DOI: 10.1002/2017JA024907
Scopus记录号: 2-s2.0-85041067853
论文题名: Polarization of Narrowband VLF Transmitter Signals as an Ionospheric Diagnostic
作者: Gross N.C. ; Cohen M.B. ; Said R.K. ; Gołkowski M.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 1 起始页码: 901
结束页码: 917
语种: 英语
英文关键词: ionospheric disturbances
; lightning
; polarization ellipse
; VLF remote sensing
; VLF transmitters
英文摘要: Very low frequency (VLF, 3–30 kHz) transmitter remote sensing has long been used as a simple yet useful diagnostic for the D region ionosphere (60–90 km). All it requires is a VLF radio receiver that records the amplitude and/or phase of a beacon signal as a function of time. During both ambient and disturbed conditions, the received signal can be compared to predictions from a theoretical model to infer ionospheric waveguide properties like electron density. Amplitude and phase have in most cases been analyzed each as individual data streams, often only the amplitude is used. Scattered field formulation combines amplitude and phase effectively, but does not address how to combine two magnetic field components. We present polarization ellipse analysis of VLF transmitter signals using two horizontal components of the magnetic field. The shape of the polarization ellipse is unchanged as the source phase varies, which circumvents a significant problem where VLF transmitters have an unknown source phase. A synchronized two-channel MSK demodulation algorithm is introduced to mitigate 90° ambiguity in the phase difference between the horizontal magnetic field components. Additionally, the synchronized demodulation improves phase measurements during low-SNR conditions. Using the polarization ellipse formulation, we take a new look at diurnal VLF transmitter variations, ambient conditions, and ionospheric disturbances from solar flares, lightning-ionospheric heating, and lightning-induced electron precipitation, and find differing signatures in the polarization ellipse. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114825
Appears in Collections: 气候减缓与适应
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作者单位: School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA, United States; Vaisala Inc, Louisville, CO, United States; Department of Electrical Engineering, University of Colorado Denver, Denver, CO, United States
Recommended Citation:
Gross N.C.,Cohen M.B.,Said R.K.,et al. Polarization of Narrowband VLF Transmitter Signals as an Ionospheric Diagnostic[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(1)