Spectrum reconstruction with nonuniform fast Fourier transform for MIMO SAR azimuth nonuniform sampling

Abstract

Multiple input multiple output (MIMO) synthetic aperture radar (SAR) shows much potential compared with traditional SAR in many interesting applications. In MIMO SAR high resolution wide swath imaging, azimuth ambiguity is a problem when the system azimuth sampling is nonuniform. A spectrum reconstruction method based on periodic nonuniform sampling theory has been used for azimuth ambiguity suppression. However, the computation cost is very high for MIMO SAR with a lot of transmitters/receivers. In this paper, MIMO SAR spectrum reconstruction with nonuniform fast Fourier transform (NUFFT) is proposed. The simulation results show the effectivity of the proposed spectrum reconstruction method.