摘要
主要分析了星载合成孔径雷达(SAR)多普勒参数的估计误差对成像质量的影响,提出了利用自聚焦同时估计多普勒质心和多普勒调频率的方法;该方法使得两个多普勒参数的估计在准均匀和非均匀场景下能同时具有较高的精度,而且使估计的运算量也大为减少;最后通过星载 SEASAT-A海洋卫星原始数据成像试验,证明了该方法的优越性。
This paper discusses the effects on spaceborne synthetic aperture radar(SAR) imaging quality resulting from errors in the Doppler parameters used in imaging processing,and proposes a new method called Autofocus estimation method to estimate Doppler centroid and Doppler frequency rate with the cross-correlations of the first-look and the fourth-look subimag- ings in range and azimuth respectively.By using the spaceborne SEASAT-A raw data,it is clear- ly verified that the above mentioned new method is able to give high estimation accuracy of both Doppler parameters for a quasi-homogeneous or a non-homogeneous scene and is also able to de- crease a great deal of computation of Doppler parameters estimation.
出处
《电子科技大学学报》
EI
CAS
CSCD
北大核心
1993年第5期459-463,共5页
Journal of University of Electronic Science and Technology of China
关键词
星载
合成孔径雷达
多普勒
自聚焦
spaceborne
synthetic aperture radar
Doppler centroid
Doppler frequency rate
autofocus
imaging quality
