Reporting from Kansas City, Mo. — Early tests for a revolutionary teaming of ground- and satellite-based antennas for a wireless broadband network suggest that it could foul up GPS and other signals.
Preliminary test results released this week could set back plans for LightSquared Inc. of Reston, Va.
Garmin and others in the satellite-guided navigation industry have been warning that LightSquared's plan poses a threat to global positioning system devices.
A LightSquared executive conceded that the tests indicated that at some frequencies and power levels the company's technology could interfere with other signals. But he said adjustments could be made to safely bring the service to market.
"There are still ways we can coexist," said Jeff Carlisle, a LightSquared vice president.
The GPS industry saw the testing as more damning.
"There is no viable technical fix," said James Kirkland of GPS maker Trimble Navigation.
An official working with the organization overseeing the testing — the National Coordination Office for Space-Based Positioning, Navigation and Timing — said the science was not yet clear on how vexing the radio interference problems might ultimately prove.