Wide dynamic radiometric calibration of GF-1 PMS sensors using multi-test sites
摘要
In order to overcome the limitations of conventional calibration method and realize high precision in-flight radiometric calibration of GF-1 PMS sensors, a new wide dynamic radiometric calibration method using multi-test sites was presented, and the uncertainty of this method was analyzed. Firstly, the wide dynamic radiometric calibration theory was introduced and the characteristics of test sites was described. Besides, the GF-1 satellite to field synchronous observing campaign with multi test sites was designed. Secondly, based on measured data and wide dynamic calibration model, the calibration of PMS sensors was finished. Finally, the uncertainty and feasibility of this calibration algorithmic were discussed. The radiometric properties of GF-1 PMS sensors have changed comparing with the prelaunch laboratory calibrated results, and the biggest change is close to 7.72%. And the uncertainty of wide dynamic radiometric calibration of PMS sensors based on multi-test sites is 5.35%. The obtained precision of calibration coefficients meets the requirements of remote sensing radiance's retrieval, and the method provides a reference for further calibration of high resolution satellite.