Time to improve GPS accuracy

Correcting for a time lag built into current Global Positioning System satellites can significantly enhance the accuracy of highly detailed GPS observations that are increasingly used to study Earth systems. Choi et al. report that existing satellite techniques often slightly misjudge the location of ground changes, such as seismic activity, ice sheet flow, and volcanic deformation, because researchers used the wrong time delay in the GPS satellites.

The authors show that the orbit period varies for each satellite and often differs considerably from what scientists have assumed since the GPS constellation was begun in the late 1970s.

The researchers examined, for example, a GPS dataset from the well-observed 2003 San Simeon earthquake and found that high-precision (1 Hertz) GPS data needed to be corrected by nine seconds. They suggest that the improved processing technique would greatly reduce current error rates and make it possible to more accurately measure dynamic ground motion across the globe.

Title: Modified sidereal filtering: Implications for high-rate GPS positioning

Authors: Kyuhong Choi, Andria Bilich, Kristine M. Larson, Penina Axelrad, University of Colorado, Boulder, Colorado, USA.

Source: Geophysical Research Letters (GL) paper 10.1029/2004GL021621, 2004

Media Contact

Harvey Leifert AGU Journal Highlights

More Information:

http://www.agu.org

All latest news from the category: Information Technology

Here you can find a summary of innovations in the fields of information and data processing and up-to-date developments on IT equipment and hardware.

This area covers topics such as IT services, IT architectures, IT management and telecommunications.

Back to home

Comments (0)

Write a comment

Newest articles

Detecting pathogens faster and more accurately by melting DNA

A new analysis method can detect pathogens in blood samples faster and more accurately than blood cultures, which are the current state of the art for infection diagnosis. The new…

Black hole at center of the Milky Way resembles a football

Researchers revealed that the black hole’s spinning speed could provide an ‘incredibly powerful kick’ to surrounding matter. The supermassive black hole in the center of the Milky Way is spinning…

High resolution techniques reveal clues in 3.5 billion-year-old biomass

Research team analyses organic material from the early Earth tracing its origin and composition. To learn about the first organisms on our planet, researchers have to analyse the rocks of…

Partners & Sponsors