Mitigation of the multipath effect in BDS-based time transfer using a wave-absorbing shield

Ge, Yulong; Qin, Weijin; Yang, Huazhong; Guang, Wang; Zhou, Feng; Ouyang, Mingjun; Wang, Shengli

doi:10.1016/j.asr.2018.05.008

Cited by 10 publications

(7 citation statements)

References 21 publications

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“…It is complicated to assess the performance of precise timing due to the absence of an absolute standard for comparison. Hence, the Allan deviation (ADEV) is applied to obtain the frequency stability, as it has been applied in many studies [11,17] and is used to further evaluate the performance of precise satellite timing using the new real-time products. In our work Stable32 software (http:// www.wriley.com/) is employed to obtain the ADEV.…”

Section: Results Of Precise Timingmentioning

confidence: 99%

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A new approach to real-time precise point-positioning timing with International GNSS Service real-time service products

Ge¹,

Qin²,

Su³

et al. 2019

Meas. Sci. Technol.

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Real-time precise timing with the precise point-positioning (PPP) technique is of great interest for scientists. However, real-time precise products are not aligned to a unified time scale. Hence, real-time precise products can only be utilized for time transfer not for timing. Furthermore, if the reference time changes frequently, the receiver clock offset cannot be modelled to further improve the accuracy of timing. In this work, we present a precise satellite timing approach using International GNSS Service (IGS) real-time service products, obtaining the difference between the local time of the user and UTC(k) directly using a global navigation satellite systems (GNSS) receiver. This approach is based on three steps: (1) receiving real-time data streams and receiver observations connected to UTC(k); (2) aligning the reference time of the new precise products to UTC(k) by a PPP approach, with the new precise products then being broadcast via NTRIP (networked transport of RTCM via internet protocol); and (3) obtaining the difference between local time and UTC(k) directly using a GNSS receiver, which can be done by users anywhere on the Earth. Our numerical analyses clarify how our precise timing approach performs using IGS real-time service products. First, the standard deviation (STD) of the difference between the timing results and the receiver clock results released by the IGS final products is approximately 0.2 ns. The STD values of the difference are reduced by approximately 2.76%–25.66% using the between-epoch constraint model. Second, the frequency stability of the timing has a good consistency with the receiver clock offset from the IGS final products with regard to long-term stability, while the short-term stability of the timing with the between-epoch constraint model is better than that of IGS final products. Third, the real-time kinematic positioning accuracy obtained using the new products and CLK93 products is of a similar level when the clock offset is estimated with the white noise model. By using the new products, the positioning accuracy of the between-epoch constraint model is improved by 0.91%, 2.54% and 23.21% over the result without the clock model in three coordinate components.

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Section: Results Of Precise Timingmentioning

confidence: 99%

“…Compared with codeonly methods, PPP provides much better short-term stability, as evidenced by the low weight of the code observations and the low noise of the phase observations. With multi-GNSS development, GNSS PPP has already become a hot topic [11][12][13][14][15]. Zhang et al [16] demonstrated multi-GNSS combined PPP time transfer.…”

Section: Introductionmentioning

confidence: 99%

A new approach to real-time precise point-positioning timing with International GNSS Service real-time service products

Ge¹,

Qin²,

Su³

et al. 2019

Meas. Sci. Technol.

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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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“…[17][18][19] The modern GPS technology-based android application is a potential source to AC model, which provides the position of a requester when a certain request is submitted and direction when a user is headed. [20][21][22] This kind of fine-grained context information potential supports a location-based AC model. [23][24][25][26] To address the issues of scalability and performance, especially priorities, dynamic location, and the time-based situation (i.e., a situation like COVID-19) in the AC model, we put forward the idea of integration of the LBAC model with ARBAC [27][28][29][30][31][32][33][34][35][36][37] model along with the priority attribute.…”

Section: Introductionmentioning

confidence: 76%

“…Although the location has some marginal error, it fluctuates when the user is in motion 17‐19 . The modern GPS technology‐based android application is a potential source to AC model, which provides the position of a requester when a certain request is submitted and direction when a user is headed 20‐22 . This kind of fine‐grained context information potential supports a location‐based AC model 23‐26 …”

Section: Introductionmentioning

confidence: 99%

Real geo‐time‐based secured access computation model for e‐Health systems

Kumar

Abhishek

Chakraborty

et al. 2022

Computational Intelligence

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Mitigation of the multipath effect in BDS-based time transfer using a wave-absorbing shield

Cited by 10 publications

References 21 publications

A new approach to real-time precise point-positioning timing with International GNSS Service real-time service products

A new approach to real-time precise point-positioning timing with International GNSS Service real-time service products

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

Real geo‐time‐based secured access computation model for e‐Health systems

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