高相干点地基InSAR的大气延迟纠正

GB-InSAR atmospheric delay for highly coherent points correction

针对目前地基合成孔径雷达干涉测量技术中大气影响造成的相位延迟校正方法存在的校正精度低、方法复杂、技术要求高等不足,提出了一种基于高相干点的地基InSAR大气延迟相位函数模型校正方案。该方案不需多幅SAR影像,不需人工布点,节省了大量人力物力。以高相干点的相干值作为权阵参与计算,该方法可得到更精确的校正结果。运用该方法将地基雷达对山西省吕梁市林家坪工程滑坡获取的数据进行大气延迟改正的实验。结果表明:所提方案不仅处理方法简单,改正效果明显,而且能满足绝大多数类似工程的精度要求,更为经济实用。

In view of the the phase delay correction method at present caused by the atmospheric effects in ground-based synthetic aperture radar interferometry technology has some disadvantages such as the accuracy is low,the method is complicated,the technical requirements are high and so on,this article propose a method based on the highly coherent points for function model correction of GB-InSAR atmospheric delay phase.This method doesn＇t need many SAR images,doesn＇t need manual layout,also saves a lot of manpower and resources.In addition,because of using the coherence values of highly coherent points as weight matrix to calculate,this method can obtain more accurate correction results.Using the method and combined with the engineering landslide data collected by ground-based radar of Linjiaping area of Lüliang city,Shanxi province to achieve atmospheric delay correction.The results show that the new method is simple and effective,and can meet the accuracy requirements of most similar projects,and it is more economical and practical.