太赫兹科学与电子信息学报, 2016, 14 (6): 843, 网络出版: 2017-01-23
星载辐射计接收定标系统灵敏度测试与分析
Measurement and analysis on sensitivity of receiving and calibration system of space-borne microwave radiometer
摘要
灵敏度是衡量星载微波辐射计性能好坏的重要指标, 直接影响着成像质量。为验证星载辐射计是否满足观测需求, 利用两点定标方法测试了接收及定标系统灵敏度, 分析影响接收及定标系统灵敏度的主要因素和灵敏度测试精确度。结果表明接收定标系统在 D波段F频点灵敏度优于0.86 K, 测试精确度优于 0.1 K, 可通过优化准光学馈电网络设计, 减小通道插入损耗, 进一步提高接收及系统灵敏度。
Abstract
Sensitivity is an important index to judge the performance of receiving and calibration system, which would affect the image quality of space -borne microwave radiometer directly. In order to verify whether the space-borne radiometers meet the requirements of observation or not, hot and cold calibration methods are adopted to test the receiving and calibration system sensitivity; the factors affecting sensitivity of receiving and calibration system and the measurement accuracy are analyzed. The results prove that the sensitivity of receiving and calibration system is better than0.86K, and the accuracy is higher than 0.1 K for F frequency. The system sensitivity can be improved by optimizing the design of quasi-optical feed network and minimizing channel insertion loss.
姜丽菲, 乔洋, 王芸, 孙彦龙, 姚崇斌. 星载辐射计接收定标系统灵敏度测试与分析[J]. 太赫兹科学与电子信息学报, 2016, 14(6): 843. JIANG Lifei, QIAO Yang, WANG Yun, SUN Yanlong, YAO Congbin. Measurement and analysis on sensitivity of receiving and calibration system of space-borne microwave radiometer[J]. Journal of terahertz science and electronic information technology, 2016, 14(6): 843.