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The System

The System column from GPS World Magazine.


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The System: First IIF Satellite Speeds into Orbit   June 1, 2010

GPS spacecraft IIF-1 was set to be launched May 27 from Cape Canaveral Air Force Station in Florida. This first of a new generation of satellites will travel quickly — instead of taking several days to reach its orbital slot, the new satellite should make the journey in three-and-a-half hours....More>>

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Carrier-Phase Anomalies Detected on SVN-48   May 17, 2010

Anomalous behavior of the L1 C/A-code carrier phase has been detected on PRN07/SVN-48. The anomalies are sudden step-like changes of phase by about 10 degrees/5 millimeters. These steps are followed by negative steps of the same magnitude that restore the original phase time history. These...More>>

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The System: Galileo ICD, Free at Last   May 1, 2010

The European Commission (EC) has published an updated Galileo Open Service Signal-In-Space Interface Control Document (OS SIS ICD) giving technical specifications and performance expectations for the future system. Plus: SBAS WoesMore>>

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The System: Vistas from the Summit   April 1, 2010

“This is an event where one gets one’s goals for the next year.” Paul Verhoef, program director for satellite navigation programs of the European Commission, may have exaggerated for effect, and for the benefit of his audience and hosts at the Munich Satellite Navigation Summit in March. But...More>>

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The System: GLONASS Heaves Three Aloft   January 1, 2010

The Russian space agency Roscosmos launched a venerable Proton rocket carrying three GLONASS-M satellites into orbit on December 14. Each 3,000-pound satellite is designed to last seven years. They join a constellation numbering 19 satellites, although only 16 are healthy. PLUS: Loran and Galileo...More>>

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The System: Galileo Removes Manufacturing Barrier    December 1, 2009

With final satellite construction bids pending as this magazine goes to press, the Galileo program clarified a recent round of launch postponements and announced that the European Union (EU) will rescind its requirement for a special license to manufacture and sell Galileo receivers. Plus: GPS to...More>>

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The System: Galileo Slips, EGNOS Operates   November 1, 2009

Four Galileo in-orbit validation (IOV) satellites scheduled to launch next year have already missed their first pad date.The European version of Russia’s Soyuz rocket is now scheduled to carry the four IOV satellites into orbit in two launches in November 2010 and early 2011, as announced by...More>>

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The System: Glitches and Vulnerabilities   October 1, 2009

The first in a series of deviations from normal GPS signal broadcasts during September was noted by researches at the University of New Brunswick, among others around the globe, who found that normal signals from the L1 and L2 transmitters on the GPS satellite PRN01/SVN49 were unavailable for more...More>>

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The System: Compass Awry   August 1, 2009

One of the satellites in the Chinese domestic satellite navigation system, Beidou, is no longer in geostationary orbit and appears to have been abandoned.More>>

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The System: Can GLONASS Alleviate GAO Malaise?   July 1, 2009

The current GPS constellation of 30+ satellites provides a high level of availability, reliability, and accuracy to users. Centimeter-level accuracy requires the use of carrier-phase measurements and the resolution of associated integer ambiguities; success is a function of the number of satellites...More>>










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