韩国科学技术卫星二号主载荷——双频微波辐射计

Korean STSAT-2 Main Payload——Dual-channel Microwave Radiometer

双频微波辐射计是韩国科学技术卫星二号的主载荷,目前已完成了正样研制并交付韩国。双频微波辐射计是全功率形式的微波辐射计,星上采用两点定标方式。由于受卫星平台的限制,天线不能做得很大并进行扫描,因此选择了接收机定标的方案,即定标支路和观测支路采用了不同的天线,通过多路开关与接收机连接。系统及验收测试表明,双频微波辐射计满足韩方的各项功能和性能指标要求。介绍了韩国科学技术卫星二号的基本情况以及双频微波辐射计的设计方案。给出了主要指标和系统试验结果。

Dual-channel Radiometers for Earth and Atmosphere Monitoring （DREAM） is main payloard of Korean science and technology satellite 2 （STSAT-2）. The flying modes of DREAM have been developed and delivered to Korea. DREAM is a full power radiometer. When DREAM is in orbit, it will calibrate with matched load and space radiation. DREAM antennas are small and do not scan because of restriction of the satellite. Receiver calibration method is adopted by DREAM. In the method, different antennas are used in calibration and measurement channel respectively and are connected with receiver by a TPST switch. System and acceptance test results show that DREAM meets Korean requirements 6f functions and performances. In the paper, STSAT 2 and the design of DREAM are introduced. DREAM main performances and system test results are presented.