Open AccessGeo‐location error analysis in geosynchronous SAR
Author(s) -
Zeng Tao,
Yin Wei,
Ding Zegang,
Long Teng
Publication year - 2014
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2014.2542
Subject(s) - geosynchronous orbit , doppler effect , synthetic aperture radar , remote sensing , geodesy , satellite , mode (computer interface) , computer science , range (aeronautics) , radar , geology , physics , telecommunications , aerospace engineering , engineering , astronomy , operating system
The Doppler rate of geosynchronous synthetic aperture radar (GEO SAR) is zero at some orbital positions due to their high altitude. Also, the Doppler frequency varies along the range direction in the squint mode which is widely used in GEO SAR. The above‐mentioned Doppler characteristics have serious effects on the calculation of geo‐location error, which are not considered in the conventional model. To solve the problem, an accurate model of the geo‐location error is derived based on the range‐Doppler equations and the geometry of the squint GEO SAR. The proposed model perfectly matches the simulation results, and can be widely used in both the broadside mode and the squint mode of the spaceborne SAR. Furthermore, the sensitivity of the geo‐location error to error sources is analysed based on the simulation for GEO SAR. It is found that the satellite velocity error is the main error source of the geo‐location error in GEO SAR.