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Extended NCS Based on Method of Series Reversion for Imaging of Highly Squinted SAR

Extended NCS Based on Method of Series Reversion for Imaging of Highly Squinted SAR,10.1109/LGRS.2010.2084562,IEEE Geoscience and Remote Sensing Lette

Extended NCS Based on Method of Series Reversion for Imaging of Highly Squinted SAR  
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In the case of high range resolution and squint an- gle, current chirp scaling algorithm (CSA) and nonlinear CSA (NCSA) have a finite ability to achieve high-quality images. The problem stems from a range-dependent (i.e., space-variant) cubic- and higher order terms of range frequency, which require suffi- cient compensation or space-variant filtering, in the phase of the synthetic aperture radar transfer function, and this letter aims at dealing with this problem. First, an inequation is introduced to evaluate the highest order of range frequency terms whose space-variant coefficient has to be taken into account. Then, based on the method of series reversion, this letter proposes the extended NCS which can weaken the range dependence of the considered range frequency terms and achieve accurate range cell migration correction and range compression. Simulation results are pre- sented to validate the proposed method. Index Terms—Extended nonlinear chirp scaling (ENCS), method of series reversion (MSR), range dependence.
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