Self-focusing method of low-frequency ultra wide band SAR (synthetic aperture radar) based on image domain

• Main Authors: LI XIANGYANG, AN DAOXIANG, LI YUELI, CHEN LEPING, XIE HONGTU, HUANG XIAOTAO, ZHOU ZHIMIN
• Format: Patent
• Language: English
• Published: 04.03.2015
• Subjects: ANALOGOUS ARRANGEMENTS USING OTHER WAVES; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES; MEASURING; PHYSICS; RADIO DIRECTION-FINDING; RADIO NAVIGATION; TESTING

The invention provides a self-focusing method of a low-frequency ultra wide band SAR (synthetic aperture radar) based on an image domain. A technical scheme adopted by the invention is that the self-focusing method comprises the following steps of: firstly, dividing an image of the low-frequency ultra wide band SAR into a plurality of sub images along the azimuth and the distance; then, processing each sub image by adopting a phase error estimating and compensating method based on three-step reconnaissance to obtain high-quality focused sub image; and finally, jointing all focused sub images by adopting a jointing method based on reference point alignment so as to obtain the self-focused image of the low-frequency ultra wide band SAR. The self-focusing method can be used for effectively improving the image quality of the low-frequency ultra wide band SAR.