NATIONAL ACADEMIES OF SCIENCE AND ENGINEERING NATIONAL RESEARCH COUNCIL of the UNITED STATES OF AMERICA UNITED STATES NATIONAL COMMITTEE International Union of Radio Science National Radio Science Meeting 3-5 January 1990 Sponsored by USNC/URSI in cooperation with Institute of Electrical and Electronics Engineers University of Colorado Boulder, Colorado U.S.A. National Radio Science Meeting 3-5 January 1990 Condensed Technical Program TUESDAY, 2 JANUARY 2000-2400 USNC-URSI Meeting Broker Inn WEDNESDAY, 3 JANUARY 0855-1200 AE-1 EMI MEASUREMENTS CRl-42 B-1 EM THEORY I CR2-28 B-2 RANDOM AND ROUGH SURFACES CRl-46 D-1 HIGH FREQUENCY AND HIGH SPEED INTEGRATED CIRCUITS CRl-40 F-1 RADAR BACKSCATTER, ATTENUATION, AND DROPSIZE DISTRIBUTIONS CRl-9 G-1 IONOSPHERIC MODELING CR2-6 H-1 RADIO EMISSIONS CR0-30 J-1 CENTIMETER-WAVE RADIO ASTRONOMY CR2-26 1335-1700 G-2 CEDAR TECHNIQUES CR2-6 H-2 COMMON AND UNCOMMON WAVE PHENOMENA IN SPACE AND IONOSPHERIC PLASMAS CR0-30 J-1 CENTIMETER-WAVE RADIO ASTRONOMY CR2-26 1355-1540 F-2 TROPOSPHERIC WIND, WAVES, AND ATTENUATION CRl-46 1355-1700 A-1 ANTENNAS AND FIELDS MEASUREMENTS CRl-42 B-3 SCATTERING CR2-28 E-1 HIGH POWER ELECTROMAGNETICS IV CRl-9 1415-1700 D-2 ADVANCED DEVICES CRl-40 1600-1700 F-3 OCEAN AND TERRAIN EFFECTS CRl-46 1700-1800 Commission A Business Meeting CRl-42 Commission D Business Meeting CRl-40 Commission E Business Meeting CRl-9 Commission F Business Meeting qn-46 Commission H Business Meeting CR0-30 Commission J Business Meeting CR2-26 THURSDAY, 4 JANUARY 0830-1200 PLENARY SESSION Muenzinger Psychology EOSO (Auditorium) 1335-1440 J-2 GENERAL SESSION: SOLAR RADIO ASTRONOMY DURING MAX 91 CR2-26 United States National Committee INTERNATIONAL UNION OF RADIO SCIENCE PROGRAM AND ABSTRACTS National Radio Science Meeting 3-5 January 1990 Sponsored by USNC/URSI in cooperation with IEEE groups and societies: Antennas and Propagation Circuits and Systems Communications Electromagnetic Compatibility Geoscience Electronics Information Theory Instrumentation and Measurement Microwave Theory and Techniques Nuclear and Plasma Sciences Quantum Electronics and Applications 7o (4t.-vJ !3 (:, ---nl/,·30. s:;, ~ s-1. ,AJ~ {/'t q9 }'f 'JG C c),'1,1. F 'Y-vt ~ rt&,J;\.$1/'~ lt/,'L5 z G~ fZ t C Crlf.l.,,.,,J vc.., G, IJ!/lu,a.";2t!?t_-tt/lA"~ Programs and Abstracts of the USNC/URSI Meetings are available from: USNC/URSI National Academy of Sciences 2101 Constitution Avenue, N.W. Washington, DC 20418 at $2 for meetings prior to 1970, $3 for 1971-1975, and $5 for 1976-1990 meetings. The full papers are not published in any collected format; requests for them should be addressed to the authors who may have them published on their own initiative. Please note that these meetings are national. They are not organized by the International Union, nor are the programs available from the International Secretariat. ii MEMBERSHIP United States National Committee INTERNATIONAL UNION OF RADIO SCIENCE Chairman: Sidney A. Bowhill* Vice Chairman: Chalmers M. Butler* Secretary: David C. Chang* Immediate Past Chairman: Robert K. Crane* Members Representing Societies, Groups, and Institutes: American Geophysical Union Dr. George W. Reed American Astronomical Society Dr. William J. Welch IEEE Antennas & Propagation Society Dr. W. Ross Stone IEEE Microwave Theory and Techniques Society Dr. A. A. Oliner American Meterological Society Dr .. Richard Hahlgren Members-at-Large: Dr. Julius Goldhirsh Dr. James W. Mink Dr. Kenneth Davies(9oJ Dr. Lewis Duncan Dr. Irene Peden(~) Dr. David J. Thompson Dr Gary Bzown ('M) Liaison Representatives from Government Agencies: National Telecommunications & Information Administration Dr. Hans Liebe National Science Foundation Dr. Laura P. Bautz Federal Communications Commission Mr. William A. Daniel Department of Defense Mr. William J. Cook Department of the Army Mr. Earl J. Holliman Department of the Air Force Dr. Allan C. Schell Chairmen of the USNC/URSI Commissions: Commission A Dr. Edmund K. Miller Commission B Dr. Robert S. Elliott Commission C Dr. Aaron D. Wyner Commission D Dr. Tatsuo Itoh Commission E Dr. Emil Soderberg (acting chair) Commission F Dr. Calvin T. Swift I/ l ; i-lOAA9 <2i'c i,te,.. Commission G Dr. Charles M. Rush irJ~ Vl!w/J4,r,s1- Commission H Dr. Mario Grossi Commission J Dr. J. Richard Fisher * Member of USNC/URSI Executive Committee iii Chairmen and Vice Chairmen of Commissions of URSI resident in the United States: Chairman of Commission B Prof. Thomas B.A. Senior Chairman of Commission F Dr. Robert K. Crane Foreign Secretary of the U.S. National Academy of Sciences Dr. William E. Gordon Chairman, National Research Council, Commission on Physical Sciences, Mathematics, and Resources Dr. Norman Hackerman Chairman, National Research Council, Board on Physics and Astronomy Prof. Norman F. Ramsey Honorary Members Dr. Harold H. Beverage Dr. Ernst Weber NRC Staff Director Mr. Donald C. Shapero NRC Program Officer Dr. Robert L. Riemer NRC Administrative Associate Ms. Susan M. Wyatt iv DESCRIPTION OF THE INTERNATIONAL UNION OF RADIO SCIENCE The International Union of Radio Science is one of 18 world scientific