The NKG2008 GPS campaign – final
transformation results and a new common Nordic
reference frame

Häkli, Pasi; Lidberg, Martin; Jivall, Lotti; Nørbech, Torbjørn; Tangen, Oddvar; Weber, M.; Pihlak, Priit; Aleksejenko, Ivars; Paršeliūnas, Eimuntas

doi:10.1515/jogs-2016-0001

Cited by 14 publications

(5 citation statements)

References 10 publications

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“…These effects should be considered in high-accuracy positioning by appropriately transforming the coordinates taking them into account. The Nordic Geodetic Commission (NKG) has developed the NKG coordinate transformation methodology that considers both the rigid Eurasian plate motion and the intraplate deformations [ 42 ]. In this study, we have used the NKG2020 transformation, which is the latest version of this methodology at the time of this writing and enables an accuracy of a few millimeters [ 43 ].…”

Section: Methodsmentioning

confidence: 99%

RTK+OSNMA Positioning for Road Applications: An Experimental Performance Analysis in Finland

Vallet García,

Bhuiyan

2024

Sensors

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We compare the performance of dual-band (GPS L1/L2 and Galileo E1/E5a) real-time kinematic (RTK) positioning in an open sky and urban scenarios in southern Finland using two different authentication schemes: one using only satellites authenticated by Galileo’s open service navigation message authentication (OSNMA) service (which at the moment of our tests led to using only authenticated Galileo satellites) and the other with no authentication. The results show the actual trade-off between accuracy and availability vs. authenticity associated with using only OSNMA-authenticated satellites, while the authentication of only Galileo satellites is possible (e.g., a drop of RTK positioning availability from 96.67 to 86.01% in our open sky and from 73.55 to 18.65% in our urban scenarios, respectively), and an upper bound of the potential performance that could be reached in similar experimental conditions had the authentication of GPS satellites been supported (e.g., an overall 14 cm and 10.20 m 95% horizontal accuracy in our open sky and urban scenarios, with below 30, 20 and 10 cm during 97.39, 96.03 and 92.43% of the time in the open sky and 49.12, 45.96 and 39.63% in the urban scenarios, respectively).

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Section: Methodsmentioning

confidence: 99%

RTK+OSNMA Positioning for Road Applications: An Experimental Performance Analysis in Finland

Vallet García,

Bhuiyan

2024

Sensors

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“…In addition to the rigid plate motion, there is the Glacial Isostatic Adjustment (GIA), the most notable effect of which is the postglacial rebound in the Fennoscandian area. This causes intra-plate motion as shown in Figure 6, showing the NKG RF03vel model by the Nordic Geodetic Commission (NKG) (Häkli et al, 2016). It shows that annual vertical velocities in Finland vary between 1 and 9 mm and horizontal velocities are up to 2 mm.…”

Section: Deformation Of Reference Frames In Finlandmentioning

confidence: 96%

“…One way to improve the accuracy of transformations from ITRF to EUREF-FIN is to use GIA models and GNSS time series as described in Häkli et al, 2016.…”

Section: Deformation Of Reference Frames In Finlandmentioning

confidence: 99%

Assessment of sparse GNSS network for network RTK

Koivula

Kuokkanen

Marila

et al. 2018

Journal of Geodetic Science

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We tested the accuracy and usability of a sparse GNSS reference station network for network RTK (NRTK) using the Finnish permanent GNSS network FinnRef. We modified the configuration of the FinnRef network stations used in NRTK computation. This allowed us to perform the test both inside and outside of the network area using different NRTK methods and two different RTK receivers. In the test area the average distance between the FinnRef stationswas 160 km. As a comparison,we tested also with the commercial Trimnet and HxGN SmartNet positioning services operated by Geotrim Oy and Leica Geosystems Finland, respectively. Tests showed that the horizontal and vertical rms of Trimnet servicewas 16mmand 40 mm, and of HxGN SmartNet service 23mmand 48 mm. The best rms for the sparse NLS (National Land Survey of Finland) Service was 22 mm and 56 mm. These results indicate that a good NRTK solution can be achieved with a sparser network than typically used. This study also indicates, that the methods for NRTK processing can also affect the quality of the solution.

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“…Results from four sample regions containing these locations are given in Table 3. locations i, non-tidal (e.g. [28], [27]) ellipsoidal heightsĥ i expressed in the ETRS89 realization EUREF89 [14] have been derived from GPS observations, yielding pointwise available estimates p i of height anomalies ζ i…”

Section: Least-squares Collocationmentioning

confidence: 99%

On the uncertainty of height anomaly differences predicted by least-squares collocation

Mysen

2020

Journal of Geodetic Science

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A network of pointwise available height anomalies, derived from levelling and GPS observations, can be densified by adjusting a gravimetric quasigeoid using least-squares collocation. The resulting type of Corrector Surface Model (CSM) is applied by Norwegian surveyors to convert ellipsoidal heights to normal heights expressed in the official height system NN2000. In this work, the uncertainty related to the use of a CSM to predict differences in height anomaly was sought. As previously, the application of variograms to determine the local statistical properties of the adopted collocation model led to predictions that were consistent with their computed uncertainties. For the purpose of predicting height anomaly differences, the effect of collocation was seen to be moderate in general for the small spatial separations considered (< 10 km). However, the relative impact of collocation could be appreciable, and increasing with distance, near the network. At last, it was argued that conservative uncertainties of height anomaly differences may be obtained by rescaling output of a grid interpolation by \sqrt \Delta, where Δ is the spatial separation of the two locations for which the difference is sought.

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The NKG2008 GPS campaign – final transformation results and a new common Nordic reference frame

Cited by 14 publications

References 10 publications

RTK+OSNMA Positioning for Road Applications: An Experimental Performance Analysis in Finland

RTK+OSNMA Positioning for Road Applications: An Experimental Performance Analysis in Finland

Assessment of sparse GNSS network for network RTK

On the uncertainty of height anomaly differences predicted by least-squares collocation

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