GNSS

Disruption in Australia Traced to User Equipment

May 14, 2014By

User equipment incorrectly interpreting data from a satellite set “unhealthy” led to an apparent constellation outage for roughly 1,000 fleet vehicles across Australia in April. The problem was traced to the way a GPS/telecomm chip reacted to an extended navigation test aboard SVN-49, having to do with the recently launched IIF satellite, SVN-64. Although SVN-49 was set unhealthy at the... read more

GPS IIF-6 Launch Delayed until Friday Night

May 14, 2014By

Update: The launch of the GPS IIF-6 satellite has been delayed one day due to bad weather. Another GPS IIF satellite is expected to lift off aboard a United Launch Alliance Delta 4 rocket from Cape Canaveral at 8:08 p.m. EDT May 15 at the opening of an 18-minute launch window. The satellite, designated GPS IIF-6 and built by Boeing,... read more

Next Galileo Satellites Arrive in French Guiana

May 12, 2014By
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The first two Galileo Full Operational Capability (FOC) satellites arrived safely at a clean room in Kourou, French Guiana, at 20:00 on Wednesday, May 7, in preparation for launch this summer. Named “Doresa” and “Milena,” the two Galileo FOC satellites arrived at the Félix Éboué international airport in French Guiana at 02:00 local time. They spent the day in an... read more

Innovation: Reducing the Jitters

May 1, 2014By
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How a Chip-Scale Atomic Clock Can Help Mitigate Broadband Interference
Small low-power atomic clocks can enhance the performance of GPS receivers in a number of ways, including enhanced code-acquisition capability that precise long-term timing allows. And, it turns out, such clocks can effectively mitigate wideband radio frequency interference coming from GPS jammers. We learn how in this month’s column. read more

The System: GLONASS Fumbles Forward

May 1, 2014By
GLONASS PLOT from the Roscosmos GLONASS Information-Analytical Centre, showing the 12-hour outage, with full service eventually restored on April 2.

Two April Disruptions Furnish Fodder for Multi-GNSS Receivers and Alternative PNT In an unprecedented total disruption of a fully operational GNSS constellation, all satellites in the Russian GLONASS broadcast corrupt information for 11 hours, from just past midnight until noon Russian time (UTC+4) on April 2 (or 5 p.m. on April 1 to 4  a.m. April 2, U.S. Eastern time).... read more

GNSS Backup Delivers 5-Meter Accuracy

April 30, 2014By

The North Sea fairly boils with GNSS activity recently. Trials of the eLoran back-up for GNSS, Galileo maritime trials, Brad Parkinson’s Protect, Toughen, and Augment sermon at the European Navigation Conference in Rotterdam, and also at that conference, the dramatic release of news concerning an even newer Loran system, enhanced differential Loran, that not only backs up GNSS in the... read more

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ESA International Summer School Set for July

April 29, 2014By

The ESA Summer School is scheduled for July 21-31, at the Campus of the Technical University of Ostrava, Czech Republic. The school provides attendees with a comprehensive overview of satellite navigation, starting from the various GNSS, the signals, the processing of the observations in a receiver, and finally determining the position-navigation-time (PNT) solution. Lab work will be carried out to... read more

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DOD Announces Start of Civil Navigation Message Broadcasting

April 29, 2014By

The Department of Defense announced that U.S. Air Force Space Command will begin broadcasting Civil Navigation (CNAV) messages on all operational GPS satellites capable of transmitting the L2C and L5 signals. L2C and L5 are the first of several new civil capabilities being added to GPS as part of the GPS modernization program announced in 1999. The L2C signal is... read more

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