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A high-precision phase unwrapping method using error iterative compensation

A technology of iterative compensation and phase unwrapping, applied in the direction of re-radiation, radio wave reflection/re-radiation, measuring devices, etc., can solve the problems of global error propagation and global error, and achieve the effect of high unwrapping accuracy

Active Publication Date: 2017-04-05
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, since the unwrapping method does not go around but passes through the phase discontinuity region containing the residual points, it will cause global propagation of local errors, resulting in global errors

Method used

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  • A high-precision phase unwrapping method using error iterative compensation
  • A high-precision phase unwrapping method using error iterative compensation
  • A high-precision phase unwrapping method using error iterative compensation

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Embodiment Construction

[0064] The present invention mainly adopts the method of simulation experiment for verification, and all steps and conclusions are verified correctly on MATLABR2013a software. The specific implementation steps are as follows:

[0065] Step 1. Initialize the parameters required for the high-precision phase unwrapping method using error iterative compensation:

[0066] Initialize the parameters required for the high-precision phase unwrapping method using error iterative compensation, including: the number of azimuth points of the InSAR wrapped phase, denoted as N a =500; the number of points in the range direction of the InSAR winding phase, denoted as N r =500; InSAR winding phase to be unwrapped, denoted as ω(a,r), a=1,2,…,500, r=1,2,…,500, where a represents the a-th point in the azimuth direction, r represents the distance to the rth point; the number of error compensation iterations Niter=0, the maximum number of iterations Nmax=15, the standard deviation of the Gaussian...

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Abstract

The invention discloses a high-precision phase unwrapping method using error iterative compensation. It is based on the traditional fast Fourier transform (FFT) least squares phase unwrapping algorithm. First, the error principal value of the unwrapped phase is obtained, and each The main value of the difference between the secondary unwrapped phase and the interferometric phase is used as the "wrapped interferometric phase" of the next iteration, and the least squares unwrapping based on FFT is performed, and a phase filter is performed to compensate the unwrapping error. Then it is solved based on the least squares of FFT; Finally, iterative processing is repeated, and the residual phase error is subjected to phase filtering to compensate for the unwrapping phase. The present invention is similar to the least squares phase unwrapping algorithm of traditional Fast Fourier Transform (FFT). In the case of high noise and low signal-to-noise ratio, it can effectively reduce the unwrapping error, significantly improve the unwrapping accuracy and have the effect of high unwrapping accuracy, which provides a guarantee for the subsequent InSAR elevation inversion accuracy.

Description

technical field [0001] The invention belongs to the technical field of radar, and in particular relates to the technical field of interferometric synthetic aperture radar (InSAR) phase unwrapping. Background technique [0002] Interferometric Synthetic Aperture Radar (InSAR) is developed on the basis of Synthetic Aperture Radar (SAR) imaging technology. It is one of the technologies for obtaining digital elevation. The geometric relationship between the difference (that is, the interferometric phase) and the terrain is used to obtain terrain height information. InSAR has the characteristics of all-day, all-weather, high-precision and large-area surveying and mapping. It is an important remote sensing technology for extracting large-area surface three-dimensional images and terrain elevation change information. It is widely used in natural disaster monitoring, topographic mapping and natural resource investigation. field. With the development of InSAR technology, the accura...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90G01S7/02
CPCG01S13/9023
Inventor 张晓玲韦顺军郭立文范小天吴文俊
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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