【作者】 张勇； 戎志国； 闵敏；

【Author】 Zhang Yong;Rong Zhiguo;Min Min;Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites, China Meteorological Administration (LRCVES/CMA);

【机构】 中国遥感卫星辐射测量与定标重点开放实验室国家卫星气象中心；

【摘要】 利用TERRA/AQUA MODIS卫星观测数据,对中国遥感卫星辐射校正场热红外通道在轨场地辐射定标方法进行精度评估与分析。将MODIS观测的入瞳亮温与外场实测数据通过辐射传输模式模拟到卫星入瞳的亮温进行比较,可以得出结论:对于热红外窗区通道精度均优于1.0K(@300K)。因此,目前应用于我国在轨主流卫星热红外通道的场地绝对辐射定标方法本身具有很好的定标精度。然而,面向气候变化监测需要,发展可溯源、高精度、自校准的星上定标系统是未来解决红外遥感器在轨绝对辐射定标的根本途径。更多还原

【Abstract】 The accuracy of the China radiometric calibration sites(CRCS) in-orbit field absolute radiometric calibration methods(FCM) for thermal infrared channels(TIR) was evaluated and analyzed based on TERRA/AQUA MODIS observations. Comparisons between the MODIS at pupil brightness temperatures(BTs) and the simulated BTs at the top of atmosphere using radiative transfer model(RTM) based on field measurements showed that the accuracy of the current in-orbit field absolute radiometric calibration methods was better than 1.0K(@ 300K) in thermal infrared channels. Therefore, the current CRCS field calibration method for TIR channels applied to Chinese mainstream satellites was with favorable calibration accuracy. However, in order to build up a satellite climate data records with ultra-high calibration accuracy and long-term stability for satisfying the need of monitoring climate change, developing the SI traceable, high accuracy and self-correction onboard absolute calibration systems is the basic solution to solve the infrared remote sensors’ in-orbit absolute radiometric calibration in the future.更多还原