Interferometry With ALOS ALOS-2 Full-Aperture Aperture ScanSAR Data
Abstract: Advanced Land Observing Satellite Satellite-2 (ALOS-2) 2) is designed to routinely acquire both scanning synthetic aperture radar (ScanSAR) and stripmap data. In this paper, we present a special multiband bandpass filter (MBF) to remove azimuth nonoverlap spectra for the interferometric processing of ALOS ALOS-2 2 full-aperture full ScanSAR product. As required by the MBF, we estimate the important ScanSAR system parameters ameters and the start times of raw bursts using ALOS ALOS-2 2 full-aperture full ScanSAR image. The resulting MBF can remove the nonoverlap spectra caused by both Doppler centroid frequency difference and burst misalignment. It can be used in ScanSAR-ScanSAR ScanSAR interfero interferometry, metry, as well as ScanSAR-stripmap ScanSAR interferometry. Based on the MBF, we propose a single processing workflow that is able to implement both ScanSAR ScanSAR-ScanSAR ScanSAR interferometry and ScanSARScanSAR stripmap interferometry. Finally, we present example interferograms of the th 2015 Gorkha earthquake in Nepal processed using the proposed processing workflow. The interferograms are greatly improved after applying the MBF to remove the significant amount of nonoverlap spectra in the data.