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Open AccessArticle

Retrieval of Three-Dimensional Surface Deformation Using an Improved Differential SAR Tomography System

School of Electronics and Information Engineering, Harbin Institute of Technology, Harbin 150001, China
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Electronics 2019, 8(2), 174; https://doi.org/10.3390/electronics8020174
Received: 13 December 2018 / Revised: 27 January 2019 / Accepted: 31 January 2019 / Published: 2 February 2019
Conventional differential synthetic aperture radar tomography (D-TomoSAR) can only capture the scatterers’ one-dimensional (1-D) deformation information along the line of sight (LOS) of the synthetic aperture radar (SAR), which means that it cannot retrieve the three-dimensional (3-D) movements of the ground surface. To retrieve the 3-D deformation displacements, several methods have been proposed; the performance is limited due to the insufficient sensitivity for retrieving the North-South motion component. In this paper, an improved D-TomoSAR model is established by introducing the scatterers’ 3-D deformation parameters in slant range, azimuth, and elevation directions into the traditional D-TomoSAR model. The improved D-TomoSAR can be regarded as a multi-component two-dimensional (2-D) polynomial phase signal (PPS). Then, an effective algorithm is proposed to retrieve the 3-D deformation parameters of the ground surface by the 2-D product high-order ambiguity function (PHAF) with the relax (RELAX) algorithm. The estimation performance is investigated and compared with the traditional algorithm. Simulations and experimental results with semi-real data verify the effectiveness of the proposed signal model and algorithm. View Full-Text
Keywords: synthetic aperture radar; differential SAR tomography; squinted SAR; 3-D deformation; 2-D PPS synthetic aperture radar; differential SAR tomography; squinted SAR; 3-D deformation; 2-D PPS
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Wang, Z.; Liu, M.; Lv, K. Retrieval of Three-Dimensional Surface Deformation Using an Improved Differential SAR Tomography System. Electronics 2019, 8, 174.

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