多基线层析SAR系统基线设计研究  

Research on the baseline design for SAR tomography system

作　　者：刘志坤 姚佰栋[1] 盛磊[1] Liu Zhikun;Yao Baidong;Sheng Lei(The 38th Research Institute of China Electronics Technology Group Corporation,Heifei 230088,China)

机构地区：[1]中国电子科技集团公司第三十八研究所

出　　处：《电子测量技术》2019年第22期63-66,共4页Electronic Measurement Technology

摘　　要：随着SAR三维成像技术的不断发展,多基线层析SAR在很多领域发挥着重要的作用。为了解决多基线层析SAR三维成像时的基线设计难题,研究了多基线层析SAR的层析向分辨率、竖直向基线总长度、无模糊目标最大高度。推导了竖直向基线总长度的表达式,最大无模糊高度和分辨率、基线数的关系式。并结合SAR系统,计算了三维成像时基线间距离、竖直向基线总长度、无模糊目标最大高度。结果表明,在频率、飞行高度、高程分辨率确定情况下,当入射角为45°时,竖直向基线总长度最小;竖直方向上目标的最大无模糊高度和入射角、基线间隔数、高程分辨率有关,若要获得较大的目标最大无模糊高度,则需增加基线数、降低高程分辨率、增大入射角。With the development of SAR 3 D imaging technology, multi-baseline tomography SAR has plays an important role in many fields. In order to solve the baseline design problem in multi-baseline tomography SAR 3 D imaging, this paper studies geometric elevation resolution, total vertical length of baseline and the maximum unambiguous height of targets for SAR Tomography. The paper also deduces the equation of the total vertical length of baseline, and expression of the maximum unambiguous height and geometric resolution, number of baseline. Additionally, the article calculates length between baselines, total vertical length of baseline and the maximum unambiguous height based on a SAR system. The results show that the total vertical length of baseline is the smallest when the angle of incidence is 45° in the case of frequency, flight altitude and elevation resolution being certain. The maximum unambiguous height of targets in the vertical direction is related to the incident angle, the number of baseline intervals, and the elevation resolution. Increasing the baseline number and incident angle, and reducing the elevation resolution can obtain a larger target maximum unambiguous height.

关 键 词：层析SAR 多基线 高程分辨率 无模糊最大高度 

分 类 号：TN957.51[电子电信—信号与信息处理]