A ViSAR Imaging Method for Terahertz Band Using Chirp Z-Transform
Video synthetic aperture radar (ViSAR) as a new imaging mode has received more attention in recent years. In this mode, ViSAR system needs to persistently form a sequence of images while collecting data. For ViSAR, the frame rate needs to exceed 5 Hz to track maneuvering ground targets. Therefore, ViSAR system generally works in terahertz band. To avoid the 2-D interpolation of the polar format algorithm (PFA), a ViSAR imaging method is proposed in this paper. Based on the small synthetic angle characteristic of THz ViSAR, this method decomposes 2-D interpolation into range and azimuth interpolation, which is implemented by chirp Z-transform (CZT). The effectiveness of this method is validated by the simulation results in 0.3 THz.
KeywordsViSAR CZT PFA Terahertz
This work was supported by the 2011 Project for Collaborative Innovation Center of Information Sensing and Understanding.
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