BDS relative static positioning over long baseline improved by GEO multipath mitigation

Wang, Min; Chai, Hongzhou; Liu, Jun; Zeng, Anmin

doi:10.1016/j.asr.2015.11.032

Cited by 15 publications

(12 citation statements)

References 29 publications

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“…The unique constellation design of BeiDou (GEO + IGSO + MEO) makes it more difficult to mitigate multipath effects compared to GPS (MEO only). The multipath issue of BeiDou signals has been intensively investigated recently [63][64][65][66][67][68]. It is expected that the algorithms for modeling multipath effects on BeiDou observations will be improved in the near future.…”

Section: Appl Sci 2019 9 X For Peer Reviewmentioning

confidence: 99%

Detection and Monitoring of Tunneling-Induced Riverbed Deformation Using GPS and BeiDou: A Case Study

et al. 2019

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Shield tunneling under rivers often requires monitoring riverbed deformations in near real-time. However, it is challenging to measure riverbed deformation with conventional survey techniques. This study introduces a comprehensive method that uses the Global Positioning System (GPS) of the USA and the BeiDou navigation satellite system (BeiDou) of China to monitor riverbed deformation during the construction of twin tunnels beneath the Hutuo River in Shijiazhuang, China. A semi-permanent GPS network with one base station outside the river and six rover stations within the river was established for conducting near real-time and long-term monitoring. The distances between the base and the rover antennas are within two kilometers. The network was continuously operating for eight months from April to December 2018. The method is comprised of three components: (1) Monitoring the stability of the base station using precise point positioning (PPP) method, a stable regional reference frame, and a seasonal ground deformation model; (2) monitoring the relative positions of rover stations using the carrier-phase double-difference (DD) positioning method in near real-time; and (3) detecting abrupt and gradual displacements at both base and rover stations using an automated change point detection algorithm. The method is able to detect abrupt positional-changes as minor as five millimeters in near real-time and gradual positional-changes at a couple of millimeters per day within a week. The method has the flexibility of concurrent processing different GPS and BeiDou data sessions (e.g., every 15 minutes, 30 minutes, one hour, one day) for diffident monitoring purposes. This study indicates that BeiDou observations can also achieve few-millimeter-accuracy for measuring displacements. Parallel processing GPS and BeiDou observations can improve the reliability of near real-time structural deformation monitoring and minimize false alerts. The method introduced in this article can be applied to other urban areas for near real-time and long-term structural health monitoring.

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Section: Appl Sci 2019 9 X For Peer Reviewmentioning

confidence: 99%

Detection and Monitoring of Tunneling-Induced Riverbed Deformation Using GPS and BeiDou: A Case Study

et al. 2019

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“…Note also that the Geostationary Orbit (GEO) C03 BDS satellite had to be excluded from all the results as it yielded many incorrectly fixed instances caused by low-elevation multipath (Wang et al 2015a;2015b), due to it being almost stationary and having a low elevation angle of around 12 ∘ with respect to the receivers (Odolinski and Teunissen 2016).…”

Section: Experiments Setupmentioning

confidence: 99%

Low-cost, high-precision, single-frequency GPS–BDS RTK positioning

Odolinski

Teunissen

2017

GPS Solut

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The integration of the Chinese BDS with other systems, such as the American GPS, makes precise RTK positioning possible with low-cost receivers. We investigate the performance of low-cost ublox receivers, which cost a few hundred USDs, while making use of L1 GPS + B1 BDS data in Dunedin, New Zealand. Comparisons will be made to L1 + L2 GPS and survey-grade receivers which cost several thousand USDs. The least-squares variance component estimation (LS-VCE) procedure is used to determine the code and phase variances and covariances of the receivers and thus formulate a realistic stochastic model. Otherwise the ambiguity resolution and hence positioning performance would deteriorate. For the same reasons, the existence of receiverinduced time-correlation is also investigated. The low-cost RTK performance is then evaluated by formal and empirical ambiguity success-rates and positioning precisions. It will be shown that the code and phase precision of the low-cost receivers can be significantly improved by using surveygrade antennas, since they have better signal reception and multipath suppression abilities in comparison to low-cost patch antennas. It will also be demonstrated that the low-cost receivers can achieve competitive ambiguity resolution and positioning performance to survey-grade dualfrequency GPS receivers.

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“…One can easily choose the subset of WL integer ambiguities to recover the integer property of narrow-lane (NL) ambiguity in the subsequent step since the MW combination is implemented for each satellite pair. This is particularly important for BDS due to the existence of satellite-induced code bias and the systematic multipath effects in GEO satellites [24,25]. The other model is to parameterize the slant ionospheric delay for each satellite (pair), which is also called the uncombined model.…”

Section: Intra-system and Inter-system Observation Modelmentioning

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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BDS relative static positioning over long baseline improved by GEO multipath mitigation

Cited by 15 publications

References 29 publications

Detection and Monitoring of Tunneling-Induced Riverbed Deformation Using GPS and BeiDou: A Case Study

Detection and Monitoring of Tunneling-Induced Riverbed Deformation Using GPS and BeiDou: A Case Study

Low-cost, high-precision, single-frequency GPS–BDS RTK positioning

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

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