Image quality characterization of fine resolution RISAT-1 data using impulse response function |
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| Authors: | Gautam Dadhich Shweta Sharma Mihir Rambhia Aloke K. Mathur P. R. Patel Alpana Shukla |
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| Affiliation: | 1. Civil Engineering Department, Nirma University, Ahmedabad, India;2. Calibration and Validation Division, Space Applications Centre, ISRO, Ahmedabad, India;3. Department of Civil, Geo and Environmental Engineering, TUM, Munich, Germany;4. Botany Department, M.G. Science Institute, Ahmedabad, India |
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| Abstract: | This study presents the results obtained from image quality assessment of Radar Imaging SATellite (RISAT-1). Image quality parameters such as spatial resolution, peak to sidelobe ratio (PSLR) and integrated sidelobe ratio (ISLR) are calculated by the analysis of impulse response function (IRF) of the point target. The study is carried out to assess temporal stability and consistency of image quality parameters obtained from analysis of IRF of 44 point targets. The results obtained from this study show that the mean values of the range and azimuth resolution are 2.048 ± 0.081 m and 3.383 ± 0.097 m for RH and 1.981 ± 0.081 m and 3.348 ± 0.076 m for RV, respectively. PSLR/ISLR values for RH channel are obtained as ?26.492 dB/?26.823 dB for azimuth and ?19.209 dB/?19.921 dB for the range. For RV channel, PSLR/ISLR values are ?26.300 dB/?27.572 dB for azimuth and ?19.146 dB/?19.827 dB for range. |
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| Keywords: | SAR PSLR ISLR RISAT-1 image quality corner reflector impulse response function |
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