根据InSAR的测量原理，对基于频域估算干涉图条纹频率并得到系统垂直基线的方法进行了详细的描述；进而分析研究了垂直基线和数字高程信息的关系。最后，利用实际数据仿真验证了该方法的可行性。

First, the basic principle of measurement using SAR interferometry is discussed, and then special algorithm of estimating the baselining is introduced in detail in terms of the frequency extracted from the coherent complex data. Finally the relationship between the baseline and digital elevation information is analyzed. Results of computer simulation were presented to demonstrate the correctness of analysis.

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