • 2020
  • Semi-active laser missile systems with high accuracy are necessary to asymmetric threats, such as UAV(Unmanned Aerial Vehicle). They are usually used to attack stationary or slow moving targets, therefore we should study on the laser designator which can detect and track fast moving targets in order to deal with UAV. In this study, design specifications are came up through performance analysis of existing laser designators, and laser designation method for fast moving target is developed. The detection and tracking performance of developed laser designator are verified through inside/outside tests on ground/aerial stationary/moving targets. Through this study, we obtain laser designator techniques that could be applied to actual semi-active laser missile systems.