公开(公告)号：US11933881B2

公开(公告)日：2024-03-19

申请号：US17445661

申请日：2021-08-23

Applicant: AJOU UNIVERSITY INDUSTRY-ACADEMIC COOPERATION FOUNDATION

Inventor： Jae Hyun Kim ,  Kyeongrok Kim

IPC: G01S13/90

CPC classification number: G01S13/90

Abstract: Disclosed are a method and apparatus for processing source data of a synthetic aperture radar in a satellite, including receiving source data generated based on a signal returned after an electronic device steers a beam from a synthetic aperture radar and backscatters, setting a plurality of subswaths after the electronic device parses the source data, storing based on the plurality of subswaths after the electronic device decodes the source data; and generating image data after the electronic device calls the decoded source data in the order of the plurality of subswaths.

公开(公告)号：US11280900B2

公开(公告)日：2022-03-22

申请号：US17148689

申请日：2021-01-14

Applicant: AJOU UNIVERSITY INDUSTRY-ACADEMIC COOPERATION FOUNDATION

Inventor： Jae Hyun Kim ,  Kyeongrok Kim

IPC: G01S13/90 ,  G01S7/35

Abstract: The present invention provides an apparatus for compensating a phase error of an RF band chirp signal by pre-distorting a base band chirp signal, including: a waveform generator to output the base band chirp signal; an RF modulator to output the RF band chirp signal by upconverting the base band chirp signal; an error calculation unit to calculate a phase error over time for a predetermined time by comparing the RF band chirp signal with an ideal chirp signal; a section division unit to divide the predetermined time into a plurality of time sections; a section combination unit to combine neighboring time sections based on the phase error; and a phase distortion unit to distort phase of the base band chirp signal in the combined time sections based on the phase error.

公开(公告)号：US20210302568A1

公开(公告)日：2021-09-30

申请号：US17148689

申请日：2021-01-14

Applicant: AJOU UNIVERSITY INDUSTRY-ACADEMIC COOPERATION FOUNDATION

Inventor： Jae Hyun KIM ,  Kyeongrok Kim

IPC: G01S13/90 ,  G01S7/35

Abstract: The present invention provides an apparatus for compensating a phase error of an RF band chirp signal by pre-distorting a base band chirp signal, including: a waveform generator to output the base band chirp signal; an RF modulator to output the RF band chirp signal by upconverting the base band chirp signal; an error calculation unit to calculate a phase error over time for a predetermined time by comparing the RF band chirp signal with an ideal chirp signal; a section division unit to divide the predetermined time into a plurality of time sections; a section combination unit to combine neighboring time sections based on the phase error; and a phase distortion unit to distort phase of the base band chirp signal in the combined time sections based on the phase error.