物理学报2012，Vol.61Issue(14)：474-482,9.
机载合成孔径雷达海面风场探测辐射定标精度要求研究
Radiometric calibration accuracy of airborne synthetic aperture radar in ocean surface wind field sounding
摘要
Abstract
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.关键词
机载合成孔径雷达/海面风场/辐射定标精度要求/仿真模式Key words
airborne synthetic aperture radar/ocean surface wind field/radiometric calibration accuracy/simulation model分类
信息技术与安全科学引用本文复制引用
赵现斌,孔毅,严卫,艾未华,刘文俊..机载合成孔径雷达海面风场探测辐射定标精度要求研究[J].物理学报,2012,61(14):474-482,9.基金项目
国家自然科学基金 （）
中国气象局大气物理与大气环境重点开放实验基金（批准号：KDW1105）资助的课题~~ （）
