Phase unwrapping algorithm based on UIF (unscented information filtering)

A technology of phase unwrapping and information filtering, applied in radio wave reflection/re-radiation, radio wave measurement systems, instruments, etc.

Active Publication Date: 2017-05-24
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

The phase unwrapping technique can recover the real interferometric phase from the main value interval of the phase mapped by the modulus 2π of the interferogram, and is widely used in digital holographic microscopy, magnetic resonance imaging processing, speckle imaging, optical interferometry, adaptive optics, and synthetic aperture radar interferometry In the f

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  • Phase unwrapping algorithm based on UIF (unscented information filtering)
  • Phase unwrapping algorithm based on UIF (unscented information filtering)
  • Phase unwrapping algorithm based on UIF (unscented information filtering)

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[0060] The present invention will be further described below in conjunction with the accompanying drawings.

[0061] In order to verify the performance of the algorithm, it will be compared with commonly used algorithms, including quality map guidance algorithm, extended Kalman filter phase unwrapping algorithm (EKFPU) and unscented Kalman filter phase unwrapping algorithm (UKFPU) in simulation and measured data experiments.

[0062] figure 1 It is a block diagram of phase unwrapping algorithm based on odorless information filtering.

[0063] figure 2 (a) is the simulated real interferogram, figure 2 (b) is a noisy interferogram with a signal-to-noise ratio of 4.94dB. Before phase unwrapping, the mean filter (3×3) is used to filter the noise-containing interferogram, and the interferogram after filtering is shown in figure 2 (c).

[0064] Figure 3-Figure 6 They are quality map guided algorithm, extended Kalman filter phase unwrapping algorithm (EKFPU), unscented Kalm...

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Abstract

The invention discloses a phase unwrapping algorithm based on UIF (unscented information filtering). The phase unwrapping algorithm comprises the following steps of firstly, establishing an UIF phase unwrapping algorithm recursive state estimation model, utilizing a phase gradient estimation method based on an AMPM (amended matrix pencil model) to obtain the phase gradient information required by the recursive state estimation model, and utilizing an LEVENBERG-MARQUARDT method to optimize the recursive state estimation model, so as to improve the algorithm convergence; introducing a heapsort quick mass map guide strategy, using the adjacent wrapping pixel of the unwrapped pixel as a heap array of a to-be-unwrapped pixel, and adjusting the heap array as the maximum heap according to the quality value of the to-be-unwrapped pixel; in each unwrapping step, utilizing the UIF phase unwrapping algorithm recursive state estimation model to unwrap the optimum to-be-unwrapped pixel at the root node of the heap array, deleting the pixel from the heap array, and adjusting the heap array as the maximum heap, until the phases of all wrapped pixels are unwrapped. The phase unwrapping algorithm has the characteristics that the accuracy is higher, and the stability is higher.

Description

technical field [0001] The invention relates to the field of interferometric phase unwrapping algorithms in information filtering applications, in particular to a phase unwrapping algorithm based on odorless information filtering. Background technique [0002] Interferometric synthetic aperture radar (InSAR) can obtain three-dimensional surface information and elevation change information with high precision and high reliability, and is widely used in land surveying and mapping, ocean monitoring, volcano monitoring and earthquake detection and other fields. Interferometric phase unwrapping is a particularly critical link in the application of Interferometric Synthetic Aperture Radar (lnSAR) technology, and its phase unwrapping accuracy directly affects the height measurement accuracy of Interferometric Synthetic Aperture Radar (InSAR) system, so the issue of interferogram unwrapping has received more and more attention . The phase unwrapping technique can recover the real i...

Claims

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Application Information

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IPC IPC(8): G01S13/90
CPCG01S13/90G01S13/9023
Inventor 谢先明代高兴
Owner GUILIN UNIV OF ELECTRONIC TECH
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