High-precision phase unwrapping method adopting error iteration compensation

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

Active Publication Date: 2015-06-24
UNIV OF ELECTRONIC 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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  • High-precision phase unwrapping method adopting error iteration compensation
  • High-precision phase unwrapping method adopting error iteration compensation
  • High-precision phase unwrapping method adopting error iteration 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, and the standard deviation of Gaussian...

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Abstract

The invention discloses a high-precision phase unwrapping method adopting error iteration compensation. The method is a least square phase unwrapping algorithm based on traditional fast fourier transform (FFT), the error principal value of an unwrapped phase is obtained firstly, the principal value of the difference value of the unwrapped phase and an interference phase of each time is adopted as a wrapped interference phase of next iteration, least square unwrapping based on FFT is carried out, primary phase filtering is carried out, and an unwrapping error is compensated. Then, least square solving based on FFT is carried out on the unwrapping error; finally, repeated iteration processing is carried out, and the unwrapped phase is compensated after phase filtering is carried out on the remaining phase error. Compared with a traditional least square phase unwrapping algorithm based on FFT, the unwrapping error can still be effectively reduced under the conditions that the noise is large and the signal to noise ratio is low, unwrapping precision is effectively improved, the effect of the high unwrapping precision is achieved, and guarantees are provided for 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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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 ELECTRONIC SCI & TECH OF CHINA
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