重轨InSAR干涉测量中的大气信号特征分析

给出了干涉测量中大气相位延迟与单次雷达测量时大气相位延迟的关系,并利用ERS Tandem数据对重轨干涉测量中的大气信号进行了定量的分析研究.实验数据的结果表明,干涉测量中大气相位延迟信号与地面高程有关,随高度增高干涉测量中的大气相位延迟信号变小;在重轨干涉测量中大气信号的结构函数和功率谱函数均呈现指数分布规律,并且在山区和平地,在不同的尺度呈现出不同的指数分布特性.该研究结果有助于建立重轨hSAR干涉测量中的大气信号模型.

Atmospheric signal behaviors in repeat-pass interferometry

The relation between the atmospheric phase delay in SAR interferometry (InSAR) and the atmospheric phase delay in single radar survey was given, and a one-day-apart ERS Tandem SAR pair acquired in January 1997 was selected to study the atmospheric signal in repeat-pass interferometry. The result shows that the atmospheric phase delay signal in repeat-pass interferometry is correlated with the elevation, that is, with the increase of the elevation, the atmospheric effect is decreased. Both the structure function and the power spectrum function of atmospheric signal in repeat-pass interferometry represent an exponential law, and they give a different exponent in a different scale in a mountainous area and a plain area. The results are useful for establishing the atmospheric model in repeat-pass interferometry.