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• W2125220687 abstract "ABSTRACT The ionosphere is inherently associated with GPS, because the refraction it causes on space radiometric measurements is one of the main effects which have to be mitigated in order to determine reliable positions using GPS signals. The ionosphere is a dispersive medium, which means the value of the group delay or phase advance of a radio signal depends on the frequency of the signal. Consequently, GPS signals are broadcast on more than one frequency and, using receivers capable of tracking GPS signals on more than one frequency, we can mathematically eliminate the first order effect of the ionospheric refraction. If on the one hand the ionosphere impacts GPS signals, on the other hand GPS can be used as a sensor of the ionosphere. In this paper we introduce a novel approach for using GPS as an ionospheric sensor. GPS receiver networks have been used for monitoring the ionosphere for a long time, but our method was created to be suitable for single-receiver operation, as one of the outputs of enhanced precise point positioning (PPP) data processing. The package in which this new technique is implemented is called GPS Analysis and Positioning Software (GAPS), a PPP package developed at the University of New Brunswick. Another characteristic of the novel approach is that only carrier-phase measurements are used, in order to avoid the contaminating effects of pseudorange measurements, such as code multipath. The filter in which the ionospheric delays are estimated is connected to the PPP filter inside GAPS, as we will discuss in this paper. In this paper we will also explain how the ionospheric delay estimation filter work. The goal of this development was to create a procedure for ionospheric delay estimation which would be suitable for single-receiver operation, as mentioned before, and also to be suitable for either static or kinematic scenarios, and eventually real-time applications. 2849" @default.
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• W2125220687 date "2007-09-28" @default.
• W2125220687 modified "2023-09-25" @default.
• W2125220687 title "PPP-based Ionospheric Activity Monitoring" @default.
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