Phase unwrapping by synthetic weighted multigrid algorithm for interferometric SAR

Qingdong Hu; Shiyi Mao; Xiaoyu Li

doi:10.1117/12.357624

13 August 1999 Phase unwrapping by synthetic weighted multigrid algorithm for interferometric SAR

Qingdong Hu, Shiyi Mao, Xiaoyu Li

Proceedings Volume 3721, Algorithms for Synthetic Aperture Radar Imagery VI; (1999) https://doi.org/10.1117/12.357624
Event: AeroSense '99, 1999, Orlando, FL, United States

Abstract

First it is demonstrated in the continuous domain that least squares phase unwrapping can be expressed by Poisson equation. Therefore, solutions of the Poisson problem can be naturally employed to solve the 2D phase unwrapping. Then the error propagation in the least squares phase unwrapping is investigated by means of the Green's function due to the equivalence between the least squares and the Green's function methods. Because multigrid algorithm for solving weighted least squares equations can provide stable solutions with fast convergence, it is developed here to be a new synthetic algorithm with Branch Cut algorithm providing the weighting factors and the initial values as a change. The new synthetic algorithm combines the advantages of the Branch Cut and the Weighted Multigrid algorithm together and results on real X- SAR data of Etna mountain, Italy, finally confirm its stable and fast performance.

Citation Download Citation

Qingdong Hu, Shiyi Mao, and Xiaoyu Li "Phase unwrapping by synthetic weighted multigrid algorithm for interferometric SAR", Proc. SPIE 3721, Algorithms for Synthetic Aperture Radar Imagery VI, (13 August 1999); https://doi.org/10.1117/12.357624

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available