Current development status of the wide-swath and high-resolution optical imager onboard Advanced Optical Satellite (ALOS-3)

摘要

JAXA has continued to develop the Advanced Optical Satellite (called "ALOS-3") since FY 2016, as a successor of the optical mission of the Advanced Land Observing Satellite (ALOS) "DAICHI" (2006-2011). The wide-swath and high-resolution optical imager (WISH) is a main sensor of ALOS-3. It has capabilities to collect high-resolution (0.8m Pan / 3.2m MS at nadir) and wide-swath (70 km) images with a high geo-location accuracy to meet the mission objectives of ALOS-3. WISH has a Pan band and 6 MS bands. The MS equips the basic four bands (R, G. B and NIR) and 2 additional bands of "coastal" and "RedEdge" expected to use for the various applications. The development of WISH is in the final stage of the critical design phase. We have finished the test of engineering model of the primary mirror assembly with no critical problem. In addition, the mechanical environmental tests using the structure model was completed, and the demonstration for high accuracy assembling of the large off-axis telescope is undergoing. For the detector system, the evaluation of the engineering model of the CCDs was completed in early phase, and assembly of the flight CCDs has been started in advance. In the current schedule, PFM manufacturing and subsequent proto-flight tests would be conducted within about a year and WISH would be delivered to the satellite system by the middle of FY 2019. ALOS-3 equipped with WISH would be launched by H-IIA rocket in FY 2020.