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Maximum Entropy and MAP Estimation Using Conjugate Gradient Method for Phase Unwrapping

Journal Name:

  • International Journal of Science and Engineering Investigations

Publication Year:

  • 2012

Key Words:

Author NameUniversity of Author
Abstract (2. Language): 
We constructed a practical and useful method for phase unwrapping in remote sensing using synthetic aperture radar (SAR) interferometry. First, we constructed a method of maximum entropy to achieve phase unwrapping with high degree of accuracy. Using Monte Carlo simulation for one dimensional artificial wave-front, we found that the method of maximum entropy served an accurate method for phase unwrapping, if we assumed an appropriate model of true prior. Then, in order to construct a practical method, we constructed a deterministic limit of the method of maximum entropy based on a maximum of a posteriori (MAP) estimation using conjugate gradient (CG) method. Using numerical simulation for artificial wave-fronts, we found that the CG method realized phase unwrapping with high degree of accuracy using an appropriate model of true prior. Also, we found that the CG method realized phase unwrapping accurately by utilizing sets of unwrapped phase differences composed from second differences of the observed wave-fronts, even if aliasing occurred at several sampling points.
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FULL TEXT (PDF): 
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  • 10
75-80
  • English

REFERENCES

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