Remote sensing satellite transmission calibration method based on near space aerostat platform

An optical satellite remote sensing transmission calibration method based on a near space aerostat comprises the following steps: performing space-time matching on first observation image data of a target area acquired by a radiation reference load and second observation image data of the target area acquired by a satellite load carried by a satellite to obtain a plurality of observation image data pairs; obtaining the average radiance of the radiation reference load according to a plurality of first observation image data in the plurality of observation image data pairs; according to a plurality of second observation image data in the plurality of observation image data pairs, obtaining an average pixel brightness value collected by the satellite load in the target area; according to the average radiance of the radiation reference load, obtaining the matching radiance of the radiation reference load corresponding to the observation wave band of the satellite load; and obtaining a calibration coefficient of t