Publications

BIRD, TS 1990, 'ANALYSIS OF MUTUAL COUPLING IN FINITE ARRAYS OF DIFFERENT-SIZED RECTANGULAR WAVE-GUIDES', IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, vol. 38, no. 2, pp. 166-172.
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BIRD, TS 1990, 'BEHAVIOR OF MULTIPLE ELLIPTIC WAVE-GUIDES OPENING INTO A GROUND PLANE', IEE PROCEEDINGS-H MICROWAVES ANTENNAS AND PROPAGATION, vol. 137, no. 2, pp. 121-126.
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BIRD, TS & HAY, SG 1990, 'MISMATCH IN DIELECTRIC-LOADED RECTANGULAR WAVE-GUIDE ANTENNA', ELECTRONICS LETTERS, vol. 26, no. 1, pp. 59-61.
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BIRD, TS & SPREY, MA 1990, 'SCAN LIMITATIONS OF SHAPED DUAL-OFFSET REFLECTOR ANTENNAS FOR MULTIPLE SATELLITE ACCESS', ELECTRONICS LETTERS, vol. 26, no. 4, pp. 228-230.
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CANDY, JV, ZIOLKOWSKI, RW & LEWIS, DK 1990, 'TRANSIENT WAVE ESTIMATION - A MULTICHANNEL DECONVOLUTION APPLICATION', JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, vol. 88, no. 5, pp. 2235-2247.
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CANDY, JV, ZIOLKOWSKI, RW & LEWIS, DK 1990, 'TRANSIENT WAVES - RECONSTRUCTION AND PROCESSING', JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, vol. 88, no. 5, pp. 2248-2258.
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DAJANI, I, DIPESO, G, MORSE, EC & ZIOLKOWSKI, R 1990, 'GAUSSIAN-BEAM PROPAGATION IN A WEAKLY NONLINEAR MEDIUM - A GEOMETRICAL-OPTICS APPROACH', PHYSICAL REVIEW A, vol. 41, no. 7, pp. 3740-3745.
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MADSEN, NK & ZIOLKOWSKI, RW 1990, 'A 3-DIMENSIONAL MODIFIED FINITE VOLUME TECHNIQUE FOR MAXWELL EQUATIONS', ELECTROMAGNETICS, vol. 10, no. 1-2, pp. 147-161.
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SHAARAWI, AM, BESIERIS, IM & ZIOLKOWSKI, RW 1990, 'A NOVEL-APPROACH TO THE SYNTHESIS OF NONDISPERSIVE WAVE PACKET SOLUTIONS TO THE KLEIN-GORDON AND DIRAC EQUATIONS', JOURNAL OF MATHEMATICAL PHYSICS, vol. 31, no. 10, pp. 2511-2519.
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Veitch, D & Glendinning, P 1990, 'Explicit renormalisation in piecewise linear bimodal maps', Physica D: Nonlinear Phenomena, vol. 44, pp. 149-167.

Veitch, D, Asten, MW & Van Leeuwen, EH 1990, 'Electrical and magnetometric fields in a layered earth containing buried electrodes', Geophysics, vol. 55, pp. 1605-1612.

ZIOLKOWSKI, RW & LEWIS, DK 1990, 'VERIFICATION OF THE LOCALIZED-WAVE TRANSMISSION EFFECT', JOURNAL OF APPLIED PHYSICS, vol. 68, no. 12, pp. 6083-6086.
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Horwitz, R, Courtenay, TD & Braun, RM 1990, 'The development of novel modem structures to enhance the throughput of dial up telephone lines', IEEE 1990 South African Symposium on Communications and Signal Processing, COMSIG 1990 - Proceedings, pp. 95-99.
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© 1990 IEEE. A popular approach to designing high-speed modems for use on voice-grade telephone channels is to use a high order modulation scheme combined with a digital architecture. This paper describes the development of a modem structure which uses the DSP56001 signal processor to implement 49 quadrature partial response signalling (49 QPRS). The choice of 49 QPRS is justified by its high spectral efficiency and reasonable error rate performance. This system is being developed for two applications, which are described in the paper.

Huang, XJ & Chen, HB 1990, 'Born migration and its fast implementation in the wavenumber-time domain', 1990 SEG Annual Meeting, pp. 1136-1139.
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© 1990 Society of Exploration Geophysicists. All rights reserved. A new method for wave equation migration is presented in this paper. This migration method, named Born Migration, is formulated by solving the boundary-value problem of the wave equation in an integral closed-form and applying the Born approximation for the Green's function in the inhomogeneous media. The major features of Born migration are: 1. it has no limitation in dip angle; 2. it can accommodate gentle vertical and lateral velocity variations; and 3. it can be implemented by using fast Fourier transformation. It is believed that this technique is especially suitable for migration in 3D seismic survey application.

Poulton, GT, Bird, TS, Hay, SG & Choi, YK 1990, 'Rigorous design of an antenna for AUSSAT-B', IEEE Antennas and Propagation Society, AP-S International Symposium (Digest), pp. 1900-1903.
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The prototype antenna designed, constructed, and tested for the AUSSAT-B western Australia regional beam has operated within specifications in all regards. More importantly, the overall design approach of using highly accurate software tools to obtain a successful first-time design has been vindicated. The antenna, comprising an array of horns illuminating an offset paraboloidal reflector, has a beamforming network (BFN) to provide correct power distribution and phasing to the feed elements. The antenna geometry is defined, showing the specified racetrack projected aperture. The other main constraint imposed on the antenna design was a volumetric limit on the feed and beamforming network. The far-field pattern obtained at 12.5 GHz is shown, with the beam pattern computed from measured BFN excitations superimposed. It is shown that the correspondence between theory and experiment is excellent.

Veitch, DN 1990, 'Bimodal maps, constrained flows, and resonance.'.