Stand-Alone and Hybrid Positioning Using Asynchronous Pseudolites

Gioia, Ciro; Borio, Daniele

doi:10.3390/s150100166

Cited by 18 publications

(11 citation statements)

References 11 publications

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“…It is stated that when using the pseudolites, the problem of determining the accuracy is enhanced due to possible re-reflections of radio beams and significant changes in power. The articles [7,8] show the basics of navigation measurements taking into account spatial structure of LRNS. However, the factors of the influence of geometry of spatial structure on the accuracy of navigation are not defined.…”

Section: Analysis Of Scientific Literature and The Problem Statementmentioning

confidence: 99%

The model of accuracy of a local radio navigation system considering unstable performance of individual elements

Savchenko

Vorobiov

Mykolaichuk

et al. 2016

EEJET

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ground (GPL) pseudolites, a network of control stations (CS) and a consumer segment (Fig. 1). The GPL network creates a continuous navigation field for consumers above the ground (planes, helicopters and, in fact, air pseudolites). The APL network creates similar field for ground (terrestrial) consumers. As for any navigation system, a topical issue for LRNS is a problem of the accuracy of determining the location of moving objects, and since in addition to the location determining these systems allow defining parameters of speed, then, in general, we can talk about the state vector of the consumer. The given problem acquires even greater relevance for the systems of special purpose (military, emergency services, etc.), which operate under challenging

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Section: Analysis Of Scientific Literature and The Problem Statementmentioning

confidence: 99%

The model of accuracy of a local radio navigation system considering unstable performance of individual elements

Savchenko

Vorobiov

Mykolaichuk

et al. 2016

EEJET

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“…A standalone GNSS receiver associated with an augmentation system does not meet railway safety requirements (Rispoli et al 2013). The strategy of hybridisation appears as a realistic solution in difficult environments (Gioia and Borio 2015). The hybridisation is a combination of different technologies of localisation (odometry, inertial system, etc.…”

Section: Gnss/ins Integration and Riskmentioning

confidence: 99%

Approach for evaluating the safety of a satellite-based train localisation system through the extended integrity concept

Legrand¹,

Beugin²,

Koursi³

et al. 2015

Safety and Reliability of Complex Engineered Systems

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The integrity concept, safety quality criterion for satellite-based localisation systems used in aeronautics, is described in terms of levels (protection and alert levels), time (Time To Alarm) and probability (integrity risk). In land transport applications, the requirements in terms of integrity differ from aeronautics in their definition and values. Global Navigation Satellite Systems (GNSS) in railways suffer from additional weaknesses i.e. multipath and masking phenomena, which can degrade the localisation integrity. This situation cannot be tolerated in safety-related applications like train control and signalling. To mitigate these weaknesses, GNSS is usually combined with other localisation systems like inertial sensors. However, existing integrity monitoring processes are designed for GNSS integrity evaluation, i.e. to estimate the risk allocated to the position given by the GNSS receivers only. Our research work aims, first, to extend the integrity concept to such systems, and, secondly, to demonstrate how to evaluate, with this concept, the safety of a localisation system as expected in railways. The safety of GNSS-Based Localisation System is formalised and quantitatively evaluated.

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“…In fact, in an indoor environment, the multipath effects are serious, the pseudorange accuracy is poor, and the carrier phase observations are frequently interrupted. The static multi-epoch cumulative observation is meaningless due to the invariant geometry structure of the stationary pseudolite [ 11 , 12 ], and because the linear truncation error cannot be ignored when using the conventional linear estimation method [ 13 , 14 ], making precise pseudolite positioning more challenging, especially for a low-cost pseudolite system.…”

Section: Introductionmentioning

confidence: 99%

A New Method for Single-Epoch Ambiguity Resolution with Indoor Pseudolite Positioning

Zhang

Guo

et al. 2017

Sensors

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Ambiguity resolution (AR) is crucial for high-precision indoor pseudolite positioning. Due to the existing characteristics of the pseudolite positioning system, such as the geometry structure of the stationary pseudolite which is consistently invariant, the indoor signal is easy to interrupt and the first order linear truncation error cannot be ignored, and a new AR method based on the idea of the ambiguity function method (AFM) is proposed in this paper. The proposed method is a single-epoch and nonlinear method that is especially well-suited for indoor pseudolite positioning. Considering the very low computational efficiency of conventional AFM, we adopt an improved particle swarm optimization (IPSO) algorithm to search for the best solution in the coordinate domain, and variances of a least squares adjustment is conducted to ensure the reliability of the solving ambiguity. Several experiments, including static and kinematic tests, are conducted to verify the validity of the proposed AR method. Numerical results show that the IPSO significantly improved the computational efficiency of AFM and has a more elaborate search ability compared to the conventional grid searching method. For the indoor pseudolite system, which had an initial approximate coordinate precision better than 0.2 m, the AFM exhibited good performances in both static and kinematic tests. With the corrected ambiguity gained from our proposed method, indoor pseudolite positioning can achieve centimeter-level precision using a low-cost single-frequency software receiver.

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Stand-Alone and Hybrid Positioning Using Asynchronous Pseudolites

Cited by 18 publications

References 11 publications

The model of accuracy of a local radio navigation system considering unstable performance of individual elements

The model of accuracy of a local radio navigation system considering unstable performance of individual elements

Approach for evaluating the safety of a satellite-based train localisation system through the extended integrity concept

A New Method for Single-Epoch Ambiguity Resolution with Indoor Pseudolite Positioning

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