2.1.1. Temporal Decorrelation of the Radar Signal.2-2 2.1.2. Spatial Decorrelation of the Radar Signal.
A fundamental requirement for SAR interferometry is sufficient correlation between the two complex im-ages which are interferometrically combined, i.e. sufficient coherence between the backscattered signals received by the two InSAR antennas. Furthermore, the range of velocities or surface elevation...
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| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.539.7153 http://www.ifm.zmaw.de/uploads/media/koriolis_sect2.pdf |
| Summary: | A fundamental requirement for SAR interferometry is sufficient correlation between the two complex im-ages which are interferometrically combined, i.e. sufficient coherence between the backscattered signals received by the two InSAR antennas. Furthermore, the range of velocities or surface elevations which are mapped into a phase interval of 2pi must be adjusted to the scales of the velocity and / or height variations to be detected. 2.1. COHERENCE Assuming that the signal-to-noise ratio (SNR) of the radar is not a limiting factor, low correlation between two SAR images of the same scene will mainly result from low coherence of the backscattered field be-tween the two antenna locations in space and time, which can be an effect of temporal and / or spatial decorrelation. 2.1.1. Temporal Decorrelation of the Radar Signal In contrast to radar signals from stationary or quasi-stationary targets (land, sea ice), microwave back- |
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