Archives

SBAS Crashing

April 22, 2010 - By

It’s been a tough couple of weeks for SBAS (Satellite-Based Augmentation System), namely the USA’s WAAS program and India’s GAGAN program. WAAS and GAGAN have taken big hits recently that threaten the integrity of the programs. Both events were totally unexpected and are causing disruptions of GPS correction services. read more

This article is tagged with and posted in Newsletter Editorials, Opinions, Survey, Survey Scene

World Domination: The Sequel

April 19, 2010 - By

Perhaps we should call this The Interquel rather than The Sequel, as the latter will take place September 23 in Portland, Oregon, during the ION GNSS 2010 Conference. In January, 12 brave individuals joined me in San Diego to see if this thing would work at all.  It did!  The exercise revealed many adjustments needed to the game, but overall,... read more

This article is tagged with and posted in All Blogs, Editor's Wide Awake Blog, GNSS

Aeroflex Introduces Portable Positional Simulator for GPS/Galileo Receivers

April 12, 2010 - By

A-Aeroflex has introduced the GPSG-1000, a portable GPS and Galileo positional simulator. The GPSG-1000 is lightweight and configurable. It fills a gap in the market by providing a low-cost 12-channel test set that creates three-dimensional simulations, A-Aeroflex said. read more

This article is tagged with and posted in Simulators & Tools

Solar Activity and RF ID Technology

April 7, 2010 - By

It’s time to touch on the solar activity subject again, as there was an event earlier this week and rumors began to fly. The mainstream press jumped on a story back in January when the first solar flare of Solar Cycle 24 occurred. read more

This article is tagged with and posted in Newsletter Editorials, Opinions, Survey, Survey Scene

Innovation: GPS by the Numbers

April 1, 2010 - By

A Sideways Look at How the Global Positioning System Works
In his 200th Innovation column, Contributing Editor Richard Langley takes a look at GPS by the numbers, getting a sense of how GPS works by examining the key numbers that govern its remarkable capabilities, from zero to pi and beyond. read more

This article is tagged with and posted in GNSS, Innovation

Mobile World Congress 2010: Planet of the Apps

April 1, 2010 - By

It’s that time of year, around Valentine’s Day, when most of the who’s who in the mobile phone industry meet at the Mobile World Congress. I have been attending this event for nearly 15 years, and have seen the location change from Cannes to Barcelona, and the name change from GSM World Congress to 3GSM World Congress to Mobile World Congress. At the same time, the number of mobile phone users shot up from the millions to the billions. A new feature this year was the App Planet hall. The attendance of 47,000 was only marginally down from the 49,000 visitors in 2009, making it still a very busy a event, with no sign of the recession compared to other shows I’ve seen. It’s still the best place to meet companies in the mobile space — I met 25 in three days, as well as running into ex-colleagues and contacts who, like me, have been attending for years. read more

This article is tagged with , and posted in The Business

Low-Frequency Vibrations

April 1, 2010 - By

Detection with High-Rate Data and Filtering
Multipath makes it difficult to detect very low-frequency structural vibrations, ranging from 0.05 to 1 Hz, important in characterizing dynamic loads and determining safe structural lifetimes. The authors have developed a phase-residual method for use with very high-frequency data to distinguish receiver noise, multipath, and the periodic displacements that are most structurally significant. The methodology can apply to bridges, tall buildings, and towers. read more

This article is tagged with and posted in Built Structures

Out in Front: What’s in a Number?

April 1, 2010 - By

Computers killed a trusty companion of my teenage years. That is, after those proto-computers known as pocket calculators knocked him out and left him unconscious on the cooling floor. But I come to praise my slide rule, not to bury him. With computers, it’s just numbers in, numbers out. Maybe that high-tech approach led both the GPS Wing and the Government Accountability Office into trouble with constellation gaps. read more

This article is tagged with , and posted in From the Editor, GPS Modernization