US 2022/0026564 A1 · METHOD AND DEVICE FOR PROCESSING SAR RAW DATA

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.

Claims10

Dependent claims

A method for processing synthetic aperture radar image (SAR) raw data, the method comprising:

dividing the SAR raw data into one or more sub-aperture data by a predetermined number in an azimuth direction;
performing a spectral length extension fast Fourier transform (FFT) on the divided sub-aperture data in the azimuth direction;
multiplying the divided sub-aperture data by a chirp scaling function;
performing the FFT on the divided sub-aperture data in a range direction;
performing a range compression, a secondary range compression (SRC), and a bulk range cell migration correction (RCMC) on the divided sub-aperture data;
performing an inverse chirp-z transform on the divided sub-aperture data in the range direction;
multiplying the divided sub-aperture data by a first function predetermined for residual phase correction and azimuth scaling;
performing an inverse fast Fourier transform (IFFT) on the divided sub-aperture data in the azimuth direction;
recombining the divided sub-aperture data;
multiplying the recombined data by a second function to perform deramping;
performing the FFT on the recombined data in the azimuth direction;
performing the IFFT on the recombined data in the azimuth direction;
multiplying the recombined data by a third function to perform deramping;
performing the FFT on the recombined data in the azimuth direction;
performing an azimuth compression by multiplying the recombined data by a fourth function;
performing the inverse chirp-z transform in an azimuth direction on the recombined data;
and
multiplying the recombined data by a fifth function for phase preservation.

15 more elements

A computer-readable recording medium storing a program for performing a method for processing a synthetic aperture radar image (SAR) raw data, the program comprising:

an instruction set for dividing the SAR raw data into one or more sub-aperture data by a predetermined number in an azimuth direction;
an instruction set for performing a spectral length extension fast Fourier transform (FFT) on the divided sub-aperture data in the azimuth direction;
an instruction set for multiplying the divided sub-aperture data by a chirp scaling function;
an instruction set for performing the FFT on the divided sub-aperture data in a range direction;
an instruction set for performing a range compression, a secondary range compression (SRC), and a bulk range cell migration correction (RCMC) on the divided sub-aperture data;
an instruction set for performing an inverse chirp-z transform on the divided sub-aperture data in the range direction;
an instruction set for multiplying the divided sub-aperture data by a first function predetermined for residual phase correction and azimuth scaling;
an instruction set for performing an inverse fast Fourier transform (IFFT) on the divided sub-aperture data in the azimuth direction;
an instruction set for recombining the divided sub-aperture data;
an instruction set for multiplying the recombined data by a second function to perform deramping;
an instruction set for performing the FFT on the recombined data in the azimuth direction;
an instruction set for performing the IFFT on the recombined data in the azimuth direction;
an instruction set for multiplying the recombined data by a third function to perform deramping;
an instruction set for performing the FFT on the recombined data in the azimuth direction;
an instruction set for performing an azimuth compression by multiplying the recombined data by a fourth function;
an instruction set for performing the inverse chirp-z transform in an azimuth direction on the recombined data;
and
an instruction set for multiplying the recombined data by a fifth function for phase preservation.

15 more elements

Dependencies are inferred from the claim text.

Method and device for processing sar raw data

Life of this patent

Method and device for processing sar raw data

Life of this patent

Abstract

Claims10