面向高轨目标的强度相干成像方法改进研究  

Ameliorated Method of Intensity Correlation Imaging Towards High-Orbit Satellites

作　　者：高昕[1] 李希宇[1] 唐嘉[1] 陆长明[1] 

机构地区：[1]北京跟踪与通信技术研究所,北京100094

出　　处：《光学学报》2015年第6期73-79,共7页Acta Optica Sinica

基　　金：国家863高技术研究发展计划(2011AA8080110)

摘　　要：利用强度相干方法对高轨目标成像时存在着频谱模值测量信噪比低和相位恢复复杂等问题,严重影响成像质量。为获得高轨目标的清晰图像,根据高轨卫星空间频谱分布先验信息、图像分布先验信息和强度相干测量噪声分布特点,探讨了利用先验信息对强度相干成像的频谱模值估计方法和相位恢复方法进行改进与优化,并设计了室内实验验证了改进算法的有效性。室内实验表明,通过对频谱模值估计方法和相位恢复算法的改进能够显著提高强度相干成像质量,减小恢复结果中的噪声斑点与歧义图像。In the process of high-orbit target imaging with intensity correlation method, the low detecting signal to noise ratio and inaccurate phase retrieval algorithm seriously affect the imaging quality. To realize the high-orbit target imaging clearly, the amelioration and optimization of estimation method to spatial spectral modulus and phase retrieval is discussed according to the priori information of spatial spectral distribution of high-orbit satellite, priori information of satellite images and noise distribution characteristics of intensity correlation imaging method, indoor experiment is designed to verify the validation of algorithm. Laboratory experiments indicate that the imaging quality is significantly improved as well as the ambiguous images and noise speckle reduced with improvements and optimization of estimation method of spatial spectral modulus and phase retrieval algorithm.

关 键 词：成像系统 强度相干成像 相位恢复 先验信息 极大似然估计 空间频谱 

分 类 号：O438.2[机械工程—光学工程]