Potential of Cost-Efficient Single Frequency GNSS Receivers for Water Vapor Monitoring

Krietemeyer, Andreas; Veldhuis, Marie-Claire ten; Marel, H. van der; Realini, Eugenio; Giesen, Nick van de

doi:10.3390/rs10091493

Cited by 31 publications

(23 citation statements)

References 31 publications

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“…We find that the ZTD results are consistent with previous studies (Deng et al, ; Krietemeyer et al, ; Zhang, Yuan, Wei, et al, ). However, the SFITR approach is more flexible because it is independent of nearby DF stations, while the performance of ZTD derived by using the SEID method proposed by Deng relies on the distance between SF and DF stations.…”

Section: Results and Analysissupporting

confidence: 93%

“…We find that most of the correlation coefficients are above 0.9; therefore, we can conclude that the PWV results derived from the SF, DF, and radiosonde-based methods are consistent with each other. Therefore, the SF-derived PWV values in this paper are equivalent to the results in Krietemeyer et al's study (Krietemeyer et al, 2018) without the limitation of distance between SF and DF stations; this approach is also cost-effective compared with those utilized in Zhang et al's study .…”

Section: Assessment Of Pwv Retrievalmentioning

confidence: 63%

“…Tropospheric and ionospheric delays are the two most crucial atmospheric errors in the global navigation satellite system (GNSS). With the help of surface pressures and weighted mean temperatures, the zenith tropospheric delay (ZTD) can be converted into precipitable water vapor (PWV), which is generally considered as the crucial indicator of the water content in the atmosphere (Bevis et al, ; Krietemeyer et al, ; Zhang, Yuan, Li, et al, ). PWV is closely associated with atmospheric processes, including the hydrological cycle, atmospheric radiation, and climate change (Gutman & Benjamin, ; Wang et al, ).…”

Section: Introductionmentioning

confidence: 99%

“…For the advantages of highaccuracy, all-weather capability and high spatial and temporal resolutions provided by the GNSS, researchers have begun to focus on dual-frequency (DF) GNSS approaches to derive the PWV (Alshawaf et al, 2015;Bevis et al, 1994;Bevis et al, 1992;Jin & Luo, 2009;Li et al, 2015;Wang et al, 2007; since the 1990s. Furthermore, there are also many researchers that have used SF GNSS observations to retrieve the ZTD as well as PWV (Krietemeyer et al, 2018;Wang et al, 2018). However, those methods, for instance, the satellite-specific epoch-differenced ionospheric delay (SEID) proposed by Deng et al (2010), still rely on a station network equipped with DF receivers, and the precision of the estimated ZTD is related to the distance between SF stations and DF stations.…”

Section: Introductionmentioning

confidence: 99%

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Simultaneous Retrieval of PWV and VTEC by Low‐Cost Multi‐GNSS Single‐Frequency Receivers

Zhao

Zhang

et al. 2019

Earth and Space Science

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Precipitable water vapor (PWV) and ionospheric vertical total electron content (VTEC) are two essential components of space‐atmosphere parameters. The zenith troposphere delay can be converted into PWV, which plays a crucial role in meteorological studies. In the meantime, the importance of the VTEC lies in providing ionospheric corrections for single‐frequency (SF) positioning, navigation, and timing users. Currently, the global navigation satellite system (GNSS) has become one of the most commonly used tools for retrieving PWV and VTEC and normally relies on dual‐frequency, geodetic‐grade receivers and antennas. However, this reliance also implies high hardware costs. In this paper, we propose a single‐frequency ionosphere and troposphere retrieval approach that enables the simultaneous retrieval of PWV and VTEC from multi‐GNSS data collected by low‐cost SF receivers. The use of SF receivers can greatly reduce the cost of hardware. Furthermore, the simultaneous provision of PWV and VTEC also has a positive effect on studying the coupling mechanisms of the ionosphere and troposphere. The accuracy of the estimated zenith troposphere delay can be better than 10 mm compared with the troposphere products published by the International GNSS Service, and the PWV is no more than 3 mm compared with radiosonde‐derived results. Referring to the final International GNSS Service global ionosphere map products and the Jason altimeter data, the VTEC retrieved from the single‐frequency ionosphere and troposphere retrieval method can perform at roughly equal levels compared to the customary dual‐frequency method.

