In this study, the more accurate spatial resolution for the low frequency (LF) UWB SAR is analyzed considering the wavenumber coupling. First, the SAR imaging geometry is provided, and then the spatial wavenumber of the LF UWB SAR echo data is analyzed. Second, the spatial resolution of the LF UWB SAR is derived based on the spatial wavenumber domain support. Besides, the squint angle is also considered in the spatial resolution derivation. Finally, simulation results are given to prove the validity.
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