The Imaging of SAR Based on OFDM Waveforms Signal with the Compensation of Coding Term

The potential application of OFDM waveforms in SAR is considered in this paper, especially for the SAR imaging based on OFDM waveforms. The OFDM waveforms destroy the flat spectrum from the conventional Linear Frequency Modulation (LFM) waveform, which bring difficulties to high resolution imaging. This paper first analyzes the characteristics of OFDM waveforms in detail, derives its two-dimensional spectral, then proposes a novel algorithm for the high resolution imaging based on OFDM waveforms. This algorithm is based on the compensation of coding term. It manages Range Cell Migration Correction (RCMC), suppresses the sidelobe from coding, and improves the imaging performance greatly. The simulation results prove the validity of this algorithm.