Forcing Scale Invariance in Multipolarization SAR Change Detection

• Published in: IEEE transactions on geoscience and remote sensing Vol. 54; no. 1; pp. 36 - 50
• Main Authors: Carotenuto, Vincenzo, De Maio, Antonio, Clemente, Carmine, Soraghan, John J., Alfano, Giusi
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.01.2016; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Change detection; Channels; Coherent change detection; Constant false alarm rate; Detectors; False alarms; Image detection; Invariants; Linear matrix inequalities; maximal invariant; multipolarization; Orbits; Radar; Radar data; Receivers; scale invariance; Space vehicles; Statistics; Synthetic aperture radar; Testing; Coherent change detection; scale invariance; multipolarization; maximal invariant
• ISSN: 0196-2892; 1558-0644
• DOI: 10.1109/TGRS.2015.2449332

This paper considers the problem of coherent (in the sense that both amplitudes and relative phases of the polarimetric returns are used to construct the decision statistic) multipolarization synthetic aperture radar change detection starting from the availability of image pairs exhibiting possible power mismatches/miscalibrations. The principle of invariance is used to characterize the class of scale-invariant decision rules which are insensitive to power mismatches and ensure the constant false alarm rate property. A maximal invariant statistic is derived together with the induced maximal invariant in the parameter space which significantly compresses the data/parameter domain. A generalized likelihood ratio test is synthesized both for the cases of two- and three-polarimetric channels. Interestingly, for the two-channel case, it is based on the comparison of the condition number of a data-dependent matrix with a suitable threshold. Some additional invariant decision rules are also proposed. The performance of the considered scale-invariant structures is compared to those from two noninvariant counterparts using both simulated and real radar data. The results highlight the robustness of the proposed method and the performance tradeoff involved.