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Inside GNSS • January/February 2014

Multi-GNSS Monitoring

A common refrain in the world of GNSS is the desire for “interoperability,” the use of signals from multiple systems without a decline — and potentially even an improvement — in the quality of results.

Achieving this depends on large part in establishing comparable parameters — particularly the geodetic references and timing systems — among the GNSSs along with a dense network of ground reference stations that can provide continuous, precise monitoring of satellites’ orbital positions.

Human Engineering • January/February 2014

Marc Weiss' Compass Points

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GNSS Event that most signifies for you that GNSS has “arrived”

GNSS Solutions • January/February 2014

Ionospheric Scintillation

Ionospheric scintillations are rapid temporal fluctuations in both amplitude and phase of trans-ionospheric GNSS signals caused by the scattering of irregularities in the distribution of electrons encountered along the radio propagation path. The occurrence of scintillation has large day-to-day variability. The most severe scintillations are observed near the poles (at auroral latitudes) and near the equator (within ± 20 degrees of geomagnetic equator).

Inside GNSS • January/February 2014

Proposal for U.S. eLoran Service Gains Ground

Trying to revive a years-dead federal program is usually the kind of hopeless task that even Sisyphus wouldn’t touch.

But determined supporters of eLoran are gaining ground in their effort to resurrect the cancelled radio-navigation network and, propelled by new worries over GPS jamming, they appear poised push the issue through.

Human Engineering • January/February 2014

Marc Weiss

SIDEBAR: Marc Weiss' Compass Points

In a career spanning nearly the entire history of GNSS-enhanced metrology, Marc Weiss has been a key participant in projects that laid the foundation for accurate synchronization of atomic clocks around the world.

Inside GNSS • January/February 2014

Reaching for the STARx

GNSS modernization includes not only the global coverage capabilities of GPS, GLONASS, Galileo, and BeiDou, but also regional GNSS enhancement systems such as Japan’s Quasi-Zenith Satellite System (QZSS), the Indian Regional Navigation Satellite System (IRNSS), and the European Geostationary Navigation Overlay Service (EGNOS).

Inside GNSS • January/February 2014

IGS-MGEX

January 14, 2014

India Certifies GAGAN for En Route and NPA Flight Operations

India's Directorate General of Civil Aviation (DGCA) provisionally certified the nation's Satellite Based Augmentation System (SBAS) — the GPS Aided Geo Augmented Navigation (GAGAN) system — to RNP0.1 (Required Navigation Performance, 0.1  Nautical Mile) service level on December 30, 2013.

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