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InSAR interferometric phase unwrapping method based on semi-parametric model

A semi-parametric model and interferometric phase technology, applied in the field of InSAR/DInSAR data processing

Active Publication Date: 2015-09-16
TONGJI UNIV
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Problems solved by technology

However, due to the limitation of the number of observation data or the requirement of data acquisition time synchronization, these methods are difficult to be widely used in actual data processing, so it is necessary to propose an effective method that can improve the accuracy of the unwrapped phase

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Embodiment Construction

[0045] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0046] This embodiment provides an InSAR interferometric phase unwrapping method based on a semi-parametric model, which is used to obtain the unwrapped phase during InSAR or DInSAR data processing, such as figure 1 As shown, the following steps are included: 1) establishment of a semi-parametric phase unwrapping model; 2) solution of the semi-parametric phase unwrapping model and estimation of the unwrapped phase.

[0047] In step 1), the interferometric phase is used to calculate the phase difference of the winding phase. The semi-parametric phase unwrapping model takes into account...

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Abstract

The invention relates to an InSAR interferometric phase unwrapping method based on a semi-parametric model. The method is used for acquiring an unwrapping phase from an interferometric phase in the InSAR or DInSAR data processing process. The method specifically includes the following steps that firstly, a semi-parametric phase unwrapping model is established; secondly, the semi-parametric phase unwrapping model is resolved, and the unwrapping phase is estimated. Compared with the prior art, the method takes system errors in the InSAR / DInSAR interferometric phase into consideration, non-parametric components adopting the semi-parametric model are considered, modeling and compensation are performed on the non-parametric components, and therefore influences of the method on evaluation of the unwrapping phase are eliminated, the defects of a traditional method based on a least-square phase unwrapping algorithm are made up for, influences of the system errors on a phase unwrapping result are reduced, and the precision of terrain estimation and deformation monitoring is improved.

Description

technical field [0001] The invention relates to the technical field of InSAR / DInSAR data processing, in particular to an InSAR interferometric phase unwrapping method based on a semiparametric model. Background technique [0002] The interferometric phase map can be obtained by multiplying the two registered SAR images by complex conjugates. The value range of the interferometric phase is in the (-π, π] interval. Phase unwrapping is an important part of InSAR / DInSAR data processing. After phase unwrapping, the interferometric phase can obtain the unwrapped phase that reflects the surface terrain or surface deformation; therefore, the accuracy of the unwrapped phase directly affects the reliability of the InSAR / DInSAR data processing results; in addition, in the process of InSAR / DInSAR data acquisition and data processing Due to the influence of atmospheric tropospheric delay, baseline and DEM errors, the interferometric phase inevitably contains the influence of systematic e...

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Application Information

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IPC IPC(8): G06F19/00
Inventor 童小华刘爽张松林谢欢陈鹏刘世杰
Owner TONGJI UNIV
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