摘要
热定标源为星载微波辐射计提供高精度、高稳定的标准辐射亮温信号,用于微波辐射计在轨实时定标,在我国风云三号、海洋二号等气象与海洋观测卫星的微波探测载荷中得到广泛应用。热定标源物理温度与微波发射率的计量标定技术至关重要,直接关系到卫星探测的有效性和准确性。针对星载热定标源性能评价需求,围绕其关键的热特性和电磁特性,开展了计量测试技术研究,总结分析了物理温度测量与控制精度、温度不均匀度、温度稳定度以及微波发射率及频率范围等参数的现有测试方法与结果。同时根据我国遥感卫星定量化以及下一代气象卫星微波遥感载荷在轨定标需求,对更高性能星载热定标源的技术实现途径和发展趋势进行了分析与展望。
The hot calibration target provides the standard radiation brightness temperature signal with high accuracy and stability for spaceborne microwave radiometer. It can be used for the real-time calibration of the microwave radiometer on-orbit,and widely applied in the microwave detection payloads of meteorological and ocean observation satellite,such as FY-3 and HY-2. Therefore,the calibration technologies of physical temperature and microwave emissivity for hot calibration target is important,which is directly related to the validity and accuracy of satellite detection data. Focusing on the performance evaluation requirements of hot calibration target,the measurement technologies of the thermal and electromagnetic characteristics were studied. The paper summarized and analyzed the current test methods and results of the key parameters,mainly including the measurement and control precision of physical temperature,temperature non-uniformity and stability,microwave emissivity and frequency range,etc. The technical realization ways and development trends of the hot calibration target with better performance were analyzed and forecasted,according to the requirements of China’s remote sensing satellite quantification,and the on-orbit calibration of microwave remote sensing payloads of next generation meteorological satellite.
作者
高青松
李得天
陶院
景春妍
杨雷
马动涛
闫春杰
张虎忠
GAO Qingsong;LI Detian;TAO Yuan;JING Chunyan;YANG Lei;MA Dongtao;YAN Chunjie;ZHANG Huzhong(Science and Technology on Vacuum Technology and Physics Laboratory,Lanzhou Institute of Physics,Lanzhou 730000)
出处
《真空与低温》
2023年第2期103-110,共8页
Vacuum and Cryogenics
基金
甘肃省科技重大专项计划项目(22ZD6GA011)。
关键词
遥感卫星
微波辐射计
热定标源
辐射定标
温度计量
微波发射率
remote sensing satellite
microwave radiometer
hot calibration target
radiometric calibration
temperature measurement
microwave emissivity
