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Method for inverse computing digital surficial height from image of synthetic aperture radar in all polarization by one time of flight

A terrestrial digital and inversion technology, applied in the direction of reflection/re-radiation of radio waves, utilization of re-radiation, measurement devices, etc., can solve the problem of high technical difficulty of INSAR

Inactive Publication Date: 2005-12-28
FUDAN UNIV
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Problems solved by technology

[0003] However, the related technologies of INSAR are very difficult, and not every terrain can easily obtain coherent SAR images that meet the requirements

Method used

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  • Method for inverse computing digital surficial height from image of synthetic aperture radar in all polarization by one time of flight
  • Method for inverse computing digital surficial height from image of synthetic aperture radar in all polarization by one time of flight
  • Method for inverse computing digital surficial height from image of synthetic aperture radar in all polarization by one time of flight

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Experimental program
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Embodiment 1

[0104] Embodiment 1, Guangdong Huizhou area.

[0105] Using the L-band data observed by SAR SIR-C on Guangdong Province, China on October 4, 1994 provided by the Jet Propulsion Laboratory (JPL) of the California Institute of Technology, the center of the image is about (114.561°E, 22.815°N), and every The size of a pixel is 12.5×12.5m 2 . The incident angle of the SAR at the center of the image is 32.85°. image 3 It is a backscattered vv, hh, hv total power image with a size of 512×512 pixels intercepted from the original image, and its center is located at (114.7826°E, 23.1359°N), located in Huizhou, Guangdong Province, China.

[0106] From image 3 You can see the undulating hills running north-south. In order to highlight the main trend of the terrain, we have omitted some more subtle local undulations. Note that the horizontal azimuth γ defined here is the slope trend and orientation angle (such as figure 1 (a) shown).

[0107] S A and S R The calculation res...

Embodiment 2

[0109] Embodiment 2, Alishan area, Taiwan

[0110] Using the L-band data observed by SAR SIR-C on Taiwan, China on October 4, 1994 provided by the Jet Propulsion Laboratory (JPL) of the California Institute of Technology, the center of the image is about (120.964°E, 23.487°N), each The pixel size is 12.5×12.5m 2 . The incident angle of the SAR at the center of the image is 32.85°. Figure 8 It is a backscattered vv, hh, hv total power image with a size of 512×512 pixels intercepted from the original image, and its center is (120.8626°E, 23.6659°N), located in the Alishan area of ​​Taiwan, China.

[0111] Intuitive terrain structure and very simple ground elevation map reflected by inverted DEM and original SAR image [13] It is basically the same, and the direction of its main terrain is also consistent with the light and dark texture of the SAR image.

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Abstract

The invention is a method for retrieving ground digital elevation from a single-flight full-polarization synthetic aperture radar image. Using the fully polarized scattering Mueller matrix solution, the migration of the orientation angle ψ is derived, and with the help of the transformation of the Euler angle, the connection between the migration of ψ determined by the three Stokes parameters and the range angle β and horizontal azimuth angle γ of the inclined surface pixel is established . Under the condition of only single-flight SAR data, adaptive threshold binarization and image morphology thinning algorithm are used to determine γ and β, as well as the ground surface range azimuth slope and horizontal azimuth slope. Therefore, the Poisson equation of the DEM is numerically solved with the complete multigrid algorithm, and the DEM inversion is obtained.

Description

field of invention [0001] The invention belongs to the technical field of space remote sensing and communication, and in particular relates to a method for retrieving ground digital elevation by space-borne synthetic aperture radar. Background technique [0002] Spaceborne Synthetic Aperture Radar (SAR) polarization measurement and imaging technology is one of the most important advances in space earth observation and remote sensing in the 1990s. It can observe the scattered echoes of the ground and ocean with high resolution all-weather and can image them. In recent years, on the basis of SAR, interferometric SAR (INSAR) technology with coherent flight or dual-antenna flight has been developed. In 2000, Lee et al. of the U.S. Naval Laboratory used an approximate scattering amplitude function to prove that the extreme value of the echo generated by ground undulations is at the incident polarization angle ψ≠0. This migration of ψ≠0 can be used to calculate the elevation of g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/42G01S13/90
Inventor 金亚秋罗霖
Owner FUDAN UNIV
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