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Remote GPS Networks: Rationale. Carol A. Raymond, Erik R. Ivins JPL/Caltech. Rationale for Antarctic Continuous GPS stations and Constraints on Station Architecture.

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remote gps networks rationale

Remote GPS Networks:Rationale

Carol A. Raymond, Erik R. Ivins

JPL/Caltech

slide2

Rationale for Antarctic Continuous GPS stations and Constraints on Station Architecture

Continuous GPS measurements contribute to understanding the interaction between ice sheet history and dynamics, and earth rheology. Support time-varying gravity measurements of ice mass change.

  • Rationale for Continuous Measurements:
  • Vertical rates are low (typically few cm?) and need for accuracy is high to resolve gentle gradients
  • Incomplete noise characterization (phase center drifts, biases, seasonal tropospheric variations, ionosphere, reference frame issues)for data lengths of < 30 days?
  • Constraints:
  • If rheology is stiff, and loads are ancient, uplift gradients are small
  • If loads are young, uplift gradients might be large.
  • Likely there will be a spectrum of uplift scales that must be deconvolved to understand their origin in lateral heterogeneity of earth rheology, and/or glacial loading histories of individual drainage basins
high precision vertical components are critical for distinguishing competing models
High precision vertical components are critical for distinguishing competing models

Current results favor recent ice mass change - indicating smaller scale gradients are expected

slide4

W1

WAGN

occupations

W13

Donnellan and Luyendyk (1997-2001)

Raymond et al. (1996-2001)

W12

AirForce Seismic Stations (new)

Proposed TAM CGPS Network continues decadal-length times series at 4 sites

Network proposed in 2004 (Raymond et al.) is designed to measure glacioisostatic deformation in region most sensitive to testing models

TAMDEF

slide6

Picosat and UAV System Engineering (PAUSE)

Li-SoCl2 batteries

  • Magnetometer package is undergoing lab thermal testing (30 C to -60C)
  • Stratospheric balloon tests in October 2004
  • Components, software and architecture can be reused for GPS stations

Freewave

modem

magnetometer

single board

computer