Study On Thermal Infrared Remote Sensors' Absolutely Radiometric Calibrations

The Infrared Multi-Spectral Scanner (IRMSS) onboard the second China-Brazil Earth Resources Satellite (CBERS-02) is a longevous and real-time transmitting earth resource infrared multi-spectral remote sensor developed by China. It is one of the main payloads on CBERS-02 and the indispensable part for collecting the earth resources information. Since it successfully launched in October 2003, IRMSS had run normally for 2 years in orbit and transmitted a large number of the remotely sensed data to ground receiving stations. But its thermal infrared band's absolutely radiometric calibration had not been carried out yet since the sensor launched and greatly limited its thermal infrared remote sensing data's quantitative applications. So, finishing absolutely radiometric calibration of CBERS-02 IRMSS thermal channel had become an urgently important problem to be solved. Surrounding this theme, following parts of research work were developed in this paper:In the first part, many kinds of independent methods were used to do the absolutely radiometric calibration of CBERS-02 IRMSS thermal channel and obtained the calibration results from all of these methods. Analysis and comparisons were carried out among these calibration results and took the thermal data of MODIS to validation and evaluation the accuracy of these calibration indices. The research key point including:â‘ A kind of correctional method to revise the part beam path to full beam path was advanced during the onboard blackbody calibration of CBERS-02 IRMSS thermal channel. Using this correctional method when doing the onboard calibration, the calibration results could satisfy the requirements of the absolutely radiometric calibration.â‘¡ Bring forward a cross calibration method of CBERS-02 IRMSS thermal channel with the same sensor's data at different time and locations. This method could set up a good cross calibration model between IRMSS and MODIS thermal channels and obtain the more stabile calibration results.â‘¢ Based on the analysis of characteristics and results of different absolutely radiometric calibration methods, a new integrated calibration method towards the thermal infrared remote sensors was put forward. Using this new method to calibrate CBERS-02...