A synthetic aperture radar (SAR) raw signal simulation algorithm for extended scenes is presented. This algorithm is based on the SAR two|dimensional system transform function (STF). To cope with range|variant nature of SAR STF and increase the speed of this algorithm, new formulas for range|variant phase corrections in range|Doppler (RD) domain are developed. In this way, many azimuth lines can be simulated with the same SAR STF. It only needs two|dimensional fast Fourier transform code and complex multiplications. Comparing with time|domain simulation algorithm, it is very simple and thus efficient. Simulation results have shown that this algorithm is accurate and efficient.
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