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This paper describes the current status of Advanced Land Observing Satellite-4 (ALOS-4) and its two instruments: Phased Array-type L-band Synthetic Aperture Radar-3 (PALSAR-3) and SPace based Automatic Identification System for ships Experiment (SPAISE3). PALSAR-3 is the successor of PALSAR-2 which is boarded on ALOS-2(Advanced Land Observing Satellite-2) and has 3m resolution and 200km observation swath by using Digital Beam Forming (DBF) technology. Its antenna consists of 5 panels and is about 20% larger than PALSAR-2, to get the same NESZ (Noise Equivalent Sigma Zero) performance for a wide observation swath. PALSAR-3 will be in the same orbit and observation geometry as PALSAR-2 to enable InSAR time series analysis over 10 years using both of PALSAR-2 and PALSAR-3 data. PALSAR-3 has several observation modes with different spatial resolutions to fulfill the mission requirements. In order to achieve temporally and spatially consistent data, systematic observation, a Basic Observation Scenario (BOS) will be defined. SPAISE3 is a high-performance satellite AIS receiver and the successor of SPAISE2 boarded on ALOS2. SPAISE3 has eight antennas and adopts ground-based DBF method as one of effective countermeasures against radio wave interference regions. Using this technology, the detection success rate of ships in heavy marine traffic area will be improved compared to SPAISE2.
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