公开(公告)号：US12099114B2

公开(公告)日：2024-09-24

申请号：US17414815

申请日：2019-11-14

Applicant: KOREA AEROSPACE RESEARCH INSTITUTE

Inventor： Dong Hyun Kim

IPC: G01S13/90 ,  G06T5/10 ,  G06T7/11

CPC classification number: G01S13/9011 ,  G01S13/9054 ,  G01S13/9056 ,  G06T5/10 ,  G06T7/11 ,  G06T2207/10044 ,  G06T2207/20021 ,  G06T2207/20056

Abstract: A method according to the present invention comprises the steps of: dividing SAR raw data into one or more sub-aperture data by a predetermined number in an azimuth direction; performing a spectral length extension FFT on the sub-aperture data in the azimuth direction; multiplying the sub-aperture data by a chirp scaling function; performing a range FFT on the sub-aperture data; performing range compression, SRC, and a bulk RCMC on the sub-aperture data; performing an inverse chirp-z transform on the sub-aperture data in a range direction; multiplying the divided sub-aperture data by a predetermined first function; performing an IFFT on the sub-aperture data in the azimuth direction; recombining the sub-aperture data; multiplying the recombined data by a second function and deramping same; performing an azimuth FFT on the recombined data; performing an azimuth IFFT on the recombined data; multiplying the recombined data by a third function and deramping same; performing the azimuth FFT on the recombined data; performing azimuth compression by multiplying the recombined data by a fourth function; performing an azimuth inverse chirp-z transform on the recombined data; and multiplying the recombined data by a fifth function for phase preservation.