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Implementation of RISAT-1 Hybrid Polarimetric Decomposition Techniques and Analysis Using Corner Reflector Data

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Abstract

With recent advances in polarimetry, Synthetic Aperture Radar (SAR) with Hybrid–polarity architecture, a demonstration of compact polarimetry enabled larger swath coverage, reduced PRF and SAR system complexity as compared to fully polarimetric systems. The first Hybrid Polarimetric Space-borne SAR in Earth Observation orbit, India’s Radar Imaging Satellite (RISAT-1) is a new-fangled gateway to remote sensing user community for land and oceanic applications. In response to a right-circular polarized transmitted signal, based on the derived stokes vectors, Stokes parameters are estimated to produce several useful quantitative measures for generating polarimetric decomposed image. m-delta, m-chi and m-alpha polarimetric decomposition methods along with suitable weighting functions in terms of three principal components are implemented which maps Stokes parameters to RGB image space for representing odd bounce, even bounce and volume scattering targets. Various RISAT-1 Hybrid Fine Resolution Stripmap Single-Look Complex SAR datasets acquired over deployed corner reflectors at calibration site, Shadnagar have been considered over which different hybrid polarimetric decomposition techniques are implemented using in-house developed software. Further analysis produced encouraging results with standard point targets like dihedral and trihedral corner reflectors against distributed targets in the same scene to demonstrate the scattering mechanisms as per their characteristics when interacted with a polarized signal were presented in this paper.

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Acknowledgements

Authors are highly grateful to Dr. Y.V.N. Krishna Murthy, Director, NRSC and Shri. B. Gopala Krishna DD, DPPA &WAA/NRSC for providing necessary facilities to carry out the research work. We are thankful to Sri V. Ramanujam and Sri Dharmendra Kumar Pandey, SAC/ISRO and FDG, ISAC, NDC and Mechanical Facility, NRSC for their technical support, acquisition plan and deployment of corner reflectors.

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Authors and Affiliations

  1. Microwave Remote Sensing and Global Data Processing Group, National Remote Sensing Centre, Indian Space Research Organization, Balanagar, Hyderabad, 500 037, India

    P. V. Jayasri, K. Niharika, Manoj Joseph, H. S. V. Usha Sundari Ryali, C. V. Ramana Sarma, E. V. S. Sita Kumari & A. V. V. Prasad

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  1. P. V. Jayasri
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  2. K. Niharika
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  3. Manoj Joseph
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  4. H. S. V. Usha Sundari Ryali
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  5. C. V. Ramana Sarma
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  6. E. V. S. Sita Kumari
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  7. A. V. V. Prasad
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Correspondence to P. V. Jayasri.

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Jayasri, P.V., Niharika, K., Joseph, M. et al. Implementation of RISAT-1 Hybrid Polarimetric Decomposition Techniques and Analysis Using Corner Reflector Data. J Indian Soc Remote Sens 46, 1005–1012 (2018). https://doi.org/10.1007/s12524-018-0758-2

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  • DOI: https://doi.org/10.1007/s12524-018-0758-2

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