Publications

Bird, TS 1990, 'Analysis of mutual coupling in finite arrays of different-sized rectangular waveguides', IEEE Transactions on Antennas and Propagation, vol. 38, no. 2, pp. 166-172.
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Bird, TS & Hay, SG 1990, 'Mismatch in dielectric-loaded rectangular waveguide 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. 228-228.
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Veitch, D & Glendinning, P 1990, 'Explicit renormalisation in piecewise linear bimodal maps', Physica D: Nonlinear Phenomena, vol. 44, no. 1-2, pp. 149-167.
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Horwitz, R, Courtenay, TD & Braun, RM 1970, 'The Development Of Novel Modem Structures To Enhance The Throughput Of Dial Up Telephone Lines', IEEE South African Symposium on Communications and Signal Processing, IEEE South African Symposium on Communications and Signal Processing, IEEE, 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, X & Chen, H 1970, 'Born migration and its fast implementation in the wavenumber‐time domain', SEG Technical Program Expanded Abstracts 1990, SEG Technical Program Expanded Abstracts 1990, Society of Exploration Geophysicists, 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.