Development of an antenna and multipath calibration system for Global Positioning System sites

Park, K.-D.; Elósegui, P.; Davis, J. L.; Jarlemark, Per; Corey, B. E.; Niell, A. E.; Normandeau, J.; Meertens, Charles; Andreatta, V.

doi:10.1029/2003rs002999

Cited by 25 publications

(18 citation statements)

References 15 publications

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“…As highlighted by Elósegui et al [1995], the permanent structures (e.g., pillars) to which the antennas are typically mounted become electromagnetically coupled 10.1002 to the antennas themselves. Calibration systems for recovering the comprehensive site-dependent antenna patterns (intrinsic APV plus multipath) have yielded promising results [Park et al, 2004;Wübbena et al, 2006]. These hardware systems, however, involve the use of large high-gain antennas or robots and have not yet been widely used to provide site-specific antenna calibrations, e.g., for a globally dispersed network of GPS ground stations.…”

Section: Using Terrestrial Antennas As Referencesmentioning

confidence: 99%

“…Site-specific APV calibrations can be readily developed using empirical techniques [Hurst and Bar-Sever, 1998]. Characterizing the absolute pattern correctly, however, may first require the use of dedicated calibration systems [e.g., Park et al, 2004;Wübbena et al, 2006] at one or more reference stations in order to compensate for singularities with the network scale.…”

Section: Summary and Future Workmentioning

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: Using Terrestrial Antennas As Referencesmentioning

confidence: 99%

Section: Summary and Future Workmentioning

confidence: 99%

Realizing a terrestrial reference frame using the Global Positioning System

et al. 2015

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“…In addition, the effects of unmodelled signal from the reactive near field were studied by Dilssner et al (2008) who also found substantial time-variable noise in GPS coordinate time series. A robust method to model (e.g., Park et al 2004) or mitigate multipath and scattering effects (e.g., Elosegui et al 1995) must be a high priority in the GPS community and similar studies are required for DORIS.…”

Section: Local Site Effectsmentioning

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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“…An example in the former category is the so-called ''monument motion'' (discussed below), while examples for the latter include positioning errors caused by multipath (also discussed below), antenna phase center variations [Elósegui et al, 1995;Park et al, 2004], unmodeled atmospheric effects [e.g., Davis et al, 1985;Treuhaft and Lanyi, 1987;Kedar et al, 2003], and satellite orbit errors [e.g., Baueršíma, 1983]. While some of these errors (e.g., atmospheric effects and satellite orbit errors) will have some degree of cancelation over shorter intersite distances, others are noncanceling, site-specific effects (e.g., monument motion and local multipath errors).…”

Section: Introductionmentioning

confidence: 99%

“…The two stations at Slide Mountain receive signals that are split from the same antenna, thus creating a ''zero-baseline'' (ZBL) network. Since these stations have the same instrumentation as that of the short-baseline stations (Table 1), we can use them to determine lower bounds for the level of receiver or software noise we might expect [Park et al, 2004].…”

Section: Introductionmentioning

confidence: 99%

Characterization of site‐specific GPS errors using a short‐baseline network of braced monuments at Yucca Mountain, southern Nevada

et al. 2009

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[1] We use a short-baseline network of braced monuments to investigate site-specific GPS effects. The network has baseline lengths of $10, 100, and 1000 m. Baseline time series have root mean square (RMS) residuals, about a model for the seasonal cycle, of 0.05-0.24 mm for the horizontal components and 0.20-0.72 mm for the radial. Seasonal cycles occur, with amplitudes of 0.04-0.60 mm, even for the horizontal components and even for the shortest baselines. For many time series these lag seasonal cycles in local temperature measurements by 23-43 days. This could suggest that they are related to bedrock thermal expansion. Both shorter-period signals and seasonal cycles for shorter baselines to REP2, the one short-braced monument in our network, are correlated with temperature, with no lag time. Differences between REP2 and the other stations, which are deep-braced, should reflect processes occurring in the upper few meters of the ground. These correlations may be related to thermal expansion of these upper ground layers, and/or thermal expansion of the monuments themselves. Even over these short distances we see a systematic increase in RMS values with increasing baseline length. This, and the low RMS levels, suggests that site-specific effects are unlikely to be the limiting factor in the use of similar GPS sites for geophysical investigations.

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Development of an antenna and multipath calibration system for Global Positioning System sites

Cited by 25 publications

References 15 publications

Realizing a terrestrial reference frame using the Global Positioning System

Realizing a terrestrial reference frame using the Global Positioning System

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

Characterization of site‐specific GPS errors using a short‐baseline network of braced monuments at Yucca Mountain, southern Nevada

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