方差分量估计在机载InSAR区域网平差中的应用

基于验后方差分量估计的思想,针对观测值中各类观测分量的方差难以直接估计的问题,研究了机载InSAR区域网平差干涉参数定标权值确定理论,设计了利用Helmert方差分量估计扩展模型的机载InSAR区域网平差干涉参数定标权值确定方法。采用我国机载双天线InSAR数据进行相关试验,表明验后估计定权能合理地顾及DEM的生成精度和拼接精度。

Application of Variance Components Estimation in Airborne InSAR Block Adjustment

Based on the idea of posterior variance component estimation,aiming at the problem that variance component for each observation component can't be estimated directly,the theory of weights determination for airborne InSAR interferometric parameters calibration with block adjustment is studied and the corresponding calibration method is designed on the basis of the extended model of variance components estimation of Helmert type.Calibration experiments performed on Chinese dual antenna airborne InSAR data confirm that the calibration schemes with posterior variance component estimated can take generation accuracy and mosaic accuracy of DEM into account reasonably.