中国空间科学技术（中英文）2024，Vol.44Issue(5)：147-154,8.DOI:10.16708/j.cnki.1000-758X.2024.0082
国产C波段SAR卫星绝对辐射定标精度验证
Absolute radiometric calibration accuracy verification of domestic C-band satellite
摘要
Abstract
SAR images have strict requirements on the accuracy of radiometric calibration in the measurement of geophysical parameters and the realization of quantitative remote sensing applications.Therefore,the radiometric calibration verification of the SAR satellites is carried out.The relationship between the backscattering coefficient,the calibration constant and the image DN value is calculated with the radar equation,and the calibration verification experiment is carried out by using the active calibrator of Ningxia Zhongwei Calibration Field and its SAR image.The experimental results show that the absolute radiometric calibration accuracy of GF-3_02 satellite data is very high,in which the integration radiometric calibration accuracy is 0.65dB,while the peak calibration accuracy is 0.57dB;the radiometric calibration accuracy of the HISEA-1 satellite data is about 1-2dB.Maintaining the same wave position when calculating the calibration constant can effectively improve the stability of the calibration constant.关键词
绝对辐射定标/绝对定标常数/积分法/峰值法/波位Key words
absolute radiometric calibration/absolute calibration constant/integration method/peak value method/wave position分类
天文与地球科学引用本文复制引用
邓明军,陈志远,张过,刘宁,杨银..国产C波段SAR卫星绝对辐射定标精度验证[J].中国空间科学技术（中英文）,2024,44(5):147-154,8.基金项目
国家重点研发计划(2020YFA0713503) （2020YFA0713503）
湖南省教育厅优秀青年项目(22B0168) （22B0168）
