Transactions of Nanjing University of Aeronautics & Astronautics
High Resolution Sparse Imaging and Doppler Parameter Estimation of Fucheng-1 SAR Satellite
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Abstract:
In recent years， the development of domestic commercial synthetic aperture radar （SAR） is in full swing， with multiple commercial SAR satellites in orbit， showing great potential in disaster monitoring， natural resource management and deformation observation. Fucheng-1 is the first C-band commercial SAR satellite for interferometric SAR （InSAR） service developed by Spacety China， which marks the gradual maturity of China’s remote sensing data service. Based on the raw data collected by Fucheng-1， this paper firstly introduces the range-Doppler algorithm （RDA）， then illustrates the parameter estimation method on the basis of fractional Fourier transform （FrFT） to realize the accurate estimation of azimuth chirp rate， which effectively improves imaging quality. Finally， the L 1-norm regularization based sparse imaging method is utilized to reconstruct images from down-sampled data. Experimental results show that the sparse imaging algorithm can accurately reconstruct the down-sampled Fucheng-1 data and suppress sidelobes and clutter.
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Clc Number:
TN957.52
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