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KIGAMKIGAMKIGAMKIGAM
ArcSAR 시스템 설계 및 제작ArcSAR 시스템 설계 및 제작
2009. 3. 27. 2009. 3. 27. 대한원격탐사학회 춘계학술발표회 대한원격탐사학회 춘계학술발표회
1) 조성준 , 2) 이훈열 , 1) 김광은 , 2)1) 이재희 , 1) 성낙훈1) 한국지질자원연구원2) 강원대학교 지구물리학과
Engineering geophysicsEngineering geophysics
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Agenda
• 연구배경 및 목적• Concept of ArcSAR• Hardware configuration of ArcSAR• Imaging geometry of ArcSAR• Arc rail system• 향후 추진 계획
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연구배경 및 목적
• 레일형 GB-SAR 는 반복측정을 통해 mm 이내의 변형까지 감지할 수 있는 높은 분해능을 자랑
• 레일을 모니터링 위치에 고정시켜야 하는데 고정밀 레일의 제작비용이 매우 비싸며 , 측정장치의 운반과 설치 역시 매우 복잡
• 차량에 원형레일을 탑재하여 신속한 기동을 확보• 합성구경의 길이를 늘리며 영상영역을 확장한 Arc-
SAR 개발
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GB-SAR(KIGAM-KNU)
DInSAR tested: Phase stability of 1° (0.1mm range) was achieved for several hours for stable reflectors, rendering phase change of 10 ° to be assured (1mm accuracy).
PSInSAR displacement measurement: R2=0.9999 achieved.
GB-SAR can be used for various applications such as:Safety monitoring of natural or anthropogenic structuresMicrowave backscattering properties of targetNew SAR system concept design
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System Configuration
T X R X O U TINM o t io nC o n t ro l
GP IB
T x V - p o lT x H - p o l
R x H - p o lR x V - p o l
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GB-SAR System(KIGAM-KNU)
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ArcSAR Concept
AWSAWS
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GB-SAR vs ArcSAR
GB-SAR ArcSAR(World first)
Scan Type Linear Arc
Scan Load Heavy Light
RF stability Stable Stable
Resolution HighHigher due to wider azimuth bandwidth
Installation Ground-fixedAutomobile: higher mobility
Phase repeatability High Low (Still now)
SAR focusing Conventional New
Major applicationDInSAR change detection
Emergency Mapping(Still now)DInSAR change detection (future)
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ArcSAR Hardware configuration
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VNA(Vector Network Analyzer)
Stepped frequencyBoth of Tx and RxFlexibility10 MHz – 20 GHz
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Antenna(C-band)
H-Pol radiation pattern
Dual-
Polarimetric
Square Horn
Antenna
Frequency(GHz) 5.0~5.6 5.0~5.6
Beam WidthE-Plane(deg) 15(nominal) 12.1~13
H-Plane(deg) 15(nominal) 15.5~17.5
Gain(dBi) 20(nominal) 20.5 min.(20.5~21.8)
VSWR 1.5 max. 1.4 max.
Isolation 35dB 이하 50dB 이하
Weight(kg) 4 max. 3.1 max.
Input Impedance(Ω) 50 50
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Antenna(X-band)
항목 시험결과
Frequency [GHz] 9.65 ± 0.5
Return loss [dB] -14.3 max
Isolation [dB] -40 max
Gain [dBi] 21.7 min
Connector Type N female
Input Impedance [Ω] 50
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Amp
Operating Freq.: 2~6 GHzPower Gain: 34 dB Maximum input: 6 dBm
Operating Freq.: 8~10.5 GHzOutput Power: 6 W
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Controller (PXI) and RF switch
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Acquisition software
Start
Initialize all system
Move to start position
Acquisition Call cal:VV:Switching:Call cal:VH:Switching:Call cal:HV:Switching:Call cal:HH:Switching
End
Move or Stop
Callibration
Save data
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Design of a arc-rail
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ArcSAR Standard Mode: 360˚ coverage with moderate resolution
ArcnIntegratioCoherent:
,Wavelength:
where
2:ResolutionAngular
s
s
L
λ
L
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ArcSAR Spot Mode: Limited coverage with higher resolution
ArcnIntegratioCoherent:
,Wavelength:
where
2:ResolutionAngular
s
s
L
λ
L
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Arc rail system
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Arc rail lift
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향후 추진계획
• 현장 테스트 (GB-SAR 와 비교실험 )• 위치보정 알고리듬 개발• 모니터링 테스트