Wavelet domain InSAR interferometric phase filtering method combined with local frequency estimation

A technology of interferometric phase and frequency estimation, which is applied in the field of electronic information technology radar, can solve problems such as denoising and detail preservation, and achieve strong detail preservation ability, good denoising effect, and noise filtering effect

Active Publication Date: 2015-03-25
济钢防务技术有限公司
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Problems solved by technology

[0010] In order to solve the above problems, the present invention provides a wavelet domain InSAR interferometric phase filtering method combined with local frequency estimation to overcome the shortcomings of existing wavelet domain interferometric phase filtering methods that cannot take into account both denoising and detail preservation, thereby improving the interferometric phase the accuracy of

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  • Wavelet domain InSAR interferometric phase filtering method combined with local frequency estimation
  • Wavelet domain InSAR interferometric phase filtering method combined with local frequency estimation
  • Wavelet domain InSAR interferometric phase filtering method combined with local frequency estimation

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[0018] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be noted that, in the drawings or descriptions of the specification, similar or identical parts all use the same figure numbers. Implementations not shown or described in the accompanying drawings are forms known to those of ordinary skill in the art. Additionally, while illustrations of parameters including particular values ​​may be provided herein, it should be understood that the parameters need not be exactly equal to the corresponding values, but rather may approximate the corresponding values ​​within acceptable error margins or design constraints.

[0019] In the present invention, after transforming the interferometric phase into the wavelet domain, the local frequency estimation is used to determine the ...

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Abstract

The invention provides a wavelet domain InSAR interferometric phase filtering method combined with local frequency estimation. According to the wavelet domain InSAR interferometric phase filtering method, local frequency estimation is utilized for distinguishing a useful information sub-band and a noise sub-band in a wavelet coefficient of a complex domain interferometric phase, a threshold value contraction method and a neighbourhood threshold value contraction method have the advantages of being good in denoising effect and strong in detail keeping capacity respectively, the advantages are utilized for carrying out neighbourhood threshold value contraction on the wavelet coefficient of the sub-band where the useful information is located, general threshold value contraction is carried out on the wavelet coefficients of the other sub-bands, and therefore noise is filtered out as much as possible, meanwhile, the detail information of interference fringes is kept not damaged, high-precision interferometric phase filtering is achieved, and conditions are provided for high-precision interferometric measurement.

Description

technical field [0001] The invention relates to the technical field of electronic information technology radar, in particular to a wavelet domain InSAR interferometric phase filtering method combined with local frequency estimation. Background technique [0002] Interferometric Synthetic Aperture Radar (InSAR) uses the interferometric phase information of two channels of Synthetic Aperture Radar (SAR) to extract the elevation information or change information of the surface, and expands the measurement of SAR to three-dimensional space. All-weather, high-precision features, so it has a wide range of applications in many fields such as terrain surveying, glacier research, marine surveying and mapping, and land subsidence monitoring. [0003] The accuracy and reliability of interferometry depends largely on the quality of the interferogram. However, in practical systems, affected by various decoherence factors such as thermal noise decoherence, temporal decoherence, baseline ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/02
CPCG01S13/9023
Inventor 李芳芳丁赤飚雷斌林雪胡东辉仇晓兰
Owner 济钢防务技术有限公司
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