• Title/Summary/Keyword: 레이다

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Time Synchronization Using Mutual Interference in Two FMCW Radars (두 대의 FMCW 레이다에서 레이다간 상호 간섭 신호를 이용한 시간동기화 방법)

  • Cho, Byung-Lae;Lee, Jung-Soo;Lee, Jong-Min;Sun, Sun-Gu
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.23 no.11
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    • pp.1323-1326
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    • 2012
  • In military applications, many radar systems are simultaneously operated at a close range. In particular, the frequency allocation must be executed for operating the homogeneous radar systems at the same time. As many radar systems are simultaneously operated with overlapping frequency bands, interference between systems inevitably occurs. Because interference can degrade radar performance, suppression of interference is a critical issue in radar systems. In this letter, we analyze the interference between two FMCW radars. In addition, time synchronization method between radars using mutual interference is proposed. Experiments are carried out to validate the proposed method. The results demonstrate that the proposed method is suitable for real radar systems.

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
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    • v.30 no.2
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    • pp.124-131
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    • 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.

Beam Scheduling and Task Design Method using TaP Algorithm at Multifunction Radar System (다기능 레이다 시스템에서 TaP(Time and Priority) 알고리즘을 이용한 빔 스케줄링 방안 및 Task 설계방법)

  • Cho, In-Cheol;Hyun, Jun-Seok;Yoo, Dong-Gil;Shon, Sung-Hwan;Cho, Won-Min;Song, Jun-Ho
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.21 no.1
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    • pp.61-68
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    • 2021
  • In the past, radars have been classified into fire control radars, detection radars, tracking radars, and image acquisition radars according to the characteristics of the mission. However, multi-function radars perform various tasks within a single system, such as target detection, tracking, identification friend or foe, jammer detection and response. Therefore, efficient resource management is essential to operate multi-function radars with limited resources. In particular, the target threat for tracking the detected target and the method of selecting the tracking cycle based on this is an important issue. If focus on tracking a threat target, Radar can't efficiently manage the targets detected in other areas, and if you focus on detection, tracking performance may decrease. Therefore, effective scheduling is essential. In this paper, we propose the TaP (Time and Priority) algorithm, which is a multi-functional radar scheduling scheme, and a software design method to construct it.

Implementation of Optimum Radar Signal Processor Using Adaptive Whitening Filter (적응 Whitening 필터를 이용한 최적 레이다 신호처리기의 구현)

  • 김기만
    • Proceedings of the Acoustical Society of Korea Conference
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    • 1991.06a
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    • pp.157-162
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    • 1991
  • 본 연구에서는 적응 whitening 필터를 이용하여 최적 레이다 신호처리기를 구현하였다. 사용된 필터는 Gram-Schmidt와 lattice 구조를 가지며, 이들을 이용하여 레이다 clutter를 제거하고, 프로세서 특성을 원하는 표적신호에 일치시킨다. 또한 필터 계수들을 변화하는 레이다 환경에 따라 조정하기 위하여 여러 가지 적응 알고리듬을 적용하였다. 실험결과 구현된 시스템은 빠른 수렴 특성을 갖고 있으며, 역행렬 연산이 필요없기 때문에 향상 안정된 특성을 보임을 알 수 있다.

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Multi-functional Fighter Radar Scheduling Method for Interleaved Mode Operation of Airborne and Ground Target (전투기탑재 다기능 레이다의 공대공 및 공대지 동시 운용 모드를 위한 스케줄링 기법)

  • Kim, Do-Un;Lee, Woo-Cheol;Choi, Han-Lim;Park, Joontae;Park, Junehyune;Seo, JeongJik
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.49 no.7
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    • pp.581-588
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    • 2021
  • This paper deals with a beam scheduling method in fighter interleaving mode. Not only the priority of tasks but also operational requirements that air-to-ground and air-to-air search tasks should be executed alternatively are established to maximize high-quality of situational awareness. We propose a real-time heuristic beam scheduling method that is advanced from WMDD to satisfies the requirements. The proposed scheduling method is implemented in a simulation environment resembling the task processing mechanism and measurement model of a radar. Performance improvement in terms of task delay time is observed.

Study on Class Separability Measure for Radar Signals (레이다 신호의 클래스 분리도 측정을 위한 연구)

  • Jeong, Seong-Jae;Lee, Seung-Jae;Kim, Kyung-Tae
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.29 no.2
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    • pp.128-137
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    • 2018
  • In this paper, we propose a novel class separability measure for radar signals. To reduce the sensitivity of the relative aspect angle between a target and radar, to evaluate the discriminatory power of radar signals, the proposed method first calculates the correlation coefficients between two radar cross sections (RCSs) or linearly shifts one-dimensional (1D) radar signals (i.e., high-resolution range profiles (HRRPs)), or rotates two 2D radar signals (i.e., inverse synthetic aperture radar (ISAR) images). Then, it uses the maximum correlation coefficient when two radar signals are best aligned. Next, the proposed method obtains new correlation-based discriminant matrices (CDM) using maximum correlation coefficients. Finally, the cumulative distribution function (CDF) in the CDM and the value corresponding to the specific probability in the CDF are obtained, and this value represents the discriminatory power of the radar signal. Experimental results show that the proposed method can accurately measure the target separability.

