United States Department of Transportation
i
Assessment of LightSquared Terrestrial Broadband System Effects on GPS Receivers and GPS-dependent Applications
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2011-06-01
[PDF-5.91 MB]
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Abstract:The Executive Steering Group (ESG) of the National Executive Committee (EXCOM) for
Space-Based Positioning, Navigation, and Timing (PNT) directed the National Space-Based
PNT Systems Engineering Forum (NPEF) to conduct an assessment of the effects of
LightSquared’s planned deployment of a terrestrial broadband network to Global Positioning
System (GPS) receivers and GPS-dependent systems and networks. The NPEF was tasked to
engage with the LightSquared Working Group established at the direction of the Federal
Communications Commission (FCC), and the GPS manufacturing and applications communities
through relevant industry bodies (e.g., the U.S. GPS Industry Council and RTCA, Inc.). The
NPEF investigated and determined effects due to interference to a selected set of GPS receivers
in operationally relevant scenarios from LightSquared’s planned deployment for Ancillary
Terrestrial Component (ATC) transmitters to utilize the mobile-satellite service (MSS) bands as
follows: i) 1550.2 – 1555.2 MHz for Phase 0; ii) 1526.3 – 1531.3/1550.2 – 1555.2 MHz for
Phase 1; and iii) 1526 – 1536/1545.2 – 1555.2 MHz for Phase 2. While the NPEF tasks were
conducted in coordination with all involved entities to the extent possible, the NPEF report is
considered to be an independent assessment. The contents of this Report consist of a compilation
of findings from nine subtasks along with appendices that include summaries of all of the
detailed test data and results collected over the last four months via a series of laboratory and
field environment testing of GPS receivers. This Report is a technical summary of the work
conducted during this effort and includes specific recommendations and responses to questions
as requested by the EXCOM.
Based on analysis described in the main body of this Report, the NPEF has developed the
following recommendations for ESG consideration.
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