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An iterative surface prediction insar imaging and height estimation method

An imaging and curved surface technology, which can be used in measurement devices, radio wave measurement systems, reflection/re-radiation of radio waves, etc., and can solve problems such as terrain geometric distortion

Active Publication Date: 2017-02-15
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, the current back-projection algorithm is to project InSAR data onto the ground plane or radar range-azimuth plane for imaging. If the terrain has severe fluctuations, the geometric distortion of the terrain is serious when projecting imaging on the ground plane or radar range-azimuth plane.

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  • An iterative surface prediction insar imaging and height estimation method
  • An iterative surface prediction insar imaging and height estimation method

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Embodiment Construction

[0060] The present invention mainly adopts the method of simulation experiment to verify, and all steps and conclusions are verified correctly on MATLABR2008b software. The specific implementation steps are as follows:

[0061] Step 1. Initialize InSAR imaging system parameters:

[0062] Initialize InSAR imaging system parameters, including: radar carrier wavelength λ=0.0188m, radar platform main antenna transmission signal bandwidth B=1×10 9 Hz, radar transmit pulse width T r =1×10 -5 s, radar sampling frequency F s =1.5×10 9 Hz, main antenna radar incident angle θ=45°, baseline length B between two groups of antennas l = 0.2828m, the angle between the baseline and the horizontal direction α = 45°, the radar pulse repetition frequency PRF = 2000Hz, the platform movement speed V r =[0,60,0]m / s, the number of sampling points N in the range direction of the radar system r =8192, the number of radar system azimuth sampling points N a = 256, the initial position of the mai...

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Abstract

The invention discloses an iterative curved surface prediction InSAR imaging and height estimation method. The method utilizes a back projection imaging algorithm to project InSAR original echo data onto the terrain height surface obtained by each iteration estimation for projection imaging, thereby obtaining the The interferometric phase under the terrain elevation surface, and then use the interferometric phase to perform elevation terrain inversion, and then perform height compensation on the terrain height surface. terrain height, thus realizing the integration of InSAR data imaging and height estimation, improving the accuracy of InSAR imaging and height estimation, and correcting the geometric distortion caused by terrain height fluctuations, that is, reducing the terrain geometric distortion, and obtaining the final InSAR imaging results and terrain elevation.

Description

technical field [0001] The invention belongs to the field of radar technology, in particular to the field of synthetic aperture radar (SAR) imaging technology. Background technique [0002] Interferometric Synthetic Aperture Radar (InSAR) is an extension of Synthetic Aperture Radar (SAR) imaging technology. It mainly uses more than two SAR images obtained by observing the same observation scene at different angles or at different time periods by more than two antennas or multiple voyages. SAR image interferometric phase information, combined with the imaging geometric relationship to invert the terrain elevation information, thus realizing the remote sensing technology of high-precision terrain three-dimensional surveying and mapping. InSAR has the advantages of large imaging area, high imaging accuracy, and all-weather and all-weather imaging. It has become an important remote sensing technology for extracting large-area surface three-dimensional images and terrain elevatio...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
CPCG01S13/9023G01S13/9017
Inventor 韦顺军张晓玲邹光浩熊海进
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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