• Title/Summary/Keyword: Chirp Pulse Radar

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Development of Digital Chirp Pulse Generator for Fine Resolution Image Radar (고해상도 레이더용 광대역 디지털 첩 펄스 발생기 실험모델 개발)

  • 강경인;임종태;신희섭;전재한
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.34 no.8
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    • pp.104-108
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    • 2006
  • There are range and azimuth direction resolution of synthetic aperture radar on the aircraft or satellite. Wide bandwidth chirp pulse generation technology is prerequisite for SAR image with fine resolution. There are two kinds of digital chirp pulse generation technology as arbitrary waveform generator(AWG) and direct digital synthesizer(DDS). In this paper, we design and implement a digital chirp pulse generator to generate 300MHz wide bandwidth linear FM chirp pulse for the fine resolution image with direct digital synthesizer. Implemented chirp pulse generator can be useful for the SAR sensors to make 50cm range resolution image.

Wideband Chirp Waveform Simulation and Performance Analysis for High Range Resolution Radar Imaging (고해상도 영상 레이다의 광대역 첩 신호 파형 발생 시뮬레이션과 성능 분석)

  • Kwag, Young Kil
    • Journal of Advanced Navigation Technology
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    • v.6 no.2
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    • pp.97-103
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    • 2002
  • A recent technology trends in synthetic aperture radar(SAR) requires the ultra high resolution performance in detecting and precisely identifying the targets. In this paper, as a technique for enhancing the radar range resolution, the wide band chirp connection algorithm is presented by stitching the several chirp modules with unit bandwidth based on the linear frequency modulated chirp signal waveform. The principles of the digital chirp signal generation and its architecture for implementation is described with the wide band chirp signal generator, modulator, and demodulator. The performance analysis for the presented algorithm is given with the simulation results.

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A Study on the Synthetic Aperture Radar Processor using AOD/CCD (AOD/CCD를 이용한 합성개구면 레이다 처리기에 관한 연구)

  • 박기환;이영훈;이영국;은재정;박한규
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.19 no.10
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    • pp.1957-1964
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    • 1994
  • In this thesis, a Synthetic Aperture Rarar Processor that is possible real-time handling is implemented using CW(Continuose Wave) laser as a light source, CCD(charge Coupled Device) as a time integrator, and AOD(Acousto-Optic Device) as the space integrator. One of the advantages of the proposed system is that it does not require driving circuits of the light source. To implement the system, the linear frequency modulation(chirp) technique has been used for radar signal. The received data for the unit target was processed using 7.80 board and accompanying electronic circuits. In order to reduce the smear effect of the focused chirp signal which occurs Bragg diffrection angle of the AOD has been utilized to make sharp pulses of the laser source, and the pulse made synchronized with the chirp signal. Experiment and analysis results of the data and images detected from CCD of the proposed SAR system demonstrated that detection effect is degrated as the unit target distance increases, and the resolving power is improved as the bandwidth of the chirp signal increases. Also, as the pulse width of the light source decreases, the smear effect has been reduced. The experimental results assured that the proposed system in this papre can be used as a real time SAR processor.

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Development of Multi-Band Multi-Mode SDR Radar Platform (다중 대역 다중 모드 SDR 레이다 플랫폼 개발)

  • Kwag, Young-Kil;Woo, In-Sang
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.27 no.11
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    • pp.949-958
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    • 2016
  • This paper presents the new development result of the multi-band, the multi-mode SDR(Software Defined Radar) platform. The SDR hardware platform is implemented by using the reconfigurable multi-band RF transceiver and antenna modules of S, X, and K-bands, and a programmable signal processing module. The SDR software platform is implemented by using the multi-mode waveform generation of CW, Pulse, FMCW, and LFM Chirp as well as the adaptable algorithm library of signal processing and open API software modules. Through the integrated test of the SDR platform, the operational performance was verified in real-time. Also, through the field-application test, the ground target and air-vehicle drone target were successfully detected and their test results were presented.

Inter-Pulse Motion Compensation of an ISAR Image Generated by Stepped Chirp Waveform Using Improved Particle Swarm Optimization (펄스 간 이동 성분을 갖는 계단 첩 파형의 개선된 PSO를 이용한 ISAR 영상 요동 보상)

  • Kang, Min-Seok;Lee, Seong-Hyeon;Park, Sang-Hong;Shin, Seung-Yong;Yang, Eunjung;Kim, Kyung-Tae
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.26 no.2
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    • pp.218-225
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    • 2015
  • Inverse synthetic aperture radar(ISAR) is coherent imaging system formed by conducting signal processing of received data which consists of radar cross section(RCS) reflected from maneuvering target. A novel algorithm is proposed to compensate inter-pulse motion(IPM) for the purpose of forming an well-focused ISAR image through signals generated by stepped chirp waveform( SCW). The velocity and acceleration of the target related to IPM are estimated based on particle swarm optimization (PSO) which has been widely used in optimization technique. Furthermore, a modified PSO which enables us to improve the performance of PSO is used to compensate IPM in a very short-time. Simulation results using point scatterer model of a Boeing-737 aircraft validate the performance of the proposed algorithm.

