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Fast Fixed-Point Simulation Technology for SAR Real-Time Imaging System

LI Bing-yi;XIE Yi-zhuang;DU Qing;CHEN He;YANG Chen;School of Information and Electronics,Beijing Institute of Technology;  
Fixed-point processing optimization can reduce the storage,improve the computing speed,is an effective way to reduce power consumption and storage,improve the real-time performance of synthetic aperture radar(SAR)real-time imaging system.Taking the well-known chirp scaling(CS)algorithm as example,the count of computations was analyzed in this paper.Radix-22 algorithm of fast Fourier transform(FFT)as the main part of computations was adopted for fixed-point processing optimization,realized through a reasonable scale strategy with SystemC.Thus rapid system-level simulation of CS algorithm was implemented to provide a standard basis for FPGA implementation.Finally,test images from the raw lattice and area target data(16 384×16 384)were analyzed using fixed-point CS algorithm with 24 bits input word lengths.The simulation results meet the requirements of system indicators.
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