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• W3044892044 startingPage "108281" @default.
• W3044892044 abstract "• The triple-frequency uncombined precise orbit determination method is developed. • The hardware delay is decomposed into time-invariant and -variant components. • The ambiguity resolution method is deduced and validated. • The time-variant bias of carrier phase at the station end is analyzed. As the development of the global navigation satellite system (GNSS), the navigation satellite transmitting multi-frequency signals becomes a prevailing trend. Currently, the usual GNSS precise orbit determination (POD) strategy uses dual-frequency (DF) ionosphere-free (IF) linear combination to build up the observation equation. In the area of precise positioning, it has been validated that the third frequency can decrease the convergence time of ambiguity resolution and has a subtle improvement on the positioning accuracy. However, there is no report about the benefits of the third frequency on GNSS POD. Although the precision of dual-frequency POD can meet requirements for generating different types of products, an obvious advantage of multi-frequency observations is that more robust results can be derived. Besides, with the third frequency observations, the improvements of orbits and clocks need to be validated. Thus, a triple-frequency (TF) uncombined (UC) POD method of GNSS satellites is developed. The hardware delay of carrier phase is divided by time-invariant and -variant components. Then the UC observation model is given by re-parameterizing the unknown parameters. The datum of satellite clocks is aligned to IGS products. The step-by-step ambiguity fixing method, i.e. the extra-wide-lane, wide-lane and narrow-lane ambiguities being fixed in sequence, is deduced by using double-differenced ambiguities in a network. We select 74 ground stations and 12 GPS BLOCK IIF satellites to process POD with a length of 20 days. Results of TF-UC POD show that about 10% improvements on orbits and clocks are received compared to L1/L2 DF-IF POD. The time-variant characteristic of phase biases from satellites and stations at the third frequency is analyzed, which shows that the bias at the station has a slight influence on the derived products. These results imply that the precision of orbits and clocks can be improved with observations from the third frequency added." @default.
• W3044892044 created "2020-07-29" @default.
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• W3044892044 date "2021-02-01" @default.
• W3044892044 modified "2023-10-17" @default.
• W3044892044 title "GPS triple-frequency undifferenced and uncombined precise orbit determination with the consideration of receiver time-variant bias" @default.
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• W3044892044 doi "https://doi.org/10.1016/j.measurement.2020.108281" @default.
• W3044892044 hasPublicationYear "2021" @default.
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