Status Report : Assessment of Compatibility of Planned LightSquared Ancillary Terrestrial Component Transmissions in the 1526-1536 MHZ Band with Certified Aviation GPS Receivers
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Status Report : Assessment of Compatibility of Planned LightSquared Ancillary Terrestrial Component Transmissions in the 1526-1536 MHZ Band with Certified Aviation GPS Receivers

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  • Alternative Title:
    National Telecommunications and Information Administration (NTIA) letter enclosure 4 - 2012 January 25 - status report assessment of planned LightSquared (LSQ) ancillary terrestrial components (ATC) transmissions in 1526 to 1536 MHz
  • Creators:
    Huerta, Michael P.
  • Corporate Creators:
    United States. Department of Transportation. Federal Aviation Administration
  • Subject/TRT Terms:
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    United States
  • Corporate Publisher:
    John A. Volpe National Transportation Systems Center (U.S.)
  • Abstract:
    The Federal Aviation Administration (FAA) has worked with LightSquared since August

    2011 to evaluate the compatibility of certified aviation receivers with the planned

    LightSquared ancillary terrestrial component (ATCt) network using a signal broadcast in

    the 1526-1536 MHz band.

    The assessment in this report is based on FAA performance standards. Unlike most other

    GPS devices, certified aviation GPS receivers have interference rejection requirements

    specified by the FAA and harmonized internationally. Aircraft antenna characteristics

    are also specified. The use of these specifications precludes the need to individually test

    every aviation device, and allows the assessment to be accomplished through analysis

    which estimates the LightSquared interference present at the aircraft GPS receiver, and

    then compares that level to the specified rejection limits.

    To predict the interference at the aircraft, the FAA has developed a set of propagation

    models that build upon testing conducted by the mobile satellite services and cellular

    communications industries for terrestrial applications. Unfortunately, aircraft operate at

    altitudes where no significant research on propagation has been conducted. Addressing

    this gap has been the primary focus of the FAA and LightSquared activities though

    several technical issues remain unresolved, which would require additional resources.

    While variations in the FAA and LightSquared models affect the scope of impact, they do

    not affect our fundamental conclusions.

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