Long Baseline GPS+BDS RTK Positioning with Partial Ambiguity Resolution

Brack, Andreas

doi:10.33012/2017.14915

Cited by 6 publications

(3 citation statements)

References 23 publications

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“…where d is the baseline between two receivers (km). It should be noted that the baseline should not encounter the tropospheric delay gradients or nonlinear effects in the ionosphere (Brack, ), which typically more than about 50 km.…”

Section: Methodsmentioning

confidence: 99%

Analysis of Quiet Time Vertical Ionospheric Delay Gradients Around Suvarnabhumi Airport, Thailand

2018

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Global Navigation Satellite System (GNSS) is vital to aircraft navigation at many phases of flight. To extend its use to the approach and landing phases, ground‐based augmentation system is an important on‐the‐ground technology to reduce the positioning errors. However, nonuniform spatial ionospheric delays need to be assessed during ground‐based augmentation system planning at each airport, particularly, in equatorial and low‐latitude regions. In this work, we analyze the statistics of ionospheric delay gradients around Suvarnabhumi airport, Thailand. The ionospheric delay gradients are estimated using single‐frequency code and carrier phase observation through the Kalman filter. To increase the success of the ratio test, the satellite elimination technique is then proposed. Based on the analysis between 2013 and 2016, we find that the background ionospheric delay gradients during equinox are higher than solstice, especially during September equinox 2013 when the gradients are about 9 mm/km. Moreover, the ionospheric delay gradients are more variable during daytime than nighttime.

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Section: Methodsmentioning

confidence: 99%

Analysis of Quiet Time Vertical Ionospheric Delay Gradients Around Suvarnabhumi Airport, Thailand

2018

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“…8.1.1.6], we consider 6 BSs in the simulation. We also set the interval between two consecutive measurement reports to 100 milliseconds [59]- [61], and the number of measurements used to resolve the integer ambiguity to 50 [61]. Each simulation result is the average of 2,000 independent tests upon an MS.…”

Section: Simulation Results and Analysismentioning

confidence: 99%

Carrier Phase-Based Synchronization and High-Accuracy Positioning in 5G New Radio Cellular Networks

Fan

Tian

et al. 2022

IEEE Trans. Commun.

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Inspired by excellent precision of carrier phase positioning, this paper presents a new carrier phase positioning technique for 5G new radio cellular networks with a focus on clock synchronization and integer ambiguity resolution. A carrier-phase based clock offset estimation method is first proposed to achieve precise clock synchronization among base stations, and proved to achieve the Cramér-Rao Lower Bound (CRLB) asymptotically. A fusion method is developed to fuse the estimated positions of a mobile station (MS) based on time-difference-of-arrival, with the estimated position changes based on the temporal changes of carrier phase measurements. While circumventing the integer ambiguities of the carrier phase measurements, the fusion method provides quality interim estimates of the MS positions, at which the measurements can be linearized to resolve the integer ambiguities. As a result, precise MS positions can be obtained based on the disambiguated carrier phase measurements. Numerical simulations show that the proposed carrier phase positioning can achieve a centimeterlevel accuracy in wireless cellular networks.

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“…The positioning bias, after applying the double-frequency ionospheric constraints, was more stable than that of the ionosphere-free combination; the positioning accuracy of BDS RTK reached 1-2 cm for the long baseline of about 100 km. Brack (2017) analysed the impact of partial ambiguity resolution (PAR) techniques on the positioning performance of dual-frequency single and combined GPS and BDS RTK for long baselines. Compared with the conventional full ambiguity resolution (FAR) schemes, the experimental results demonstrated that the time taken to reach centimetre-level positioning results was significantly reduced when using PAR techniques, especially for the combined system.…”

Section: Introductionmentioning

confidence: 99%

A New Method of Real-Time Kinematic Positioning Suitable for Baselines of Different Lengths

Liu

Zhang

et al. 2020

J. Navigation

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This study introduces a new real-time kinematic (RTK) positioning method which is suitable for baselines of different lengths. The method merges carrier-phase wide-lane, and ionosphere-free observation combinations (LWLC) instead of using pseudo-range, and carrier-phase ionosphere-free combination (PCLC), or single-frequency pseudo-range and phase combination (P1L1). In a first step, the double-differenced wide-lane ambiguities were calculated and fixed using the pseudo-range and carrier-phase wide-lane combination observations. Once the double-differenced wide-lane integer ambiguities were known, the wide-lane combined observations were regarded as accurate pseudo-range observations. Subsequently, the carrier-phase wide-lane, and ionosphere-free combined observations were used to fix the double-differenced carrier-phase integer ambiguities, achieving the final RTK positioning. The RTK positioning analysis was performed for short, medium, and long baselines, using the P1L1, PCLC, and LWLC methods, respectively. For a short baseline, the LWLC method demonstrated positioning accuracy similar to the P1L1 method, and performed better than the PCLC method. For medium and long baselines, the positioning accuracy of the LWLC method was slightly higher than those of the PCLC and P1L1 methods. In conclusion, the LWLC method provided high-precision RTK positioning results for baselines with different lengths, as it used high-precision carrier-phase observations with fixed ambiguities instead of low-precision pseudo-range observations.

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Long Baseline GPS+BDS RTK Positioning with Partial Ambiguity Resolution

Cited by 6 publications

References 23 publications

Analysis of Quiet Time Vertical Ionospheric Delay Gradients Around Suvarnabhumi Airport, Thailand

Analysis of Quiet Time Vertical Ionospheric Delay Gradients Around Suvarnabhumi Airport, Thailand

Carrier Phase-Based Synchronization and High-Accuracy Positioning in 5G New Radio Cellular Networks

A New Method of Real-Time Kinematic Positioning Suitable for Baselines of Different Lengths

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