Early Orbit Operation and Performance of DREAM on STSAT-2
- Paper number
IAC-09.B1.3.2
- Author
Dr. Sung-Hyun Kim, Gwangju Institute of Science and Technology, Korea, Republic of
- Coauthor
Mr. Namwon Moon, Gwangju Institute of Science and Technology, Korea, Republic of
- Coauthor
Mr. Sang-Hyun Lee, Satellite Technology Research Center, Korea, Republic of
- Coauthor
Dr. EunSup Sim, Korea Aerospace Research Institute, Korea, Republic of
- Coauthor
Dr. Sung-Hyun Kim, Gwangju Institute of Science and Technology, Korea, Republic of
- Coauthor
Prof. Yong-Hoon Kim, Gwangju Institute of Science and Technology, Korea, Republic of
- Coauthor
Prof. Jingshan Jiang, CSSAR/CAS, China
- Coauthor
Prof. De-Hai Zhang, CSSAR/CAS, China
- Year
2009
- Abstract
Dual-channel Radiometers for Earth and Atmosphere Monitoring (DREAM) is the Korean first spaceborne microwave radiometer which is the main payload of the Science and Technology SATellite-2 (STSAT-2). This a low earth orbit 100 Kg satellite will be launched by Korea Space Launch Vehicle-1 (KSLV-1) at NARO Space Center in Korea in Jun, 2009. The mission life time for the STSAT-2 is 2 years. The orbit is an elliptical low earth orbit with the perigee 300 km and the apogee of 1,500 km and the inclination angle is 80 °. It will orbit the earth 14 times per one day. The DREAM is a two-channel, total power microwave radiometers with the center frequencies of 23.8 GHz and 37 GHz to measure the physical parameter such as liquid water, total precipitation, sea surface temperature and so on. The bandwidths of radiometer are 600 MHz at 23.8 GHz and 1000 MHz at 37 GHz. It will also perform several scientific missions such as inter-satellite calibration, ground reference measurement, and multiple view angle measurement. In this paper, the early orbit operation and performance of DREAM on SATAT-2 will be presented. The developed radiometer was accomplished the thermal vacuum cycling test to simulate the environmental conditions to be experienced in space and the functional test to evaluate its performance. DREAM shows the following performance in ground test; the corrugated horn antenna for earth observation has more than 98 \% of main beam efficiency, the sensitivities are less than 0.20 K at both channels with 200 ms integration time, the measured linearity of two channels is larger than 0.99 and the dynamic range is 3 K to 340 K in both channels. After launch, the early orbit operation will be accomplished for about two months. To evaluate the performance of DREAM, the radiometric calibration will be executed using the reference sources. As compared with the ground test results, the early orbit performance will be explained in detail in the paper.
- Abstract document
- Manuscript document
(absent)