NDLI: Time-frequency analysis of ionosphere scintillations observed by a GNSS receiver array

Content Provider	IEEE Xplore Digital Library
Author	Jun Wang Morton, Y. Qihou Zhou van Graas, F. Pelgrum, W.
Copyright Year	2012
Description	Author affiliation: Electrical and Computer Engineering, Miami University, Oxford, Ohio, USA (Jun Wang; Morton, Y.; Qihou Zhou) \|\| Avionics Engineering Center, Ohio University, Athens, USA (van Graas, F.; Pelgrum, W.)
Abstract	The objective of this paper is to present and compare performances of several time-frequency analysis algorithms that characterize and associate ionosphere scintillation events focusing on carrier phase measurements obtained from three relatively close spaced antennas in Alaska. The results will be used to derive plasma drift velocity and estimate the 2-dimension size of the scintillation patches. There are two challenges in detecting and associating scintillations among closely spaced receivers. First, we have to precisely estimate the start time and end time of the scintillation event captured by each receiver. Second, we have to distinguish the fluctuation caused by multipath and receiver clock from the effects of scintillation. Our approach is to analyze the time-frequency relations of GPS L1 signal observables among the receivers. Based on past experience, scintillation causes high frequency fluctuations in the range of 0.1 to 10 Hz, while multipath only introduce an extra frequency less than 1 Hz and are typically occurring at low elevations. Receiver clock errors are eliminated using differenced measurements from L1 and L2, or from a reference satellite without scintillation. Several algorithms have been studied to perform the time-frequency spectrum analysis of carrier phases: windowed Fourier transform (WFT), Morlet Wavelet transform (MWT), Hilbert-Huang transform (HHT), and an adaptive periodogram technique (APT). All four algorithms are evaluated using both simulated and real scintillation signals. Among them, APT provides the most optimal performance in terms of precision in detecting the occurrences of scintillation events in both time-domain and frequency-domain. However, APT also has a high computational cost. Morlet Wavelet transform offers complimentary performance with significantly lower computational cost. Thus, it is implemented as the level one scintillation filter before the events are finally analyzed by APT.
Starting Page	274
Ending Page	281
File Size	2227973
Page Count	8
File Format	PDF
ISBN	9781467303859
ISSN	21533598
e-ISBN	9781467303873
DOI	10.1109/PLANS.2012.6236892
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-04-23
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Time frequency analysis Global Positioning System Receivers Noise Noise measurement
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in