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SBAS-DInSAR method based on nonlinear optimization strategy

A nonlinear optimization and strategy technology, applied in the field of radar, can solve problems such as low efficiency, reliability affecting the effectiveness of the method, and unsatisfactory unwrapping effect of the unwrapping algorithm, so as to avoid errors and improve the efficiency of deformation calculation

Active Publication Date: 2015-06-24
BEIHANG UNIV
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Problems solved by technology

However, this method requires phase unwrapping. Although there are a variety of phase unwrapping algorithms, each has its own disadvantages. In time-series images with a large time span, due to the complex deformation of the ground surface, the unwrapping algorithm often fails in some The effect of area unwrapping is not ideal, and the reliability of phase unwrapping will directly affect the effectiveness of this method
At the same time, the time complexity of the unwrapping algorithm is extremely high, making the method less efficient

Method used

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  • SBAS-DInSAR method based on nonlinear optimization strategy
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  • SBAS-DInSAR method based on nonlinear optimization strategy

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Embodiment

[0090] The present invention is a SBAS-DInSAR technology based on a nonlinear optimization strategy, and the specific embodiments are:

[0091] Step 1: Use the radar antenna repeat orbit flight mode to simulate the set scene to generate K+1=17 SAR images. In the center of the simulation scene, there is a cone-shaped mountain with a diameter of 700m, with an initial height of 119.96m, and its peak height increases at an average rate of 0.01m per year. Except for the peaks, the elevation values ​​of other points in the scene are always zero. The time when the height of the mountain reaches 120m is recorded as the 0th year, the time span is 8 years, and the SAR image sequence is generated at a sampling interval of 0.5 years. In the scene, 110 scattered points with large backscattering coefficients are arranged as high-coherence points, such as figure 2 Shown.

[0092] Determine the main and auxiliary images according to the principle of combining small baseline interference image pa...

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Abstract

The invention discloses an SBAS-DInSAR method based on a nonlinear optimization strategy, and relates to the technical field of radar. The method can achieve resolving of an equation without phase unwrapping, an optimization object function relative to a surface deformation rate is constructed through establishing a winding differential interferometry phase nonlinear model, the equation is resolved through a quasi-Newton method, surface deformation information is extracted, and a novel SBAS-DInSAR surface deformation measuring method is achieved. According to the SBAS-DInSAR method based on the nonlinear optimization strategy, an error introduced by a phase unwrapping algorithm is avoided, and deformation calculation efficiency is improved simultaneously; under the circumstance of only using a winding phase, a high-precision surface deformation result can be obtained, and a novel way is provided for surface deformation measurement.

Description

Technical field [0001] The present invention relates to the field of radar technology, in particular to a small baseline ensemble-aperture radar differential interferometry technology based on a nonlinear optimization strategy. Background technique [0002] Small baselines are assembled into aperture radar differential interferometry (SBAS-DInSAR) technology is a method of combining SAR images into several subsets according to the principle of small baselines, that is: the baseline distance in the collection is small and the baseline distance between the collections is large, and then the The surface scattering characteristics maintain stable high-coherence point phase information in a long time interval, establish a high-coherence point differential phase model, and obtain the measurement technology of surface deformation through the solution of the model. How to effectively calculate the high-coherence point deformation rate is one of the key factors to ensure high-precision su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/9023
Inventor 徐华平王碧君
Owner BEIHANG UNIV
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