摘要
针对机动目标提出一种新的自聚焦方法.该方法在平动相位误差估计过程中考虑对方位调频相位的优化估计;通过对多样本信号的相干积累,有效提高低信噪比下的估计性能;结合迭代处理可进一步提高相位误差估计的精度.仿真和实测数据处理结果表明,提出的方法具有比传统方法更好的自聚焦效果和对噪声的容忍性.
A new autofocus method for maneuvering targets is proposed . The chirp component of the signal can be obtained by means of exhaustive linear search . The random initial phase terms are evaluated precisely by accumulating all the coherent signals in the low SNR case , and the accuracy of estimating the phase error terms can be improved by iteration . Finally , simulation results measured data verify the validity of the proposed algorithm .
出处
《西安电子科技大学学报》
EI
CAS
CSCD
北大核心
2014年第3期71-78,共8页
Journal of Xidian University
基金
国家自然科学基金资助项目(61301280)
中央高校基本科研业务费资助项目(K5051302001
K5051302038)
关键词
机动目标
二次相位补偿
初始相位补偿
自聚焦
maneuvering targets
second-order phase terms compensation
random initial phase terms
autofocus
