A novel three-step focusing algorithm for TOPSAR image formation

Author

Yang Wei ; Li Chunsheng ; Chen Jie ; Wang Pengbo

Author_Institution

Sch. of Electron. & Inf. Eng., Beijing Univ. of Aeronaut. & Astronaut., Beijing, China

fYear

2010

fDate

25-30 July 2010

Firstpage

4087

Lastpage

4090

Abstract

This paper conducted thorough research to the theory of space-borne TOPSAR data processing. The time-frequency characteristic of TOPSAR mode signal was analyzed and discussed in detail by mathematic derivation combined with the TOPSAR factor. Based on the analysis, an efficient and precise three-step image formation algorithm was presented for TOPSAR image formation without data division, and the operation in every step was theoretically proved effective. The de-rotation operation in the first step and deramp operation in the third step are adopted to finish the stretch in both frequency and time domains respectively, by which the azimuth folding effects in the time and frequency domains are overcome.

Keywords

radar imaging; synthetic aperture radar; time-frequency analysis; TOPSAR factor; TOPSAR image formation; TOPSAR mode signal; azimuth folding effects; derotation operation; frequency domains; mathematic derivation; space-borne TOPSAR data processing; three-step focusing; three-step image formation; time domains; time-frequency characteristics; Algorithm design and analysis; Azimuth; Bandwidth; Equations; Focusing; Time frequency analysis; Chirp Scaling; TOPSAR; azimuth de-rotation; azimuth deramp; synthetic aperture radar (SAR);

fLanguage

English

Publisher

ieee

Conference_Titel

Geoscience and Remote Sensing Symposium (IGARSS), 2010 IEEE International

Conference_Location

Honolulu, HI

ISSN

2153-6996

Print_ISBN

978-1-4244-9565-8

Electronic_ISBN

2153-6996

Type

conf

DOI

10.1109/IGARSS.2010.5649954

Filename

5649954