A New Method of Flat-Fleid Calibration for a Pushbroom Sensor by Observing the Moon with Cross-Track Scan

In this study, we proposed a new method for flat-flied calibration of a sensor in space, which is basically difficult to conduct in space. In this method, an observation of the Moon with cross-track scan and its simulation are keys to achieve conducting the calibration. By applying the proposed method to GOSAT-2/CAI-2’s Moon observations with cross-track scan, we successfully obtained sensitivity difference among pixels in a sensor quantitatively, and it is consistent with that in a ground test before launch. In addition, by comparing results from different observations, it is possible to assess temporal variations of sensitivities in various positions in a sensor, which is a new information.