Open AccessRadiometric calibration accuracy of airborne synthetic aperture radar in ocean surface wind field sounding
Author(s) -
Xianbin Zhao,
Kyu Yang Yi,
Wei Yan,
Weihua Ai,
Wenjun Liu
Publication year - 2012
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.61.148404
Subject(s) - depth sounding , remote sensing , synthetic aperture radar , calibration , radiometric calibration , geology , radar , environmental science , meteorology , computer science , geography , physics , oceanography , quantum mechanics , telecommunications
Sounding accuracy is difficult to study systematically and effectively because of complex airborne synthetic aperture radar system. In this paper, according to the role of radiometric calibration accuracy in ocean surface wind field sounding process of airborne synthetic aperture radar, a method is proposed to investigate the system sounding accuracy by radiometric calibration accuracy. The parameter relationship of CMOD4 geophysical model function is simulated. The radiometric calibration accuracy of airborne synthetic aperture radar ocean surface wind field sounding at different incidence angles and in wind directions is ascertained. The results show that the radiometric calibration accuracy decreases with incidence angle increasing and changes periodically with wind direction changing. The law is accordance with the change of backscattering cross-section, cased by wind speed in CMOD4 geophysical model function. According to this law, we find that the accuracy of ocean surface wind field retrieval can be improved by using active calibration scale, designing carrier aircraft crosswind flight and selecting the large incidence angle sounding imagery as retrieval area.