The Advanced Land Observing Satellite-4 (ALOS-4) is the following mission of the Advanced Land Observing Satellite-2(ALOS-2). ALOS-4 carries two instruments, one is Phased Array-type L-band Synthetic Aperture Radar-3 (PALSAR-3) and the other is SPace based AIS for ships Experiment (SPAISE3). PALSAR-3 is the successor of PALSAR-2 aboard ALOS-2 and SPAISE3 is the successor of SPAISE2 aboard ALOS-2. Proto Flight Tests (PFT) for the ALOS-4 satellite system and the total end-to-end test including the ALOS-4 satellite system and ground segments were already completed. The operation preparations including operation training, calibration/validation preparation and coordination with users are on-going.
This paper describes the current status of PALSAR-3, L-band Synthetic Aperture Radar (SAR) boarded on Advanced Land Observing Satellite-4 (ALOS-4). ALOS-4 is the following mission of the ALOS-2 and the fourth generation of Japanese L-band SAR missions. PALSAR-3 has three observation modes same as PALSAR-2 boarded on ALOS-2. The same orbit and observation geometry as PALSAR-2 are selected to enable interferometric SAR (INSAR) time series analysis over 10 years using both of PALSAR-2 and PALSAR-3 data. PALSAR-3 will have the Basic Observation Scenario (BOS), same as PALSAR-2.
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.
This paper describes the current status of Advanced Land Observing Satellite-4 (ALOS-4) which will carry L-band SAR system, namely Phased Array-type L-band Synthetic Aperture Radar-3 (PALSAR-3) and SPace based Automatic Identification System for ships Experiment (SPAISE3). In particular, its mission objectives, characteristics and PALSAR-3 draft observation plan.
This paper describes the current status of Advanced Land Observing Satellite-4 (ALOS-4) which will carry L-band SAR system, namely Phased Array-type L-band Synthetic Aperture Radar-3 (PALSAR-3) and SPace based Automatic Identification System for ships Experiment (SPAISE3). In particular, its mission and characteristics of both instruments; PALSAR-3 and SPAISE3 are shown.
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