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July 1, 2011

LightSquared GPS Interference Report and Recommendation to FCC Fuels the Fight

LightSquared submitted a 318-page report to the Federal Communications Commission (FCC) yesterday (June 30, 2011) on the months-long effort of a technical working group (TWG) to investigate the effects of the would-be cellular broadband company’s terrestrial transmitters on GPS receivers operating in an adjacent RF band.

Inside GNSS • July/August 2011

GPS Interference Testing

Interference can pose a threat to the reception of GNSS signals in a variety of ways. Even low-level signals have the potential to interfere with GNSS receivers, which require very high sensitivity for acceptable performance due to the extremely low received GPS signal power at the Earth’s surface.

Events • June 26, 2011

Summer Dreams: Case Western Wins Robotic Lawnmower Contest

A team from Case Western Reserve University in Cleveland, Ohio took home the top $15,000 prize and a special award for the most aesthetically pleasing cut in the three-day 2011 Robotic Lawnmower Competition held in Dayton, Ohio on May 31 through June 2.

The second place award of $10,000 went to Auburn University and Wright State University won the third place prize of $5,500.  

Ventures • June 30, 2011

USA Challenge Competition Seeks Satellite Navigation Apps

[Updated June 30] Lucky you - you have three extra days to submit your GNSS application idea to the USA Challenge! The extended deadline is midnight Sunday (Europe) or 3 P.M. (Pacific time) on July 3.

Right now, some team is hard at work in a basement, an office, a dorm room or a lab. They are about to come up with a new, useful and commercially viable idea for a satellite navigation application or location based service.

October 5, 2011 - October 6, 2011
Exton, Pennsylvania USA
Events • June 28, 2011

First Encounters: Asteroid MD 2011 Meets the GPS Constellation

A schoolbus-sized asteroid grazed the Earth's atmosphere around 1:00 P.M. (EDT)  on June 27. It was 7,600 miles (12,300 km) away at its closest point, at which time it veered away across the South Atlantic Ocean.

It actually passed through the GPS constellation, alerting us to the vulnerability of our vital PNT space vehicles. We can now add asteroids to the the list of GNSS collision risks that already includes other satellites and space debris.

June 28, 2011

U.S. Supreme Court to Weigh In on GPS Surveillance and the Fourth Amendment

On June 27, the Supreme Court decided to accept a 2005 Washington D.C. warrantless tracking case that illustrates how confusing GPS satellite positioning and the new technologies that follow, sense and link us are to judges and public alike. The case, United States v. Jones, will probably be heard during the October 2011 term.

June 25, 2011

Intermodulation Effects: Another Perspective on LightSquared Interference to GPS

Much of the research into the possible effects of the planned LightSquared cellular broadband transmissions near the GPS L1 band have focused on the saturation of the front end of GPS receivers caused by the high power of the terrestrial LightSquared base stations. In this article, an engineer with a long history in broadcast digital television takes a look at the likely effects on GPS receivers of third-order intermodulation products created by the LightSquared signals.

June 24, 2011

LightSquared Lays Out New GPS Plan for Skeptical House Members

Would-be cellular broadband company LightSquared promised a Congressional subcommittee Thursday (June 23, 2011) that it would scale back its proposed wireless system and help pay to find a way to mitigate the network’s adverse effects on users of the Global Positioning System.

June 24, 2011

Appropriators Cut $98 Million from FY12 GPS Program, Add $40 Million for Block IIF

The House Appropriations Committee approved its version of the Fiscal Year 2012 (FY12) Department of Defense Appropriations Act (H.R.2219) on June 14, cutting funds from the next-generation GPS space (GPS III) and operational control (OCX) segments, while adding money to the current GPS IIF satellite allocation.

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