干涉合成孔径雷达（INSAR）技术是利用同一景区不同视角的复数据相位信息，获取地面高程信息或地形变化信息的技术。其中参数估计是INSAR数据处理中必不可少的步骤，基线是形成数字高程模型（DEM）中的一个重要参数。文中由合成孔径雷达干涉测量的原理出发，从理论上推导出平地干涉相位周期与基线的关系式，得出了一种利用干涉相位周期估计基线的方法，由此对估计区域的选取进行讨论，并进一步通过实际雷达数据，最后通过实际干涉图验证此基线估计方法。

InSAR is a technology which usesthe phase with two different angles in same scene to get DEM and its change. The parameter estimation is a main process in InSAR data process and baseline is a very important parameter to develop high performance DEM. This paper give a method of baseline estimation based on the flat terrain. We begined with the analysis of interferometric phase. With the computation of baseline length and angle, we got a method to estimate baseline. We also talks about the selection of zeros where can be used to estimate baseline used the method of this paper.

TN958 TN957.52