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Inside GNSS • March/April 2014

Who’s Your Daddy?

In this article, we will take a look at the various GNSS signals from the perspective of their cost-benefit tradeoffs. First, we’ll look at the evolution of consumer GPS architecture to date — where acquisition speed and sensitivity have been the main drivers of receiver architecture. That architecture has evolved rapidly to take full advantage of the characteristics of the GPS C/A code.

New Builds • February 11, 2014

Spirent Launches SimSAFE to Address GNSS Signal Vulnerability

Spirent Communications today (February 11, 2014) announced the introduction of Spirent
SimSAFE, a software solution that concurrently simulates legitimate GNSS
constellations and spoofed or hoax signals to evaluate receiver 
resilience and help develop counter-measures.

Spirent developed
the software in conjunction with Qascom. Based in Bassano del
Grappa, Italy, Qascom offers services and solutions for GNSS signal
security and authentication.

May 12, 2014 - May 23, 2014
Toulouse, France
February 17, 2014
Vienna, Austria
January 8, 2014

New BeiDou ICD Describes Second Civil Signal; Officials Describe Progress, Plans

At a news media conference in Beijing on the first anniversary of the BeiDou Navigation Satellite System (BDS) declaration of full operational capability (FOC) for its regional service, officials reported on the current performance of China’s GNSS system.

The BDS program also released two new technical documents, including an updated interface control document (ICD) that describes the second civil signal, B2I, and a “BDS Open Service Performance Standard (version 1.0).”

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.

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

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

December 16, 2013

Russians Consider IGS as Congress Moves to Limit GLONASS, Foreign GNSS Monitoring Stations on U.S. Soil

Lawmakers are poised to sharply limit the ability of foreign nations to own or control satellite system monitoring stations on U.S. territory, a rare show of congressional cooperation triggered by a Russian request to place stations supporting its satellite navigation system on American soil.

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