TY - JOUR
T1 - Orbit Determination Error Analysis and Compensation for Multi-static GEO SAR Imaging
AU - Liu, Yan
AU - Zhang, Wentao
AU - Chen, Zhiyang
AU - Dong, Xichao
AU - Huang, Xiaotao
AU - Chen, Leping
N1 - Publisher Copyright:
© The Institution of Engineering & Technology 2023.
PY - 2023
Y1 - 2023
N2 - The high orbit altitude of Geosynchronous Synthetic Aperture Radar (GEO SAR) introduces a significant challenge of long synthetic aperture times, which restricts the application of rapid imaging. A multi-static GEO SAR system consisting of multiple satellites flying along track can be employed to jointly image, and thus, to reduce the synthetic aperture time, but the orbit determination errors of different satellites will bring serious defocusing effect to the sub-image synthesis. In this paper, the effects of orbit determination errors on sub-image offset, defocusing and constant phase errors are analyzed in the multi-static GEO SAR system, and an orbit determination error correction method based on phase gradient autofocus (PGA) and interferometric phase estimation is proposed. Simulation results validate the effectiveness of the method.
AB - The high orbit altitude of Geosynchronous Synthetic Aperture Radar (GEO SAR) introduces a significant challenge of long synthetic aperture times, which restricts the application of rapid imaging. A multi-static GEO SAR system consisting of multiple satellites flying along track can be employed to jointly image, and thus, to reduce the synthetic aperture time, but the orbit determination errors of different satellites will bring serious defocusing effect to the sub-image synthesis. In this paper, the effects of orbit determination errors on sub-image offset, defocusing and constant phase errors are analyzed in the multi-static GEO SAR system, and an orbit determination error correction method based on phase gradient autofocus (PGA) and interferometric phase estimation is proposed. Simulation results validate the effectiveness of the method.
KW - defocusing
KW - multi-satellite joint imaging
KW - orbit determination error
KW - sub-image offset
UR - https://www.scopus.com/pages/publications/85203126806
U2 - 10.1049/icp.2024.1108
DO - 10.1049/icp.2024.1108
M3 - Conference article
AN - SCOPUS:85203126806
SN - 2732-4494
VL - 2023
SP - 373
EP - 378
JO - IET Conference Proceedings
JF - IET Conference Proceedings
IS - 47
T2 - IET International Radar Conference 2023, IRC 2023
Y2 - 3 December 2023 through 5 December 2023
ER -