GNSS

USAF to test increased GPS signal power Jan. 25

January 24, 2017By

Beginning Wednesday, Jan. 25, Air Force Space Command (AFSPC) will conduct a limited-duration test implementing an increase of the Ll C/A power level on the GPS Block IIR-M and llF satellites — a total of 19 satellites. The C/A power will remain within IS-GPS-200-H specifications, and the power increase is not expected to increase the noise floor by more than... read more

Galileo clock anomalies under investigation

January 19, 2017By
Rubidium atomic clock, or RAF.

The European Space Agency (ESA) issued a press release addressing the Galileo clock failures reported Jan. 18. GPS World Innovation editor Richard Langley provided the following summary of the satellites and clocks involved, based on information we have received to date. 5 satellites affected: 3 IOVs, 2 FOCs Total of 10 failures; 1 fixed; so 9 continuing failures 5 masers... read more

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Qualcomm Research: Robust positioning from visual-inertial and GPS

Figure 2: Part of the walk trajectory, passing through a building, where GPS is unavailable.

Presented at ION GNSS+, September 2016 GPS positioning in urban scenarios is challenging because of large numbers of non-line-of-sight outlier measurements. We propose a robust positioning algorithm that combines GPS observations with visual-inertial odometry information to handle such outliers. We demonstrate the effectiveness of our algorithm in a simulation scenario with close to 80-percent outliers. In experiments in a mild... read more

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Clocks fail on some Galileo satellites, backups working

January 18, 2017By
Passive hydrogen maser atomic clock of the type flown on Galileo, accurate to one second in three million years. (Photo: ESA)

Clocks have failed onboard several Galileo satellites in space, reports Phys.org, a web-based science, research and technology news service. The cause of the failure is being investigated, European Space Agency director general Jan Woerner told journalists in Paris on Wednesday. Each Galileo satellite has four atomic timekeepers — two rubidium and two hydrogen maser. Three rubidium and six hydrogen maser clocks are not... read more

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Indian government warns airlines to use GAGAN

January 17, 2017By

The government of India has warned domestic airlines of “consequences” if they do not use GAGAN, the state’s GPS-Aided Geo Augmented Navigation system, reports the Mumbai Mirror. The warning came during a meeting called by the Directorate General of Civil Aviation (DGCA) in December with all stakeholders, including the airlines. Most aircraft registered in India are still not equipped with... read more

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Raytheon completes qualification testing of GPS launch and checkout system

January 17, 2017By

Raytheon reached another milestone in developing the GPS Next-Generation Operational Control System, known as GPS OCX, with the completion of the factory qualification test of the Launch and Checkout System (LCS). GPS OCX will enable dramatically increased performance and security of the GPS system that benefits millions of people worldwide. Raytheon tested 74 OCX segment requirements at its Aurora, Colorado, factory in... read more

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FCC seeks public comments on receivers using Galileo signals in US

January 17, 2017By

The Federal Communications Commission (FCC) is inviting public comments on the European Commission’s request for a waiver of licensing requirements applicable to Galileo receivers in the U.S. Comments are due Feb. 21, 2017. If the waiver is approved, Galileo-capable receivers won’t need to be licensed in the U.S. Right now, FCC rules require that receivers operating with non-U.S. licensed space stations... read more

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January issue: All the news that fits…

January 15, 2017By
nytimes-logo-news

We have a finite number of pages to bring you each month, one might say a tightly controlled number. That number has never easily accommodated the quantity of fresh, relevant GNSS and PNT news and technical material that emerges each month. The pace of your developments is too fast with which to keep up! This month, a case in point.... read more

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