The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 24, 2001
Filed:
Dec. 21, 1998
Josef Mittermayer, München, DE;
Alberto Moreira, Garching, DE;
Other;
Abstract
For two-dimensional processing of spotlight SAR data into exact image data, the spotlight SAR raw data are divided into azimuth sub-apertures and transformed into the range-time/azimuth-frequency domain through short azimuth FFTs. The obtained data are multiplied by a frequency-scaling function H,(f,, t,; r,) and transformed into the two-dimensional frequency domain through short range FFTs, multiplied by an RV-phase-correction function H,(f,) and subsequently transformed back into the range time/azimuth-frequency domain through short range IFFTs. The data formed in this manner are multiplied by the inverse frequency-scaling function H,(f,, f,), then transformed back into the two-dimensional frequency domain, multiplied by the phase-correction function H,(f,, f,) and the azimuth-scaling function H,(f,, f,), and transformed back into the range-frequency/azimuth-time domain through short azimuth FFTS. Then the azimuth sub-apertures are re-assembled, multiplied by a de-ramping function H,(t,) and transformed into the two-dimensional frequency domain through long azimuth FFTs.