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Filtering process plays significant roles in the generation of a digital elevation model (DEM) from interferogram obtained by interferometric synthetic aperture radar (InSAR). In order to remove the distortion of a so-called singular unit (SU), this paper proposes two novel filtering techniques which both exhibit strong nonlinearity. The first method attempts to remove the distortion by focusing on...
This paper investigates the mechanisms of phase singular points (SPs) generation in interferometrie synthetic aperture radar (InSAR) interferogram. We construct a scaled experimental setup to fully control the electromagnetic-wave propagation. It is suggested that a major origin of SPs is the interference among scattered waves rather than additive noise such as thermal noise in electronics.
In principle, we can construct highly precise digital elevation model (DEM) with interferometric synthetic aperture radar (InSAR) observations. However, in actual observed images, we find so many rotaional points, namely, phase singular points (SPs), that we cannot determine the height accurately. It is significantly important to investigate the SP phenomenon. Presently the origin of the SPs is not...
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