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The principle of self-developed hyperspectral reflectometer is introduced. The instrument has long-term automatic observation capability, and its spectral range covers the visible-short-wave infrared band. The functions of instrument include ground spectral reflectance observation, sky diffuse irradiance, total irradiance, diffuse total ratio measurement, atmospheric optical thickness measurement and long-term automatic observation. Among these the observation of the spectral reflectance of the ground is the core function of the instrument. According to the principle of ratiometric radiation measurement, the uncertainty of the reflectance measurement of the instrument depends on the uncertainty of irradiance calibration and radiance calibration. In order to verify the measurement accuracy of the instrument, the uncertainty of the instrument irradiance calibration and radiance calibration is quantitatively analyzed, and the uncertainty of the hyperspectral field reflectometer is calculated to be less than 1.74%, which meets the technical index requirements of less than 2%.
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