Refined Multifrequency Interferometric SAR Phase Unwrapping for Extremely Steep Terrain

IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING(2022)

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摘要
Multifrequency (MF) interferometric synthetic aperture radar (InSAR) phase unwrapping (PU) technology is proposed for PU in steep terrains where the phase changes of adjacent pixels exceed the commonly required threshold of $\pi $ . Traditional MF PU methods will fail in the case of extremely steep terrain such as artificial buildings due to insufficient quality of phase noise suppression (PNS). In this article, we propose a refined MF-InSAR PU method that can be robustly applied for extremely steep terrain PU via two main contributions. First, an additional steep edge extraction step is introduced for geological local PU window generation to prevent inaccurate PNS across the extracted steep edges. Second, the traditional linear phase model is extended to a nonlinear one for more accurate MF local fringe frequency estimation in PNS. The computer simulations and the real dual-frequency airborne experiment validate the presented approach.
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关键词
Maximum likelihood estimation, Frequency estimation, Phase noise, Synthetic aperture radar, Channel estimation, Sensitivity, Probability density function, Interferometric synthetic aperture radar (InSAR), multifrequency (MF), nonlinear local fringe frequency estimation (LFFE), phase unwrapping (PU), steep edge extraction
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