Abstract
The squinted spotlight SAR(Synthetic Aperture Radar) is an effective imaging mode for obtaining high-resolution SAR imagery in advance. However, a large-range cell migration heavily burdens the storage equipment, and the SAR system should consider its high risk for blind range and Nadir interference. Recently, the PRF(Pulse Repetition Frequency) variation and ASRW(Adaptive Sliding Range Window) have been proposed as effective techniques for squinted SAR image acquisition. This paper presents a signal processing algorithm for the squinted variable PRF spotlight-SAR. The algorithm is a two-step focusing algorithm combined with the interpolation method for compensating distortions due to PRF variation. The simulated variable PRF SAR raw data and processing results demonstrate the validity of the proposed approach.
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