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GB-SAR 시스템의 영상화 및 간섭기법

한국지구물리물리탐사학회 2007 학술대회 6 월 7-8 일 한국지질자원연구원. GB-SAR 시스템의 영상화 및 간섭기법. 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

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GB-SAR 시스템의 영상화 및 간섭기법

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  1. 한국지구물리물리탐사학회 2007 학술대회 6월 7-8일 한국지질자원연구원 GB-SAR 시스템의 영상화 및 간섭기법 이훈열, 조성준, 성낙훈 강원대학교 지구물리학과 한국지질자원연구원 지반안전연구부

  2. Contents • Introduction • GB-SAR System • SAR Focusing and Interferometry • Applications • Conclusion

  3. Introduction • GB-SAR: Ground-Based Synthetic Aperture Radar • Synthetic Aperture Radar • Imaging Radar • Azimuth aperture synthesis • Ground-Based • Fairly versatile system configuration • Multiple frequency (L, C, X, Ku, Ka, etc) • Full Polarization (VV, VH, HV, HH) • Ultimate SAR focusing • Zero Doppler centroid (stationary vehicle during Tx/Rx) • Accurate estimation of Doppler rate from geometry • Topography Mapping: Cross-Track InSAR or Delta-K InSAR • Surface Motion: Zero-baseline and short atmospheric path for Temporal Coherency, DInSAR and PSInSAR • Useful for new SAR concept design • Previous Works • LISA (EU) for Avalanche and landslide monitoring • Other laboratory or field tests (UK, Japan)

  4. GB-SAR System

  5. System Configuration

  6. SAR Focusing Algorithms

  7. DF vs RD (Indoor) (b) RD algorithm (a) DF algorithm

  8. DF vs RD (outdoor) (a) DF algorithm (2MB Memory) (b) DF algorithm (geocoded) (b) RD algorithm (128MB Memory)

  9. GB-SAR Resolutions Range resolution: (a) Full Focusing (b) Partial Focusing

  10. GB-InSAR Configuration • DInSAR • Cross-Track InSAR • Delta-K InSAR • Cross-Track and Delta-K InSAR DInSAR with range change Cross-Track InSAR

  11. GB-SAR Interferometry

  12. KIGAM Roof-Top Test • T1 Range: Center frequency=5.3GHz Bandwidth=200MHz Sample=1601 Power=33dBm (2W) Azimuth: Scan length=5m Step=5cm Sample=101 • T2: Temporal baseline of 20minutes (DInSAR) • T3: Spatial baseline of -30cm vertical (InSAR DEM) • T4: Frequency shift of -10MHz (Delta-K InSAR)

  13. Image Area

  14. VV T1

  15. VH T1

  16. HH T1

  17. DInSAR (T2-T1) VV

  18. Cross-Track InSAR (T3-T2) VV

  19. Delta-K InSAR (T4-T3) VV VV

  20. Cross-Track and Delta-K InSAR (T4-T2) VV VV VV

  21. Automatic Acquisitionwith 2cm Step, 2007. 3. 19 7:22pm- 4:20am, A1~A9 VV HH

  22. Phase Errors Ideal Case A6-A5, HH Azimuth scan shift of 2cm. A9-A1, HH Range System Shift of 2mm

  23. PSInSAR – Temporal Coherence TC of 9 acquisitions for 2 hours. Color scheme: black(0) to white(0.9) and blue (0.9) to red(1)

  24. Conclusion • We made a SAR system. • A GB-SAR system was developed, tested, and waiting for applications. • Optimal GB-SAR focusing algorithms were tested. • Cross-Track and Delta-K InSAR were tested. • DInSAR or PSInSAR were tested: Phase stability of 1° (0.1mm range) was achieved for several hours for stable reflectors, rendering phase change of 10 ° meaningful (1mm range accuracy for DInSAR). • GB-SAR can be used for various applications such as: • Safety monitoring of natural or anthropogenic structures • Microwave backscattering properties of target • New SAR system concept design • More robust GB-SAR system optimized to a specific application will be developed.

  25. Thank You

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