卫星轨道和大气延迟误差联合校正的山地DEM提取

Joint correction of error of orbital and atmospheric delay for DEM generation in mountain area

针对轨道误差和大气延迟误差是制约ALOS PALSAR数据快速获取大面积及高精度数字高程模型的主要因素这一问题,该文提出一种基于埃尔米特(Hermite)插值和高程大气模型对两种误差进行联合矫正的方法。首先,采用埃尔米特插值法对轨道矢量数据进行插值,以提高去除平地效应的效果;然后,建立高程与相位之间的线性模型,去除与高程相关的大气延迟误差;最后,进行相位高程转换得到数字高程模型。利用陕西省彬县地区的两景ALOS PALSAR数据进行实验分析。结果表明,该方法获取的数字高程模型以航天飞机雷达地形测绘使命为参考的均方根误差为14.48m,比常规干涉方法获取的结果有很大的提高,证明了该方法的有效性。

The main factors which restrict the ALOS PLSAR data to obtain large area and high precision DEM results are orbit error and atmospheric delay error.In this paper,a method based on Hermite interpolation and elevation model for joint correction of two kinds of errors was proposed.Firstly,the ZHermite interpolation method was used to improve the removal of the ground effect.Then,the linear model of elevation and phase was set upto remove the atmospheric delay error.Finally,the DEM were obtained by the phase converting to height.Experiment was carried out with two scenes of ALOS PALSAR located at Bin county of Shaanxi province.The results showed that the RMSE was 14.48 mcompared with SRTM,having agreat improval than conventional interferometric method,which can prove the effectiveness of this method.