摘要
该文分析了方位一维图像的全变差范数随二次相位误差的变化情况,得到全变差范数是二次相位误差的单峰函数的结论,且在二次相位误差等于零时全变差范数最小。从而利用全变差范数作为性能函数,采用黄金分割最优化算法,通过循环迭代得到自聚焦的SAR图像。实验结果表明此算法在处理二次相位误差时优于相位梯度自聚焦算法。通过算法复杂度的分析表明该算法的计算量约为相位梯度自聚焦的二分之一。
Minimum Total Variation Autofocus (MTVA) algorithm for SAR imaging is studied. Firstly, the relationship between total variation of SAR image and 2nd-order phase error is analyzed. The results show that total variation is a single peak function of 2nd-order phase error. Total variation reaches minimum when zero phase error. Then total variation norm is used as performance function. Golden selection method is adopted to get focused SAR image. Finally, experimental results show that MTVA algorithm has good performance and is better than Phase Gradient Autofocus (PGA) algorithm. Study of complexity shows that MTVA's computation amount is nearly half of PGA's.
出处
《电子与信息学报》
EI
CSCD
北大核心
2007年第1期12-14,共3页
Journal of Electronics & Information Technology
关键词
合成孔径雷达
相位误差
自聚焦
全变差
Synthetic Aperture Radar (SAR)
Phase error, Autofocus
Total Variation
作者简介
甘荣兵:男,1975年生,博士生,研究方向为雷达信号处理.
王建国:男,1954年生。教授,从事合成孔径雷达成像、雷达目标识别、合成孔径雷达对抗技术等.