The invention discloses a day and night separation vicarious calibration method for a high-definition
satellite wide-view filed imager. The method comprises steps: (1)
remote sensing image data of the high-definition
satellite wide-view filed imager in a night ocean scene are read, and offset of dark
noise in each
wave band is calculated according to the gray value generated by the dark
noise of each detection unit; (2) a
spectral radiation brightness calculation module at the
entrance pupil of the
satellite imager is determined; (3) the imager observes a specific field and imaging is carried out, auxiliary data needed by calculation of the model in the second step are synchronously observed on the ground, and the average counting value of each
wave band of the specific field is extracted according to the
remote sensing image data outputted when the imager observes the specific field; (4) the
spectral radiation brightness at the
entrance pupil of each
wave band of the satellite imager is calculated, and in combination with features of the imager wave band
spectral response function, wave band equivalent
radiation brightness at the
entrance pupil of the imager is calculated; and (5) according to the dark
noise offset in the first step, the average counting value of each wave band of the specific field in the third step and the wave band equivalent
radiation brightness at the entrance
pupil of the imager of the fifth step, the on-
orbit absolute
radiometric calibration coefficient is calculated.