Mobile Broadband Network Causes GPS Interference

A new set of government tests showed that LightSquared's proposed mobile broadband network disrupted the signal strength to all GPS devices in the test area, dealing another setback to the company's startup plans.

Some devices lost signal strength while others were knocked out completely. For example, the government tests found that General Motors Co.'s OnStar system saw a "significant degradation of service" on most receivers tested.

The government tests will increase pressure on the Federal Communications Commission to slow down approval of LightSquared's network.

A separate Federal Aviation Administration-commissioned study found that "GPS operations below 2000 feet (elevation) would be unavailable over a large radius of metro (areas)" for aircraft.

Learn more from the Wall Street Journal.

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