unions organized under the International Council of Scientific Unions (ICSU). It is commonly designated as URS! (from its French name,. Union Radio Scientifique Internationale). Its aims are (1) to promote the scientific study of radio communications, (2) to aid and organize radio research requiring cooperation on an international scale and to encourage the discussion and publication of the results, (3) to facilitate agreement upon common methods of measurement and the standardization of measuring instruments, and (4) to stimulate and to coordinate studies of the scientific aspects of telecommunications using electromagnetic waves, guided and unguided. The International Union itself is an organizational framework to aid in promoting these objectives. The actual technical work is largely done by the National Committee in the various countries. The officers of the International Union are: President: Prof. A.L. Cullen (U.K.) Past President: Dr. A.P. Mitra (India) Vice Presidents: Dr. Ing. H.J. Albrecht (F.R.G.) R.L. Dowden (New Zealand) E.D. Jull (Canada) Prof. V. Zima (Czechoslovakia) Secretary-General J. Van Bladel (Belgium) Honorary Presidents: G. Beynon (U.K.) W. Dieminger (West Germany) W. Christiansen (Australia) The Secretary-General's office and the headquarters of the organization are located at Avenue Albert Lancaster, 32, B-1180 Brussels, Belgium. The Union is supported by contributions (dues) from 38 member countries. Additional funds for symposia and other scientific activities of the Union are provided by !CSU from contributions received for this purpose from UNESCO. The International Union, as of the XXth General Assembly held in Washington, DC in August 1981, has nine bodies called Commissions for centralizing studies in the principal technical fields. Every three years the International Union holds a meeting called the General Assembly. The next is the XXIIIrd, to be held in 1990. The Secretariat prepares and distributes the Proceedings of the General Assemblies. The V International Union arranges international symposia on specific subjects pertaining to the work of one or several Commissions and also cooperates with other Unions in international symposia on subjects of joint interest. Radio is unique among the fields of scientific work in having a specific adaptability to large-scale international research programs, since many of the phenomena that must be studied are worldwide in extent and yet are in a measure subject to control by experimenters. Exploration of space and the extension of scientific observations to the space environment are dependent on radio for their research. One branch, radio astronomy, involves cosmic phenomena. URS! thus has a distinct field of usefulness in furnishing a meeting ground for the numerous workers in the manifold aspects of radio research; its meetings and committee activities furnish valuable means of promoting research through exchange of ideas. Steering Committee: S.W. Maley, Chairman (303) 492-7004 D.C. Chang D.S. Cook P.L. Jensen M.G. Kindgren Technical Program Committee: D.C. Chang, Chairman S.W. Maley R.S. Elliott C.M. Rush L. Fedor L.L. Scharf J.R. Fisher E.K. Smith M.D. Grossi E. Soderberg T. Itoh C.T. Swift M. Kanda D.J. Thompson vi Wednesday Morning, 3 January, 0855-1200 Session AE-1 0855-Weds. CRl-42 EMI MEASUREMENTS Chairman: J.W. Adams, Electromagnetic Fields Division, National Institute of Standards and Technology, Boulder, CO 80303 AEl-1 IARGE-SYSTEM EMC TESTING USING TIME-DOMAIN 0900 TECHNIQUES J.W. Adams, A.R. Ondrejka, K.H. Cavcey, J.E. Cruz Electromagnetic Fields Division National Institute of Standards and Technology Boulder, CO 80303 Improved techniques for determining critical resonant frequencies and the current response of internal wiring due to external fields for large structures (whole systems) are discussed. The measurement method is based on using a periodic sequence of low-level, radiated impulses. Their level is so low that they do not disturb other spectrum users. A fiber­ optic trigger system permits coherent detection of these test impulses and rejection of other signals. Therefore other spectrum users do not significantly disturb these measurements. The field-strength levels are low, a distinct advantage from both cost and personnel hazard standpoints. There are several problems that must be addressed before the full potential of this technique can be realized. One of these is to establish an upper bound of induced current that will not be exceeded for any orientation between a radiating source and test object. Another is to establish conditions for which bulk current injection is valid in order to allow conducted electromagnetic susceptibility testing that is equivalent to radiated susceptibility testing. .. 1 AE-1 We-AM AEl-2 TRANSIENT WAVEFORM MEASUREMENT EXTRAPOLATION ISSUES 0920 M.A. Dinallo BDM International 1801 Randolph Road, SE Albuquerque, New Mexico 87106 Recent measurements of surface currents on the EMP Test Aircraft (EMPTAC) at the TRESTLE and HPD simulation facilities have been analyzed and extrapolated (forthcoming as an AFSC/WL-BDM Technical report).