摘要
干涉合成孔径雷达通过提取同一目标对应的两个回波信号之间的相位差,可以获取高精度、高分辨率的地面高程信息。从干涉SAR的基本原理入手,深入研究了干涉SAR的相干性和测高精度问题,并基于X波段极化干涉SAR原理样机系统参数,对该系统的干涉相干性和测高精度进行了仿真分析。实验结果表明对于1.7 m的有效基线,通过四视处理后,60°雷达视角范围内的测高精度优于2 m,由于该系统的乒乓模式可将有效基线长度提高一倍,因此四视处理后,60°雷达视角范围内的测高精度优于1 m。
Interferometric synthetic aperture radar can obtain high accuracy and high resolution elevation information by abstracting phase difference of two echo signals.We can measure surface deformation at the level of centimeter or even millimeter by using differential interferometry technology.In this paper,we study coherence and elevation precision based on a polarimetric interferometric SAR system made by No.38 Research Institute of CETC.Experiment results indicate that elevation precision is less than 2 meters for 1.7 meters baseline by 4-look processing in the range of 60 degrees radar look angle.Baseline length is twice for this system in the mode of ping-pong,thus elevation precision is less than 1 meter by 4-look processing in the range of 60 degrees radar look angle.
出处
《雷达科学与技术》
2010年第4期312-316,361,共6页
Radar Science and Technology
基金
国家863计划(No.2007AA12Z180)
关键词
干涉SAR
基线长度
相干系数
测高精度
interferometric synthetic aperture radar（SAR）
baseline length
correlation coefficient
elevation precision
