GPS

DHS, NIST Make Progress on Protecting GPS
March 16, 2015

DHS, NIST Make Progress on Protecting GPS

A roof antenna for a GPS timing system. Photo by David Monniaux, Wikimedia Commons

Two agencies charged with helping protect America’s critical infrastructure are working on ways to safeguard GPS receivers, particularly those used to tap the signal for essential timing data.

The Department of Homeland Security (DHS) is building on its more recent, technically focused research to identify and mitigate risks.

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By Inside GNSS
Renewed Spectrum Fight Emerges between GPS, LightSquared at ABC Workshop
March 14, 2015

Renewed Spectrum Fight Emerges between GPS, LightSquared at ABC Workshop

Spectrum-related tensions reemerged during a workshop on Thursday (March 12, 2015) organized to gather feedback on a testing plan to help protect GPS receivers.

The plan is part of the GPS Adjacent-Band Compatibility (ABC) assessment — a wide-ranging effort to determine the power levels at which services operating in frequencies next those used by GPS and other GNSS systems can broadcast signals without causing interference to GPS signals.

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By Inside GNSS
GNSS Hotspots | March 2015

GNSS Hotspots | March 2015

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. NAVSTAR GETS THE AX
Seal Beach, California

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By Inside GNSS
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GNSS and Precision Farming

GNSS and Precision Farming

Dr. John Fulton, Ohio State University

Nowhere has the fact that GNSS can guide things besides military weapons and transport manifested itself more profoundly than in agriculture.

While Google and automotive manufacturers struggle to figure out how to put autonomous vehicles on the highway, farmers have been using GNSS for well over a decade to guide equipment through their fields — along with a host of other ag-related, site-specific applications.

Indeed, GNSS — along with an array of other high-tech resources — is transforming agriculture at an accelerating rate.

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By Inside GNSS
How does a GNSS receiver estimate velocity?

How does a GNSS receiver estimate velocity?

Equations 1 – 11

Q: How does a GNSS receiver estimate velocity?

A: Stand-alone single-frequency GNSS receivers represent the largest slice of the commercial positioning market. Such receivers operate mainly in single point position (SPP) mode and estimate velocity either by differencing two consecutive positions (i.e., approximating the derivative of user position) or by using Doppler measurements related to user-satellite motion.

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By Inside GNSS
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NOAA’s National Geodetic Survey (NGS) Geospatial Summit 2015
March 8, 2015

NOAA’s National Geodetic Survey (NGS) Geospatial Summit 2015

Arlington, Virginia

NOAA’s National Geodetic Survey (NGS) Geospatial Summit will be held at the Crystal City Hilton in Arlington, Virginia on April 13-14, 2015.

Registration is now open. Early registration ends March 13, 2015.

NGS will be hosting three events, each one providing a venue for NGS to share information about its products and services as well as hear from its customers across the public and private sectors.

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By Inside GNSS
UAV Want List (with GNSS Already on Board): A Coherent Regulatory Framework for Europe
March 5, 2015

UAV Want List (with GNSS Already on Board): A Coherent Regulatory Framework for Europe

Chris Blackford of Sky-Futures speaking at AUVSI’s Unmanned Systems Europe 2015. Peter Gutierrez photo

Just as you do when you get in your car, the UAS, UAV, drone, RPAS and even ROAV communities — who probably need to agree on an acronym — are beginning to take GNSS for granted. But presenters at the AUVSI Unmanned Systems Europe 2015 conference held Tuesday and Wednesday (March 3–4, 2015) in Brussels had little to say on the subject, to our great disappointment, even though virtually all of the vehicle/vessel systems under discussion use it and need it.

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By Inside GNSS
Simulator Manufacturer Flags Leap Second Issue

Simulator Manufacturer Flags Leap Second Issue

Graph showing the difference between UT1 and UTC. Vertical segments correspond to leap seconds. Source: Wikimedia Commons

Differences between BeiDou and GPS and Galileo in designation of a “day number” for the date of applying leap second later this year could cause problems for GNSS receiver manufacturers, according to UK-based simulator provider Racelogic.

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By Inside GNSS
FCC Issues New Rules on E911 Location Standards, Options Besides GNSS
February 27, 2015

FCC Issues New Rules on E911 Location Standards, Options Besides GNSS

New rules recently adopted by the Federal Communications Commission (FCC) to help emergency responders better locate wireless 911 callers highlight the role of GPS and GNSS technologies while boosting the use of alternative positioning technologies in indoor locations.

However, the new enhanced (11 (E911) rules, adopted January 29 and published on February 4, explicitly avoided a decision on the use of GNSS systems other than GPS.

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By Inside GNSS
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