Uncertainty assessment of a prototype of multilateration coordinate measurement system

Guillory, Joffray; Truong, Daniel; Wallerand, Jean‐Pierre

doi:10.1016/j.precisioneng.2020.08.002

Cited by 16 publications

(17 citation statements)

References 22 publications

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“…This instrument is a prototype developed by CNAM. In controlled environments, the uncertainty of the distance measurement is about 5 um (Guillory et al 2020b;. However, under the environmental conditions of the measurement campaign at GOW, the uncertainties on the measured distances were larger.…”

Section: Data Setmentioning

confidence: 94%

Operator-software impact in local tie networks

et al. 2023

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The operator-software impact describes the differences between results introduced by different operators using identical software packages but applying different analysis strategies to the same data. This contribution studies the operator-software impact in the framework of local tie determination, and compares two different analysis approaches. Both approaches are used in present local tie determinations and mainly differ in the consideration of the vertical deflection within the network adjustment. However, no comparison study has yet been made so far. Selecting a suitable analysis approach is interpreted as a model selection problem, which is addressed by information criteria within this investigation. A suitable model is indicated by a sufficient goodness of fit and an adequate number of model parameters. Moreover, the stiffness of the networks is evaluated by means of principal component analysis. Based on the date of a measurement campaign performed at the Geodetic Observatory Wettzell in 2021, the impact of the analysis approach on local ties is investigated. For that purpose, an innovated procedure is introduced to obtain reference points of space geodetic techniques defining the local ties. Within the procedure, the reference points are defined independently of the used reference frame, and are based on geometrical conditions. Thus, the results depend only on the estimates of the performed network adjustment and, hence, the applied network analysis approach. The comparison of the horizontal coordinates of the determined reference points shows a high agreement. The differences are less than 0.2 mm. However, the vertical components differ by more than 1 mm, and exceed the coverage of the estimated standard deviations. The main reasons for these large discrepancies are a network tilting and a network bending, which is confirmed by a residual analysis.

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Section: Data Setmentioning

confidence: 94%

Operator-software impact in local tie networks

et al. 2023

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“…A detailed analysis of this multilateration system has demonstrated, indoors with an air refractive index well assessed, an uncertainty around 5 µm (k = 1) on the distance measurements for a range of operation of 20 m when the targets are glass spheres (Guillory et al 2022) and of at least 100 m when the targets are corner cubes (Guillory et al 2020). At the end, the propagation of the uncertainties into the coordinates of the measured positions leads to uncertainties up to 25 µm (k = 1) with optimised locations of the heads relative to the targets.…”

Section: Rf Frequency Modulationmentioning

confidence: 99%

The European GeoMetre project: developing enhanced large-scale dimensional metrology for geodesy

et al. 2023

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We provide a survey on the joint European research project “GeoMetre”, which explores novel technologies and their inclusion to existing surveying strategies to improve the traceability of geodetic reference frames to the SI definition of the metre. This work includes the development of novel distance meters with a range of up to 5 km, the realisation of optical multilateration systems for large structure monitoring at an operation distance of 50 m and beyond, and a novel strategy for GNSS-based distance determination. Different methods for refractivity compensation, based on classical sensors, on dispersion, on spectroscopic thermometry, and on the speed of sound to reduce the meteorological uncertainties in precise distance measurements, are developed further and characterised. These systems are validated at and applied to the novel European standard baseline EURO5000 at the Pieniny Kippen Belt, Poland, which was completely refurbished and intensely studied in this project. We use our novel instruments for a reduced uncertainty of the scale in the surveillance networks solutions for local tie measurements at space-geodetic co-location stations. We also investigate novel approaches like close-range photogrammetry to reference point determination of space-geodetic telescopes. Finally, we also investigate the inclusion of the local gravity field to consider the deviations of the vertical in the data analysis and to reduce the uncertainty of coordinate transformations in this complex problem.

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“…Furthermore, the dome wall is equipped with nine interoperable 1.5" drift nests, which magnetically support both reference markers for photogrammetric 5 th Joint International Symposium on Deformation Monitoring (JISDM), 20-22 June 2022, Valencia, Spain 2022, Editorial Universitat Politècnica de València systems and corner cube reflectors for multi-lateration coordinate measurement systems (Guillory et al, 2020) and for polar measurement systems such as laser trackers or total stations (Lösler et al, 2018). The interoperability facilitates the integration of the photogrammetric reference frame into the station survey network later on.…”

Section: B Measurement Setupmentioning

confidence: 99%

A feasibility study for accelerated reference point determination using close range photogrammetry

Eschelbach

Lösler

2022

Proceedings of the 5th Joint International Symposium on Deformation Monitoring - JISDM 2022

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The Global Geodetic Observing System (GGOS) aims for an accuracy of 1 mm in position concerning a global geodetic reference frame such as the International Terrestrial Reference Frame (ITRF). To derive a global frame, several space geodetic techniques are combined. The combination procedure requires the geometric relations between the invariant reference points of these techniques, the so-called local tie vectors. Each space geodetic technique defines its reference point individually, so the determination of the position of the reference point varies significantly between techniques. Within the international GeoMetre project, measurement systems and analysis strategies are developed to improve the quality of local tie vectors and, thus, the quality of the resulting global frame. The use of close range photogrammetry to determine the reference point of a telescope used for Satellite Laser Ranging (SLR) at the GGOS core station Wettzell in September 2020 is considered as a milestone in this project. This contribution deals with a novel approach for an accelerated reference point determination using close range photogrammetry. In comparison to the conventional photogrammetric approach, published so far, this new approach leads to a significant reduction in recording time. However, in case of inappropriate measurement configuration the approach also bears the risk of biased results. Most importantly, the new approach has the potential to be automated, which is one of the primary calls of GGOS for reference point determinations.

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Uncertainty assessment of a prototype of multilateration coordinate measurement system

Cited by 16 publications

References 22 publications

Operator-software impact in local tie networks

Operator-software impact in local tie networks

The European GeoMetre project: developing enhanced large-scale dimensional metrology for geodesy

A feasibility study for accelerated reference point determination using close range photogrammetry

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