gb-sar 시스템의 개발과 응용
DESCRIPTION
대한원격탐사학회 2007 춘계학술대회 3 월 30 일 대전 대덕컨벤션타운. GB-SAR 시스템의 개발과 응용. 이훈열 , 조성준 , 성낙훈 강원대학교 지구물리학과 한국지질자원연구원 지반안전연구부. Contents. Introduction GB-SAR System SAR Focusing and Interferometry Applications Conclusion. Introduction. GB-SAR: Ground-Based Synthetic Aperture Radar - PowerPoint PPT PresentationTRANSCRIPT
GB-SAR GB-SAR 시스템의 개발과 응용시스템의 개발과 응용
이훈열이훈열 , , 조성준조성준 , , 성낙훈성낙훈강원대학교 지구물리학과강원대학교 지구물리학과
한국지질자원연구원 지반안전연구부한국지질자원연구원 지반안전연구부
대한원격탐사학회 2007 춘계학술대회 3 월 30 일 대전 대덕컨벤션타운
ContentsContents
IntroductionIntroduction GB-SAR SystemGB-SAR System SAR Focusing and InterferometrySAR Focusing and Interferometry ApplicationsApplications ConclusionConclusion
IntroductionIntroduction GB-SAR: Ground-Based Synthetic Aperture RadarGB-SAR: Ground-Based Synthetic Aperture Radar
Synthetic Aperture RadarSynthetic Aperture Radar Imaging RadarImaging Radar Azimuth aperture synthesisAzimuth aperture synthesis
Ground-BasedGround-Based Fairly versatile system configurationFairly versatile system configuration
Multiple frequency (L, C, X, Ku, Ka, etc)Multiple frequency (L, C, X, Ku, Ka, etc) Full Polarization (VV, VH, HV, HH) Full Polarization (VV, VH, HV, HH)
Ultimate SAR focusingUltimate SAR focusing Zero Doppler centroid (stationary vehicle during Tx/Rx)Zero Doppler centroid (stationary vehicle during Tx/Rx) Accurate estimation of Doppler rate from geometry Accurate estimation of Doppler rate from geometry
Topography Mapping: Cross-Track InSAR or Delta-K InSARTopography Mapping: Cross-Track InSAR or Delta-K InSAR Surface Motion: Zero-baseline and short atmospheric path for Temporal Coherency, DInSAR and PSInSSurface Motion: Zero-baseline and short atmospheric path for Temporal Coherency, DInSAR and PSInS
ARAR Useful for new SAR concept designUseful for new SAR concept design
Previous WorksPrevious Works LISA (EU) for Avalanche and landslide monitoringLISA (EU) for Avalanche and landslide monitoring Other laboratory or field tests (UK, Japan)Other laboratory or field tests (UK, Japan)
System ConfigurationSystem 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
SAR Focusing AlgorithmsSAR Focusing Algorithms
AlgorithmsAlgorithms AdvantangeAdvantange DisadvantageDisadvantage UsageUsage
Range-DopplerRange-Doppler or or ωω -k-k
Widely used Widely used for SARfor SAR
Memory Memory inefficiency inefficiency for partial-for partial-focusingfocusing
Near Range Near Range
(full-focusing)(full-focusing)
Deramp-FFTDeramp-FFTEfficient in Efficient in
memory and memory and CPU timeCPU time
Distortion in Distortion in near rangenear range
Far RangeFar Range
(partial-(partial-focusing)focusing)
Time DomainTime Domain Exact Exact everywhereeverywhere
Time Time consumingconsuming EverywhereEverywhere
GB-SAR ResolutionsGB-SAR Resolutions
(a) Full Focusing (b) Partial Focusing X
Rx
2
2aLx
Range resolution: B
cR
2
GB-InSAR ConfigurationGB-InSAR Configuration
DInSARDInSAR Cross-Track Cross-Track
InSARInSAR Delta-K InSARDelta-K InSAR Cross-Track and Cross-Track and
Delta-K InSARDelta-K InSAR
DInSAR with range change
Cross-Track InSAR
GB-SAR InterferometryGB-SAR Interferometry
ChangeChange Phase DifferencePhase Difference Range phase Range phase rampramp SensitivitySensitivity
DInSARDInSAR Range Range nonenone RangeRange
Cross-Cross-Track Track InSARInSAR
Vertical baseline Vertical baseline HeightHeight
Delta-K Delta-K InSARInSAR Frequency shift Frequency shift HeightHeight
Cross-Cross-Track Track and and Delta-K Delta-K InSARInSAR
andand HeightHeight
KIGAM Roof-Top TestKIGAM Roof-Top Test
T1T1 Range:
Center frequency=5.3GHz Bandwidth=200MHzSample=1601Power=33dBm (2W)
Azimuth: Scan length=5mStep=5cmSample=101
T2T2: Temporal baseline of : Temporal baseline of 20minutes (DInSAR)20minutes (DInSAR)
T3T3: Spatial baseline of -30cm : Spatial baseline of -30cm vertical (InSAR DEM)vertical (InSAR DEM)
T4T4: Frequency shift of -10MHz : Frequency shift of -10MHz (Delta-K InSAR)(Delta-K InSAR)
Automatic AcquisitionAutomatic Acquisition with 2cm Step, 2007. 3. 19 7:22pm- 4:20am, A1~A9with 2cm Step, 2007. 3. 19 7:22pm- 4:20am, A1~A9
HHVV
Phase ErrorsPhase Errors
Ideal CaseA6-A5, HH
Azimuth scan shift of 2cm. A9-A1, HH
Range System Shift of 2mm
ConclusionConclusion We made a SAR system.We made a SAR system. A GB-SAR system was developed, tested, and waiting for applications.A GB-SAR system was developed, tested, and waiting for applications. Optimal GB-SAR focusing algorithms were tested.Optimal GB-SAR focusing algorithms were tested. Cross-Track and Delta-K InSAR were tested.Cross-Track and Delta-K InSAR were tested. DInSAR or PSInSAR were tested: Phase stability of 1DInSAR or PSInSAR were tested: Phase stability of 1° (0.1mm range) was ac° (0.1mm range) was ac
hieved for several hours for stable reflectors, rendering phase change of 1hieved for several hours for stable reflectors, rendering phase change of 10 ° meaningful (1mm range accuracy for DInSAR).0 ° meaningful (1mm range accuracy for DInSAR).
GB-SAR can be used for various applications such as:GB-SAR can be used for various applications such as: Safety monitoring of natural or anthropogenic structuresSafety monitoring of natural or anthropogenic structures Microwave backscattering properties of targetMicrowave backscattering properties of target New SAR system concept designNew SAR system concept design
More robust GB-SAR system optimized to a specific application will be develMore robust GB-SAR system optimized to a specific application will be developed. oped.