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- W2955726047 abstract "The dual-frequency precise point positioning (DF-PPP) technique has been widely used for time transfer. Actually, DF GNSS receivers are much more expensive than single-frequency (SF) receivers. In addition to high precision, cost is also a key issue for market applications. Furthermore, dual-frequency receivers increase the difficulty of hardware delay calibrations with respect to single frequencies. In this contribution, the SF-PPP technique is first employed for time transfer. Three SF-PPP models, namely, the ionospheric-free, ionospheric-corrected, and ionospheric-constraint SF-PPP models, are compared and assessed. With respect to the GPS-only DF-PPP solutions, the type A uncertainty of SF-PPP time transfer is at the scale of subnanoseconds, which can meet the demands of most time transfer applications. Overall, the ionospheric-constraint SF-PPP model outperforms the other two SF-PPP models. With the ionospheric-constraint SF-PPP model, the contribution of multi-GNSS observations to SF-PPP time transfer is also investigated under simulated constrained conditions with different satellite elevation cut-off angles ranging from 10° to 40°. Compared with GPS only, the reductions in the multi-GNSS combinations range from 2.3 to 16.25% at a mask angle of 20° and vary from 4.2% to 29.04% at a cut-off elevation angle of 30°." @default.
- W2955726047 created "2019-07-12" @default.
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- W2955726047 date "2019-11-01" @default.
- W2955726047 modified "2023-10-15" @default.
- W2955726047 title "Precise point positioning time transfer with multi-GNSS single-frequency observations" @default.
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- W2955726047 doi "https://doi.org/10.1016/j.measurement.2019.07.009" @default.
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