On-orbit radiometric calibration and Validation of GF-7 satellite based on RadCalNet Baotou site

TANG Hongzhao; TANG Xinming; XIE Junfeng; CHEN Wei; Qian Yonggang

doi:10.11834/jrs.20221692

Satellite Calibration Instances and Groud-based Validation | Views : 0 下载量: 327 CSCD: 1 更多指标

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On-orbit radiometric calibration and Validation of GF-7 satellite based on RadCalNet Baotou site
Vol. 27, Issue 5, Pages: 1194-1204(2023)
Published： 07 May 2023 ，
DOI： 10.11834/jrs.20221692

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唐洪钊，唐新明，谢俊峰，陈伟，钱永刚.2023.基于RadCalNet包头场的高分七号卫星在轨绝对辐射定标及精度验证.遥感学报，27（5）： 1194-1204

Tang H F，Tang X M，Xie J F，Chen W and Qian Y G. 2023. On-orbit radiometric calibration and validation of GF-7 satellite based on RadCalNet Baotou site. National Remote Sensing Bulletin， 27（5）：1194-1204
唐洪钊，唐新明，谢俊峰，陈伟，钱永刚.2023.基于RadCalNet包头场的高分七号卫星在轨绝对辐射定标及精度验证.遥感学报，27（5）： 1194-1204 DOI： 10.11834/jrs.20221692.

Tang H F，Tang X M，Xie J F，Chen W and Qian Y G. 2023. On-orbit radiometric calibration and validation of GF-7 satellite based on RadCalNet Baotou site. National Remote Sensing Bulletin， 27（5）：1194-1204 DOI： 10.11834/jrs.20221692.

摘要

针对2019年11月发射的首颗民用亚米级高分辨率立体测绘卫星高分七号的影像数据特点，2020年9月在内蒙古包头高分辨率遥感综合定标场开展了卫星在轨辐射定标试验。利用包头场固定辐射灰阶靶标和AERONET AOE-Baotou站点同步观测反演的大气气溶胶物理及光学特性参数，基于反射率基法对高分七号卫星传感器进行了在轨场地绝对辐射定标，获取了卫星在轨辐射定标系数，实现了传感器全动态范围内的高精度辐射定标。同时基于包头场均匀沙地的自动观测数据对辐射定标系数进行了精度验证。试验结果显示，高分七号卫星自发射以来立体测绘相机的辐射性能稳定，相机各波段影像DN值与表观辐射亮度的线性相关系数优于99%。通过误差分析可知，高分七号卫星包头场辐射定标的不确定度优于5%，获取的定标系数精确可靠，获取的辐射定标系数可用于地物参数的反演，对实现我国国产立体测绘卫星数据定量化应用、提高定量遥感科研水平都具有重要意义。

Abstract

The aim of this study is to obtain a reliable

high-precision radiometric calibration coefficient for the GF-7 satellite sensor. In this study

we describe the methods and results of a reflectance-based vicarious calibration campaign that was conducted in September 2020 at RadCalNet Baotou Site located in Inner Mongolia

China. A series of gray-scale permanent artificial targets and infrastructure have been built in the Baotou site to provide effective support for the GF-7 satellite sensor’s on-orbit calibration. The reflectance-based vicarious calibration approach relies on the synchronous measurement of surface spectral reflectance and atmospheric parameters. In this campaign

synchronous measurements of surface and atmospheric conditions (including aerosol optical depth

amount of water vapor

and aerosol inversion products) at the Baotou site at the time of the GF-7 satellite’s overhead pass are obtained with an SVC HR-1024i spectroradiometer and a Cimel CE318 sun photometer. The bidirectional reflectance distribution function (BRDF) of the surface is measured with a multi-angle instrument with an SVC spectroradiometer. The synchronous measurement of surface spectral reflectance is modified by the surface BRDF model

and the atmospheric parameters are coupled with the exoatmospheric solar irradiance spectrum. The relative spectral response of the sensor is adopted as an input for a radiative transfer model to compute the at-sensor spectral radiance. The relationship between the at-sensor radiance and the digital number (DN) recorded in the GF-7 satellite image is identified. Results show a good linear relationship between DN and the apparent radiances of each band. The uncertainty of the GF-7 sensor radiometric calibration in the RadCalNet Baotou site is 4.33%

which is less than 5%. A detailed discussion of the validation analysis of the GF-7 radiometric calibration coefficient is performed using the products from the automated RadCalNet Baotou Sand site. This study can provide a site reference for the radiometric validation of Chinese satellites. In consideration of the results shown in this paper

the data from the RadCalNet Baotou site can be used as a reference to evaluate the radiometric performance of Chinese high-resolution satellites.

关键词

遥感辐射定标表观辐亮度反射率基法包头场高分七号卫星

Keywords

remote sensingradiometric calibrationTOA radiancereflectance-based approachthe Baotou siteGF-7 satellite

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