InSAR residual motion error estimation method and device considering topographic relief

Abstract

The invention discloses an InSAR residual motion error estimation method and device considering topographic relief, and the method comprises the steps: obtaining a multi-scene SAR image, carrying outpreprocessing, and calculating a topographic phase comprising an InSAR residual motion error; calculating a simulated terrain phase by using the external DEM data; solving the difference between the terrain phase containing the InSAR residual motion error and the simulated terrain phase, carrying out the phase unwrapping of the difference, and taking the unwrapped differential interferometric phase as an observation value; constructing a differential interferometric phase parameterization model related to InSAR interferometric geometric parameters, DEM errors and baseline error components; foreach distance row pixel of each slave image, matching the observation value of the differential interferometric phase with a differential interferometric phase parameterization model to construct anequation to obtain an observation equation; and solving DEM errors and baseline error components in the multi-baseline observation equation set. The invention can accurately estimate the residual motion error.

Description

technical field [0001] The invention belongs to the technical field of synthetic aperture radar interferometry, and in particular relates to an InSAR residual motion error estimation method and device taking into account terrain fluctuations. Background technique [0002] In recent years, Synthetic Aperture Radar Interferometry (InSAR) technology has possessed the ability of large-scale high-precision terrain mapping. For example, high-precision DEM data covering the world have been released, such as STRM DEM, TanDEM-X DEM, etc., and in It has been widely used in large-scale disaster monitoring and resource survey. Airborne SAR systems (such as PI-SAR, E-SAR, F-SAR, UAVSAR, etc.) rely on the characteristics of flexible maneuverability, short revisit time, and low flight altitudes are not easily affected by the atmosphere, so they provide higher resolution for local areas. , Higher precision DEM inversion brings great convenience. [0003] As we all know, the airborne SAR s...

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Problems solved by technology

However, in fact, there are unavoidable terrain fluctuations in the scene. On the one hand, the phase error characteristics caused by RMEs will be covered by the terrain phase, making it difficult to estimate RME accurately. On the other hand, the mutual coupling between RMEs and terrain will further distort the real Elevation information for

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