Impact of GPS satellite antenna offsets on scale changes in global network solutions

Ge, Maorong; Gendt, G.; Dick, Galina; Zhang, F. P.; Reigber, Ch.

doi:10.1029/2004gl022224

Cited by 65 publications

(49 citation statements)

References 9 publications

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“…This small relative drift is close to the estimated error of ITRF2008 Argus, 2012;Collilieux et al, 2014], implying we cannot identify which of the underlying geodetic techniques (VLBI/SLR or GPS) is preferred for long-term scale stability. Though we can discern some small interannual variations in the time series, there is no evidence of the abrupt (∼1 ppb) scale instabilities which originally implicated the GPS satellite antenna models as significant error sources [Ge et al, 2005]. While some of the remaining systematic variations could be due to the changing composition of the GPS constellation and ground network, these discrepancies may also stem from the aging of ITRF2008.…”

Section: Results: Scalementioning

confidence: 66%

“…Ge et al [2005] demonstrated that errors in contemporaneous international (IGS) standards for the GPS APC induced a rapid scale change of about 1 ppb over 1 year. They attributed this effect to the evolution of the GPS space segment: as legacy satellites were gradually replenished with modernized systems, the ensemble effect of the APC errors on the different satellite types (blocks) changed.…”

Section: Gps Transmit Antennasmentioning

confidence: 99%

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Realizing a terrestrial reference frame using the Global Positioning System

et al. 2015

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We describe a terrestrial reference frame (TRF) realization based on Global Positioning System (GPS) data alone. Our approach rests on a highly dynamic, long‐arc (9 day) estimation strategy and on GPS satellite antenna calibrations derived from Gravity Recovery and Climate Experiment and TOPEX/Poseidon low Earth orbit receiver GPS data. Based on nearly 17 years of data (1997–2013), our solution for scale rate agrees with International Terrestrial Reference Frame (ITRF)2008 to 0.03 ppb yr−1, and our solution for 3‐D origin rate agrees with ITRF2008 to 0.4 mm yr−1. Absolute scale differs by 1.1 ppb (7 mm at the Earth's surface) and 3‐D origin by 8 mm. These differences lie within estimated error levels for the contemporary TRF.

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Section: Results: Scalementioning

confidence: 66%

Section: Gps Transmit Antennasmentioning

confidence: 99%

Realizing a terrestrial reference frame using the Global Positioning System

et al. 2015

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“…As this pattern is visible for all four AC solutions, the network distribution is probably not responsible for this behavior. Ge et al (2005) have already reported such scale changes related to the satellite constellation changes. It might be possible that the IGS calibrated APCOs are not yet optimal but this needs to be demonstrated.…”

Section: Gps Scalementioning

confidence: 93%

Quality assessment of GPS reprocessed terrestrial reference frame

et al. 2010

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The International GNSS Service (IGS) contributes to the construction of the International Terrestrial Reference Frame (ITRF) by submitting time series of station positions and Earth Rotation Parameters (ERP). For the first time, its submission to the ITRF2008 construction is based on a combination of entirely reprocessed GPS solutions delivered by 11 Analysis Centers (ACs). We analyze the IGS submission and four of the individual AC contributions in terms of the GNSS frame origin and scale, station position repeatability and time series seasonal variations. We show here that the GPS Terrestrial Reference Frame (TRF) origin is consistent with Satellite laser Ranging (SLR) at the centimeter level with a drift lower than 1 mm/year. Although the scale drift compared to Very Long baseline Interferometry (VLBI) and SLR mean scale is smaller than 0.4 mm/ year, we think that it would be premature to use that information in the ITRF scale definition due to its strong dependence on the GPS satellite and ground antenna phase center variations. The new position time series also show a better repeatability compared to past IGS combined products and their annual variations are shown to be more consistent with loading models. The comparison of GPS station positions and velocities to those of VLBI via local ties in co-located sites demonstrates that the IGS reprocessed solution submitted to the ITRF2008 is more reliable and precise than any of the past submissions. However, we show that some of the remaining inconsistencies between GPS and VLBI positioning may be caused by uncalibrated GNSS radomes.

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“…First, slowly varying systematic errors may map into quasi-secular bias in site positions. One example of this is provided by Ge et al (2005) who demonstrated satellite-specific antenna phase centre offsets from the satellite centre of mass. As the design of in-orbit GPS satellites has evolved over time, neglecting this bias resulted in a quasi-secular variation in GPS scale.…”

Section: Introductionmentioning

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 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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Impact of GPS satellite antenna offsets on scale changes in global network solutions

Cited by 65 publications

References 9 publications

Realizing a terrestrial reference frame using the Global Positioning System

Realizing a terrestrial reference frame using the Global Positioning System

Quality assessment of GPS reprocessed terrestrial reference frame

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

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