An approach for ionospheric effects reducing on SAR imaging

Author

Xia, Dongkun ; Li, Yang ; Hong, Wen ; Wu, YiRong

Author_Institution

Univ. of Sci. & Technol. of China, Hefei, China

fYear

2009

fDate

26-30 Oct. 2009

Firstpage

1072

Lastpage

1075

Abstract

For low-frequency (UHF/VHF and L band) spaceborne SAR imaging and applications, the ionospheric effects which lead to image defocusing and Faraday rotation can not be ignored. In this paper, a scheme combining Faraday rotation (FR) correction and image defocusing reduction together was presented. This scheme makes use of Faraday rotation estimated from SAR raw data to deduce the total electron content (TEC) disturbance. The soundness of this polarimetric information based technology is analysed and examined by simulations. The result shows that SAR focusing can be improved and the azimuth shift can be calibrated well.

Keywords

Faraday effect; ionospheric disturbances; radar imaging; spaceborne radar; synthetic aperture radar; Faraday rotation correction; SAR imaging; azimuth shift; image defocusing; ionospheric effects; low-frequency spaceborne SAR imaging; polarimetric information; total electron content disturbance; Delay effects; Electrons; Extraterrestrial measurements; Focusing; Frequency; Ionosphere; Microwave technology; Radar polarimetry; Space technology; Spatial resolution; Autofocus; Faraday Rotation; Ionospheric Effects Compensation; TEC Disturbance;

fLanguage

English

Publisher

ieee

Conference_Titel

Synthetic Aperture Radar, 2009. APSAR 2009. 2nd Asian-Pacific Conference on

Conference_Location

Xian, Shanxi

Print_ISBN

978-1-4244-2731-4

Electronic_ISBN

978-1-4244-2732-1

Type

conf

DOI

10.1109/APSAR.2009.5374206

Filename

5374206