CAJ | 학술논문

为克服卫星遥感器常规定标方法不足，实现GF-1卫星PMS相机高精度在轨定标，提出了多场地宽动态辐射定标方法，分析了新方法的不确定度。首先，介绍宽动态辐射定标原理和试验场区概况，设计开展了GF-1卫星多场地同步观测试验；接着，基于试验数据和宽动态定标模型，实现了GF-1卫星PMS相机的在轨辐射定标；最后，讨论GF-1卫星PMS相机多场地定标的不确定度和模型的稳定性。结果表明：GF-1卫星PMS相机自发射以来辐射响应特性与实验室定标结果相比发生了一定变化，最大变化量达到了7.72%；PMS相机多场地辐射定标的综合不确定度为5.35%。所获取的PMS相机定标系数满足遥感辐亮度产品生产的精度要求，且多场地定标可作为后续高分卫星的在轨定标的方法参考。
위극복위성요감기상규정표방법불족，실현GF-1위성PMS상궤고정도재궤정표，제출료다장지관동태복사정표방법，분석료신방법적불학정도。수선，개소관동태복사정표원리화시험장구개황，설계개전료GF-1위성다장지동보관측시험；접착，기우시험수거화관동태정표모형，실현료GF-1위성PMS상궤적재궤복사정표；최후，토론GF-1위성PMS상궤다장지정표적불학정도화모형적은정성。결과표명：GF-1위성PMS상궤자발사이래복사향응특성여실험실정표결과상비발생료일정변화，최대변화량체도료7.72%；PMS상궤다장지복사정표적종합불학정도위5.35%。소획취적PMS상궤정표계수만족요감복량도산품생산적정도요구，차다장지정표가작위후속고분위성적재궤정표적방법삼고。
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.