Precise orbit determination and point positioning using GPS, Glonass, Galileo and BeiDou

Tegedor, Javier; Øvstedal, O.; Vigen, Erik

doi:10.2478/jogs-2014-0008

Cited by 74 publications

(45 citation statements)

References 15 publications

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“…Moreover, at this point we should acknowledge several studies devoted to precise positioning including both absolute (PPP) and relative (RTK) algorithm development and performance assessment. Example of single-system and combined PPP results may be found in [19][20][21][22][23], while the application of GIOVE and IOV Galileo signals to RTK was examined in [13,24]. In [25], single-frequency RTK positioning was analysed; in [26] selected methods for GPS + Galileo signals integration were studied and assessed, while [27] was devoted to Galileo IOV + FOC.…”

Section: Introductionmentioning

confidence: 99%

On the Applicability of Galileo FOC Satellites with Incorrect Highly Eccentric Orbits: An Evaluation of Instantaneous Medium-Range Positioning

2018

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This study addresses the potential contribution of the first pair of Galileo FOC satellites sent into incorrect highly eccentric orbits for geodetic and surveying applications. We began with an analysis of the carrier to noise density ratio and the stochastic properties of GNSS measurements. The investigations revealed that the signal power of E14 & E18 satellites is higher than for regular Galileo satellites, what is related to their lower altitude over the experiment area. With regard to the noise of the observables, there are no significant differences between all Galileo satellites. Furthermore, the study confirmed that the precision of Galileo data is higher than that of GPS, especially in the case of code measurements. Next analysis considered selected domains of precise instantaneous medium-range positioning: ambiguity resolution and coordinate accuracy as well as observable residuals. On the basis of test solutions, with and without E14 & E18 data, we found that these satellites did not noticeably influence the ambiguity resolution process. The discrepancy in ambiguity success rate between test solutions did not exceed 2%. The differences between standard deviations of the fixed coordinates did not exceed 1 mm for horizontal components. The standard deviation of the L1/E1 phase residuals, corresponding to regular GPS and Galileo, and E14 & E18 satellite signals, was at a comparable level, in the range of 6.5-8.7 mm. The study revealed that the Galileo satellites with incorrect orbits were fully usable in most geodetic, surveying and many other post-processed applications and may be beneficial especially for positioning during obstructed visibility of satellites. This claim holds true when providing precise ephemeris of satellites.

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Section: Introductionmentioning

confidence: 99%

On the Applicability of Galileo FOC Satellites with Incorrect Highly Eccentric Orbits: An Evaluation of Instantaneous Medium-Range Positioning

2018

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“…Combined use of these satellite constellations can enhance the geometric strength of the GNSS positioning model, and thus has been proven beneficial for improving GNSS precise positioning performance in terms of accuracy, reliability, availability [1][2][3], and initialization time [4,5], especially for applications in obstructed environments [6][7][8]. As a commonly used precise positioning technology, real-time kinematic (RTK) positioning based on the short baselines (less than 20 km) or network reference stations has proven its efficiency and reliability during the past few years.…”

Section: Introductionmentioning

confidence: 99%

Inter-System Differencing between GPS and BDS for Medium-Baseline RTK Positioning

Gao

Pan

et al. 2017

Remote Sensing

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An inter-system differencing model between two Global Navigation Satellite Systems (GNSS) enables only one reference satellite for all observations. If the associated differential inter-system biases (DISBs) are priori known, double-differenced (DD) ambiguities between overlapping frequencies from different GNSS constellations can also be fixed to integers. This can provide more redundancies for the observation model, and thus will be beneficial to ambiguity resolution (AR) and real-time kinematic (RTK) positioning. However, for Global Positioning System (GPS) and the regional BeiDou Navigation Satellite System (BDS-2), there are no overlapping frequencies. Tight combination of GPS and BDS needs to process not only the DISBs but also the single-difference ambiguity of the reference satellite, which is caused by the influence of different frequencies. In this paper, we propose a tightly combined dual-frequency GPS and BDS RTK positioning model for medium baselines with real-time estimation of DISBs. The stability of the pseudorange and phase DISBs is analyzed firstly using several baselines with the same or different receiver types. The dual-frequency ionosphere-free model with parameterization of GPS-BDS DISBs is proposed, where the single-difference ambiguity is estimated jointly with the phase DISB parameter from epoch to epoch. The performance of combined GPS and BDS RTK positioning for medium baselines is evaluated with simulated obstructed environments. Experimental results show that with the inter-system differencing model, the accuracy and reliability of RTK positioning can be effectively improved, especially for the obstructed environments with a small number of satellites available.

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“…Note that the L GF carrier phase bias is estimated using 24-h datasets. A similar approach is used, e.g., to validate the accuracy of precise orbits of GNSS satellites (Griffiths and Ray 2009;Tegedor et al 2014). Moreover, we also present the analysis of TEC differences calculated at adjacent epochs at 23:59:30 on the first day and at 0:00:00 on the second day of a particular satellite arc.…”

Section: Accuracy Analysis Of Carrier Phase Bias Estimationmentioning

confidence: 99%

Carrier phase bias estimation of geometry-free linear combination of GNSS signals for ionospheric TEC modeling

Krypiak-Gregorczyk

Wielgosz

2018

GPS Solut

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The ionosphere can be modeled and studied using multi-frequency GNSS signals and their geometry-free linear combination. Therefore, a number of GNSS-derived ionospheric models have been developed and applied in a broad range of applications. However, due to the complexity of estimating the carrier phase ambiguities, most of these models are based on low-accuracy carrier phase smoothed pseudorange data. This, in turn, critically limits their accuracy and applicability. Therefore, we present a new methodology of estimating the phase bias of the scaled L1 and L2 carrier phase difference which is a function of the ambiguities, the ionospheric delay, and hardware delays. This methodology is suitable for ionospheric modeling at regional and continental scales. In addition, we present its evaluation under varying ionospheric conditions. The test results show that the carrier phase bias of geometry-free linear combination can be estimated with a very high accuracy, which consequently allows for calculating ionospheric TEC with the uncertainty lower than 1.0 TECU. This high accuracy makes the resulting ionosphere model suitable for improving GNSS positioning for high-precision applications in geosciences.

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Precise orbit determination and point positioning using GPS, Glonass, Galileo and BeiDou

Cited by 74 publications

References 15 publications

On the Applicability of Galileo FOC Satellites with Incorrect Highly Eccentric Orbits: An Evaluation of Instantaneous Medium-Range Positioning

On the Applicability of Galileo FOC Satellites with Incorrect Highly Eccentric Orbits: An Evaluation of Instantaneous Medium-Range Positioning

Inter-System Differencing between GPS and BDS for Medium-Baseline RTK Positioning

Carrier phase bias estimation of geometry-free linear combination of GNSS signals for ionospheric TEC modeling

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