Influences of channel errors and interference on the OFDM-MIMO SAR

The orthogonal frequency division multiplexing (OFDM) MIMO SAR is the combination of sub-aperture technique and sub-band technique to achieve high azimuth resolution, high range resolution, and wide swath simultaneously. However, the interference of the sub-bands and the channel errors (channel mismatches), like constant phase error, amplitude error, and sampling delay error of the fast time, have great influence on the imaging results. This paper concentrates on the pulse response after bandwidth synthesis with the consideration of the interference within two adjacent sub-bands and these channel errors respectively. The theoretical derivation and simulation experiments are given.