干涉合成孔径雷达（InSAR)成像处理中，干涉相位图在相位展开之后，还需作相位高度转换和数字地形高度图（DEM）的校准处理，本文基于InSAR成像原理的一种新的近似描述，按照不同的物理意义将干涉相位差分成三个不同的分量，然后据此讨论了从三维相位图到DEM的转换以及DEM的校准处理，仿真结果验证了该方法的正确性。

In interferometric synthetic aperture radar, after 2 dimenision phase unwrapping processing, the conversion from phase to height and the DEM geocoding are essential. An new description model is proposed to illustrate the principle of the interferometric synthetic aperture radar. Through this model, interferometric phase difference is divides into three proportions, which have the distinct physical meanings. According to these analyses, the processes of geocoding of digital elevation model are discussed. This method is proved by the processing result of emulated data.

TN958 TN957.52