Positioning Accuracy of Single Frequncy GNSS PPP by CLAS Comparing with MADOCA Products

Mimura, Dai; Miyatake, Katsumasa; Kubo, Yukihiro; Sugimoto, Sueo

doi:10.5687/sss.2020.43

Cited by 5 publications

(3 citation statements)

References 2 publications

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“…Compared with our previous results in [18] and [19], the accuracy is generally improved by optimizing the ephemeris selection, removing abnormal satellites, correcting the solid earth condition, and correcting the receiver PCO.…”

Section: Resultsmentioning

confidence: 61%

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Positioning Accuracy of Single-Frequency GNSS PPP based on GR Models by using CLAS

Miyatake

Mimura

Kubo

et al. 2021

Transactions of ISCIE

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In this paper, we present the single frequency PPP algorithms based on our GR models with applying CLAS (Centimeter Level Augmentation Service) data from Japan Quasi-Zenith-Satellite-System (QZSS). Throughout the numerical experiments by using the single frequency (L1-band, only) measurement data for the static position, we have very accurate positioning results; namely the total 3D-RMS errors by applying CLAS is approximately 0.13 [m], which is the superior positioning result achieved as a single frequency GPS measurements.

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Section: Resultsmentioning

confidence: 61%

“…For reference, Table 3 reprints the RMS error of single-frequency MADOCA in [18] . Since MADOCA broadcasting data does not include ionospheric delay correction, it is necessary to estimate by some model or obtain from another data source.…”

Section: Resultsmentioning

confidence: 99%

Positioning Accuracy of Single-Frequency GNSS PPP based on GR Models by using CLAS

Miyatake

Mimura

Kubo

et al. 2021

Transactions of ISCIE

Self Cite

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“…erefore, satellite-based augmentation services were transmitted to avoid the interruptions caused by network outages, which has a wider range of service, including marine areas. Nowadays, the Quasi-Zenith Satellite System can broadcast the centimeterlevel augmentation services for Japanese users via the L6 signal [20], while the Galileo High Accuracy Service (HAS) can transmit corrections for GPS and Galileo users [21]. However, neither of them supports the BeiDou global navigation satellite system (BDS-3).…”

Section: Introductionmentioning

confidence: 99%

Modelling and Assessment of BDS-3 Real-time Precise Point Positioning Time Transfer Based on PPP-B2b Service

Tang

Lyu

Zeng

et al. 2022

Mathematical Problems in Engineering

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In 2020, users in and around China had access to a new real-time precise point positioning (RTPPP) service with the BeiDou global navigation satellite system (BDS-3) B2b (PPP-B2b) signal. In this study, the quality of PPP-B2b products is first assessed and compared with the CNAV1 broadcast ephemeris. Then a mode of BDS-3 PPP time transfer with PPP-B2b (B2b-RTPPP) is developed and evaluated in static and kinematic modes. The results demonstrate that the discontinuity of orbit is improved by applying the PPP-B2b, and its root mean square errors (RMSEs) are 0.081 m, 0.165 m, and 0.107 m in the radial, along-track, and cross-track components, respectively. The standard deviation (STD) of the PPP-B2b clock offset is 0.08 ns, greatly better than that of the broadcast clock offset. For time transfer, the type A uncertainty of the B2b-RTPPP solution is approximately 0.1 ns in static mode, and approximately 0.3 ns in kinematic mode. The B1I/B3I B2b-RTPPP time transfer solution performs better than the B1C/B2a solution. For frequency stability, the modified Allan deviation (MDEV) of the B2b-RTPPP solution is comparable to that of the post-processing solution. The B1C/B2a combination has better short-term frequency stability than B1I/B3I, while the long-term frequency stability of B1C/B2a is worse. In addition, the contribution of the differential code bias (DCB) to B2b-RTPPP time transfer is also investigated. The type A uncertainty of the B2b-RTPPP solution without DCB correction is worse than that of the B2b-RTPPP solution with DCB correction. The B1C/B2a B2b-RTPPP solution without DCB correction has better frequency stability than the B1I/B3I B2b-RTPPP solution.

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Comprehensive Analysis of PPP-B2b Service and Its Impact on BDS-3/GPS Real-Time PPP Time Transfer

et al. 2022

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2020 saw the official completion of the BDS-3 and the start of the PPP-B2b signal-based real-time precise point positioning (PPP) service to users in China and the neighboring areas. In this work, the quality of PPP-B2b products is first evaluated and compared with real-time products from the CNES and the differential code bias (DCB) from the Chinese Academy of Science (CAS). Then, a detailed performance evaluation of the PPP time transfer based on the PPP-B2b service (B2b-RTPPP) is conducted. Three solutions, namely, GPS-only (G), BDS-3-only (C), and GPS + BDS-3 (GC) B2b-RTPPP solutions, are compared and assessed. The results suggest that for the PPP-B2b products, BDS-3 satellites have better orbit and clock offset quality than GPS satellites, while the opposite is true for CNES products. The quality of the PPP-B2b orbit and clock offset is poorer than those of the CNES. The PPP-B2b DCB shows excellent agreement with the CAS DCB. The accuracy of the B2b-RTPPP solutions is sub-nanosecond level. The accuracy of B2b-RTPPP time transfer with DCB correction is approximately improved by 64% compared with that without DCB correction. The GC B2b-RTPPP solution has the greatest frequency stability, while G B2b-RTPPP solution has the poorest. Considering that the receiver may be blocked, the B2b-RTPPP time transfer performance is also evaluated at different cut-off elevation angles. As the angle increases, the B2b-RTPPP time transfer performance decreases. Additionally, the short-term frequency stability remains constant at different cut-off elevation angles, but deteriorates in the long term, especially when the angle is 40°.

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Positioning Accuracy of Single Frequncy GNSS PPP by CLAS Comparing with MADOCA Products

Cited by 5 publications

References 2 publications

Positioning Accuracy of Single-Frequency GNSS PPP based on GR Models by using CLAS

Positioning Accuracy of Single-Frequency GNSS PPP based on GR Models by using CLAS

Modelling and Assessment of BDS-3 Real-time Precise Point Positioning Time Transfer Based on PPP-B2b Service

Comprehensive Analysis of PPP-B2b Service and Its Impact on BDS-3/GPS Real-Time PPP Time Transfer

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