InSAR最小二乘相位解缠权重确定的一种新方法

摘要

The decoherence phenomena such as Low-SNR radar signal, shadows and layover caused by topography etc, causing phase data discontinuous, makes the result of unwrapping phase inaccurate or completely wrong. On the basis of the analysis of influencing factors to weighted choice, a new method to choose the weightes according to the measure of confidence in frequency domain was developed. The experiments show the defect of sub-estimate to the slope of least squares method can be well overcome. It is proved that this method has good rational and stable performance.%雷达信号的低信噪比、地形起伏引起的阴影、遮掩以及其它种种原因造成的去相干现象导致相位数据的不连续,使得相位解缠结果出现偏差甚至是完全错误.在分析影响最小二乘相位解缠权重选择因素的基础上,将频域置信度作为权重选择方法进行相位解缠数据处理,结果表明,该方法很好地克服了最小二乘法对于相位坡度欠估计的缺点,且解缠结果具有较高精度和稳定性.