Design Discrete Frequency Coding Waveform Based OFDM for MIMO-SAR
Keywords:
MIMO-SAR, SAR applications, orthogonal waveform design, discrete frequency-coding waveform, OFDM, genetic algorithm.Abstract
Synthetic Aperture Radar (SAR) has been widely
used for a well-proven remote sensing technique for more than 30 years. However, single-antenna SAR systems cannot achieve wide-swath and high-resolution imaging at the same time. Multi-Input Multi-Output (MIMO) radar can be used to form a synthetic aperture for high resolution imaging. To successfully utilize the MIMO-SAR system for practical imaging application,
the orthogonal waveform design plays a critical role in image formation. In this paper, we modify the transmitted signal of the discrete frequency coding waveform with linear frequency modulation (DFCW-LFM) for MIMO-SAR from fixed chirp rate to variable chirp rate. Changing between the up –and down-chirp waveform can integrated between DFCW and Orthogonal Frequency Division Multiplexing (OFDM) to
improve integrated side-lobe level ratio (ISLR) and peak
side-lobe level ratio (PSLR) for MIMO-SAR. Modified genetic algorithm (GA) is proposed to numerically optimize the DFCW based OFDM. Some of the designed results are presented.
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