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Development of F ocusing Algorithms for Arc-scanning Ground-Based Synthetic Aperture Radar

ISRS2009, Haeundae Grand Hotel, Busan, Korea, 28-30 October, 2009. Development of F ocusing Algorithms for Arc-scanning Ground-Based Synthetic Aperture Radar. Hoonyol Lee Dept. of Geophysics, Kangwon National University Seong-Jun Cho and Kwang-Eun Kim

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Development of F ocusing Algorithms for Arc-scanning Ground-Based Synthetic Aperture Radar

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  1. ISRS2009, Haeundae Grand Hotel, Busan, Korea, 28-30 October, 2009 Development of Focusing Algorithms for Arc-scanning Ground-Based Synthetic Aperture Radar Hoonyol Lee Dept. of Geophysics, Kangwon National University Seong-Jun Cho and Kwang-Eun Kim Korea Institute of Geosciences and Mineral Resources

  2. Contents • Introduction to ArcSAR • Focusing Algorithms for ArcSAR Spot and Scan Modes • Comparison of Resolutions • ArcSAR Spot Mode, ArcSAR Scan Mode, Linear-scanning GBSAR, and a conventional radar (ArcRAR) • Results • Conclusions

  3. Introduction to ArcSAR

  4. 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 structures • Microwave backscattering properties of target • New SAR system concept design

  5. ArcSAR Concept AWS AWS

  6. ArcSAR RF Configuration

  7. ArcSAR Design

  8. Circular Rail and Extendable Boom

  9. ArcSAR Truck

  10. ArcSAR Leveler

  11. ArcSAR Leveler

  12. ArcSAR Data Acquisition

  13. GB-SAR vs ArcSAR

  14. ArcSAR Focusing Algorithms

  15. ArcSAR Geometry • Polar Imaging Domain: • Range and • “True” azimuth

  16. Spot Mode Dual rotational motion (boom and antenna) Coherent Integration Arc can be 180 degree maximum. High resolution Limited azimuth coverage Scan Mode Single rotational motion (boom only) Coherent Integration Arc is the width of the antenna beam. Low resolution Full azimuth coverage ArcSAR Imaging Modes

  17. Spot Mode Deramp-FFT Algorithm in Polar Format Range Compressed Signal: Coherent Integration Arc: Range Function: Scan Mode Range-Doppler Algorithm in Polar Format Range Compressed signal: Coherent Integration Arc: Range Function: ArcSAR Focusing

  18. Spot Mode Taylor’s Expansion at : Deramp Function: Azimuth Compression: IFFT Scan Mode Taylor’s Expansion at : Matched Filter: Azimuth Compression: Matched Filtering ArcSAR Focusing

  19. Spot Mode Focused Image: Azimuth (angular) Resolution: Phase: Scan Mode Focused Image: Azimuth (angular) Resolution: Phase: ArcSAR Focusing

  20. Flowchart Raw Data Range Hamming Filter Range Compression Azimuth FFT Range Migration Range Migration Multiply Deramp function Azimuth Matched Filter Azimuth Hamming Filter Azimuth Hamming Filter Azimuth FFT Azimuth iFFT Geometric Correction Geometric Correction Output Output Deramp-FFT Range-Doppler

  21. Azimuth Resolutions

  22. Results

  23. Simulation: ArcSAR Spot Mode

  24. Simulation: ArcSAR Scan Mode

  25. ArcSAR Scan Mode Experiment

  26. Further Research • A brand-new truck has arrived and is under reform. • Second motor control for ArcSAR Spot Mode will be added. • Integrated Controller • SAR, InSAR, Surface motion detector software • GPS, AWS • Increase Mileage!

  27. Conclusions • Image focusing algorithms for ArcSAR were developed in polar coordinates. • The Deramp-FFT algorithm was used for ArcSAR Spot Mode and the Range-Doppler algorithm for ArcSAR Scan Mode. • Comparisons of image resolutions between various ground-based radar systems confirmed the advantages of ArcSAR: ArcSAR Spot Mode > Linear-scanning GBSAR > ArcSAR Spot Mode > ArcRAR 167.2 53.4 11.0 1 • The system will be mounted on a “new” truck and will provide a rapid response tool for various applications such as regional mapping and environmental hazard monitoring.

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