EURASIP Journal on Applied Signal Processing
Volume 2005 (2005), Issue 20, Pages 3206-3219
doi:10.1155/ASP.2005.3206
Abstract
Synthetic aperture radar interferometry (InSAR) is a
powerful technique to derive three-dimensional terrain images.
Interest is growing in exploiting the advanced multi-baseline mode
of InSAR to solve layover effects from complex orography, which
generate reception of unexpected multicomponent signals that
degrade imagery of both terrain radar reflectivity and height.
This work addresses a few problems related to the implementation
into interferometric processing of nonlinear algorithms for
estimating the number of signal components, including a system
trade-off analysis. Performance of various eigenvalues-based
information-theoretic criteria (ITC) algorithms is numerically
investigated under some realistic conditions. In particular,
speckle effects from surface and volume scattering are taken into
account as multiplicative noise in the signal model. Robustness to
leakage of signal power into the noise eigenvalues and operation
with a small number of looks are investigated. The issue of
baseline optimization for detection is also addressed. The use of
diagonally loaded ITC methods is then proposed as a tool for
robust operation in the presence of speckle decorrelation.
Finally, case studies of a nonuniform array are studied and
recommendations for a proper combination of ITC methods and system
configuration are given.