摘要
基线长度是决定干涉合成孔径雷达(InSAR)测高精度的关键量。长基线时误差传递系数小,利于测高精度,但基线过长会使系统相干性下降和处理难度增大。文中探讨了相干性和相位展开处理的机理,分析了基线长度与二者的关系,提出了一项衡量相位展开难度的指标,给出了利用SAR工作的侧视几何缓解相干性和相位展开难度对基线长度限制的2种处理方法及其效果。上述2种处理方法可允许InSAR系统采用更长的基线。
The length of baseline is a significant parameter for interferometric synthetic aperture radar （InSAR）. A long baseline is propitions to digital elevation model （DEM） precision, which means small error transfer coefficient. However, if the baseline were too long, it would result in correction decreasing and processing difficulty increasing. In this paper, toward beseline length, the principle of correlation and the processing of phase unwrapping are discussed theoretically, the relationship between the baseline length and correlation as well as phase unwrapping is analyzed in illustration, an indicator is proposed to evaluate the difficulty of phase unwrapping, the results and its effects are presented by using the side-looking geometry in SAR operation to alleviate the re- quirement to baseline length by correlation and phase unwrapping. The two processing strategies can make InSAR system to adopt a longer baseline.
出处
《现代雷达》
CSCD
北大核心
2011年第5期12-16,共5页
Modern Radar
