BDS multi-frequency PPP ambiguity resolution with new B2a/B2b/B2a + b signals and legacy B1I/B3I signals

Li, Xin; Liu, Gege; Yuan, Yongqiang; Freeshah, Mohamed; Zhang, Keke; Zhou, Feng

doi:10.1007/s00190-020-01439-8

Cited by 52 publications

(22 citation statements)

References 35 publications

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“…Compared with the results of [20], the rate of fixed epoch and TTFF when using the traditional method in this paper increased by 4% and 10 min. The main reasons for this are the number of BDS-3 satellites and because the precision of the final products of BDS-3 increased.…”

Section: Discussionmentioning

confidence: 66%

“…where σ IF is the variance of the IF float ambiguity. It can be used to determine the weight of NL FCB by Equation (20). In order to improve the robustness and accuracy of the solution, the IGG3 method can be used for iterative calculation.…”

Section: Traditional Estimation Of Nl Fcbmentioning

confidence: 99%

“…Therefore, we used the FCB method to estimate the BDS-3 FCB in this paper. The traditional method requires several iterative calculations and takes a long time to obtain a convergent solution when estimating NL FCB [14,19,20] because the iterative condition of NL FCB is that the fixed NL ambiguities are not changed. For real-time PPP (RT-PPP), users need state-space representation (SSR).…”

Section: Introductionmentioning

confidence: 99%

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An Improved Fast Estimation of Satellite Phase Fractional Cycle Biases

Dang

et al. 2022

Remote Sensing

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Satellite phase fractional cycle biases (FCBs) are crucial to precise point positioning with ambiguity resolution (PPP–AR), and they can improve the accuracy and reliability of a solution. Traditional methods need multiple iterations and need to keep the same reference when estimating satellite phase fractional cycle biases. In this paper, we propose an improved fast estimation of FCB, which does not need any iterations and can select any reference when estimating FCB. We compare the suitability and precision of a traditional and a proposed method by BDS-3 experiments. The results of the FCB experiments show that the calculated time of the proposed method is less than the traditional method and that computation efficiency is increased by 34.71%. These two methods have a similar rate of fixed epochs and ambiguities in the static and dynamic models. However, the time to first fix (TTFF) of the proposed method decreased by 19.69% and 28.83% for the static and dynamic models, respectively. The results show that the proposed method has a better convergence time in PPP–AR.

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Section: Discussionmentioning

confidence: 66%

Section: Traditional Estimation Of Nl Fcbmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An Improved Fast Estimation of Satellite Phase Fractional Cycle Biases

Dang

et al. 2022

Remote Sensing

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“…Ref. [40] achieved 0.23 m, 0.27 m, and 0.46 m rms in the east, north, and up components, though only the BeiDou constellation was used, and only widelane and extrawidelane ambiguities were fixed. This brief literature review highlights the importance of the kinematic results in this manuscript, as narrowlane ambiguities are fixed in addition to widelane and extra-widelane, in a model that is able to process and fix dual-and triplefrequency measurements from all major GNSS constellations.…”

Section: Discussionmentioning

confidence: 99%

Approaching Global Instantaneous Precise Positioning with the Dual- and Triple-Frequency Multi-GNSS Decoupled Clock Model

Naciri

Bisnath

2021

Remote Sensing

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Precise Point Positioning (PPP), as a global precise positioning technique, suffers from relatively long convergence times, hindering its ability to be the default precise positioning technique. Reducing the PPP convergence time is a must to reach global precise positions, and doing so in a few minutes to seconds can be achieved thanks to the additional frequencies that are being broadcast by the modernized GNSS constellations. Due to discrepancies in the number of signals broadcast by each satellite/constellation, it is necessary to have a model that can process a mix of signals, depending on availability, and perform ambiguity resolution (AR), a technique that proved necessary for rapid convergence. This manuscript does so by expanding the uncombined Decoupled Clock Model to process and fix ambiguities on up to three frequencies depending on availability for GPS, Galileo, and BeiDou. GLONASS is included as well, without carrier-phase ambiguity fixing. Results show the possibility of consistent quasi-instantaneous global precise positioning through an assessment of the algorithm on a network of global stations, as the 67th percentile solution converges below 10 cm horizontal error within 2 min, compared to 8 min with a triple-frequency solution, showing the importance of having a flexible PPP-AR model frequency-wise. In terms of individual datasets, 14% of datasets converge instantaneously when mixing dual- and triple-frequency measurements, compared to just 0.1% in that of dual-frequency mode without ambiguity resolution. Two kinematic car datasets were also processed, and it was shown that instantaneous centimetre-level positioning with a moving receiver is possible. These results are promising as they only rely on ultra-rapid global satellite products, allowing for instantaneous real-time precise positioning without the need for any local infrastructure or prior knowledge of the receiver’s environment.

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“…Thanks to the remarkable advances in precise point positioning (PPP) ambiguity resolution (Collins et al., 2008; Ge et al., 2008; Laurichesse et al., 2009; X. Li, Li, et al., 2018; X. Li, Li, et al., 2020; Zumberge et al., 1997), recently, the single‐receiver carrier phase IAR approaches have been successfully developed and applied in LEO POD, which exhibit a great potential for generating high‐accuracy absolute orbit. Different from the double‐difference IAR, single receiver IAR needs to draw support from the external network‐level products, such as uncalibrated phase delay (UPD) (Ge et al., 2008), to separate the hardware biases and ambiguities.…”

Section: Introductionmentioning

confidence: 99%

Precise Orbit Determination for LEO Satellites With Ambiguity Resolution: Improvement and Comparison

Zhang

et al. 2021

JGR Solid Earth

Self Cite

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Precise knowledge of orbit represents a fundamental requirement for the earth observing satellite missions to achieve their advanced objectives. The integer ambiguity resolution (IAR) has proved to be a key to utmost accuracy in space navigation. Generally, there are two typical IAR methods widely used in the orbit determination of low Earth orbit (LEO) satellites, the classical double‐difference (DD) IAR and new single‐difference (SD) IAR. Based on one‐year observations of Gravity Recovery and Climate Experiment Follow‐On (GRACE‐FO) and Sentinel‐3 missions, this study is dedicated to a comprehensive analysis of the differences of the products used, implementation details and ambiguity fixing performance for different IAR methods in LEO precise orbit determination (POD), and discusses how these differences influence the orbit solutions. The results show that the orbit accuracy improvement contributed by the ambiguity fixing varies with the adopted IAR methods. SD IAR can contribute to a representative reduction of 1–4 mm in satellite laser ranging (SLR) residuals compared to the float solutions. The application of bias products from different analysis centers leads to marginal differences for the ambiguity fixing. For DD IAR method, the different ways to form the double‐difference ambiguity yield different performances in POD. The DD IAR of space‐ground baselines can achieve a comparable performance to SD IAR, while the benefit of ambiguity fixing is largely weakened when forming space‐space baseline. Furthermore, we also analyze the contribution of the ambiguity fixing to the accuracy and robustness of the kinematic orbit and discuss its great potential for the future applications.

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BDS multi-frequency PPP ambiguity resolution with new B2a/B2b/B2a + b signals and legacy B1I/B3I signals

Cited by 52 publications

References 35 publications

An Improved Fast Estimation of Satellite Phase Fractional Cycle Biases

An Improved Fast Estimation of Satellite Phase Fractional Cycle Biases

Approaching Global Instantaneous Precise Positioning with the Dual- and Triple-Frequency Multi-GNSS Decoupled Clock Model

Precise Orbit Determination for LEO Satellites With Ambiguity Resolution: Improvement and Comparison

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