干涉合成孔径雷达基线的估计

ESTIMATION OF INTERFEROMETRIC SAR BASELINE

研究了对干涉合成孔径雷达系统有重要影响的基线的估计方法。根据多飞干涉合成孔径雷达系统的特性，基线在平台的运动过程中是变化的。为了充分利用现有的资料，首先根据干涉系统的轨道参数计算基线参数，然后利用有限的参考点信息，如角闪烁器，形成迭代算法，从而实现准确估计基线在运动中特征的目的。意大利Ｅｔｎａ火山口数据的处理结果验证了本文提出算法的可靠性。

The baseline is the key factor in InSAR systems, which will decide the accuracy of the target height calculated from the InSAR. For a two pass InSAR system, the parameter of baseline will change during the flying. And it should be estimated differently. The common way for calculating the Baseline is based on the DEM. Unfortunately, DEM is always difficult to obtain. To use the available data fully, this paper first calculates the baseline by the geometry of orbits. Then depending on the key points, e.g. reflection corners, this paper shows an iterative way to refine the baseline. The raw data of Etna in Italy, has been used to verify this algorithm.