Mathematical Problems in Synthetic Aperture Radar

zbMATH Open1071.65177arXiv1010.4859MaRDI QIDQ3024335

Publication date: 30 June 2005

Abstract: This thesis is concerned with problems related to Synthetic Aperture Radar (SAR). The thesis is structured as follows: The first chapter explains what SAR is, and the physical and mathematical background is illuminated. The following chapter points out a problem with a divergent integral in a common approach and proposes an improvement. Numerical comparisons are shown that indicate that the improvements allow for a superior image quality. Thereafter the problem of limited data is analyzed. In a realistic SAR-measurement the data gathered from the electromagnetic waves reflected from the surface can only be collected from a limited area. However the reconstruction formula requires data from an infinite distance. The chapter gives an analysis of the artifacts which can obscure the reconstructed images due to this problem. Additionally, some numerical examples are shown that point to the severity of the problem. In chapter 4 the fact that data is available only from a limited area is used to propose a new inversion formula. This inversion formula has the potential to make it easier to suppress artifacts due to limited data and, depending on the application, can be refined to a fast reconstruction formula. In the penultimate chapter a solution to the problem of left-right ambiguity is presented. This problem exists since the invention of SAR and is caused by the geometry of the measurements. This leads to the fact that only symmetric images can be obtained. With the solution from this chapter it is possible to reconstruct not only the even part of the reflectivity function, but also the odd part, thus making it possible to reconstruct asymmetric images. Numerical simulations are shown to demonstrate that this solution is not affected by stability problems as other approaches have been. The final chapter develops some continuative ideas that could be pursued in the future.

Full work available at URL: https://arxiv.org/abs/1010.4859

zbMATH Keywords

inverse problem Radon transform numerical examples inversion formula computerized tomography electromagnetic waves magnetic resonance imaging image reconstruction numerical comparisons synthetic aperture radar limited data optical tomography surfaces of planets transient elastography x-rays

Mathematics Subject Classification ID

Inverse problems in geophysics (86A22) Radon transform (44A12) Image processing (compression, reconstruction, etc.) in information and communication theory (94A08) Technical applications of optics and electromagnetic theory (78A55) Numerical methods for integral transforms (65R10) Planetary atmospheres (85A20) Numerical methods for inverse problems for integral equations (65R32)