Pseudolite Constellation Optimization for Seamless Train Positioning in GNSS-Challenged Railway Stations

Liu, Jiang; Zhang, Xiaolin; Cai, Bin; Wang, Jian

doi:10.1109/tits.2021.3126167

Cited by 6 publications

(5 citation statements)

References 32 publications

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“…The visual 3D space construction is meaningful for indoor integrated navigation [42]; it is more important to allow the user to evaluate, or even perceive, the multipath in advance. The relationship between distance and near-far effects as a function of distance can be incorporated into the algorithm of integrated navigation [184], giving more weight to the navigation of other methods when encountering near-far effects and multipath.…”

Section: Pseudolites As a Spatial Reference: Discussion And Prospectsmentioning

confidence: 99%

“…The optimization of the constellation design of pseudolite positioning at railway stations was investigated [41], and an integrated train positioning system based on an integrated GNSS/pseudolite model was proposed. The performance of optimized pseudolite constellations and their impact on GNSS/pseudolite-based seamless positioning for trains was demonstrated through a case study involving a reference pseudolite constellation strategy [42]. Both studies show the importance of the placement of pseudolites at train stations or trackside.…”

Section: For Train Positioningmentioning

confidence: 99%

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Pseudolites to Support Location Services in Smart Cities: Review and Prospects

Liu,

Wang

et al. 2023

Smart Cities

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The location service is an important part of the smart city. A unified location service for outdoor and indoor/overground and underground activity will assist the construction of smart cities. However, with different coordinate systems and data formats, it is difficult to unify various positioning technologies on the same basis. Global navigation satellite system (GNSS)-based positioning is the only way to provide absolute location under the Earth-centered, Earth-fixed coordinate system (ECEF). Increasing indoor and underground human activity places significant demand on location-based services but no GNSS signals are available there. Fortunately, a type of satellite that is indoors, known as pseudolite, can transmit GNSS-like ranging signals. Users can obtain their position by receiving ranging signals and their resection without adding or switching other sensors when they go from outdoors to indoors. To complete the outreach of the GNSS indoors and underground to support the smart city, how to adapt the pseudolite design and unify coordinate frames for linking to the GNSS remain to be determined. In this regard, we provide an overview of the history of the research and application of pseudolites, the research progress from both the system side and the user side, and the plans for pseudolite-based location services in smart cities.

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Section: Pseudolites As a Spatial Reference: Discussion And Prospectsmentioning

confidence: 99%

Section: For Train Positioningmentioning

confidence: 99%

Pseudolites to Support Location Services in Smart Cities: Review and Prospects

Liu,

Wang

et al. 2023

Smart Cities

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show abstract

“…. , L − 1) in Equation (7). Moreover, the path delay τ l can be replaced by the continuous integer sample delay.…”

Section: Multipath Acquisitionmentioning

confidence: 99%

“…The integration between GNSS and INS will inherit the advantages of GNSS' long-term high precision and INS' short-term high precision at the same time [6]. The other way is with passive systems, such as pseudolite [7], and signals of opportunity (SoP) [8]. The SoP includes Wi-Fi [9,10], 4G-LTE/5G [11][12][13][14], and digital television (DTV) [15,16].…”

Section: Introductionmentioning

confidence: 99%

Carrier Phase Ranging with DTMB Signals for Urban Pedestrian Localization and GNSS Aiding

Jiao

Chen

et al. 2023

Remote Sensing

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China developed its Digital Television (DTV) standard in 2006, known as Digital Television Terrestrial Multimedia Broadcasting (DTMB), which employs time-domain synchronous orthogonal frequency division multiplexing (TDS-OFDM) as the modulation method. In contrast to Global Navigation Satellite Systems (GNSSs), DTV signals have higher transmitting power, wider coverage, larger bandwidth, and fixed transmitter location. This paper explores the positioning performance of DTMB signals, and the potential to improve GNSS positioning accuracy in urban environments. Specifically, a solution is proposed, and a software-defined radio receiver is developed for wireless localization. Without changing the current signal structure, the pseudorandom noise (PN) sequences in the signal are used for signal acquisition and carrier phase ranging. The carrier phase of the first arrived path is extracted by the least squares matching pursuit method. Both static and dynamic field tests were conducted to verify the proposed ranging and positioning method. Centimeter-level ranging accuracy was achieved in the static scenario, while meter-level ranging accuracy was achieved in the dynamic scenario. As one possible application, the proposed ranging method was combined with GPS pseudorange measurements to achieve higher accuracy position results in an urban pedestrian scenario, especially when there is only a limited number of visible satellites.

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“…This becomes a critical limitation in tunnels, train stations, bridges, and high-rise buildings where GNSS signals are easily interfered with or blocked [12]. To compensate the limitation of these methods, multi-sensor fusion combining data obtained from different sensors is used to increase the positioning accuracy, such as odometer, inertial navigation system, Lidar etc [13][14][15][16][17][18][19][20]. While these techniques have yielded significant results, they uniformly face one or several challenges: heightened system complexity, increased costs, substantial susceptibility to environmental variables, and a decline in positioning accuracy over extended periods in highly homogeneous environments like long tunnels.…”

Section: Introductionmentioning

confidence: 99%

MMW‐FC: A novel railway fastener detecting method based on millimetre wave radar for train positioning

Sun,

Li,

Yang

et al. 2024

IET Radar Sonar & Navi

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A novel method is proposed for rail fastener detection based on millimetre‐wave (mmWave) radar, mmWave radar fastener counter (MMW‐FC), which can accurately detect and record the fasteners in real‐time as the train traverses its route. Under circumstances where GNSS signals remain unavailable for prolonged durations, precise train localisation can be accomplished by correlating the number of fasteners derived from this method with the corresponding track map. Initially, MMW‐FC utilises fast Fourier transform and adaptive beamforming to focus the energy reflected from fasteners. Subsequently, it applies an adaptive template‐matching algorithm to detect each fastener. Furthermore, by leveraging known fastener spacing and the average time for trains to pass adjacent fasteners, the Kalman filter can execute precise speed tracking, used as a speed reference when adjusting the matching template adaptively. The experimental results indicate that the proposed method can precisely count the fasteners the train encounters in diverse road and speed conditions. The fastener counter maintains the Counting Error less than 0.067%, the speed error stays below 1.8 km/h, and the maximum values of the mean absolute error and root mean square error for speed are 0.7337 and 0.9584 km/h, respectively.

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Pseudolite Constellation Optimization for Seamless Train Positioning in GNSS-Challenged Railway Stations

Cited by 6 publications

References 32 publications

Pseudolites to Support Location Services in Smart Cities: Review and Prospects

Pseudolites to Support Location Services in Smart Cities: Review and Prospects

Carrier Phase Ranging with DTMB Signals for Urban Pedestrian Localization and GNSS Aiding

MMW‐FC: A novel railway fastener detecting method based on millimetre wave radar for train positioning

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