NDLI: Long-Term Calibration and Accuracy Assessment of the FengYun-3 Microwave Temperature Sounder Radiance Measurements

Content Provider	IEEE Xplore Digital Library
Author	Ran You Songyan Gu Yang Guo Xuebao Wu Hu Yang Wenxin Chen
Copyright Year	1980
Abstract	The Chinese FengYun-3 (FY-3)A satellite was successfully launched on May 27, 2008, with a Microwave Temperature Sounder (MWTS) onboard. MWTS has four channels with frequencies of 50.3, 53.596, 54.94, and 57.29 GHz, respectively. The MWTS measurements are primarily used for profiling atmospheric temperatures from surface to lower stratosphere. MWTS is a cross-track scanning instrument, and its Earth-view measurements are calibrated through the warm target and cold space measurements during every scan cycle. In this paper, the FY-3A MWTS and its channel characteristics are first introduced. The calibration process and the postlaunch instrument performance are then presented, including the long-term trends of noise equivalent differential temperature (NEDT), calibration counts from cold space and warm targets, instrument telemetry, and channel gains. The observed and simulated brightness temperature (BT) differences of MWTS and Advanced Microwave Sounding Unit-A (AMSU-A) are compared. It is shown that the MWTS NEDT values at all channels are much better than its specification. The BT biases of MWTS channels 1 and 3 with respect to the simulations are similar in magnitude to those from National Oceanic and Atmospheric Administration-18 AMSU-A. The MWTS biases at channels 2 and 4 are larger than AMSU-A.
Sponsorship	IEEE Geoscience and Remote Sensing Society IEEE URSI
Starting Page	4854
Ending Page	4859
Page Count	6
File Size	1183001
File Format	PDF
ISSN	01962892
Volume Number	50
Issue Number	12
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-12-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Instruments Temperature sensors Calibration Temperature measurement Ocean temperature Satellites Accuracy Microwave Temperature Sounder (MWTS) Assessment calibration FengYun-3 (FY-3) long-term
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Electrical and Electronic Engineering

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