Flight Training - October 2011 - 21

LightSquared blames ‘legacy’ GPS for interference
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proposed mobile network has raised widespread concerns about interference with GPS signals relied on by aviation and other users, has responded to its critics with a report that said GPS receivers must do a better job of “rejecting” other signals. In the report, submitted to the Federal Communications Commission after five months of analysis by a working group convened to study the problem, LightSquared acknowledged that its planned use of electromagnetic spectrum would “adversely affect a significant number” of “legacy GPS receivers.”

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However, LightSquared disowned responsibility for the interference, arguing that the receivers’ designs were the cause of the problem. “The reason for this is not because LightSquared would be improperly transmitting in the GPS band. Rather it is because legacy GPS receivers do not adequately reject transmissions from base stations operating in the adjacent frequency band because the GPS receivers have been deliberately or, sometimes, inadvertently, designed or manufactured with the assumption that there would be no adjacent-band terrestrial transmissions—ignoring regulations first adopted in 2003 that permit such transmissions,” it said in the report. AOPA and many other industry groups continue to speak out against the proposal, saying it puts at risk billions of taxpayer dollars already spent by the federal government to develop the GPSbased Next Generation Air Transportation System (NextGen).

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Flight Training - October 2011

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