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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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    Details:

    • 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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