三基线毫米波InSAR的相位解缠及高程反演

Millimeter-wave InSAR phase unwrapping and DEM reconstruction based on three-baseline

场景内高程突变超过干涉雷达不模糊高程的一半时,会导致常规相位解缠绕方法失效,在毫米波段该问题尤为突出.研究了基于聚类分析的三基线毫米波InSAR相位解缠绕方法,改进了聚类分析中直方图包络波峰选取策略.对场景中高程突变引起的阴影区域相位噪声较大的问题,使用掩膜门限处理,改善了聚类分析结果.计算机仿真结果和机载毫米波三基线InSAR实际数据处理结果验证了上述方法的有效性.

Conventional phase unwrapping methods will fail when the height variation of highly steep terrain exceeds half of the ambiguity height. In the millimeter-wave band, this problem is particularly severe. The three-baseline millimeter- wave InSAR phase unwrapping method based on cluster analysis was studied. In cluster analysis, isolating the peaks on the wave curve of the histogram is improved. The mask on the shadow cast by the steep terrain is proposed in order to improve the cluster analysis. The validity of the proposed method was testified by both simulation and an example of its application.