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GB-SAR 시스템의 개발과 응용

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

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GB-SAR 시스템의 개발과 응용

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  1. 대한원격탐사학회 2007 춘계학술대회 3월 30일 대전 대덕컨벤션타운 GB-SAR 시스템의 개발과 응용 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. GB-SAR Resolutions Range resolution: (a) Full Focusing (b) Partial Focusing

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

  9. GB-SAR Interferometry

  10. 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)

  11. Image Area

  12. VV T1

  13. VH T1

  14. HH T1

  15. DInSAR (T2-T1) VV

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

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

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

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

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

  21. 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.

  22. Thank You

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