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Research of time domain algorithm for UWB radar ISAR imaging

Compared with frequency domain algorithms of radar imaging, time domain algorithms have easier motion compensation, higher resolution and no noise from FFT. In this paper, we show a time domain ISAR imaging algorithm for ultra-wide bandwidth radar that all signal processing is performed in time domain. The backscattering waveform from metal plate is taken as the system function of the antenna-target system and used to restore the theoretical target signal by solving an ill problem with singular value decomposition (SVD) method, and to reconstruct the ISAR image with Back-Projection method. Experiments based on 30 ps pulse UWB radar show that the image quality from time domain algorithm is similar to, or better than from frequency domain algorithm.