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Section: Results and Analysissupporting

confidence: 93%

Section: Assessment Of Pwv Retrievalmentioning

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Simultaneous Retrieval of PWV and VTEC by Low‐Cost Multi‐GNSS Single‐Frequency Receivers

Zhao

Zhang

et al. 2019

Earth and Space Science

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“…goGPS is a MATLAB based GNSS processing software (Realini and Reguzzoni, 2013;Herrera et al, 2016), originally developed for kinematic applications, it has recently re-engineered to fit quasi static applications. In PPP mode (Zumberge et al, 1997) it can be used to estimate ZTD parameters for meteorological applications (Barindelli et al, 2018;Krietemeyer et al, 2018). goGPS applies corrections for antenna phase wind up, relativistic effects, GNSS antennas phase center offset and variations, Earth tide, polar motion earth tides, and ocean Tide Loading (OTL) effects by using coefficients obtained from (http://holt.oso.chalmers.se/loading) using FES 2004 model.…”

mentioning

confidence: 99%

Variability and accuracy of Zenith Total Delay over the East African tropical region

Ssenyunzi

Oruru

D’ujanga

et al. 2019

Advances in Space Research

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The Global Navigation Satellite System (GNSS) can be used to derive accurately the Zenith Tropospheric Delay (ZTD) under allweather conditions. The derived ZTDs play a vital role in climate studies, weather forecasting and are operationally assimilated into numerical weather prediction models. In this study, variations and statistical analysis of GNSS-derived ZTD over the East African tropical region are analysed. The data is collected from 13 geodetic permanent stations for the period of 4 years from 2013 to 2016. The 13 stations consist of 5 International GNSS Service (IGS) stations plus 8 stations as follows: 4 Africa Array stations and 4 Malawi Rifting stations from Uganda, Kenya, Tanzania and Rwanda. The ZTD time series were processed using goGPS software version 1.0 beta1, a MATLAB based GNSS processing software, originally developed for kinematic applications but recently re-engineered for quasi static applications. The annual variation of the ZTD time series was investigated using Lomb Scargle periodograms. The semi-annual frequency has the dominant power in subregion 1 (latitudes 4 S and 4 N) and the annual frequency has the dominant power in subregion 2 (latitudes 12 S to 4 S). The highest ZTD estimates occur during the rainy seasons, at all stations, and the lowest estimates occur during the dry seasons. The results also show that the ZTD estimates are largest at stations located at low elevation (regions close to the Indian Ocean). The derived ZTDs are compared to the values derived from the GIPSY-OASIS via Jet Propulsion Laboratory (JPL) online Automatic Precise Positioning Service (APPS) and the Unified Environmental Modelling System (UEMS) numerical weather prediction (NWP) model. The comparison of goGPS and APPS ZTD at the 13 stations shows an overall average bias, Root Mean Square (RMS) and standard deviation (stdev) of À0.9 mm, 3.2 mm and 3.0 mm respectively, with correlation coefficients ranging from 0.974 to 0.999. The comparison of goGPS ZTD against UEMS NWP ZTD at 8 selected stations shows average bias, RMS and stdev of À12.4 mm, 22.0 mm and 17.6 mm respectively, with correlation coefficients ranging from 0.802 to 0.974. The agreement between the GPS ZTD and the NWP ZTD indicates that goGPS ZTD can be assimilated into NWP models in the East African region.

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Performance of Dual-Frequencies Low-Cost GNSS Sensors for Real Time Monitoring

Poluzzi

Gandolfi

2022

Communications in Computer and Information Science

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The knowledge of the so-called geoid undulation, which represents the height of the geoid above a reference ellipsoid, is a fundamental step to link ellipsoidal heights measured using satellite systems and orthometric heights. Several geoid models are available at the time both at the national or global scale, which can be used for the purpose. Another way to define the geoid undulation is to perform joint measures with GNSS and spirit levelling over common benchmarks. This requires onerous measurements that is seldom possible to perform due to their cost. In this work, we evaluated the possibility to define a local model of the geoid undulation using already available spirit levelling orthometric heights and GNSS ellipsoidal heights measured about 13 years later. The test area is the Emilia-Romagna Adriatic coastline, an area of great interest both from the environmental and economic point of view, which is also undergoing consistent subsidence phenomena.Test results show that the available measurements allow defining a geoid undulation that is coherent with the shape defined by the gravimetric models and also allows to transform ellipsoidal heights into orthometric ones more consistent with the height reference available on the surveyed area. A 7 cm overall bias with respect to the ITALGEO05 was found, whereas ITG2009 and EGM2008 have higher differences. The use of subsidence models to align over time the coordinates used to define the geoid undulation has proven to be a fundamental step. The analysis on the a-priori uncertainty in the geoid height definition shown that the combined use of much more precise GNSS coordinates and contemporary spirit levelling campaign is necessary to significantly improve the resulting geoid height.

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Potential of Cost-Efficient Single Frequency GNSS Receivers for Water Vapor Monitoring

Cited by 31 publications

References 31 publications

Simultaneous Retrieval of PWV and VTEC by Low‐Cost Multi‐GNSS Single‐Frequency Receivers

Simultaneous Retrieval of PWV and VTEC by Low‐Cost Multi‐GNSS Single‐Frequency Receivers

Variability and accuracy of Zenith Total Delay over the East African tropical region

Performance of Dual-Frequencies Low-Cost GNSS Sensors for Real Time Monitoring

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