关键词: 合成孔径雷达干涉测量, 基线, 地形特征, 矿区DEM

Abstract: Building mining area DEM based on InSAR technology has become hot in recent years,and researchers gradually focus on the practical application from the theory.The special surveying method of SAR system（side-looking imaging) and specific surface condition of mining area lead to many influence on high precision.From the principle of InSAR measuring elevation,and using the error theory knowledge,the impact of the relative error sources for elevation-precision measurement is systematically analyzed,and the relationship between measurement precision,phase error,baseline length,and baseline,inclination is deduced.And error propagation curves are made to show the influence rules of each other.Also the impact of topographical features on high-precision measurements is analyzed according to the features of mining subsidence.Finally a conclusion shows that the slope change caused by the mining subsidence has an obvious impact on high-precision InSAR measurements in partition.

Key words: InSAR, Baseline, Topography features, Mining area DEM