Inversion of residual motion errors in airborne single and repeat pass interferometry in the presence of squint and large topography variations

Abstract:
The potential and necessity of the estimation and compensation of motion errors beyond the accuracy of up-to-date navigation systems has been demonstrated and proved in several studies during the last years. This paper presents two extensions to an approach based on subaptertures. It extends the so called ’multisquint’ algorithm to be used efficiently in cases of big squint angles, large baselines and strong topography variations within the images. The analysis is dedicated to repeat pass interferometry, but also an extension of the inversion to track deviations for single pass systems is presented. In this way, more accurate DEM’s can be obtained and increased accuracy for repeat pass interferometric motion compensation can be achieved.