Time transfer with BDS-3 signals: CV, PPP and IPPP

Ren, Zhiling; Gong, Hang; Lyu, Daqian; Peng, Jing; Yu, Xiao‐Qi; Sun, Guangfu

doi:10.1088/1361-6501/acaf96

Cited by 5 publications

(4 citation statements)

References 32 publications

(48 reference statements)

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“…From equation (10), it is noted that the receiver and satellite clock offsets are condensed in ∆ tk i for simplicity. All the unknown parameters in equation (10) are expressed in equation (11). Here, δd k,(B,E) j denotes the pseudorange interfrequency bias on the j th frequency, λ 1…”

Section: Ppp-ar Implementation Using Osbsmentioning

confidence: 99%

“…BDS-3 comprises satellites in three distinct orbits, namely the medium The BDS-3 multi-frequency signals, coupled with the three kinds of satellites in MEO, IGSO and GEO orbits, are increasing the research dimension in the GNSS community. In both BDS-only and multi-GNSS constellations, a considerable volume of research has followed in different fields such as multipath [2,3], signal-to-noise ratio (SNR) [4], GNSS interferometric reflectometry [5,6], quality of BDS products [7,8], precise time transfer [9,10], and ambiguity resolution (AR) [11]. While multi-frequency and multi-constellation GNSS may be applied in such broad areas, the increase in signals itself complicates the treatment of biases in the formulated observables.…”

Section: Introductionmentioning

confidence: 99%

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Enhancing BDS-3 PPP-AR with observable-specific signal biases

Galatiya Suya,

Chen,

Kwong

et al. 2023

Meas. Sci. Technol.

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In global navigation satellite system (GNSS) data processing, precise point positioning (PPP) with ambiguity resolution (PPP-AR) is a versatile technique that aims to achieve centimetre-level accuracy by resolving integer ambiguities in carrier phase observations. However, the inherent errors and biases in the satellite signals can degrade the performance of PPP-AR solutions. To mitigate such errors, this research proposed to argument PPP-AR using third-generation BeiDou Navigation Satellite System (BDS-3) multi-frequency observations and the observable-specific signal biases (OSBs) generated at the Centre National D’Etudes Spatiales (CNES). To test the proposed technique, both BDS-3 and Galileo observations from the multi-GNSS experiment network were used, in consideration that the latter also transmits multi-frequency signals. Before demonstrating the impact of CNES bias products on PPP-AR, the quality of BDS-3 and Galileo signals was assessed. The results indicated that the modernised frequencies had the best signal strength. The mean standard deviations for the estimated OSB for different receivers were close to each other in both constellations. Besides, the positioning results in different processing schemes unveiled a comparable positioning accuracy, and slightly better in the quad-PPP strategy using the Galileo constellation in both static and kinematic modes. Galileo also attained better ambiguity fixing rates and convergence time than BDS-3. Finally, there were slight differences in the magnitude of the estimated phase residuals for distinct frequency signals between BDS-3 and Galileo, including the interoperable and compatible signals.

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Section: Ppp-ar Implementation Using Osbsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhancing BDS-3 PPP-AR with observable-specific signal biases

Galatiya Suya,

Chen,

Kwong

et al. 2023

Meas. Sci. Technol.

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“…is the frequency value of a satellite system; I s,sys r,1 is the tilted path ionospheric delay for the first frequency; d sys r,i and d s,sys i denote the pseudo-range hardware delay between the receiver antenna and the signal processor and between the signal generation and the satellite antenna launch for a system frequency, respectively; b sys r,i and b s,sys i denote the phase hardware delay between the receiver antenna and the signal processor and between the signal generation and the satellite antenna launch for a system frequency; λ i is the i frequency wavelength; N s r,i is the carrier phase circumference ambiguity; e s,sys r,i and ε s,sys r,i denote the observation noise and unmodeled error for the frequency pseudo-range and carrier phase observations. IF is often used in PPP to eliminate the ionospheric first-order term, thus reducing the influence of ionospheric delay on GNSS observations, and its observation equation can be written as follows [33][34][35]:…”

Section: Mathematical Modelmentioning

confidence: 99%

Algorithms Research and Precision Comparison of Different Frequency Combinations of BDS-3\GPS\Galileo for Precise Point Positioning in Asia-Pacific Region

