摘要
在合成孔径雷达成像及其应用中,需要对调频斜率进行估计.常用的估计调频斜率的方法是图像对比度最优算法,但该算法需反复迭代,导致该算法计算量大、收敛速度慢、效率低.为此,提出了一种基于对比度最优准则的调频斜率估计方法——抛物线法.该方法是根据图像对比度与方位向调频斜率的关系,引入数学中的抛物线法来估计多普勒调频斜率,避免了传统算法中的反复迭代,大大提高了计算效率.最后,用机载SAR实测数据验证了该方法的可行性和高效性.
In synthetic aperture radar imaging and application, the frequency rate needs to be estimated. The usual algorithm based on image contrast optimization needs iteration,so the computation of the algorithm is big,the constringency of the algorithm is tardy and the algorithm is inefficient. For conquering the defect, a new autofocus algorithm based on image contrast optimization is showed in this paper. The algorithm is named parabola method. The algorithm estimates Doppler rate by using parabola in mathematics. Without iteration, the efficiency of the algorithm is greatly improved. The airborne synthetic aperture radar（SAR） real data image re- sult and analysis validate the feasibility and efficiency of given method in this paper.
出处
《电波科学学报》
EI
CSCD
北大核心
2013年第5期953-956,共4页
Chinese Journal of Radio Science
关键词
合成孔径雷达
图像对比度
抛物线法
调频斜率估计
synthetic aperture radar
image contrast
parabola method
frequency rate estimation
