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Wavelet domain interferometric synthetic aperture radar phase filtering method and apparatus

A technology of interferometric synthetic aperture and phase filtering, applied in the field of data processing, can solve the problems of inability to filter and the low precision of InSAR phase map filtering, and achieve the effect of improving the precision

Active Publication Date: 2015-11-25
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

[0004] At present, neither the mainstream mean InSAR phase filter algorithm nor the median InSAR phase filter algorithm can filter according to the local terrain and noise distribution; in order to solve these problems, a Lee filter algorithm with adaptive function to the local noise intensity and terrain distribution is proposed , although the Lee filtering algorithm has an adaptive function to the intensity of local noise and terrain distribution, the filtering accuracy of the InSAR phase image under complex terrain is low

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  • Wavelet domain interferometric synthetic aperture radar phase filtering method and apparatus
  • Wavelet domain interferometric synthetic aperture radar phase filtering method and apparatus
  • Wavelet domain interferometric synthetic aperture radar phase filtering method and apparatus

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Embodiment Construction

[0028] In various embodiments of the present invention, N-level wavelet packet transformation is performed on the data in the InSAR phase map; wherein, N>1, and N is a positive integer; identify the Nth-level wavelet domain signal, and mark the identified signal Growth process: filter the InSAR phase image after N-level wavelet transform, and then perform wavelet inverse transform on the filtered InSAR phase image.

[0029] The processing flow of the wavelet domain InSAR phase filtering method in the embodiment of the present invention, such as figure 1 shown, including the following steps:

[0030] Step 101, performing N-level wavelet packet transformation on the data in the InSAR phase map;

[0031] Specifically, the two-dimensional wavelet transform method can be selected according to the actual situation, and the three-level or multi-level wavelet transform is performed on the InSAR phase image;

[0032] How to perform wavelet transform specifically belongs to the prior ...

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Abstract

The invention discloses a wavelet domain interferometric synthetic aperture radar (InSAR) phase filtering method. The method comprises the following steps of carrying out N grade wavelet packet transformation on data in an InSAR phase diagram, wherein the N is greater than 1 and the N is a positive integer; identifying a Nth grade wavelet domain signal and marking a growth process of the identified signal; carrying out filtering on the InSAR phase diagram after the N grade wavelet transformation and carrying out inverse wavelet transformation on the InSAR phase diagram after the filtering. The invention also discloses an InSAR phase filtering apparatus.

Description

technical field [0001] The present invention relates to a data processing technology of Interferometric Synthetic Aperture Radar (InSAR), in particular to a wavelet domain InSAR phase filtering method and device. Background technique [0002] InSAR technology is widely used in the establishment of large-scale digital elevation models (Digital Elevation Model, DEM), topographic mapping, detection of the earth's surface deformation field, forest survey and mapping, oceanographic mapping, and land use and classification; among them, the earth's surface deformation field The detection includes: seismic displacement measurement, volcanic movement monitoring, glacier drift, surface subsidence and landslides caused by surface displacement monitoring. [0003] However, the noise in the InSAR phase map not only affects the accuracy of the elevation information and variation obtained in the InSAR application, but also the residual points caused by the noise increase the complexity of ...

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Application Information

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IPC IPC(8): G01S13/90G01S7/41
CPCG01S7/41G01S13/90G01S13/9023
Inventor 王宇陈永强刘璐李泓宇王静卢永春
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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