DOI: 10.1002/2013JD019840
论文题名: A noise-aware combination of dual-frequency measurements from GPS radio occultation
作者: Wee T.-K. ; Kuo Y.-H.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 23 起始页码: 12852
结束页码: 12868
语种: 英语
英文关键词: Climate
; COSMIC
; GPS Radio Occultation
; ionospheric correction
; Linear combination
; Noise Aware
Scopus关键词: Blending
; Spurious signal noise
; Climate
; COSMIC
; GPS radio occultations
; Ionospheric correction
; Linear combinations
; Noise Aware
; Radio
; accuracy assessment
; COSMIC
; data set
; GPS
; noise
; remote sensing
; stratosphere
英文摘要: One of the fundamental difficulties that arise when using GPS Radio Occultation (RO) data in exploiting the stratosphere is that the air becomes rarefied with increasing height and accentuates the ionospheric effect and noise contained in the measurement. Customarily, the conventional linear combination (CLC) is used to extract neutral atmospheric components from dual-frequency (L1 and L2) RO data. The CLC combines and magnifies measurement noises, and thus works well only for those measurements of low noise. Although the L1 data are of considerably higher quality than the L2 data, the CLC does not take this into account and treats both equally; this makes the CLC-produced data less attractive. The authors propose a new approach, named Noise-Aware Combination (NAC), which is a generalized combination that factors in the presence of measurement noise. In this NAC method, the L1 and L2 data are each regarded independently, with each contributing to the combination according to its dynamically assessed accuracy. The performance of both the CLC and NAC are tested with two sets of data: one of synthetic data and the other of real data. The tests confirm that the NAC yields significant error reductions when compared to the CLC. While the noise in the CLC-produced data stands out in high altitudes and compels the data to be blended with the a priori, the NAC relies far less on this blending. The clear advantage of the NAC over the CLC would greatly enhance the value of RO for climate research. Key Points Conventional Linear Combination of dual-frequency GPS RO data is suboptimal A new generalized Noise-Aware Combination (NAC) is proposed NAC shows a significant improvement over the Conventional method ©2013. American Geophysical Union. All Rights Reserved. 资助项目: ARC-0733058
; ATM-0301213/CSA
; NNX08AN57G
; NNX12AP89G
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63127
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: University Corporation for Atmospheric Research, P. O. Box 3000, Boulder, CO 80307, United States
Recommended Citation:
Wee T.-K.,Kuo Y.-H.. A noise-aware combination of dual-frequency measurements from GPS radio occultation[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(23)