射频干扰浴相关测量和测试结果总结

Frank H. SandersBradley J. RamseyRobert L. Hinkle Institute for Telecommunication SciencesandOffice of Spectrum Management National Telecommunications and InformationAdministrationU.S. Department of Commerce September 17, 1997 PREFACE Certaincommercial equipment and software are identified in thisreportto adequately describe the measurements.Inno case doessuchidentification imply recommendation or endorsement by theNationalTelecommunications and Information Administration,nordoesit imply that the equipment or software identified arenecessarily the best available for the application. The measurements and tests described in this Technical Memorandumrequiredthe dedicated efforts of a large group of people.Inaddition to the authors, the Bath Test Team consisted of personnelfrom the U.S. Navy, the Illinois Institute of Technology ResearchInstitute(IITRI),and Lockheed Martin.LieutenantCommanderArthur Harris, AEGIS Test Officer, SUPSHIPS Bath, provided us withall support and access necessary to accomplish the measurements atthe shipyard.Mr. Len Lieb of IITRI assisted in the preparation ofthe test plan, and was a key figure in the measurements, tests, andon-siteanalysis of results.Mr.Scott Freiberger(LockheedMartin) of the AEGIS Test Team (ATT) provided guidance during themeasurements, tests, and analysis, and also supported the Test Teamwith office facilities during the tasks at the shipyard.Mr. DavidMurray of Lockheed Martin provided critical guidance and evaluationforthe team during and after the measurements and tests at thesite.Mr.Michael Kelley of TRACOR(in support of PMS-400)alsoprovidedcritical coordination among the ATT members before,during, and after the work at Bath. CONTENTS Page PREFACE .....................................................iiiACKNOWLEDGMENTS.............................................vFIGURES .....................................................viiiABSTRACT ....................................................11.INTRODUCTIO N1.1Background..........................................11.2Authority...........................................21.3Major Objective.....................................21.4Approach2.MEASUREMENTS AND TESTS...................................32.1Introduction........................................32.2Objective 1.........................................42.3Objective 2.........................................72.4Objective 3.........................................82.5Objective 4.........................................103.CONCLUSIONS4.TECHNICAL INTERFERENCE MITIGATION OPTIONS................155.REFERENCES FIGURES PageFigure 1. SatelliteG6(V)transponders measured at receiver(IF)input, radar off............................................20Figure 2. Earth station antenna pivoted away from satellite; LNB noise only; radaFigure 3. Earth station antenna w. 50-ohm load replacing feed; radarcoupling.................................................22Figure 4. Earth station antenna w. 50-ohm load, no bandpass filter,radar coupling..............................................23Figure 5. RadaremissionsatLNBoutputwhenantennafeedreconnected.................................................24Figure 6. LNB noise floor with transponder signals vs. noise floor with LNB termiFigure 7. Receiver worst-case APD; radar = high power, pier 3, bands8-10.................................................26Figure 8. Rec eiverinterference threshold APD;radar=low power,pier 3, band 8-10...........................................27Figure 9. ................APDs for 150-255 degrees on rooftop28Figure 10. APDsfor line-of-sight of earth station antennas,fromrooftop.................................................29Figure 11.APD for direction to shipyard cranes, from rooftop30Figure 12..........................APDs in north parking lot31Figure 13.............APDs in NW corner of north parking lot32Figure 14.........................APDs for south parking lot33Figure 15. APDs for satellite line-of-sight axes from southparkinglot.................................................34Figure 16. Radar emission spectrum measured in south parking lot35Figure 17. Antennapattern,AFCantennas(CH10)comparedtoparabolic dish antenna......................................36 SUMMARYOF RESULTS OF MEASUREMENTS AND TESTS RELATED TO RFINTERFERENCEAT BATH,MAINE Frank H. Sanders, Bradley J. Ramsey, and Robert L. Hinkle TheNationalTelecommunicationsandInformationAdministration(NTIA)is responsible for managing theFederalGovernment's use of the radiospectrum.Indischargingthis responsibility,NTIA uses a variety ofspectrummeasurement system to collect data for spectrummanagementsupport.Suchspectrum management support caninvolvetechnical analysis of radio interference thatinvolvesFederalGovernmentradiosystems.SuchaninterferencesituationhasoccurredatBath,Maine,involving the U.S. Navy and a private-sector earth stationoperator.This report details a data collection effortdirected at determining the mechanism of interference to