Contributions to the theory of atmospheric refraction

Saastamoinen, J.

doi:10.1007/bf02522083

Cited by 596 publications

(212 citation statements)

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“…In terms of the troposphere, the hydrostatic component of the zenith total delay is modelled using Saastamoinen (Saastamoinen, 1973) and the wet component of the zenith total delay is estimated as a state in the Kalman filter for every epoch, i.e. at 30 second intervals.…”

Section: Ppp Daily Solutions Methodologymentioning

confidence: 99%

An assessment of static precise point positioning using GPS only, GLONASS only, and GPS plus GLONASS

et al. 2016

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Abstract:The aim of this paper is to look into the achievable repeatability and accuracy from Precise Point Positioning (PPP) daily solutions when using GPS only (PPP GPS), GLONASS only (PPP GLO), and GPS plus GLONASS (PPP GPS+GLO) for static positioning. As part of the assessment, a comparison with global double difference (DD) GPS daily solutions is presented. It is shown, therefore, that all of the PPP daily solutions can achieve millimetric level repeatability, similar to the global DD GPS solutions. Furthermore, the mean of the biases between the PPP daily solutions and the global DD GPS daily solutions are constellation type dependent, while an improvement is found in the vertical component for PPP GPS+GLO over PPP GLO, as the latter may be more affected by any imperfections in the models for GLONASS antenna phase centre variations. It is concluded that PPP GLO daily solutions have the ability to be used as independent solutions to PPP GPS daily solutions for static positioning, and as an alternative to PPP GPS+GLO or global DD GPS daily solutions.

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Section: Ppp Daily Solutions Methodologymentioning

confidence: 99%

An assessment of static precise point positioning using GPS only, GLONASS only, and GPS plus GLONASS

et al. 2016

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“…Besides that, the distribution of temperature and water vapor may lead deviations from this simple equation. It exclusively been used for small zenith angle, from 0 0 to 0 60 [5]. The tropospheric delay (TD) at any elevation angles can be explicit in terms of the zenith delays and mapping functions.…”

Section: Tropospheric Delaymentioning

confidence: 99%

“…Previously, the Saastamoinen model [5] did not use a mapping function in the same sense as the models with continued fractions. The calculation for finding the mapping function scale factor is quite tedious, whereby there are many mathematical operations to be carried out in order to get the mapping function scale factor value.…”

Section: Mapping Functionmentioning

confidence: 99%

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Simpler hydrostatics component of UNBabc mapping function using nonlinear curve fitting method

Batcha¹,

Sakidin²,

Ahmad³

2016

AIP Conference Proceedings

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“…The zenith hydrostatic delay (ZHD) Zh r can be computed rather accurately using the Saastamoinen model [Saastamoinen, 1973] and meteorological data, the zenith wet delay (ZWD) Zw r and horizontal gradients G N and G E in north and east directions have to be estimated as parameters. Mh s r and Mw s r are the hydrostatic and wet coefficients of the global mapping function (GMF) [Böhm et al, 2006]; e and a are the elevation and azimuth angles.…”

Section: Retrieving Multi-gnss Gradientmentioning

confidence: 99%

Retrieving high‐resolution tropospheric gradients from multiconstellation GNSS observations

Zus

et al. 2015

Geophysical Research Letters

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The developing multi‐Global Navigation Satellite Systems (GNSS) constellations have the potential to provide accurate high‐resolution tropospheric gradients. Such data, closely linked to strong humidity gradients accompanying severe weather phenomena, are considered a new important data source for meteorological studies, e.g., nowcasting of severe rainfall events. Here we describe the development of a multi‐GNSS processing system for the precise retrieval of high‐resolution tropospheric gradients. The retrieved products were validated by using independent water vapor radiometer (WVR) observations and numerical weather model (NWM) data. The multi‐GNSS high‐resolution gradients agree well with those, derived from NWM and WVR, especially for the fast‐changing peaks which were mostly associated with synoptic fronts. Compared to GPS‐only gradients, the correlations with the validation data are significantly improved up to 20–35%. The new data product has significant potential to improve numerical weather prediction and to advance meteorological studies.

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Contributions to the theory of atmospheric refraction

Cited by 596 publications

References 0 publications

An assessment of static precise point positioning using GPS only, GLONASS only, and GPS plus GLONASS

An assessment of static precise point positioning using GPS only, GLONASS only, and GPS plus GLONASS

Simpler hydrostatics component of UNBabc mapping function using nonlinear curve fitting method

Retrieving high‐resolution tropospheric gradients from multiconstellation GNSS observations

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