Development of the Reconstructive Transponder for In-Orbit Calibration of HY-2A Altimeter

	Development of the Reconstructive Transponder for In-Orbit Calibration of HY-2A Altimeter
	Wang, Caiyun; Guo, Wei; Zhao, Fei; Wan, Junzhi; Liu, Peng; Lin, Mingsen; Peng, Hailong; Xu, Chuan
	2016
会议名称	IEEE International Geoscience and Remote Sensing Symposium (IGARSS)
会议日期	JUL 26-31, 2015
会议地点	Milan, ITALY
关键词	Calibration frequency estimation HY-2A altimeter signal reconstructive transponder
页码	2709-2719
通讯作者	Wang, CY (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, Beijing 100190, Peoples R China.
英文摘要	China's first ocean dynamic satellite HY-2A was launched in August 2011 which carries a dual-frequency (Ku- and C-band) altimeter to measure the global mean sea level. In-orbit calibration is essential for reliably measuring sea-surface height (SSH). This paper concerns a novel approach for HY-2A altimeter in-orbit calibration using a reconstructive transponder, which is different from the existing bent-pipe transponder. The reconstructive transponder captures, tracks, and records the altimeter's pulses, then reconstructs the pulses, and transmits them back to the altimeter. It is carried on a SUV, reduces requirement for a permanent installation site, and is much more flexible and efficient. There is an internal calibration loop to enable the stability of the transponder electronics delay and the system gain. The transponder electronics delay and system gain are obtained through an overall measurement. Another benefit of the signal reconstructive transponder is to accurately estimate the altimeter clock frequency drift. HY-2A altimeter in-orbit calibration campaign started from March 2012, until now more than 70 experiments have been carried out at several sites. On March 31, 2013, HY-2A altimeter side-A failed owing to malfunction of its ultrastable oscillator (USO). And this abnormality is monitored by the transponder. From the successful experiments, HY-2A altimeter side-A and side-B instrument bias are obtained with 1- and 4-cm precisions separately. The USO frequency drifts of the HY-2A altimeter are monitored all through the calibration campaign.
收录类别	CPCI
会议主办者	IEEE
会议录	IEEE JOURNAL OF SELECTED TOPICS IN APPLIED EARTH OBSERVATIONS AND REMOTE SENSING
会议录出版者	IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
语种	英语
ISSN号	1939-1404
内容类型	会议论文
源URL	[http://ir.nssc.ac.cn/handle/122/5564]
专题	国家空间科学中心_微波遥感部
推荐引用方式 GB/T 7714	Wang, Caiyun,Guo, Wei,Zhao, Fei,et al. Development of the Reconstructive Transponder for In-Orbit Calibration of HY-2A Altimeter[C]. 见:IEEE International Geoscience and Remote Sensing Symposium (IGARSS). Milan, ITALY. JUL 26-31, 2015.