摘要
地球同步轨道SAR具备着低轨SAR所不具有的优势,然而其具有合成孔径时间长、慢速运动的特点,成像处理远比低轨SAR复杂。针对地球同步轨道"8"字形星下点轨迹的特点,结合现有的成像算法,对GEOSAR回波信号进行了建模,对成像算法的选择做了说明,主要分析了BP算法、RD算法、CS算法。最后在对三种算法分别仿真的基础上详细地比较了算法在地球同步轨道上的适应性、成像效果以及计算量。
Compared with low orbit SAR,geosynchronous orbit SAR has unique superiority.However,GEOSAR is far more complex at imaging because of its long synthetic aperture time and slow velocity.Aimed at ＂8＂ shape of sub-satellite point,combined with convention imaging algorithms,the GEOSAR is modeled.The selection of algorithms is showed,and the BP algorithm,RD algorithm and CS algorithm are analyzed.At last,based on simulation for the three algorithms,the flexibility,imaging effect and computation burns of algorithms at GEOSAR are compared.
出处
《航天电子对抗》
2010年第2期23-26,共4页
Aerospace Electronic Warfare
关键词
地球同步轨道
SAR
算法比较
geosynchronous orbit
SAR
comparison of algorithms
