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Sru Tzm 11·1\) 4-6 January 1989 Sru TZm 11·1\) 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 4-6 January 1989 Sponsored by USNC/URSI in cooperation with Institute of Electrical and Electronics Engineers University of Colorado Boulder, Colorado U.S.A. Nationa1 Radio Science Meeting 4-6 January 1989 Condensed Technica1 Program Tuesday, 3 January 2000-2400 USNC-URSI Meeting Broker Inn Wednesday, 4 January 0835-1200 B-1 SCATTERING I CRO-30 0855-1200 D-1 HIGH FREQUENCY DEVICES CRO-36 F-1 EARTH AND OCEAN SENSING, AND TERRAIN EFFECTS CRl-9 G-1 THE EARLY DAYS OF RADIOSCIENCE CR2-28 A Commission G Memorial honoring the memory and celebrating the lives of Henry G. Booker, J.A. Ratcliffe, and Newbern Smith J-1 VERY LONG BASELINE INTERFEROMETRY AND ASTRONOMY I CR2-26 1335-1700 B-2 NUMERICAL METHODS CRO-30 DB-1 MICROWAVE COMPONENTS CRO-36 G-2 IONOSPHERIC EFFECTS ON RADAR AND SATELLITE SYSTEMS CR2-6 1355-1535 J-2 VERY LONG BASELINE INTERFEROMETRY AND ASTROMETRY II CR2-26 1355-1520 H-1 SPACEBORNE ELECTRODYNAMIC TETHERS AND THEIR EM EMISSIONS INTO NEAR-EARTH PLASMA CRl-46 1355-1700 A-1 ANTENNA AND FIELD MEASUREMENTS CRl-42 C-1 ANALYSIS OF UNEQUALLY SAMPLED EXPERIMENTAL DATA CRl-40 F-2 RAIN, RADIOMETRY, AND RADAR MEASUREMENTS CRl-9 1535-1700 J-3 INTERSTELLAR AND INTERPLANETARY SCATTERING CR2-26 1555-1700 H-2 ACTIVE EXPERIMENTS WITH ELECTRON AND NEUTRAL BEAM INJECTION INTO SPACE CRl-46 1700-1800 Commission B Business Meeting CRO-30 Commission C Business Meeting CRl-40 Commission G Business Meeting CR2-6 Commission J Business Meeting CR.2-26 United States National Committee INTERNATIONAL UNION OF RADIO SCIENCE PROGRAM AND ABSTRACTS National Radio Science Meeting 4-6 January 1989 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 G ~ ~ Cf7 qg It /J f--/J1 II f[ /2-0 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 1976-1989 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. A. Richard Thompson IEEE Antennas & Propagation Society Dr. W. Ross Stone IEEE Microwave Theory and Techniques Society Dr. A. A. Oliner IEEE Geophysics and Remote Sensing Society Dr. Robert E. McIntosh Members-at-Large: Dr. Julius Goldhirsh Dr. James W. Mink Dr. Kenneth Davies Dr. Charles Rino Dr. Irene Peden Dr. Dave Hill 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. John R. Herman Commission F Dr. Calvin T. Swift Commission G Dr. Charles M. Rush Commission H Dr. Mario Grossi Commission J Dr. J. Richard Fisher iii Officers of URSI resident in the United States: (including Honorary Presidents) Honorary President Prof. Henry G. Booker** 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 * Member of USNC/URSI Executive Committee ** Deceased, 1 November 1988 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 URSI (from its F-rench 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 ICSU 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. v 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 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. URSI 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 K. Davies E.K. Miller R.S. Elliott C.M. Rush J.R. Fisher L.L. Scharf M.D. Grossi E.K. Smith J.R. Herman E. Soderberg T. Itoh C.T. Swift M. Kanda A.D. Wyner vi - -------------- Wednesday Morning, 4 January, 0855-1200 Session B-1 0835-Weds. CRO-30 SCATTERING I Chairman: Gary Brown, Virginia Polytechnic and State Univ., Blacksburg, VA 24061 Bl-l Approximation Methods for Scattering 0840 From Rough Surfaces John A. DeSanto Center for Wave Phenomena Department of Mathematics Colorado School of Mines Golden, Colorado 80401 Rigorous analytical methods in rough surface scattering lead to integral equations. In coordinate space these integral equations are written on the surface value of the field (Neumann, hard, TM boundary value problem), the surface value of the normal derivative of the field (Dirichlet, Soft, TE) or coupled equations on both (interface or penetrable surface or dielectric problem). An additional integration is necessary to fmd the scattered or transmitted field. In Fourier transform space the corresponding equations are on the scattering and/or transmission amplitudes with a direct interpretation as scattered or transmitted fields as a function of angle. The integral equations express the full multiple scattering solution and this must be treated numerically. Truncation of the equtions can lead to analytical results for single scattering (which
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