Absolute calibration of GPS antennas: laboratory results and comparison with field and robot techniques

Görres, Barbara; Campbell, James; Becker, Matthias; Siemes, M.

doi:10.1007/s10291-005-0015-3

Cited by 86 publications

(42 citation statements)

References 5 publications

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“…As the phase centres vary with the observation direction, these antenna phase centre variations (PCVs) have to be corrected in high precision GPS application. Receiver antenna PCVs can be determined by relative field calibrations (Mader 1999), by absolute robot calibrations (Menge et al 1998) and by anechoic chamber measurements (Görres et al 2006). Absolute and anechoic calibration methods agree within *1 mm (Görres et al 2006).…”

Section: Satellite and Receiver Antenna Phase Centre Modelsmentioning

confidence: 99%

“…Receiver antenna PCVs can be determined by relative field calibrations (Mader 1999), by absolute robot calibrations (Menge et al 1998) and by anechoic chamber measurements (Görres et al 2006). Absolute and anechoic calibration methods agree within *1 mm (Görres et al 2006). Schmid and Rothacher (2003) showed that absolute satellite antenna PCVs can be estimated within global GPS solutions.…”

Section: Satellite and Receiver Antenna Phase Centre Modelsmentioning

confidence: 99%

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Improved Constraints on Models of Glacial Isostatic Adjustment: A Review of the Contribution of Ground-Based Geodetic Observations

et al. 2010

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The provision of accurate models of Glacial Isostatic Adjustment (GIA) is presently a priority need in climate studies, largely due to the potential of the Gravity Recovery and Climate Experiment (GRACE) data to be used to determine accurate and continent-wide assessments of ice mass change and hydrology. However, modelled GIA is 123Surv Geophys (2010) 31:465-507 DOI 10.1007/s10712-010-9100-4 uncertain due to insufficient constraints on our knowledge of past glacial changes and to large simplifications in the underlying Earth models. Consequently, we show differences between models that exceed several mm/year in terms of surface displacement for the two major ice sheets: Greenland and Antarctica. Geodetic measurements of surface displacement offer the potential for new constraints to be made on GIA models, especially when they are used to improve structural features of the Earth's interior as to allow for a more realistic reconstruction of the glaciation history. We present the distribution of presently available campaign and continuous geodetic measurements in Greenland and Antarctica and summarise surface velocities published to date, showing substantial disagreement between techniques and GIA models alike. We review the current state-of-the-art in ground-based geodesy (GPS, VLBI, DORIS, SLR) in determining accurate and precise surface velocities. In particular, we focus on known areas of need in GPS observation level models and the terrestrial reference frame in order to advance geodetic observation precision/accuracy toward 0.1 mm/year and therefore further constrain models of GIA and subsequent present-day ice mass change estimates.

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Section: Satellite and Receiver Antenna Phase Centre Modelsmentioning

confidence: 99%

Section: Satellite and Receiver Antenna Phase Centre Modelsmentioning

confidence: 99%

Improved Constraints on Models of Glacial Isostatic Adjustment: A Review of the Contribution of Ground-Based Geodetic Observations

et al. 2010

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“…The latest version of the GOA-II software (version 6.3) was used. The ocean tide model FES 2004, recommended by the International Global Navigation Satellite System Service, was applied in this processing (Lyard et al 2006), and absolute calibration was performed to ensure the correct phase center variation, as reported by Görres (2006). The zenith wet delay was obtained from the ZTD after 10 removing the zenith hydrostatic delay obtained through the application of a representative tropospheric temperature model and a surface pressure measurement (Davis et al 1985).…”

Section: High Temporal Resolution Gps-pwv Time Seriesmentioning

confidence: 99%

GPS-PWV jumps before intense rain events

Sapucci

Machado

Souza

et al. 2016

Preprint

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Abstract.A rapid increase in atmospheric water vapor is a fundamental ingredient for many intense rainfall events. High-10 frequency precipitable water vapor (PWV) estimates from a Global Positioning System meteorological site (GPS) are evaluated here for intense rainfall events during the CHUVA Vale field campaign in Brazil (November-December 2011), in which precipitation events of differing intensities and spatial dimensions, as observed by an X-band radar, have been explored. A wavelet cross-correlation analysis shows that there are important spikes in the PWV that precede the more intense rainfall events on a timescale from 30 to 60 minutes. The correlation and lags between the GPS-PWV and rainfall 15 events are evaluated, and a sharp increase in the GPS-PWV prior to the more intense events has been found and termed GPS-PWV "jumps". These jumps are associated with water vapor convergence and the continued formation of cloud condensate and precipitation particles. The GPS-PWV time-derivative histogram for the period of 60 minutes before the rainfall event reveals different distributions for higher intensity events. This feature could indicate the occurrence of severe precipitation and consequently has the potential for application in nowcasting activities. 20

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“…Contrary to relative GNSS PCCs, absolute calibrations do not depend on a reference antenna. The absolute corrections may come either from anechoic chambers, as it was demonstrated by Schupler et al (1994) and later refined by Görres et al (2006), or field calibrations using a robot (Menge et al 1998;Wüb-bena et al 2006). The absolute PCCs are not influenced by multipath, as it is often the case in relative calibrations.…”

Section: Introductionmentioning

confidence: 99%

The impact of the antenna phase center models on the coordinates in the EUREF Permanent Network

Araszkiewicz

Völksen

2016

GPS Solut

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Precise positioning using the signals of the Global Position System requires correcting the distance between the points of reception of the signal carrier phase and the antenna reference point. Sophisticated models to account for these phase errors are available and widely in use. These models are usually based on calibrations of several antennas of the same type to derive a mean model. There is also the possibility of applying individual correction models that are derived for one single antenna, since the individual antennas may still vary by a few millimeters. We prepared two sets of station position time series to understand the impact of using type mean or individual antenna correction models. At first, we estimated the station positions using the type mean model for the antenna corrections as it is provided by the IGS. Second, the same processing strategy was used, but this time with individual antenna correction models provided they were available. Then, based on these two solutions, we evaluated how different antenna corrections impact the network alignment and subsequently station coordinates. We showed that mixing two sources of antenna phase center corrections may influence the reference frame realization. However, this impact is very small and can be reduced by an appropriate selection of reference stations. Finally, we demonstrated that for some antennas, the application of type mean or individual antenna calibration models may cause a discrepancy in the position of over 10 mm for the horizontal and vertical component. However, for most of the antennas these offsets are below 2 mm for horizontal components and below 4 mm for vertical component. Thereby, for common antennas we confirmed the results obtained by others.

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Absolute calibration of GPS antennas: laboratory results and comparison with field and robot techniques

Cited by 86 publications

References 5 publications

Improved Constraints on Models of Glacial Isostatic Adjustment: A Review of the Contribution of Ground-Based Geodetic Observations

Improved Constraints on Models of Glacial Isostatic Adjustment: A Review of the Contribution of Ground-Based Geodetic Observations

GPS-PWV jumps before intense rain events

The impact of the antenna phase center models on the coordinates in the EUREF Permanent Network

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