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Col. Dave Madden Looks Back, and Forward into GPS Future

July 27, 2010 - By

As he retires from the Air Force, Col. Dave Madden gives a status update on GPS modernization and outlines four steps the GPS Wing is taking to ensure worldwide PNT services are not interrupted during modernization, exploring a more robust means of ensuring compatibility, and becoming more involved in the development, integration, and testing of new military and possibly civil user equipment. He also announces the set-up of a GPS Directorate within the Department of Defense in October. read more

This article is tagged with , , and posted in Defense PNT Newsletter, Newsletter Editorials

Get It Surveyed: ESRI Surveying and Engineering GIS Summit

July 22, 2010 - By

I believe that if you attend the ESRI SEGS and UC conferences just one time, your vision of surveying, engineering, construction, and GIS will change forever. I know it sounds like an advertisement from ESRI, but I think my pitch is even better than theirs. Seriously though, there are so many people presenting so many different ideas, and they are all related to the kind of geographic data you work with on a regular basis. read more

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

Kick It in and Push!

July 13, 2010 - By

By Alan Cameron The Elephant Charge (“Dust, Sweat, and Gears”), an annual off-road motorsport charity event, brings together competitors, their families, and supporters for a wilderness weekend of GPS-driven fun and frenzy in the Zambian bush. I’m for fun, but I always wince when I see folks tearing up habitat in the name of saving it. Elephant Charge 2010 seeks... read more

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

Out in Front: Welling Up

July 1, 2010 - By

One of the first industrial uses of GPS came in survey and seismic exploration for offshore oil, as evidenced by the cover story of this magazine’s September 1992 issue. A salient passage from that 18-year-old “Quality Control For Differential GPS in Offshore Oil and Gas Exploration” article: “Users are in danger of being mesmerized by the apparent simplicty of the technology and abandoning quality-control principles . . . . The key to routine operations is rigorous real-time quality control.” Eerily, among the companies acknowledged for support of that article was BP Exploration. read more

This article is tagged with and posted in From the Editor, Natural Resources

Innovation: Better Weather Prediction Using GPS

July 1, 2010 - By

Water Vapor Tomography in the Swiss Alps
A team of Swiss researchers is using data from a network of GPS receivers and the technique of tomography to obtain profiles of how moisture is distributed with height, which might lead to better weather forecasts. read more

This article is tagged with , and posted in From the Magazine, Innovation, Natural Resources, Remote Sensing

The System: GPS L5, the Real Stuff

July 1, 2010 - By

The L5 signal of the new Block IIF satellite shows a very favorable signal strength (Fig. 1), which is somewhere in between the L1 and L2C signal strength for the employed antenna and slightly higher than that of the GIOVE-A/B satellites. While the L5 test signal of the second-last Block IIR-M satellite (PRN1/SVN49) is transmitted through a narrow beam antenna and shows a steep variation with elevation angle, the new satellite exhibits an almost constant flux irrespective of the boresight angle. read more

This article is tagged with and posted in The System

GNSS Vulnerability and Alternative PNT

July 1, 2010 - By

A group working under the auspices of the Federal Aviation Administration (FAA) Navigation Services Directorate recently prepared a study assessing non-GNSS navigation system architectures to provide alternate positioning, navigation, and timing (APNT) services for aviation users, to mitigate GNSS vulnerability to radio frequency interference (RFI). The APNT architecture would be based on selected elements of today’s terrestrial navigation network, possibly upgraded, plus new elements anticipated for the 2025 timeframe. read more

This article is tagged with and posted in Aviation

Letters to the Editor

July 1, 2010 - By

Our readers respond to the cover features in the May and June issues: the two-part special the "Origins of GPS" and Richard Langley's look at "GPS by the Numbers." read more

This article is tagged with and posted in From the Editor