A: System Categories Archives - Page 128 of 199 - Inside GNSS - Global Navigation Satellite Systems Engineering, Policy, and Design

A: System Categories

January 25, 2013

GNSS Hotspots | January 2013

One of 12 magnetograms recorded at Greenwich Observatory during the Great Geomagnetic Storm of 1859
1996 soccer game in the Midwest, (Rick Dikeman image)
Nouméa ground station after the flood
A pencil and a coffee cup show the size of NASA’s teeny tiny PhoneSat
Bonus Hotspot: Naro Tartaruga AUV
Pacific lamprey spawning (photo by Jeremy Monroe, Fresh Waters Illustrated)
“Return of the Bucentaurn to the Molo on Ascension Day”, by (Giovanni Antonio Canal) Canaletto
The U.S. Naval Observatory Alternate Master Clock at 2nd Space Operations Squadron, Schriever AFB in Colorado. This photo was taken in January, 2006 during the addition of a leap second. The USNO master clocks control GPS timing. They are accurate to within one second every 20 million years (Satellites are so picky! Humans, on the other hand, just want to know if we’re too late for lunch) USAF photo by A1C Jason Ridder.
Detail of Compass/ BeiDou2 system diagram
Hotspot 6: Beluga A300 600ST

1. TIMING IS EVERYTHING
Washington, D.C.

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By Inside GNSS

GNSS and Ubiquity

Chris Rizos, University of New South Wales

GNSS is in a class of its own and the positioning/navigation/timing (PNT) technology of choice for most applications. Why wouldn’t we always use it?

It is affordable, it is a mature technology with many form factors, and its level of performance spans several orders of magnitude — millimeters to meters. There are a bewildering number of permutations of user equipment, augmentation solutions, processing algorithms, and operational procedures to choose from.

However. . . .

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By Inside GNSS
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Markets and Multi-Frequency GNSS

FIGURE 1: Proposal to have a single chip GNSS receiver with additional pins to allow for the inclusion of an additional radio

Q: What will limit the spread of multi-frequency GNSS receivers into the mass market?

A: To set the scene, we need to define our terms of reference. By multi-frequency we mean receivers that operate with navigation signals in more than just the standard upper L-band from about 1560–1610 MHz where we find GPS L1, Galileo E1, Compass B1, and GLONASS L1. The obvious additional frequency is the lower L-band, from about 1170 to 1300 MHz, where again the same four constellations have signals.

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By Inside GNSS

The GNSS Merry Go Round

The whole GNSS world should have a warm spot in its heart for centripetal forces.

After all, a centripetal force — in this case, gravity — is what keeps planets in rotation around our Sun and satellites, around the Earth.

Centrifugal force, of course, is what throws us off a merry-go-round or carousel. Centripetal force is what keeps us on board.

For those on a merry-go-round, the centripetal force is not gravity, but rather the tensile strength of our arms pulling us toward the center of rotation, at right angles to the motion of our seats.

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By Inside GNSS

No Time Like the Present for Europe in Asia

Peter Gutierrez

Galileo promoters have always tended to try to link the program to new jobs and economic growth, arguing that once Europe’s global satnav system is up and running, new services will be possible and opportunities for EU companies will abound.

Such arguments needed to be made, to bolster the chronically tenuous political support Galileo has garnered from the European Union (EU) powers-that-be and the chronic lack of faith among just about everybody in Europe’s ability to actually make the system fly.

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By Peter Gutierrez

More Than Money Worries

Navigation users may benefit from GPS modernization sooner than expected thanks to an apparent shift in the schedule of the modernized GPS ground control segment still under development.

The change means that full operational implementation of the new signals will come earlier in the delayed modernization of the operational control Segment (OCS).

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By Dee Ann Divis
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January 22, 2013

AFRL Selects Surrey Satellite US to Evaluate Small Satellite Approach to GPS

The Air Force Research Laboratory (AFRL) has selected Surrey Satellite Technology US LLC (SST-US), of Englewood, Colorado, to investigate cost reduction and augmentation of the current GPS constellation through the application of a small satellite approach.

AFRL has contracted with SST-US to identify and analyze how small satellites can improve aspects of GPS system performance, such as accuracy, coverage, and robustness at costs far below those of past procurements.

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By Inside GNSS

EGU General Assembly 2013: European Geosciences Union

The 2013 European Geosciences Union General Assembly and exhibition will take place in the Austria Center Vienna (ACV) from April 7 through April 12.

The event attracts more than 11,000 geoscientists from all over the world. The official language is English. The early registration deadline is March 13. The program will be available after March 25.

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By Inside GNSS

2013 Geospatial World Forum

The 2013 Geospatial World Forum and industry exhibition will be held at the Beurs – World Trade Center in the international port city of Rotterdam on May 13-16.

This year’s theme is "Monetizing Geospatial Value and Practices." The keynote speakers are Chris Gibson, vice president of Trimble and Mark Reichardt, president and CEO of the Open Geospatial Consortium (OGC).

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By Inside GNSS

United Nations/ Croatia Workshop on GNSS Applications

This five-day workshop is one of several sponsored by the Office for Outer Space Affairs of the United Nations in various European countries.  The workshops will give participants an overview of GNSS systems and applications with the aim of strengthening a network of national reference stations and promoting the interoperability of navigation, positioning and timing systems in the region.

The UN/Croatia workshop will take place on Baška, Krk Island on April 21-25, 2013.
It is free.

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By Inside GNSS
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