Real-Time Monitoring of Regional Ionosphere Based on Polynomial Model with Multi-Station
The purpose of this paper is to monitor the ionospheric total electron content (TEC) in real time. Firstly, the receiver differential code bias (DCB) and the satellite DCB are calculated by assuming that they are constant value during the whole day. Compa
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Real-Time Monitoring of Regional Ionosphere Based on Polynomial Model with Multi-Station Wenfeng Nie, Wusheng Hu, Zhiyue Yan and Shuguo Pan
Abstract The purpose of this paper is to monitor the ionospheric total electron content (TEC) in real time. Firstly, the receiver differential code bias (DCB) and the satellite DCB are calculated by assuming that they are constant value during the whole day. Comparing with the satellite DCB given by the Center for Orbit Determination in Europe (CODE), this paper also analyzes the DCB stability of receiver and satellite. And secondly, according to the stability of DCB, we calibrate vertical TEC (VTEC) by using DCB of the former day, and establish the polynomial model with multi-station in single epoch to monitor the changes of ionosphere. The result of all epoches within a day shows that the average internal RMS of this method can be better than 1 TECU (1016 el/m2), and the average external RMS can be about 1 TECU. Keywords VTEC
Real-time monitor DCB
21.1 Introduction As a most important part of space environment, the ionosphere affects the electromagnetic waves and human activities. The ionosphere research is both complicated and meaningful. And it is not only benefited to get knowledge of the ionosphere itself, seek ways to overcome damages by ionosphere, pursue methods to serve mankind, but also to motivate the research and development of the ionosphere, which is related to the earth science field [1]. With the appearing of the W. Nie (&) W. Hu Z. Yan School of Transportation of Southeast University, Nanjing, China e-mail: [email protected] S. Pan School of Instrument Science and Engineering, Nanjing, China
J. Sun et al. (eds.), China Satellite Navigation Conference (CSNC) 2013 Proceedings, Lecture Notes in Electrical Engineering 244, DOI: 10.1007/978-3-642-37404-3_21, Ó Springer-Verlag Berlin Heidelberg 2013
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global positioning system (GPS), the monitor of the ionosphere by GPS receives widespread attention, because of the advantages of GPS: high accuracy, high reliability, huge amount of data, 24-h observation and so on [2]. In the research of ionospheric monitor, many researchers put forward different indexes to judge the level of ionospheric irregularities and scintillation. Li et al. [3] and Chen et al. [4] introduced the phase scintillation index and the amplitude scintillation index S4 that based on the power of the GPS signal. Lambert et al. [5] analyzed the ionospheric status in middle latitude of Europe region and then promoted the ionospheric I95 index which was based on the double differential residual of ionosphere. In 1996, Aarons et al. [6] put forward ROT index which means the rate of TEC, to indicate the irregularities of ionosphere. Furthermore, ROTI index, which means the standard deviation of ROT was proposed in 1997 [7]. In summarize, these indexes can’t provide the change of ionosphere in realtime according to the quantities of TEC. Aimed at the drawbacks mentioned above, Geng et al. [8] established polynomial model
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