TB and Knapsack Based Improved Scheduling Techniques for Multi-Function Radar (TB와 냅색 기반의 향상된 다기능 레이다 스케줄링 기법)

  • Hwang, Min-Young;Yang, Woo-Young;Shin, Sang-Jin;Chun, Joohwan
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.29 no.12
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    • pp.976-985
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    • 2018
  • Modern radars such as the phase array radar can handle various tasks by generating a beam from a phased array antenna. Radar can be used for miscellaneous applications such as surveillance, tracking, missile guidance etc. Previous radar systems could handle only one task at a time. As such, multiple radars were required to perform simultaneous tasks. Multi-function radars can perform many tasks using only one radar system. However, the radar's resources are limited in this instance. To efficiently utilize time, it is necessary to properly schedule tasks in the radar's timeline. In this report, we investigate the efficiency of different scheduling tasks.

Analysis of Deception Jamming Effects on FM Radio based Passive Radar (FM 라디오 기반 수동형 레이다 기만재밍 효과 분석)

  • Song, Kyuha;Kwak, Hyungyu;Kim, Sanhae;Jeong, Inhwan;Lee, Jonghwan;Lee, Byeongnam
    • Journal of the Korea Institute of Military Science and Technology
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    • v.25 no.3
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    • pp.239-250
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    • 2022
  • In this paper, we analyze the performance of an FM radio based passive radar in the presence of deception jamming such as false-target generation. To do this, we examine the effects of applying the deception jamming signal to the passive radar through the derivation of the construction of the amplitude-range-Doppler(ARD) plot. The analysis results show that applying the deception jamming signal with the low power similar to the target echo signal generates false targets at positions set by the jamming variables compared to the real target position in the ARD plot. Also, it is possible to induce the jamming effect so that only false targets are detected by selecting appropriate jamming power. Simulations are included to verify the theoretical results and to discuss on the effectiveness of the deception jamming on the FM radio based passive radar.

Real-time Implementation of Phased RF Sub-Array MIMO Algorithm for Radar (레이다용 Phased RF Sub-Array MIMO 알고리즘 실시간 구현)

  • Wansik Kim;Hwanyong Yeo
    • The Journal of the Convergence on Culture Technology
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    • v.9 no.5
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    • pp.517-522
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    • 2023
  • Existing radars have been developed by applying RF sub-array algorithms, and recently, fully digital Multiple-Input Multiple-Output (MIMO) radar algorithms have been implemented for vehicle radars. In this paper, the radar algorithm applying the Phased MIMO method to the hardware of the RF sub-array method, which is an unsecured technology, was implemented and verified in real time. In order to secure RF sub-array Phased MIMO algorithm technology, a hardware structure for FPGA-based real-time signal processing was presented, and performance was first predicted through design and simulation. Through this, the digital signal of FPGA-based broadband MIMO FMCW radar The processing hardware was developed, and the Phased MIMO radar algorithm of the RF sub-Array method was finally implemented and verified in real time. Based on this, it is judged that it will be possible to secure and apply core technologies necessary for terahertz band radar in the future.

위성 영상 레이다(SAR) 기술 동향

  • Gwak, Yeong-Gil
    • The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
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    • v.22 no.6
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    • pp.4-16
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    • 2011
  • 영상 레이다(Synthetic Aperture Radar: SAR)는 기상조건이나 주야에 관계없이 전천후로 광범위한 지역의 영상을 고해상도로 얻을 수 있는 능동형 전자파 레이다 센서이다. 최근 세계적으로 위성 SAR는 2010년을 기점으로 최근 3~4년 사이에 유사이래 가장 많은 13개 이상의 저궤도 소형 SAR 위성들을 발사함에 따라 비로소 "저궤도 위성 SAR 전성기"로 진입하게 되었다. 우리나라에서도 아리랑위성 5호(KOMPSAT-5)에 SAR를 탑재하는 최초의 레이다 위성을 올해 2011년에 발사할 계획을 가지고 있으나 아직 발사가 지연되고 있다. 본 기고에서는 2011년 9월 27~30일 서울에서 개최된 국제 영상 레이다 학술 대회 APSAR 2011(Asia-Pacific Conference on Synthetic Aperture Radar)의 성공을 기념하여 마련된 SAR 기술 특집호에 최신 위성 SAR 개발 동향을 중심으로 기술 발전 추세와 전망에 대하여 소개한다.