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Multi-baseline and multi-band InSAR phase unwrapping method based on Chinese remainder theorem

A technology of Chinese remainder theorem and phase unwrapping, applied in radio wave measurement system, radio wave reflection/re-radiation, utilization of re-radiation, etc., can solve problems such as phase unwrapping, interferogram undersampling, etc., to improve reliability Solubility, low processing difficulty, and high processing accuracy

Inactive Publication Date: 2012-05-02
THE PLA INFORMATION ENG UNIV
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Problems solved by technology

However, interferograms in steep regions acquired with longer baselines or shorter wavelengths may be undersampled such that these regions do not satisfy the above assumptions and thus fail to perform correct phase unwrapping

Method used

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  • Multi-baseline and multi-band InSAR phase unwrapping method based on Chinese remainder theorem
  • Multi-baseline and multi-band InSAR phase unwrapping method based on Chinese remainder theorem
  • Multi-baseline and multi-band InSAR phase unwrapping method based on Chinese remainder theorem

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Embodiment Construction

[0033] The multi-baseline, multi-band InSAR phase unwrapping method based on the Chinese remainder theorem of the present invention introduces the Chinese remainder theorem into the field of multi-baseline, multi-band InSAR phase unwrapping, and its principle is analyzed as follows.

[0034] Such as figure 1 As shown, the main antenna S 1 and from the antenna S 2 , S 3 A single-engine three-receiver multi-baseline InSAR system is formed. Record flight height as H, side angle of view as θ, baseline horizontal angle as α, S 1 and S 2 The formed baseline is B, and the corresponding ground points of adjacent pixels on the obtained interferogram are P and P′ respectively, the relative elevation of P′ to P is dh, and P to antenna S 1 and S 2 The slant distances are R and R-ΔR, respectively.

[0035] According to the basic principle of InSAR, the elevation h of point P is:

[0036] h=H-Rcosθ (1)

[0037] In the formula, θ can be written as:

[0038] θ ...

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Abstract

The invention discloses a multi-baseline and multi-band InSAR phase unwrapping method based on Chinese remainder theorem, which comprises the following steps: 1. respectively obtaining N multi-baseline InSAR interferograms, the ratio of any two baselines after registration of which is a rational number, and N multi-band InSAR interferograms; 2. calculating phase difference of adjacent pixels; 3. constructing a modulus ratio according to a wavelength ratio, thus constructing an integral cycle number ni and a residue number fi; 4. establishing congruence equations about a fuzzy number of fuzzy phase differential; 5. calculating p; 6. calculating the fuzzy number ki; 7. calculating interferometric phase differential after unwrapping, and 8. calculating the unwrapping phase Phiui of any pixelelement in the interferograms. The method makes full use of the existing InSAR data, gives full play to the advantages of low processing difficulty and high processing accuracy of the technology of obtaining DEM through the multi-baseline and multi-band InSAR, effectively solves the problem of phase unwrapping of aliasing interference fringes in under-sampled situations in undulating terrain areas and improves the solvability and accuracy of the phase unwrapping.

Description

technical field [0001] The invention relates to a multi-baseline and multi-band InSAR technology, in particular to a multi-baseline and multi-band InSAR phase unwrapping method based on the Chinese remainder theorem. Background technique [0002] Multi-baseline, multi-band InSAR (Multi-baseline / Multi-Band Interferometric Synthetic Aperture Radar, multi-baseline / multi-band synthetic aperture radar interferometry) technology has become an important frontier in the development of InSAR technology, which uses long and short baselines and long and short wavelength interferometric data respectively The combination of advantages can solve the phase unwrapping problem of aliasing interference fringes in steep areas, improve the accuracy of phase unwrapping, and then improve the accuracy of DEM acquisition. [0003] Regardless of the traditional single-baseline InSAR technology or the emerging multi-baseline, multi-band InSAR technology, phase unwrapping is one of the key links in in...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
Inventor 张红敏徐青靳国旺秦志远周杨孙伟龚志辉
Owner THE PLA INFORMATION ENG UNIV
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