Title: ISAR Instantaneous Imaging Algorithm Based on Time-freuqency Analysis
Abstract: The traditional range Doppler algorithm is suitable only to the stationary target.When the target moves irregularly,the Doppler frequency of each scatterer and the imaging projection plane of a maneuvering target may change with time,which makes scattering points wider and ISAR image blurry. This paper compares Fourier transform with time-frequency analysis. Then,it analyzes time-frequency concentration and cross-term interference of several typical time-frequency distributions. We find that reassigned Gabor spectrum time-frequency distribution is better for time-frequency concentration and cross-term suppression,and can obtain good instantaneous images of targets. Finally,the simulated data and real data demonstrate the validity of the method proposed.
Publication Year: 2009
Publication Date: 2009-01-01
Language: en
Type: article
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