Modifying Range-Doppler geometry frameworks to process Spotlight SAR imagery in Polar Format
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arXiv
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866910869408972800 |
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| author | Agram, Piyush S. |
| author_facet | Agram, Piyush S. |
| contents | We present a simple method to enable processing of Spotlight Synthetic Aperture Radar (SAR) imagery distributed in Polar Format (PFA) using standard Range-Doppler (RDA) geometry algorithms. Our approach is applicable to PFA SAR images characterized by a constant value of the Center of Aperture (COA) time. We present simplified expressions for forward (image-to-ground) and inverse (ground-to-image) geometry mapping using Sensor Independent Complex Data (SICD) conventions. We discuss simple changes needed to current open source SAR software that implement Range-Doppler algorithms, to enable support within them for Spotlight data distributed in SICD format. We include a proof-of-concept script that utilizes the Python packages sarpy and isce3 to demonstrate the correctness of the proposed approach. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_07889 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Modifying Range-Doppler geometry frameworks to process Spotlight SAR imagery in Polar Format Agram, Piyush S. Image and Video Processing Geophysics We present a simple method to enable processing of Spotlight Synthetic Aperture Radar (SAR) imagery distributed in Polar Format (PFA) using standard Range-Doppler (RDA) geometry algorithms. Our approach is applicable to PFA SAR images characterized by a constant value of the Center of Aperture (COA) time. We present simplified expressions for forward (image-to-ground) and inverse (ground-to-image) geometry mapping using Sensor Independent Complex Data (SICD) conventions. We discuss simple changes needed to current open source SAR software that implement Range-Doppler algorithms, to enable support within them for Spotlight data distributed in SICD format. We include a proof-of-concept script that utilizes the Python packages sarpy and isce3 to demonstrate the correctness of the proposed approach. |
| title | Modifying Range-Doppler geometry frameworks to process Spotlight SAR imagery in Polar Format |
| topic | Image and Video Processing Geophysics |
| url | https://arxiv.org/abs/2503.07889 |