Follow-on Assessment of LightSquared Ancillary Terrestrial Component Effects on GPS Receivers
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Follow-on Assessment of LightSquared Ancillary Terrestrial Component Effects on GPS Receivers

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      National Telecommunications and Information Administration (NTIA) Executive Committee (EXCOM) letter enclosure 3 - 2012 January 18 - National Space-Based Positioning, Navigation and Timing (PNT) Systems Engineering Forum (NPEF) report to National Telecommunications and Information Administration (NTIA) follow-on assessment of LightSquared (LSQ) ancillary terrestrial components (ATC) effects on GPS receivers
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      The National Executive Committee (EXCOM) for Space-Based Positioning, Navigation, and Timing (PNT) tasked the National Space-Based PNT Systems Engineering Forum (NPEF) to conduct an assessment of the effects of LightSquared’s planned deployment of terrestrial broadband systems on GPS receivers.1 In accordance with the stated task, the NPEF focused on receivers supporting applications categorized as “General Location/Navigation” and on the first phase of LightSquared’s deployment, which uses a single 10 MHz portion of spectrum (1526 – 1536 MHz designated as ‘10L’) for Ancillary Terrestrial Component (ATC) transmissions. “Cellular” devices were tested by the National Telecommunications and Information Administration (NTIA) and “Certified Aviation Receivers ” were analyzed by the Federal Aviation Administration (FAA). These results will be published in a separate report. Other categories of receivers were tested, and LightSquared handset transmissions in the band above GPS L1 from 1627.5 – 1656.7 MHz were simulated as permitted by the tasking. No further testing of the 10 MHz signal in the upper band (1545.2 – 1555.2 MHz designated as ‘10H’) was conducted. Results documented in NPEF Report2, Technical Working Group (TWG) Report3 and the Radio Technical Commission for Aeronautics (RTCA) report4 demonstrate that operations in the ‘10H’ band will significantly degrade or deny GPS for all categories of devices. No proposed mitigation filters or devices were available for this test activity.
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