kigamkigam arcsar 시스템 설계 및 제작 2009. 3. 27. 대한원격탐사학회...

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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

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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