Title :
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
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);
Conference_Titel :
Geoscience and Remote Sensing Symposium (IGARSS), 2010 IEEE International
Conference_Location :
Honolulu, HI
Print_ISBN :
978-1-4244-9565-8
Electronic_ISBN :
2153-6996
DOI :
10.1109/IGARSS.2010.5649954
