摘要
沿航迹干涉(ATI)技术是星载SAR系统的重要应用之一。通过对同一区域获取的复数SAR图像进行干涉处理,ATI-SAR系统可以直接检测到SAR图像每个像素点的多普勒偏移。对于进行洋流测速的星载ATI-SAR系统而言,基线长度、速度分辨率及速度测量误差是系统设计的三大要素,因此这里针对此三大要素进行了详细分析。给出了星载ATI-SAR的基本原理并推导了相应的公式。总结了基线选择的基本方法。分析和推导了速度分辨率和洋流测速误差。得出了相关结论,这些结论对未来的洋流测速ATI-SAR系统的设计具有重要的指导作用。
ATI （Along Track Interferometric） technique is one of the most important applications for spaceborne SAR （Synthetic Aperture Radar） systems. ATI-SAR systems can directly detect the Doppler offset associated with each pixel of a SAR image. This is achieved by interferometric combination of two complex SAR images of the same scene. The sea surface velocity can be estimated via the calculated interferometric phase. The baseline length, velocity resolution and velocity estimation error are three important factors in the process of spacebome ATI-SAR system design, and these three points are carefully investigated here. The basic principle and expression of spaceborne ATI-SAR system are presented. The selection method of baseline length is discussed. The velocity resolution is studied, as well as the velocity estimation error. Some conclusions are drawn to play an important role in future spaceborne ATI-SAR system design.
作者
闫贺
朱岱寅
Yan He, Zhu Daiyin(College of Information Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China)
出处
《系统仿真学报》
CAS
CSCD
北大核心
2018年第10期3861-3868,3874,共9页
Journal of System Simulation
基金
国家自然科学基金(61501231)
江苏省自然科学基金(BK20150759)
航空科学基金(20152052027)
中央高校基本科研业务费专项资金(NZ2016105)
关键词
星载SAR
ATI
洋流测速
误差分析
spacebome synthetic aperture radar
along track interferometric
sea surface velocityestimation
error analysis
