Absolute radiometric calibration method for satellite staring planar array CCD camera

Abstract

The invention relates to an absolute radiometric calibration method for a satellite staring planar array CCD camera. The absolute radiometric calibration method comprises the steps of firstly establishing a linear quantitative relationship between digital DN value information after relative radiometric calibration for remote sensing image data of the satellite staring planar array CCD camera and radiation energy information at entrance pupil of the satellite staring planar array CCD camera, and a radiation energy model at the entrance pupil of the satellite staring planar array CCD camera in sea imaging; then calculating to obtain radiation energy L at the entrance pupil of the satellite staring planar array CCD camera in low light level imaging of the sea area at morning or nightfall and acquire a sample average value of all probing digital DN values of the satellite staring planar array CCD camera after the relative radiometric calibration to be used as an average digital DN value DNR of the satellite staring planar array CCD camera probing units; and finally performing linear fitting on the above L and DNR and calculating to obtain an absolute radiometric calibration coefficient. The absolute radiometric calibration method overcomes the technical problem of no absolute radiometric calibration method for in-orbit operation of the satellite staring planar array CCD camera.

Description

technical field [0001] The invention relates to an absolute radiation calibration method for a staring satellite area array CCD camera, in particular to an absolute radiation calibration method for a geosynchronous orbit satellite area array camera. Background technique [0002] Staring satellites can continuously observe the phenomena in the field of view in real time and at fixed points, and can also directly customize continuous observations according to user needs. Its flexible and continuous observation methods can not only qualitatively obtain binary information about the "target area of ​​interest". Digital information can also quantitatively obtain the physical energy radiation information of the target, and the quantitative conversion process from the binary digital information of the remote sensing image data to the physical energy radiation information is called absolute radiation calibration. At present, optical satellites operating in orbit mainly adopt the on-o...

AI Technical Summary

Problems solved by technology

At present, optical satellites operating in orbit mainly adopt the on-orbit absolute radiometric calibration method based on the radiometric correction site of Dunhuang remote sensing satellite (the center coordinates are 40.09°N, 94.39°E). , in order to image the Dunhuang remote sensing satellite radiometric correction site, it is necessary to carry out oblique lateral swing. In the case of squint angle measurement, there are serious problems in using the previous on-orbit absolute radiometric calibration method, which cannot reflect the digital information and physical information scientifically and objectively. Quantitative relationship between

At the same time, due to the late start of the remote sensing application of the staring satellite area array CCD camera, so far, there is no on-orbit absolute radiometric calibration method related to this aspect in the available literature.

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