Parametric Estimation and Model Selection Based on Amplitude-Only Data in PS_Interferometry
Nico Adam(1) , Richard Bamler(1)
, Michael Eineder(1)
, and Bert Kampes(1)
The PS-Interferometry (PSI) invented at POLIMI allows to monitor subsidence effects with millimetre
accuracy and has meanwhile developed into an operational method. Nevertheless, the improvement of this powerful surveying
technique is subject of the current work.
On the one hand the subsidence estimation
accuracy and on the other the permanent scatterer
(PS) density can be improved. The implemented algorithm contributes to both. The two practically most
important scatterer configurations can be
detected by a parametric estimation. I.e. a
single realistic scatterer can be distinguished
from two dominant point scatterers inside a resolution cell.
The implemented algorithm is suitable
for operational processing systems for several reasons.
Firstly, the proposed technique uses the scene's amplitude
only and can consequently be applied at a very early stage of the PSI processing. All the following algorithms
can take advantage from the derived information.
Secondly, the estimation is robust
regarding misregistration and radar return
calibration inaccuracies of few outlier scenes.