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
CN104459633AActive Publication Date: 2015-03-25济钢防务技术有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
济钢防务技术有限公司
Publication Date
2015-03-25

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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.
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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 ...

Claims

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