Airborne 3-D forward looking SAR imaging via chirp scaling algorithm

Author

Xiang, Gao ; Zhang, Xiaoling ; Shi, Jun

Author_Institution

Sch. of Electron. Eng., Univ. of Electron. Sci. & Technol. of China, Chengdu, China

fYear

2011

fDate

24-29 July 2011

Firstpage

3011

Lastpage

3014

Abstract

Because of the influence of large range walk and geometrical distortion, traditional synthetic aperture radar (SAR) imaging algorithms, such as range doppler (RD) etc., cannot be used for three demensional (3-D) forward looking SAR (F-SAR) imaging directly. In this paper, we first derive the chirp scaling algorithm (CSA) for 3-D F-SAR. Next, we analyze the geometrical distortion analytically and provide an effective approach to reconstruct the scatters to their exact positions without interpolation. Moreover, we briefly discuss the point spread function´s isosurface shape and how geometrical distortion correction (GDC) influence on it. Finally, the simulation experiments about single point and multipoint verify the algorithm´s validity.

Keywords

geophysical image processing; optical transfer function; radar imaging; remote sensing by radar; synthetic aperture radar; 3D F-SAR imaging; CSA; PSF isosurface shape; SAR imaging algorithms; airborne 3D forward looking SAR imaging; chirp scaling algorithm; geometrical distortion correction; geometrical distortion effects; large range walk effects; point spread function; synthetic aperture radar; Antennas; Chirp; Computed tomography; Image reconstruction; Radar imaging; 3-D imaging; Chirp Scaling; Forward looking; Geometrical Distortion Correction; Point Spread Function; SAR;

fLanguage

English

Publisher

ieee

Conference_Titel

Geoscience and Remote Sensing Symposium (IGARSS), 2011 IEEE International

Conference_Location

Vancouver, BC

ISSN

2153-6996

Print_ISBN

978-1-4577-1003-2

Type

conf

DOI

10.1109/IGARSS.2011.6049850

Filename

6049850