Terrain Observation Using Ground-based Interferometric Millimeter-wave SAR Imaging

Synthetic aperture radar (SAR) has been widely applied to terrain observation as an enhanced sensor for all-weather and all-day functions. In this paper, a ground-based millimeter-wave multi-channel interferometric SAR (InSAR) system design and high-resolution imaging algorithm are proposed, which is characterized by small-size, low-cost, and high-precision. Firstly, the frequency-domain imaging algorithm of chirp-scaling is adopted to realize the range cell migration correction (RCMC) and two-dimensional focusing. Then, multi-channel interferometric processing is used to obtain the angle estimation of the imaging scene. Finally, experiments using measured data are performed to confirm the effectiveness of ground-based SAR imaging for terrain observation.