Deploying a Locata network to enable precise positioning in urban canyons

Montillet, Jean-Philippe; Roberts, Gethin Wyn; Hancock, Craig M.; Meng, Xiaolin; Ogundipe, Oluwatomisin; Barnes, Joel

doi:10.1007/s00190-008-0236-7

Cited by 49 publications

(22 citation statements)

References 6 publications

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“…In the case of poor availability of GPS satellite due to signal obstruction or weak geometry, a possible solution, among others (use supplementary sensors e.g. accelerometers [2,3], Robotic Total Station [4,5], Locata [6,7], UWB [8]), is the combination of GPS and other GNSS constellation [9][10][11]. The combination of two or more satellite systems offers more visible satellites to users, and that will enhance the satellite geometry with the expectation of improving the overall positioning solution [12,13].…”

Section: Introductionmentioning

confidence: 99%

Investigating multi-GNSS performance in the UK and China based on a zero-baseline measurement approach

et al. 2017

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GPS is the positioning tool of choice for a wide variety of applications where accurate (cm level or less) positions are required. However GPS is susceptible to a variety of errors that degrade both the quality of the position solution and the availability of these solutions.The contribution of additional observations from other GNSS systems may improve the quality of the positioning solution. This study investigates the contribution of the GLONASS and BeiDou systems and the potential improvement to the precision achieved compared to positioning using GPS only measurements. Furthermore, it is investigated whether the combination of the satellite systems can limit the noise level of the GPS-only solution. A series of zero-baseline measurements, of 1Hz sampling rate, were recorded with different types of pairs of receivers over 12 consecutive days in the UK and in China simultaneously.The novel part in this study is comparing the simultaneous GNSS real measurements recorded in the UK and China. Moreover, the correlation between the geometry and positional precision was investigated.The results indicate an improvement in a multi-GNSS combined solution compared to the GPS-only solution, especially when the GPS-only solution derives from weak satellite geometry, or the GPS-only solution is not available. Furthermore, all the outliers due to poor satellite coverage with the individual solutions are limited and their precision is improved, agreeing also with the improvement in the mean of the GDOP, i.e. the mean GDOP was improved from 3.0 for the GPS only solution to 1.8 for the combined solution.However, the combined positioning did not show significant positional improvement when GPS has a good geometry and availability.2

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Section: Introductionmentioning

confidence: 99%

Investigating multi-GNSS performance in the UK and China based on a zero-baseline measurement approach

et al. 2017

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“…Locata technology is an Australian innovation developed to augment GNSS with additional terrestrial signals as in the case where there is insufficient sky view for GNSS positioning or to replace GNSS in indoor environment (Montillet et al 2009). Locata permits considerable flexibility in system design due to complete control over both the signal transmitters and the user receivers.…”

Section: Backup To Gnss Positioningmentioning

confidence: 99%

The Australian approach to geospatial capabilities; positioning, earth observation, infrastructure and analytics: issues, trends and perspectives

Woodgate

Coppa

Choy

et al. 2017

Geo-spatial Information Science

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This paper examines the current state of three of the key areas of geospatial science in Australia: positioning; earth observation (EO); and spatial infrastructures. The paper discusses the limitations and challenges that will shape the development of these three areas of geospatial science over the next decade and then profiles what each may look like in about 2026. Australia's national positioning infrastructure plan is guiding the development of a nation-wide, sub decimeter, real-time, outdoor positioning capability based on multi-GNSS and in particular the emerging precise point positioning − real-time kinematic (PPP-RTK) capability. Additional positioning systems including the ground-based Locata system, location-based indoor systems, and beacons, among others are also discussed. The importance of the underpinning role of a next generation dynamic datum is considered. The development of Australia's first EO strategy is described along with the key national needs of the products of remote sensing. The development of massive on-line multi-decadal geospatial imagery data stores and processing engines for co-registered stacks of continuous base-line satellite imagery are explored. Finally, perspectives on the evolution of a future spatial knowledge infrastructure (SKI) emerging from today's traditional spatial data infrastructures (SDIs) are provided together with discussion of the growing importance of geospatial analytics for transforming whole supply chains.

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“…Clustering of signals (2 Â 2) to detect and mitigate noise (multipath). TimeLoc procedure to precisely synchronise the network (LocataNet) (Montillet et al 2009). …”

Section: Locatamentioning

confidence: 99%

“…Research at the University of Nottingham (Montillet et al 2009) and the University of New South Wales (Barnes et al 2007) indicate Locata as an alternative to GNSS in areas di‰cult for satellite positioning such as urban environments. The results indicated that the Locata system is able to position to centimetre level using carrier phase solutions.…”

Section: Integrated Geometrymentioning

confidence: 99%

Indoor multipath effect study on the Locata system

Bonenberg

Hancock

Roberts

2010

Journal of Applied Geodesy

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Abstract. GNSS has become one of the most widespread measurement technologies, allowing cm-level positioning accuracy using RTK or Network RTK. Unfortunately, the system's major drawbacks are the requirement for a clear view of the sky and accuracy dependent on the geometric distribution of the satellites, not only varying throughout the day but also prone to location specific problems. With widespread utilisation of GNSS for monitoring of manmade structures and other civil engineering tasks, such shortcomings can be critical. One of possible solution is the deployment of a supporting system, such as Locata -a terrestrial positioning technology, which mitigates the need for a clear view of the sky and provides system integrity control. This paper, part of the proposed integration feasibility study, presents Locata performance indoors, its capacity and mitigation methods.

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Deploying a Locata network to enable precise positioning in urban canyons

Cited by 49 publications

References 6 publications

Investigating multi-GNSS performance in the UK and China based on a zero-baseline measurement approach

Investigating multi-GNSS performance in the UK and China based on a zero-baseline measurement approach

The Australian approach to geospatial capabilities; positioning, earth observation, infrastructure and analytics: issues, trends and perspectives

Indoor multipath effect study on the Locata system

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