基于快速傅立叶变换的干涉SAR基线估计

Baseline Estimation of Interferometric SAR Based on Fast Fourier Transform

首先论述干涉SAR初始基线估计的基本原理;接着对用2维快速傅立叶变换(FFT)功率谱进行干涉SAR初始基线估计的具体算法进行了详细阐述;最后,基于1994年10月9日和10日的SIR CL波段单视复雷达数据,用该算法进行了干涉SAR初始基线的垂直分量估计,并结合用航天飞机轨道数据得到的初始基线平行分量估计值进行去平地相位的试验。将结果与只用航天飞机轨道数据得到的初始基线进行去平地相位的结果及本区域的地形图进行比较分析。

First, the basic principle of initial baseline estimation of SAR interferometry is discussed, then, the concrete algorithm using twodimensional Fast Fourier Transform(FFT) power spectrum to estimate the baseline is discussed in detail. At last, based on SIRC single look complex data on October 9 and 10, 1994, the perpendicular component of initial baseline is estimated using this algorithm, combining the parallel component of initial baseline obtained from the spaceborne orbit data, flatten phase removal trial is implemented by the initial baseline, the result is compared with that based on the spaceborne orbit data baseline modeling and topographic map.