Gao

Cao

Meng

et al. 2023

Sensors

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With the continuous construction and development of the BeiDou navigation satellite system (BDS), its positioning performance is constantly being improved. In this study, the positioning performance of different frequency combinations of BDS-3/GPS/Galileo in the Asia-Pacific region was investigated. The precision products of Wuhan University and the observation data of nine MGEX stations were selected to compare and analyze the B1I\B1C\B2a\B3I and L1\E1 pseudo-range Standard Point Positioning (SPP) and B1IB2a\B1IB3I\B1CB2a\B1CB3I\B2aB3I\L1L2\E1E5a precise point positioning (PPP) performance, while B1I\B3I\L1 SPP and B1IB3I PPP were investigated using BDS-2 with QZSS supplemented with BDS-3 and GPS. The experimental results showed that the positioning precision of BDS-3/GPS/Galileo SPP was in the order of B1C > E1 > L1 > B1I > B3I > B2a, and it was not significantly improved after BDS-2 and QZSS were added. Moreover, for the PPP of different frequency combinations, the convergence speed was in the order of L1L2 > B1IB3I > E1E5a > B1CB3I > B1CB2a > B1IB2a > B2aB3I. After adding BDS-2, B1IB3I improved by about 11% in static mode and 27% in kinematic mode, which was similar to the L1L2 frequency combination. The positioning precision of different frequency combinations of BDS-3/GPS/Galileo was B1IB3I > B1CB3I > L1L2 > E1E5a > B1B2a > B1CB2a > B2aB3I. In static mode, after adding BDS-2, B1IB3I did not show significant improvement in the plane direction, and showed ~61% improvement in the elevation direction, and ~67% in the three-dimensional (3D) direction. In kinematic mode, after adding BDS-2, B1IB3I was improved by about 16% in the E direction, the N direction did not show significant change, it improved by ~38% in the U direction and by ~70% in the 3D direction. In general, the positioning performance of BDS-3 was slightly better than those of GPS and Galileo in the Asia-Pacific region, and it is believed that with the continuous development of BDS, its positioning performance will surely be improved further.

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“…The BDS-3 wide-area positioning performance was investigated, which demonstrated that the PPP convergence time using B1C/B2a signals was significantly shortened compared to the B1I/B3I signals [16]. The PPP time transfer was also investigated using the B1C/B2a signals, and the time links using B1C/B2a signals were shown to be more stable [17]. The BDS-3 new signals have been used in diverse precise data processing applications.…”

Section: Introductionmentioning

confidence: 99%

Real-Time Estimation of BDS-3 Satellite Clock Offset with Ambiguity Resolution Using B1C/B2a Signals

Xie,

Wang,

et al. 2024

Remote Sensing

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The third generation of the BeiDou navigation satellite system (BDS-3) can transmit five-frequency signals. The real-time satellite clock offset of BDS-3 is typically generated utilizing the B1I/B3I combination with the ambiguity-float solutions. By conducting the ambiguity resolution (AR), the reliability of the satellite clock offset can be improved. However, the performance of BDS-3 ambiguity-fixed real-time satellite clock offset with B1C/B2a signals remains unknown and unrevealed. In this contribution, the performance of the BDS-3 ambiguity-fixed satellite clock offset with the new B1C/B2a signals is investigated. One week of observation data from 85 stations was used to perform ambiguity-fixed satellite clock offset estimation. For B1I/B3I and B1C/B2a signals, the wide-lane (WL) uncalibrated phase delay (UPD) on the satellite end is fairly stable for one day, while the narrow-lane (NL) UPD standard deviation (STD) amounts to 0.122 and 0.081 cycles, respectively. The mean ambiguity fixing rate is 80.7% and 78.0% for these two signal combinations, and the time to first fix (TTFF) for the B1C/B2a signals is remarkably shorter than that of the B1I/B3I signals. The STDs of the ambiguity-float and -fixed satellite clock offsets are 0.033 and 0.026 ns, respectively, for the B1I/B3I combination, and it is reduced to 0.024 and 0.023 ns for B1C/B2a signals, respectively. Using the estimated UPD and clock offset products, the positioning performance of the kinematic Precise Point Positioning (PPP)-AR results amounts to 1.56, 1.23, and 4.46 cm in the east, north, and up directions for B1I/B3I signals, respectively. It is improved to 1.36, 1.16, and 4.25 cm using the products estimated with the B1C/B2a signals, with improvements of 12.8%, 5.7%, and 4.7% in three directions, respectively. The experiments showed that the performances of the ambiguity-fixed satellite clock offsets and the PPP-AR results using B1C/B2a signals are better than those of B1I/B3I.

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Time transfer with BDS-3 signals: CV, PPP and IPPP

Cited by 5 publications

References 32 publications

Enhancing BDS-3 PPP-AR with observable-specific signal biases

Enhancing BDS-3 PPP-AR with observable-specific signal biases

Algorithms Research and Precision Comparison of Different Frequency Combinations of BDS-3\GPS\Galileo for Precise Point Positioning in Asia-Pacific Region

Real-Time Estimation of BDS-3 Satellite Clock Offset with Ambiguity Resolution Using B1C/B2a Signals

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