高分三号卫星总体设计验证

摘要

高分三号(GF-3)卫星是我国民用"高分辨率对地观测系统重大专项"中唯一一颗微波成像卫星,也是我国第1颗1 m分辨率C频段多极化合成孔径雷达(SAR)卫星,其定量化指标要求高,同时具有雷达天线质量、尺寸大,热控要求高,脉冲功率大,构型布局复杂等技术特点和难点.文章围绕GF-3卫星技术难点,系统阐述了卫星高定量化、高扩展性等总体设计特点及设计验证方法,并采用系统建模、模拟分析、地面试验和在轨测试等多种措施,确保卫星优良的图像质量和定量化应用能力,使其具备一定的在轨扩展能力.GF-3卫星设计和研制过程中采用的验证方法,可为后续SAR卫星的总体设计提供参考.%GF-3 satellite is the only microwave imaging satellite of the NHREOS (national high resolution earth observation system), as well as the first C-band multipolarity SAR (synthetic aperture radar)satellite with 1 m spatial revolution in China.The satellite has the requirement of high quantitative application index,as well as some technical characteristics and difficulties such as large mass and size of radar antenna, high requirement of thermal control,high power and complex structure at the same time.So in the paper,the system design characteristics and design verification methods are introduced such as high image quantification and high scalability. The high image quality and quantification application are achieved by using system modeling, simulation analysis, ground test and on-orbit test, which makes the satellite have on-orbit expansion ability.The verification methods adopted in design and development process of GF-3 satellite can be used to system design of other SAR satellites.