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SAR Techniques and SAR Processing Algorithm for ALOS-4

Phased-Array L-band Synthetic Aperture Radar-3 (PALSAR-3) onboard Advanced Land Observing Satellite-4 (ALOS-4) is a spaceborne L-band Synthetic Aperture Radar (SAR) system, capable of high resolution and wide swath observation. ALOS-4 utilizes digital beamforming (DBF) and multiple transmit channel (MTC) techniques to overcome swath width and azimuth resolution trade-off relationship. In addition, ALOS-4 signal data requires signal processing, such as azimuth multi-beamforming and sub-band phase correction, before conventional SAR image processing can be implemented. In this paper, newly developed signal pro-cessing algorithm for ALOS-4 and results of the validation of the algorithm using flight model data will be discussed.