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DOT: Not So Fast, LightSquared

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Key Takeaways:

  • Department of Transportation officials, following tests by the FAA and Department of Defense, confirmed that LightSquared's 4G broadband technology significantly interferes with the majority of GPS receivers, including critical aviation safety systems like TAWS.
  • These findings directly contradict LightSquared's earlier claims of minimal interference and raise serious concerns about dangerous disruption to aviation safety.
  • Even after LightSquared proposed using a different portion of satellite spectrum, subsequent tests still indicated harmful interference with most general-purpose GPS receivers and flight safety systems.
  • LightSquared's CEO disputes these conclusions, blaming the GPS devices themselves for the interference and asserting that the company has taken extensive measures to address a problem it believes it did not create.
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Despite bold predictions by LightSquared that the firm’s proposed mobile satellite service would soon win FCC approval, Department of Transportation officials on Wednesday said the company’s 4G broadband technology does indeed interfere with “the majority” of global positioning system receivers and poses dangerous disruption to aviation safety systems.

The findings, announced after recent testing by the FAA and Department of Defense, throw into serious doubt claims by LightSquared that its ground tower network would interfere only with a limited number of GPS receivers, and not high-performance aviation equipment. The DOT also said the LightSquared network interferes with TAWS, which obtains its position data from GPS. Over the next several weeks, the analysis of the findings will be completed and a final report will be sent to the FCC, said Transportation Department officials.

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