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Home > Archive>Volume 14, Issue 6, 2022 >707-714. DOI:10.13878/j.cnki.jnuist.2022.06.010
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Precision estimation of the BDS/GPS/Galileo multi-frequency observations and stochastic model refining
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P228.4

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    Abstract:

    The accuracy of stochastic model directly affects the precision and reliability of GNSS precision positioning.With 10-day observation data of CUT0,CUT2 and CUTA stations in MEGX observation network,the residuals time series of GNSS were solved by single-difference model using short baseline method.According to the statistically observed noises changing with the elevation angle,a refined stochastic model is established via the least-square method.The results show that the range of pseudo-range observation precision lies in 20-50 cm,30-50 cm and 42-63 cm for Galileo,BDS and GPS,respectively;and the carrier phase observation precision falls within the scope of 1-3 mm for Galileo and BDS,and on 3 mm for GPS.For the four frequencies of Galileo,E5 is most accurate in both pseudo-range observation and carrier phase;the accuracies of B1,B2,B3 of BDS are roughly the same;the L2 of GPS is more accurate in pseudo-range observation with precision of 42 cm than L1 of 63 cm,and both L1 and L2 have carrier phase precision of 3 mm.From the above precision estimations based on single-difference model,it can be concluded that in case of short baseline,BDS/GPS/Galileo have roughly same precision in carrier phase observation values,while Galileo E5 outperforms the other satellite systems in pseudo-range observations.Residual analysis of satellite observations provides a basis for the establishment of stochastic models in positioning.

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ZHAO Xingwang, CHEN Jian, LIU Chao, LIU Chunyang, FAN Ya. Precision estimation of the BDS/GPS/Galileo multi-frequency observations and stochastic model refining[J]. Journal of Nanjing University of Information Science & Technology,2022,14(6):707-714

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  • Received:August 02,2022
  • Online: December 14,2022
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