评估光平方地面宽带系统对gps接收机和gps依赖性的影响

NationalSpace-BasedPNTExecutiveSteering(rroup FROM: SUBJECT: AssessmentofLightSquared TerrestrialBroadbandSystemEffectsonGPSReceivers andGPS-dependentApplications 1.OnbehalfoftheNationalExecutive Committee (EXCOM)forSpace-BasedPositioning,Navigation andTiming(PHI),the NationalSpace-BasedPNTSystemsEngineering Forum(NPEF)conducted an independent assessmentofthe effectsofLightSquared's planneddeploymentofa terrestrialbroadbandnetwork to Global PositioningSystem(GP S)receiversandGPS-dependentsystemsand networks. 2.Based on theNPEF'stesting and analysis, the National Spaced-BasedPN TExecutiveSteering Group(S SG)recommendsthat the FederalCommunicationCommission(FCC)rule that LightSquaredcannotcommencecommercial services per its planned deploymentfor terrestrial operations in the 1525 - 1559MHzMobile-SatelliteService(MSS)Band dueto harmful interference toGPSoperations. 3.Through theEXCOMandtheESG,the participating agencies arecommittedto coordinatewith thc NTIAand theFCCto test and evaluate the feasibilityofalternative signalconfigurations, and to discusshowthe recent testsofrepresentative Ancillary TerTestrialComponent(ATC)equipmentmight inform currentFCCATCMSSL-band authorizations. 4.The classified and redacted versionsoftheNPEFReport are provided for submission to theFederalCommunicationsCommission.Ifyou have any questionsorconcerns, please contactMr. Anthony Russo, Director, National Space-BasedPNTCoordination Office (CO)atAnthony.Russo!@,pnt.govor(202) 482-5809. TERIM. TAKAIESGCo-ChairDepartmentofDefense JOELM.SZABATESGCo-ChairDepartmentofTransportation 2 Attachments:1.ClassifiedNPEFReport2.RedactedNPEFReport(for public release) Assessment of LightSquared Terrestrial BroadbandSystem Effects on GPS Receivers andGPS-dependent Applications Prepared By: National Space-Based Positioning, Navigation, and TimingSystems Engineering Forum (NPEF) The views expressed in this paper are those of the authors and do not reflect the official policy orposition of the United States Air Force, Department of Defense, or the U.S. Government. DISTRIBUTION STATEMENT A: Approved for public release; distribution unlimited DISTRIBUTION STATEMENT A: Approved for public release; distribution unlimited Executive Summary The Executive Steering Group (ESG) of the National Executive Committee (EXCOM) forSpace-Based Positioning, Navigation, and Timing (PNT) directed the National Space-BasedPNT Systems Engineering Forum (NPEF) to conduct an assessment of the effects ofLightSquared’s planned deployment of a terrestrial broadband network to Global PositioningSystem (GPS) receivers and GPS-dependent systems and networks. The NPEF was tasked toengage with the LightSquared Working Group established at the direction of the FederalCommunications Commission (FCC), and the GPS manufacturing and applications communitiesthrough relevant industry bodies (e.g., the U.S. GPS Industry Council and RTCA, Inc.). TheNPEF investigated and determined effects due to interference to a selected set of GPS receiversin operationally relevant scenarios from LightSquared’s planned deployment for AncillaryTerrestrial Component (ATC) transmitters to utilize the mobile-satellite service (MSS) bands asfollows: i) 1550.2 – 1555.2 MHz for Phase 0; ii) 1526.3 – 1531.3/1550.2 – 1555.2 MHz forPhase 1; and iii) 1526 – 1536/1545.2 – 1555.2 MHz for Phase 2. While the NPEF tasks wereconducted in coordination with all involved entities to the extent possible, the NPEF report isconsidered to be an independent assessment. The contents of this Report consist of a compilationof findings from nine subtasks along with appendices that include summaries of all of thedetailed test data and results collected over the last four months via a series of laboratory andfield environment testing of GPS receivers. This Report is a technical summary of the workconducted during this effort and includes specific recommendations and responses to questionsas requested by the EXCOM. Based on analysis described in the main body of this Report, the NPEF has developed thefollowing recommendations for ESG consideration. Recommendation 1:LightSquared should not commence commercial services per its planneddeployment for terrestrial operations in the 1525 – 1559 MHz Mobile-Satellite Service (MSS)Band due to harmful interference to GPS operations. Test results of the LightSquared Phase 0, Phase 1, and Phase 2 deployments of ATC transmittersutilizing the MSS band (1550.2 – 1555.2 MHz for Phase 0, 1526.3 – 1531.3/1550.2 – 1555.2MHz for Phase 1, and 1526 – 1536/1545.2 – 1555.2 MHz for Phase 2) have demonstrated thereare significant detrimental impacts to all GPS applications assessed as part of this NPEF effort.These impacts encompassed both US Government and commercial GPS applications. Thepotential degradation of GPS operation due to LightSquared emissions was further characterizedvia simulation that showed that completion of the network of high-powered base stationsenvisioned by LightSquared wo