Instantaneous BeiDou+GPS RTK positioning with high cut-off elevation angles

Teunissen, Peter; Odolinski, Robert; Odijk, Dennis

doi:10.1007/s00190-013-0686-4

Cited by 207 publications

(116 citation statements)

References 18 publications

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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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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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“…The combination of two or more satellite systems offers more visible satellites to users, and that will enhance the satellite geometry with the expectation of improving the overall positioning solution [12,13]. A number of studies have generally shown that the contribution of combined GNSS systems improves the positional accuracy and increases the rate of fixing ambiguity resolution [14,15]. For instance, Cai and Gao [16] have indicated an improvement in the positional accuracy when combining simulated GPS and GLONASS observations as compared to GPS-only solution.…”

Section: Introductionmentioning

confidence: 99%

“…To achieve that, we carried out GNSS measurements simultaneously in the UK and in China to evaluate the enhancement of the positioning solution by using multi-GNSS constellation, in the two locations, where (i) the relatively high latitude (i.e. φ≈53°) of the UK site leads to reduced accuracy in the northern component of the GPS solution [21], and (ii) the low latitude (φ ≈29.8°) of the China site corresponds to strong constellation of the BeiDou system, due to the presence of the Mid Earth Orbiting (MEO) satellites with Inclined Geosynchronous Satellites Orbit (IGSO) and Geostationary (GEO) satellites [14]. Thus, the two sites in the UK and China are considered as representative cases to reflect the enhancement of the positioning solution by using multi-GNSS constellation.…”

Section: Introductionmentioning

confidence: 99%

Investigating multi-GNSS performance in the UK and China based on a zero-baseline measurement approach

et al. 2017

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GPS is the positioning tool of choice for a wide variety of applications where accurate (cm level or less) positions are required. However GPS is susceptible to a variety of errors that degrade both the quality of the position solution and the availability of these solutions.The contribution of additional observations from other GNSS systems may improve the quality of the positioning solution. This study investigates the contribution of the GLONASS and BeiDou systems and the potential improvement to the precision achieved compared to positioning using GPS only measurements. Furthermore, it is investigated whether the combination of the satellite systems can limit the noise level of the GPS-only solution. A series of zero-baseline measurements, of 1Hz sampling rate, were recorded with different types of pairs of receivers over 12 consecutive days in the UK and in China simultaneously.The novel part in this study is comparing the simultaneous GNSS real measurements recorded in the UK and China. Moreover, the correlation between the geometry and positional precision was investigated.The results indicate an improvement in a multi-GNSS combined solution compared to the GPS-only solution, especially when the GPS-only solution derives from weak satellite geometry, or the GPS-only solution is not available. Furthermore, all the outliers due to poor satellite coverage with the individual solutions are limited and their precision is improved, agreeing also with the improvement in the mean of the GDOP, i.e. the mean GDOP was improved from 3.0 for the GPS only solution to 1.8 for the combined solution.However, the combined positioning did not show significant positional improvement when GPS has a good geometry and availability.2

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“…The BDS code measurements using 5 GEO, 5 IGSO and 4 MEO satellites' carrier phase measurements were assessed in both static and kinematic positioning Tang 2014). Researchers have combined BDS with other satellite navigation systems in order to assess the short baseline ambiguity resolution reliability, and the availability in high cut-off elevation situation Deng et al 2013;Odolinski et al 2014;Teunissen et al 2014). Multipath delay is one of the main error sources, which is a limitation of GNSS positioning accuracies improving (Wang et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Accuracy analysis of GPS/BDS relative positioning using zero-baseline measurements

Roberts

Tang

2018

J. Glob. Position. Syst.

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This paper focuses on assessing the precision of carrier phase relative positioning using GPS-only, BDS-only and GPS/BDS measurements. A zero baseline is used in order to achieve this. Software for GPS and BDS processing has been developed, allowing static and kinematic data processing, as well as the combined GPS and BDS processing. Ionospheric and tropospheric delays are significantly reduced by double differencing between satellites and receivers, but the Multipath signals are still a major source of error for the various general GNSS baseline applications. In this paper, two Multi-GNSS receivers are connected to one antenna by an antenna splitter. This strategy results in all the delays or errors being mitigated, leaving only the random measurement noises resulted from the double difference processing. The time series of the final baseline error reveal that both GPS and BDS can achieve a precision of millimetres, but GPS performs better than BDS. Results from the combined processing of GPS and BDS demonstrate that the integration of GPS and BDS can significantly improve the precision, compared with the GPS-only and BDS-only results.

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Instantaneous BeiDou+GPS RTK positioning with high cut-off elevation angles

Cited by 207 publications

References 18 publications

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

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

Investigating multi-GNSS performance in the UK and China based on a zero-baseline measurement approach

Accuracy analysis of GPS/BDS relative positioning using zero-baseline measurements

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