A Helicopter-borne Pulse Doppler Radar Signal Processor Development using High Speed Multi-DSP (고속 Multi-DSP를 이용한 헬기탑재 펄스 도플러 레이다 신호처리기 개발)

  • Kwag, Young-Kil;Choi, Min-Su;Jeun, In-Pyung;Hwang, Gwang-Yeon;Lee, Kang-Hoon;Lee, Jae-Ho
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2005.11a
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    • pp.23-28
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    • 2005
  • An airborne radar is an essential aviation electronic system of the helicopter to perform various missions in all-weather environments. This paper presents the results of the design and implementation of the airborne pulse doppler radar signal processor using high multi-DSP for the multi-function radar capability such as short-range, midium-range, and long-range depending on the mission of the vehicle. Particularly, the radar signal processor is developed using two DSP boards in parallel for the various radar signal processing algorithm. The key algorithms include LFM chirp waveform-based pulse compression, MTI clutter filter, MTD processor, adaptive CFAR, and clutter map. Especially airborne moving clutter Doppler spectrum compensation algorithm such as TACCAR is implemented for the multi-mode airborne radar system. The test results shows the good Doppler spectral separation for the clutter and the moving target in the flight test environment using helicopter.

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A Helicopter-borne Pulse Doppler Radar Signal Processor Development (헬기탑재 펄스 도플러 레이다 신호처리기 개발)

  • Kwag, Young-Kil;Jeun, In-Pyung;Choi, Min-Su;Hwang, Gwang-Yeon;Lee, Kang-Hoon;Lee, Jae-Ho
    • Proceedings of the IEEK Conference
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    • 2005.11a
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    • pp.443-446
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    • 2005
  • This paper presents the results of the design and implementation of the airborne pulse doppler radar signal processor using high multi-DSP for the multi-function radar capability such as short-range, midium-range, and long-range depending on the mission of the vehicle. Particularly, the radar signal processor is developed using two DSP boards in parallel for the various radar signal processing algorithm. The key algorithms include LFM chirp waveform-based pulse compression, MTI clutter filter, MTD processor, adaptive CFAR, and clutter map. Especially airborne moving clutter Doppler spectrum compensation algorithm such as TACCAR is implemented for the multi-mode airborne radar system. The test results shows the good Doppler spectral separation for the clutter and the moving target in the flight test environment using helicopter

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Drone Detection with Chirp-Pulse Radar Based on Target Fluctuation Models

  • Kim, Byung-Kwan;Park, Junhyeong;Park, Seong-Jin;Kim, Tae-Wan;Jung, Dae-Hwan;Kim, Do-Hoon;Kim, Taihyung;Park, Seong-Ook
    • ETRI Journal
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    • v.40 no.2
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    • pp.188-196
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    • 2018
  • This paper presents a pulse radar system to detect drones based on a target fluctuation model, specifically the Swerling target model. Because drones are small atypical objects and are mainly composed of non-conducting materials, their radar cross-section value is low and fluctuating. Therefore, determining the target fluctuation model and applying a proper integration method are important. The proposed system is herein experimentally verified and the results are discussed. A prototype design of the pulse radar system is based on radar equations. It adopts three different pulse modes and a coherent pulse integration to ensure a high signal-to-noise ratio. Outdoor measurements are performed with a prototype radar system to detect Doppler frequencies from both the drone frame and blades. The results indicate that the drone frame and blades are detected within an instrumental maximum range. Additionally, the results show that the drone's frame and blades are close to the Swerling 3 and 4 target models, respectively. By the analysis of the Swerling target models, proper integration methods for detecting drones are verified and can thus contribute to increasing in detectability.

An Efficient Signal Processor for Interferometric Synthetic Aperture Radar Altimeter (레이더 간섭 고도계 처리 기법 개발)

  • Lee, Dong-Taek;Jung, Hyung-Sup;Yoon, Geun-Won
    • Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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    • 2010.06a
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    • pp.128-129
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    • 2010
  • 기존의 고도계는 레이더 특성에 의해 직하부의 높이 값을 정밀하게 관측할 수 없었다. 그러나 레이더 간섭 고도계는 SAR(Synthetic Aperture Radar) 영상의 칩 펄스(Chirp Pulse)를 이용한 고정밀 경사거리(Slant Range Distance)관측, 도플러 효과를 이용한 고정밀 경사각(Squint Angle)의 관측 및 레이더 간섭기법(SAR Interferometry)을 이용한 고정밀 관측각(Look Angle)의 관측을 가능하게 하였다. 이 연구의 목적은 레이더 간섭 고도계의 효율적인 신호처리 기법의 개발에 있다.

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Analysis on Code Used in Pulse Compression Method for Improving Resolution of Ultrasound Imaging System (초음파 영상 시스템에서의 해상도 개선을 위한 펄스압축기법에 사용되는 코드에 대한 분석)

  • You, Y.M.;Lee, H.H.;Song, T.K.
    • Proceedings of the KOSOMBE Conference
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    • v.1998 no.11
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    • pp.115-116
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    • 1998
  • Pulse echo techniques have been used for the conventional medical ultrasound imaging systems. However, their resolution is limited in the transmitted signal power. To overcome this limit, pulse compression method used in the radar systems was proposed. This system transmits a continuous coded signal and then compresses the received signal into the short and high resolution pulse by using correlator. The reflectors can be detected by cross-correlation between the transmitted signal and the received signal with the depth information. In this paper, we will present a comparative study of the performances of the most common sequences(pseudo-chirp, m-sequences, modified Golay code). The best result for improving resolution is obtained with the modified Golay Code.

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