Please use this identifier to cite or link to this item:
http://hdl.handle.net/10397/7992
DC Field | Value | Language |
---|---|---|
dc.contributor | Department of Land Surveying and Geo-Informatics | en_US |
dc.creator | Liu, Z | en_US |
dc.creator | Yang, Z | en_US |
dc.date.accessioned | 2015-07-13T10:33:34Z | - |
dc.date.available | 2015-07-13T10:33:34Z | - |
dc.identifier.issn | 1080-5370 | en_US |
dc.identifier.uri | http://hdl.handle.net/10397/7992 | - |
dc.language.iso | en | en_US |
dc.publisher | Springer | en_US |
dc.rights | © Springer-Verlag Berlin Heidelberg 2015 | en_US |
dc.rights | This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use (https://www.springernature.com/gp/open-research/policies/accepted-manuscript-terms), but is not the Version of Record and does not reflect post acceptance improvements, or any corrections. The Version of Record is available online at: http://dx.doi.org/10.1007/s10291-015-0448-2 | en_US |
dc.subject | Anomaly and impact analysis | en_US |
dc.subject | Broadcast ionospheric coefficients | en_US |
dc.subject | Global Positioning System (GPS) | en_US |
dc.subject | Klobuchar model | en_US |
dc.subject | Vertical total electron content (VTEC) | en_US |
dc.title | Anomalies in broadcast ionospheric coefficients recorded by GPS receivers over the past two solar cycles (1992–2013) | en_US |
dc.type | Journal/Magazine Article | en_US |
dc.identifier.spage | 23 | en_US |
dc.identifier.epage | 37 | en_US |
dc.identifier.volume | 20 | en_US |
dc.identifier.doi | 10.1007/s10291-015-0448-2 | en_US |
dcterms.abstract | The anomaly phenomenon of broadcast ionospheric model coefficients of the Global Positioning System (GPS) is revealed after analyzing the navigation file data collected from all the IGS (International GNSS Service) stations worldwide over a 22-year period (1992–2013). GPS broadcast ionospheric coefficients widely used by many single-frequency users to correct the ionosphere errors for numerous GPS applications are usually believed to have only one set/version per day. However, it is found that GPS receivers from the IGS network can report as many as eight sets/versions of ionospheric coefficients in a day. In order to investigate the possible factors for such an anomalous phenomenon, the relationship between the number of coefficient sets and solar cycle, the receiver geographic locations, and receiver types/models are analyzed in detail. The results indicate that most of the coefficients show an annual variation. During the active solar cycle period from mid-1999 to mid-2001, all of the coefficients extracted from IGS navigation files behaved anomalously. Our analysis shows that the anomaly is also associated with GPS receiver types/models. Some types/models of GPS receivers report one set/version of ionospheric coefficients daily, while others report multiple sets. Our analysis also suggests that the ionospheric coefficient anomaly is not necessarily related to ionospheric scintillations. No correlation between the anomaly and geographic location of GPS receivers has been found in the analysis. Using the ionospheric coefficient data collected from 1998 to 2013, the impact of ionospheric coefficient anomaly on vertical total electron content (VTEC) calculation using the Klobuchar model has been evaluated with respect to the Global Ionospheric Maps generated by the Center for Orbit Determination in Europe. With different sets of coefficients recorded on the same day, the resulting VTEC values are dramatically different. For instance on June 1, 2000, the largest VTEC at one of our test stations can be as large as 153.3 TECu (total electron content unit) using one set of coefficients, which is 16.36 times larger than the smallest VTEC of 9.37 TECu computed from using another set of coefficients. | en_US |
dcterms.accessRights | open access | en_US |
dcterms.bibliographicCitation | GPS Solutions, Jan. 2016, v.2 0, p. 23-27 | en_US |
dcterms.isPartOf | GPS solutions | en_US |
dcterms.issued | 2016-01 | - |
dc.identifier.scopus | 2-s2.0-84923844427 | - |
dc.identifier.eissn | 1521-1886 | en_US |
dc.identifier.rosgroupid | 2014003210 | - |
dc.description.ros | 2014-2015 > Academic research: refereed > Publication in refereed journal | en_US |
dc.description.oa | Accepted Manuscript | en_US |
dc.identifier.FolderNumber | LSGI-0465 | - |
dc.description.fundingSource | RGC | en_US |
dc.description.fundingSource | Others | en_US |
dc.description.fundingText | Hong Kong Polytechnic University; National Natural Science Foundation of China; Wuhan University, GNSS Research Center | en_US |
dc.description.pubStatus | Published | en_US |
dc.identifier.OPUS | 6605633 | - |
Appears in Collections: | Journal/Magazine Article |
Files in This Item:
File | Description | Size | Format | |
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Liu_Anomalies_Broadcast_Ionospheric.pdf | Pre-Published version | 1.8 MB | Adobe PDF | View/Open |
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