摘要
将频率Scaling算法(FSA)引入到聚束式星载合成孔径雷达(SAR)成像应用中,提出了直接对距离向线性调频信号进行频率Scaling操作来完成距离向聚焦的方法,并采用方位压缩的办法来解决方位向脉冲重复频率(PRF)过高的问题.点阵目标实验仿真结果证明了该算法的可行性和有效性.
The frequency scaling algorithm (FSA) was introduced in spaceborne spotlight SAR. As the range time extension of imaged scene is smaller than the width of transmitted pulse, FSA is applied in airborne spotlight SAR dechirps on received echoes and which can reduce the sampling rate to release the computational burden. In spaceborne SAR, however, the range extension is much larger and the bandwidth after dechirping increases instead so that the existing FSA can not be adopted. To overcome this problem, a method to perform directly frequency scaling on chirps in range direction was proposed. An azimuth compression was applied to reduce PRF in azimuth direction. Finally, simulation results of point targets were given to demonstrate the validity and efficiency of the proposed algorithm.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2004年第11期1777-1780,共4页
Journal of Shanghai Jiaotong University
基金
国家高技术研究发展计划(863)项目(2001AA132060)
关键词
合成孔径雷达
星载聚束式
成像算法
Algorithms
Doppler effect
Fast Fourier transforms
Radar imaging
