摘要
描述了相位梯度自聚焦 (PGA)算法的实现步骤 .基于对PGA算法的性能分析及对PGA算法的基本步骤所起作用的研究 ,提出了两种改进的方法 .首先 ,通过对加窗方法的改进 ,提高了算法的聚焦速度 ;另外 ,通过选择适当的距离行进行处理 。
The realization of phase gradient autofocus algorithm was described. Based on the analysis of the shortcoming of this algorithm and the study of the roles of the basic steps of this algorithm, proposed to improve the performance of the PGA algorithm. A way to select window width was developed, which can accelerate the convergence of the autofocus; and a way to select the appropriate distance row was also developed so that the effect of convergence of focus is good even under the condition of low SNR (signal-to-noise ratio).
出处
《北京航空航天大学学报》
EI
CAS
CSCD
北大核心
2004年第2期131-134,共4页
Journal of Beijing University of Aeronautics and Astronautics
基金
国防预研基金资助项目 (0 0J0 0 .1.1.HK0 14 3 )
关键词
合成孔径雷达
相位误差
相位梯度自聚焦
Algorithms
Automation
Convergence of numerical methods
Focusing
Phase control
Signal to noise ratio
