摘要
Abstract
Traditional satellite data are predominantly processed on the ground,requiring satellite data transmission to Earth,subsequent ground-based processing,and distribution of processed results to users.This approach involves multiple transmission and processing steps,adversely af-fecting response speed and making it challenging to meet user requirements for high time-sensi-tive information acquisition,such as disaster prevention and mitigation,environmental protec-tion,etc.This paper focuses on the design and realization of an on-orbit real-time processing sys-tem for 5m synthetic aperture radar(S-SAR)satellites.Through algorithmic and hardware ar-chitecture optimization,critical issues,such as the substantial volume of SAR raw echo data,multiple intermediate steps and prolonged processing durations associated with space-to-ground transmission and processing,were effectively addressed by developing an on-board emergency da-ta processor.This system enables real-time on-orbit processing of SAR raw data under stringent on-board resource constraints.By employing this system,the first domestic on-orbit generation of regional SAR secondary image products was achieved,effectively addressing the capability gap of in China's on-orbit production of SAR secondary image.Furthermore,it has water-body tar-get detection was implemented,generating water body extraction products with an on-orbit pro-cessing latency of under 25 seconds.Consequently,the system's responsiveness was substantially improved,reducing the delay for user access to satellite information from hours to mere minutes.This research not only provides technical support for major application demands such as disaster prevention and mitigation,environmental protection,but also serves as an essential reference for the innovation and development of future on-orbit real-time processing technologies in civil satel-lite missions.关键词
在轨实时处理/区域SAR二级产品生产/水域检测/时效性Key words
on-orbit real-time processing/regional SAR secondary product generation/water-body detection/timeliness分类
信息技术与安全科学
