Geodesy research at newcastle university
Download
1 / 16

Geodesy Research at Newcastle University - PowerPoint PPT Presentation


  • 173 Views
  • Uploaded on

Geodesy Research at Newcastle University. Peter Clarke Professor of Geophysical Geodesy School of Civil Engineering and Geosciences Newcastle University United Kingdom. Academic Staff. Prof. Peter Clarke Geophysical Geodesy Reference frames, GIA, loading, tectonics, GNSS

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Geodesy Research at Newcastle University' - enid


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Geodesy research at newcastle university

Geodesy Research at Newcastle University

Peter Clarke

Professor of Geophysical Geodesy

School of Civil Engineering and Geosciences

Newcastle University

United Kingdom


Academic staff
Academic Staff

Prof. Peter Clarke

Geophysical Geodesy

Reference frames, GIA,

loading, tectonics, GNSS

Prof. Matt King

Polar Geodesy

Cryospheric applications

of GNSS, GIA, sea level

Dr Nigel Penna

GNSS, tropospheric

water vapour, loading

Prof. Phil Moore

Space Geodesy

Orbit modelling, gravity,

altimetry, SLR

Prof. Philippa Berry

Altimetric Engineering

Inland and coastal

altimetry

Dr Stuart Edwards

Engineering / industrial

GNSS, geohazards


Research staff
Research Staff

Ian Martin

GNSS PrecisePoint Positioning

Kirill Palamartchouk

Geophysical andionospheric GNSSapplications

Liz Petrie

Orbital & ionospheric errors in GNSS

Sophie Bassett

GIA, loading, andreference frames

Rossen Grebenitcharsky

Gravimetric geodesy and satellite orbits

Robert Balmbra

Altimetry

Julien Gazeaux

GPS time series analysis


Impact of future satellite systems on gnss precise point positioning
Impact of future satellite systems onGNSS Precise Point Positioning

  • Russia’s GPS counterpart, GLONASS, being heavily developed

  • Shown on a static IGS site (JPLV) as an example

  • Improved convergence time with GLONASS

  • GLONASS improves the RMS position error due to improved geometry

  • Particularly useful for kinematic positioning and precise navigation

GPS only

GPS + GLONASS


Multipath and long gps time series
Multipath and long GPS time series

  • Looking at effects of unmodelled time-constant carrier phase multipath on long GPS time series through simulation

  • Simulation considers precise point positioning approach

  • Uses real GPS orbits, which do vary with time

  • Proposed mitigation approach (black) works well

3. Simulated effect after mitigation

2. Simulated multipath effect (blue/magenta)

Effects of unmodelled multipath on height at site in Antarctica (MCM4)

1. Real height series

King, M. A., and C. S. Watson (2010), Long GPS coordinate time series: Multipath and geometry effects, J. Geophys. Res., 115, B04403


Sidereal filtering to improve small scale deformation monitoring
Sidereal filtering to improve small-scale deformation monitoring

  • Removing multipath-related coordinate errors

    • Using single-epoch GASPsoftware (in-house)

    • GPS sidereal period of 86154 s

    • Switchedantennafor localnetwork

Ragheb et al., Proc. ION NTM, 2007; Ragheb et al., J. Geodesy, 2007; Ragheb et al., J. Surv. Engrg., 2010


Ocean tide loading and earth structure
Ocean tide loading and monitoringEarth structure

  • Significant anomaliesat M2 period in W Europe

    • Not explained by differencesbetween, or errors in, oceantide models

    • May be due to change in upper mantle elasticityat tidal periods

    • No other geophysicalsignal probes this frequency

M2 residuals to GPS observations (FES2004 model)

FES2004+PREM modelled M2 OTL

Inter-model stdev, 10x scale

Allinson et al., GRL, 2004; King et al., JGR, 2005; Thomas et al., J. Geodesy, 2007; Clarke & Penna, Surv. Rev.,2010;


Non tidal ocean loading effects on geodetic gps heights
Non-tidal ocean loading effects monitoringon geodetic GPS heights

TERS

Williams & Penna (2011), Geophys. Res. Lett.

  • Non-tidal (e.g. surge) ocean loading not considered in GPS analysis

  • Modelled land displacement according to the global ECCO model and the regional high resolution POLSSM model

  • Correlation of >0.7 with state-of-the-art GPS height time series

  • Reduces variance up to 30-40%, POLSSM slightly outperforming ECCO

  • Global high resolution non-tidal ocean models needed for geophysical GPS work


Precise orbit determination and satellite laser ranging

Precise orbit determination and satellite laser ranging monitoring

In house software: Faust

Lavallée, D. A., P. Moore, P. J. Clarke, E. J. Petrie, T. van Dam, and M. A. King (2010), J2: An evaluation of new estimates from GPS, GRACE, and load models compared to SLR, Geophys. Res. Lett., 37, L22403, doi:10.1029/2010GL045229.


Use of remote sensing data for discharge in ungauged catchments

ERS2/ENVISAT altimetry data on Mekong. Satellite altimetry as virtual gauge data every 35 days

Channel cross-sections from Landsat and SAR

and different bathymetric depths for the 50km reach

at Nakhon Phanom and Vientiane.

Q = 7.22 W1.02 Y1.74 S0.35

Q discharge; W river width, Y water

depth (m), S channel slope.

Bjerklie et al. (2003)

Measured and estimated stage-discharge relationships from 1996-2005 at Nakhon Phanom


International gnss service
International GNSS Service catchments

  • Weekly combinationof GPS reference frame

    • In-house TANYA s/ware

    • Backup/check to officialIGS solution

  • Host of IGS 2010 Workshop


Observe mm level changes in Earth’s shape with global network of GPS receivers

Invert shape for mass distribution using an elastic Earth model, like the spring in a set of scales

+

+

=

Tectonic

Motion

Postglacial rebound

Loading

deformation

Secular

Motion

Surface mass loading deformation & the hydrological cycle

Blewitt et al., Science,2001; Blewitt & Clarke, JGR, 2003; Gross et al., GRL, 2004; Clarke et al., GRL, 2005; Lavallée et al., JGR, 2006; Clarke et al., GJI, 2007; Lavallée et al., GRL, 2010


Antarctic gia models vs gps
Antarctic GIA (models vs GPS) network of GPS receivers

East Antarctica

West Antarctica

uplift rate (mm/yr)

Thomas et al. (2011), Geophys. Res. Lett., 38, L22302


Gps deployments 2013 14
GPS deployments 2013-14 network of GPS receivers

  • Mt Wollard & Martin Hills (solar+wind)

  • Mt Johns solar only occupying existing site with historic data


Lower estimates of Antarctic sea level contribution from satellite gravimetry

King, Bingham, Moore, Whitehouse, Bentleyand Milne (2012) Nature, 491, 586-589.

Estimates of basin- scale Antarctic ice mass change from GRACE for Aug 2002 – Dec 2010 in Gt/yr.

Best, lower and upper values.

Continent-wide ice mass change of -69±18 Gt yr-1 (+0.19±0.05 mm yr-1 sea-level equivalent).


Gnss geodesy consultancy and cpd
GNSS / geodesy consultancy and CPD satellite gravimetry

  • Network RTK benchmarking

  • CPD courses:

    • GNSS and Network RTK

    • High Precision GNSS using Post-processing

    • Least Squares Adjustment for Offshore Survey

  • Precise GNSS Positioning

    • deformation monitoring


ad