Wet tropospheric effects on precise relative GPS height determination

Dodson, Alan; Shardlow, Peter; Hubbard, Lisa C.; Elgered, Gunnar; Jarlemark, Per

doi:10.1007/bf00873700

Cited by 83 publications

(33 citation statements)

References 11 publications

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“…The gravity change data can be estimated from the predicted settlement and the coal mass with the normal vertical gravity gradient of 0.3086 µGal/mm by Equation (1). Then the subsidence of each point can be obtained from the simulated gravity data and the coal mass by Equation (3). So these simulated data are referenced for the following study to verify the correction of the inversed values.…”

Section: Simulation Casementioning

confidence: 99%

“…Satellite-based techniques such as GPS and interferometric synthetic aperture radar (InSAR) are increasingly popular to monitor the coal mining subsidence. Height changes can be efficiently determined by GPS technique which will take the long time to collect GPS data and use the dedicated models to remove the environmental effects to achieve the observation precision of millimeter level [3][4][5][6]. InSAR can monitor the two-dimensional surface deformation with the limited spatial-temporal resolution.…”

Section: Introductionmentioning

confidence: 99%

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A New Method to Monitor the Coal Mining Subsidence by Gravimetry

Guo¹,

He²,

Yi³

et al. 2015

TOEFJ

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Coal mining subsidence seriously affects the mine natural and ecological environment. Leveling is the traditional method to monitor the coal mining subsidence. It is possible to monitor the subsidence by gravimetry instead of leveling based on the negative linear correlation between the gravity change and the height change. Equations are derived to monitor the subsidence by gravimetry in the paper. Height change errors are analyzed by considering the uncertainties of gravity data and coal masses based on the error propagation theory. The probability integration method is utilized to simulate data of gravity, height and coal mass as well as the corresponding random errors. These data are processed with the new method to monitor the subsidence and its precision. The experimental results show that gravimetry can replace leveling to monitor the coal mining subsidence when the precision of gravity data is up to level of 3 µGal.

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Section: Simulation Casementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A New Method to Monitor the Coal Mining Subsidence by Gravimetry

Guo¹,

He²,

Yi³

et al. 2015

TOEFJ

View full text Add to dashboard Cite

show abstract

“…Due to the long baselines the final GPS solutions were computed using a linear ionosphere-free combination of L1 and L2 observable and the double difference processing technique associated with the JPL precise ephemeredes was used to determine the baseline vectors. Wet troposphere delay effects were modeled using a random walk stochastic processed (discussed in Dodson et al, 1996). The computation models closely follow the IERS Standards (McCarthy, 1992).…”

Section: Gps Data Analysis Using the Gipsy/oasis II Softwarementioning

confidence: 99%

Crustal strain pattern analysis of Korean peninsula using repeated GPS measurements

Song

Yun

2008

KSCE Journal of Civil Engineering

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This paper deals with the characteristics of strain pattern by using permanent GPS stations in South Korea in terms of seismic activity and tectonics. We have estimated patterns and rates of crustal motion strain in South Korea for 2002-2004 by using GPS daily solutions. Eight GPS stations involved in precise baseline vector solution and horizontal strain components were calculated using the differences of baseline length during the time span of three years. The mean rate of maximum shear strain was 0.13 µ/yr. The mean direction of principal axes of compression was about N72°E. This direction is in accordance with the P-axis distribution of focal mechanisms of earthquakes in and around the Korean peninsula.

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“…The final IGS GPS satellite ephemerides (http://www.igscb.jpl.nasa.gov/components/prods_cb.html) were used in the coordinate determination. Careful modeling of tropospheric delay is essential for accurate determination of height in GPS positioning (Dodson et al 1996). For the tropospheric delay, we used the Saastamoinen model and took into account the zenithdependent variation of tropospheric delay (Leick 2004).…”

Section: Gpsmentioning

confidence: 99%

Results of geodetic and geotechnical monitoring of subsidence for Taiwan High Speed Rail operation

2008

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Taiwan High Speed Rail (THSR), which began operations in January 2007, passes through an area in Yunlin County where the largest cumulative subsidence measured during 1992-2006 exceeds 100 cm. Leveling benchmarks, GPS pillars and multilevel monitoring wells were deployed in this area to collect detailed subsidence data from October 2003 to 2006. Leveling is carried out on both ground benchmarks and survey bolts attached to THSR columns. Minimum constraint solutions of leveling networks produce estimated heights accurate to a few mm. Special attention is paid to code smoothing, ionospheric, tropospheric and ocean tidal loading (OTL) effects, so that height estimates from GPS are optimal. Leveling and GPS-derived height changes are consistent to 1 cm, and show that from Stations 210 to 240K of TSHR, the subsidence is bowl shaped. Measurements of sediment compaction in specific depth intervals at three monitoring wells indicate that most of the subsidence is caused by sediment compaction at depths from 50 to 300 m. The major compaction occurs in the interval 220-300 m and is attributed to ground water withdrawal. Large angular deflections as determined from subsidence measurements are detected at some columns, but are below the upper bound (1/1,000) of tolerance specified in the safety code. With the current subsidence and sediment compaction, no significantly reduced loading capacity of the columns is expected to occur. For a safe THSR operation, subsidence and sediment-compaction monitoring should be continued, and current ground water withdrawal in Yunlin must be reduced or stopped.

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Wet tropospheric effects on precise relative GPS height determination

Cited by 83 publications

References 11 publications

A New Method to Monitor the Coal Mining Subsidence by Gravimetry

A New Method to Monitor the Coal Mining Subsidence by Gravimetry

Crustal strain pattern analysis of Korean peninsula using repeated GPS measurements

Results of geodetic and geotechnical monitoring of subsidence for Taiwan High Speed Rail operation

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