Opto-mechanical System Design and Field Experimental Analysis of Hyperspectral Ratio Radiometer

At the same time, the instrument integrates real-time pre-processing and remote transmission of calibration data. In order to verify the field environment adaptability of the instrument and the reliability of the automated measurement data, an external field comparison experiment was conducted with the traditional method of manually measuring the surface reflectance and the diffuse ratio. The experimental results show that the relative deviations of the total irradiance, diffuse irradiance and direct irradiance measured by the two methods are less than 5%, and the absolute deviation of the diffuse total ratio is less than 0.025%; the overall trend of the measured reflectivity the same, and the deviation of the two is generally within ±1%, the maximum deviation is less than ± 2.5%.

The hyperspectral ratio radiometer has high automatic measurement accuracy, can replace the artificial measurement of atmospheric radiation characteristic parameters and surface reflectance, and achieve higher measurement frequency. It has broad prospects in the field of remote sensing satellite automatic calibration.