在大气中SAR的额外光程  

Excessive path for SAR in atmosphere

作　　者：韩文焌[1] 江长荫[2] 

机构地区：[1]中国电子科技集团公司第二十二研究所,河南新乡453003 [2]中国科学院国家天文台,北京100012

出　　处：《电波科学学报》2004年第6期658-662,共5页Chinese Journal of Radio Science

摘　　要：根据不规则体的尺度讨论了大气引起的SAR相位 (在此 ,描述为额外光程或额外时延 )。根据大气模型计算了SAR的额外时延、相位起伏噪声 ,结合不规则体的尺度解释了视场中心的位移和图像的畸变。总结出与工程设计有关的数据 ,诸如在太阳活动高、低年周期内 ,最佳频率的选择 ,在一般大气情况下 ,额外光程的范围 ,以及相位噪声的大小等。Signal phase (described as excessive path or excessive time delay here) for synthetic aperture radar (SAR) induced due to atmospheric irregularity with different scale length is discussed in this paper. Associating the scale length of irregularity, the center displacement of field of view and the distortion on the image is explained. Based on the atmospheric model, the excessive time delay and atmospheric phase noise are calculated. Some useful data for engineering design are listed, such as how to select the optimum working frequencies for solar activity durations of high and low periods, the range of excessive path under normal atmospheric condition, and the magnitude of phase noise.

关 键 词：综合孔径雷达(SAR) 大气效应 额外光程 

分 类 号：TN011[电子电信—物理电子学]