Sentinel-1 Azimuth Subbanding for Multiple Aperture Interferometry - Test Case Over the Roi Baudouin Ice Shelf, East Antarctica

As an extension of Synthetic Aperture Radar Interferometry, Multiple Aperture Radar (MAI) is a spectral diversity technique that allows the determination of azimuth displacements from phase shift measurements. This is made possible through the creation of backward- and forward-looking Single-Look-Complex (SLC) data. Then, the phase difference between the backward and forward-looking interferogram is translated into a displacement. Using SLC data, MAI requires a proper azimuth splitband operator. Different techniques exist to split the azimuth band, but they are often too briefly described in the MAI literature. In this conference paper, we analyze the signal properties of the Sentinel-1 TOPS acquisition mode and define an azimuth subbanding protocol. In particular, we look at the role of de-apodization and apodization in the band filtering operation. We focus our analysis on Sentinel-1 data in Interferometric Wideswath mode over the Roi Baudouin Ice Shelf, East Antarctica.