The invention concerns a method for estimating the influence of Speckle on the quality of a radiometric calibration of an imaging spectrometer (10),where the spectrometer (10) is a telescope array (13),a detector (14) with multiple detector pixels (16) and a dispersive element (18),which causes a dispersion k, including, for the calibration, light, in particular sunlight, is incorporated into the spectrometer by a diffuser (12). The process involves the step of calculating a numerical contrast value CDdetector as CDdetector = 1/M, with M representing an overall degree of freedom for influencing sizes that affect the contrast measured by the detector (14), with M composed of several degrees of singleness, comprising a degree of single freedom MPolarisation, a degree of single freedom MSpectral and a degree of single freedom MPixel, where MPolarisation depends on a polarisation of light,entering the spectrometer (10), where MSSpectral depends on a spectral resolution of the spectrometer (10) and a correlation between spectral different monochromatic intensity distributions, where MPixel depends on a single pixel surface ADdetector and a correlation surface ASpeckle of a spectrometer, and where the calculation is performed for an intensity distribution obtained as a superposition of monochromatic intensities, which can be described by monochromatic fields, the circular complex Gaussian variables.
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