摘要
相位解缠是干涉雷达生成ＤＥＭ的重要步骤之一。干涉相位中的残余点使相位解缠变得复杂。本文研究了残余点产生机理，建立了残余点发生概率的解析表达式。结果表明，在噪声存在的条件下，残余点产生不仅与两幅图像之间的相关系数有关，而且受地形坡度的影响。理论分析与模拟实验表明，地形变化愈大。
Phase unwrapping is a main problem during interferometric SAR processing for DEM. Residues make phase unwrapping difficult sophisticated. After residues are identified correctly, phases can be unwrapped in a consistent manner if suitable branch cuts are made. The process of selecting branch cuts is identifying the correct segments of phase discontinuity caused by noise or layover. This paper presents the probability of segments of phase discontinuity caused only by noise in SAR interferograms. Results have proved that the probability can be influenced both by terrain slopes and decorrelation. Moreover, the probability of residues grows up with the increase of terrain slopes, and is reduced with the increase of the correlation coefficient that is well known. In addition, the paper also presents the probability of segments of phase discontinuity when correlation coefficient equals zero and 1.
出处
《测绘学报》
EI
CSCD
北大核心
1999年第2期139-142,共4页
Acta Geodaetica et Cartographica Sinica
关键词
合成孔径雷达
残余点
相关系数
地形坡度
Interferometric SAR, Residues, Fringe density, Correlation coefficient, Terrain slopes
