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| Research of Polar Format Algorithm for Bistatic SAR Imaging Based on Chirp Scaling |
| Wang Xin; Zhu Daiy-in; Zhu Zhao-da |
| College of Information Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210026, China |
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Abstract This paper investigates an implementation of Polar Format Algorithm(PFA) in Bistatic SAR imaging based on the principle of Chirp Scaling(CS). PFA realizes data’s Polar Coordinate Transformation by two 1-D interpolations, which is computationally expensive. Based on the linear frequency modulation characteristic of emission signal, the paper uses Chirp Scaling methodology to process data in range dimension, which only includes signal multiplications and FFTs, thereby avoiding interpolation. The chirped and dechirped signals are discussed separately. Compared with interpolation, the results are equivalent, but the method of CS has increased speed significantly. The experimental simulation results with the point target validate the validity of this method.
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Received: 24 July 2008
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2009, Vol. 31 
