July 2011, Vol. 238 No. 7


New Proposed 4G Satellite Service Raises Questions About GPS Interference

Stephen Barlas, Washington Editor

A critical report from a Federal Communications Commission advisory committee on June 30 was the latest hitch in the plans of a company called LightSquared to offer new 4G wireless service to broadband users.

LightSquared would share some of the broadband spectrum used by global positioning system (GPS) service providers, which has caused users of GPS services, such as pipeline and underground construction companies, to worry about interference with their mapping efforts. Earlier this year, the FCC gave LightSquared conditional approval to use the 10 Mhz spectrum it owns if the interference problem could be solved.

The report from the Global Positioning System Industry Council asserted that LightSquared planned operations in the 10Mhz spectrum could negatively affect 500 million GPS receivers used by public safety agencies, construction companies and others. That report followed by one week approval by the House Appropriations Committee of an amendment which would allow FCC approval in fiscal 2012 only if interference issues are settled. FCC Chairman Julius Genachowski has supported the LightSquared application because it will create jobs and provide new broadband service in rural areas especially via use of spectrum that is underused.

On the heels of the advisory committee report, LightSquared submitted to the FCC proposed changes to its operational plan which would allow it to get up and running now while the interference issue is settled, hopefully by 2015, the date the company originally expected to have full service in full swing. This short-term solution involves using an alternative block of spectrum located further away from GPS frequencies and reducing its base station power by more than 50%. LightSquared has argued that the interference problems are the result of “the GPS device manufacturer’s decision over the last eight years to design products that depend on using spectrum assigned to other FCC licensees.”


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