【摘要】 多源卫星影像之间的辐射一致性研究旨在消除传感器间系统性差异，实现多源遥感数据的高精度协调。文章基于多时相GF-6卫星与Sentinel-2B卫星同步影像，对GF-6卫星PMS、WFV传感器及Sentinel-2B MSI传感器的蓝、绿、红和近红外波段开展了多光谱影像反射率线性回归分析，系统探索3台传感器之间的辐射一致性及影响因素。对不同地表覆盖类型的7组同步影像进行辐射校正和几何校正处理，再基于GF-6 PMS对辐射衰减严重的GF-6 WFV影像开展交叉定标，获取地表反射率并进行一致性分析。结果显示：基于官方定标系数辐射校正后的GF-6 PMS与Sentinel-2B MSI的多光谱反射率影像具有较强的一致性（决定系数R~2>0.99，均方根误.差RMSE<0.01），进行交叉定标后的GF-6 WFV与Sentinel-2B MSI多光谱影像的辐射一致性显著增强（与交叉定标前相比，交叉定标校正后4个波段的R~2提高了0.32%～1.97%, RMSE下降27.27%～60.12%）。研究表明，辐射响应衰减是导致GF-6 WFV与Sentinel-2B MSI辐射一致性较差的主要因素，经同平台具有稳定辐射响应的PMS交叉定标后，GF-6WFV与Sentinel-2B MSI多时相影像的辐射一致性显著提升。该研究为GF-6与Sentinel-2B辐射产品的互补融合提供了借鉴与参考。更多还原

【Abstract】 .Abstract The study on inter-sensor radiometric harmonization aims to eliminate systematic differences between multi-sensor platforms, achieving high-precision fusion of multi-source remote sensing data. In this paper, synchronous multi-temporal images from the GF-6 and Sentinel-2B satellites are utilized to investigate the radiometric consistency and influencing factors among the GF-6 PMS, GF-6 WFV, and Sentinel-2B MSI sensors in the blue, green, red, and near-infrared bands. Seven pairs of synchronous images covering different land surface types are subjected to radiometric and geometric correction. Based on the GF-6 PMS sensor, crosscalibration is performed on the GF-6 WFV images, which exhibits significant radiometric degradation, to obtain surface reflectance and conduct consistency analysis. The results indicate that the radiometrically corrected GF-6PMS and Sentinel-2B MSI multispectral reflectance images show strong consistency(R2 > 0.99, RMSE < 0.01).After cross-calibration, the radiometric consistency between GF-6 WFV and Sentinel-2B MSI improved significantly, with the R2 values of the four bands increasing by 0.32%～1.97% and RMSE decreasing by27.27%～60.12% compared with those before calibration. The findings demonstrate that GF-6 PMS and Sentinel-2B MSI have stable radiometric consistency, while radiometric response degradation is the main factor contributing to the poor consistency between GF-6 WFV and Sentinel-2B MSI. After cross-calibration using the PMS sensor on the same platform, the radiometric consistency of multi-temporal GF-6 WFV and Sentinel-2B MSI images is markedly enhanced. This study provides valuable insights and references for the complementary fusion of GF-6 and Sentinel-2B radiometric products.更多还原