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A Method and Device for Insar Residual Motion Error Estimation Considering Terrain Undulation

A motion error and terrain technology, applied in the field of synthetic aperture radar interferometry, can solve problems such as distorted elevation information and RME difficult to estimate accurately, so as to improve calculation efficiency, avoid solution instability, and ensure accurate estimation.

Active Publication Date: 2021-11-23
CENT SOUTH UNIV
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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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  • A Method and Device for Insar Residual Motion Error Estimation Considering Terrain Undulation
  • A Method and Device for Insar Residual Motion Error Estimation Considering Terrain Undulation
  • A Method and Device for Insar Residual Motion Error Estimation Considering Terrain Undulation

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[0083] In order to make the purpose of the present invention, technical solutions and advantages thereof clearer, adopt the P-band multi-baseline data obtained during the flight test in 2008 by the airborne E-SAR system of German Aeronautics and Space Agency, the specific parameters are shown in attached table 1, for the present invention Explain in depth and detail. The topographic relief of the SAR image data coverage area is 150-380m above sea level, and this area is a typical vegetation coverage area, with an average tree height of 18m and the highest tree height of 30m. Due to the strong penetrability of the P-band, a large part of the DEM error is contributed by the difference in the phase center of the vegetation. The specific implementation cases described here are only used to explain the present invention, not to limit the present invention.

[0084] Based on the P-band multi-baseline interferometric data of the airborne E-SAR system adopted above, such as figure ...

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Abstract

The invention discloses a method and device for estimating InSAR residual motion error taking into account terrain fluctuations, wherein the method includes: acquiring multi-view SAR images and performing preprocessing, calculating terrain phase including InSAR residual motion error; using external DEM data to calculate simulated terrain Phase; calculate the difference between the terrain phase containing the InSAR residual motion error and the simulated terrain phase, and perform phase unwrapping on the difference, and then use the unwrapped differential interferometric phase as the observed value; construct a model with the parameters of InSAR interferometric geometry, DEM error and The differential interferometric phase parameterized model of the baseline error component; for each pixel of each distance row of the slave image, the observed value of the differential interferometric phase is matched with the differential interferometric phase parameterized model to construct an equation to obtain the observation equation; solve DEM error and baseline error components in multi-baseline observation equations. The present 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 considering 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 system is...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90G01S7/02
CPCG01S7/02G01S13/9023
Inventor 朱建军王会强付海强李志伟冯光财汪长城贺文杰刘志卫
Owner CENT SOUTH UNIV
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