assessment of compatibility between ultrawideband devices 在超宽带设备的兼容性评估

《assessment of compatibility between ultrawideband devices 在超宽带设备的兼容性评估》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、AssessmentofCompatibilityBetweenUltrawidebandDevicesandSelectedFederalSystemsMay22,2001PaulC.Roosa,Jr.NationalTelecommunications&InformationAdministrationPhone:202-482-1559proosa@ntia.doc.govWhatAreUltrawideband(UWB)Devices?Radiocommunicationdevicesthattransmitnanosecond&shorterdirectcurrentpuls

2、es.Theyproduceverywidespectra,perhapsontheorderofseveralGigahertz!Theircenterfrequencyisdeterminedbythetunedcircuitsfollowingthepulsingcircuit.Theycanbeuseddirectlyasradarandsensingdevices.Theycanbemodulatedbyvaryingtheinterpulseperiodorthephaseofthepulse,withmodulatingsignalspotentiallyapproach

3、inghundredsofMegahertz.TheirbandwidthISNOTafunctionofthemodulationappliedtothesignal.THEPROBLEM100kHz10MHz1GHzEmissionBandwidthforOneTypeofUWBTransmitter700MHz4GHzBACKGROUNDFebruary-May98–ThreeCompanies,U.S.Radar,TimeDomain&Zircon,appliedforwaiverstomarketGroundPenetrationRadars,ShortRangeCommun

4、ication&DetectionDevices&DevicestoDetectObjectsWithinWallsatConstructionSites.September98–FCCissuedanInquirytoinvestigatewhethertoauthorizeUWBdevicesonunlicensedbasis(prohibitinginterferencetolicensedservices&operationincertain“restricted”bands).WidebandwidthisintrinsictoUWBoperation.Existingunl

5、icensedauthorizationproceduresweredevelopedfornarrowbandsystems.June99–FCCgrantedwaiverstoU.S.Radar,TimeDomain,&ZirconwithNTIAconcurrence,underconditionsofcoordinationofoperations,limiteddistribution&maintenanceofsalesrecords.BACKGROUND(Cont.)May00–FCCProposedRulesForComment-Regulatory-EmissionL

6、imits-UWBDefinition-MeasurementProcedures-FrequencyBands-ProhibitionAgainstClassBofOperationDampedWaveEmissions-FurtherTesting&-OtherMattersEvaluationJune00–NTIABeganNon-GPSMeasurementsandAnalysisTaskAtWashington&Boulder.August00–NTIABeganGPSMeasurementsandAnalysisTasksAtWashington&Boulder.BACKG

7、ROUND(Cont.)January01–NTIANon-GPSMeasurements&AnalysisReport…SenttoFCCaspartofrulemakingrecordforpubliccomment.March01–Measurements&AnalysisSenttotheFCCaspartofrulemakingrecordforpubliccommentby:NTIA–GPS(FundedpartiallybyDoT