Method study and uncertainty analysis of calibration coefficients validation based on the Inner Mongolia test site

Calibration coefficients validation is the foundation for ascertaining the sensor performance and carrying out the quantitative application. Based on the analysis of the differences between the calibration and validation, two calibration coefficients validation methods were introduced in this paper. Taking the HJ-1A satellite CCD1 camera as an example, the uncertainties of calibration coefficients validation were analyzed. The calibration coefficients validation errors were simulated based on the measured data at an Inner Mongolia test site. The result showed that in the large view angle, the ground directional reflectance variation and the atmospheric path variation were the main error sources in calibration coefficients validation. The ground directional reflectance correction and atmospheric observation angle normalization should be carried out to improve the validation accuracy of calibration coefficients.