An on-orbit absolute radiometric calibration method for micro-nano hyperspectral satellite constellations

Abstract

This application discloses an on-orbit absolute radiometric calibration method for micro-nano hyperspectral satellite constellations, including the radiation calibration model design part of the hyperspectral satellite multi-integral series imaging design, hyperspectral data integral series normalization processing Part, the calculation part of the apparent radiance of the ground measured data that is concerned about the spectral response function of the hyperspectral satellite, and the part of the discrete point least squares optimal fitting parameter solution. It has the following advantages: the on-orbit radiation calibration model of the satellite hyperspectral sensor with considerations of different sites and different integration series is constructed, based on the global autonomous radiation calibration network (RadCalNet), using the long-term ground automatic observation data of 4 calibration fields, Through the normalization process of spatio-temporal elements, the consistency of long-sequence observation data in the time and space dimensions is realized. Based on the radiative transfer model, the absolute radiation calibration parameters are solved at discrete points, and finally the calibration results are optimized by using the least squares method.

Description

Technical field [0001] The present invention is a hyperspectral radiation calibration method, in particular for multi-integral series dynamic imaging design of multi-CMOS splicing micro-nano sensor in orbit absolute radiation calibration, proposed to meet the commercial micro-nano satellite constellation taking into account the multi-integral imaging mode and multi-CMOS splicing design of the sensor global radiation calibration network comprehensive calibration method. Background [0002] Absolute radiation calibration is the premise of quantitative inversion of hyperspectral remote sensing data, and the reliability of the data and the level of quantitative application depend largely on the accuracy and stability of the orbital radiation calibration of hyperspectral sensors. [0003] For physical spectrophoid hyperspectral satellites designed using three CMOS glyph stitching designs, such as Figure 1 As shown, each CMOS corresponds to its own gradient spectral filter, the respons...

AI Technical Summary

Problems solved by technology

At the same time, the physical spectroscopic sensor design of micro-nano hyperspectral satellite multi-CMOS splicing has differences in radiation consistency between chips, and independent calibration increases the difficulty and complexity of calibration. Micro-nano hyperspectral satellites have relatively insufficient in-orbit radiation stability. Achieving rapid periodic calibration of satellite constellations is a major challenge for commercial remote sensing services

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