3D conformal antennas for radar applications

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dc.contributor.advisor Balleri, Alessio
dc.contributor.author Fourtinon, L
dc.date.accessioned 2018-07-26T15:15:58Z
dc.date.available 2018-07-26T15:15:58Z
dc.date.issued 2018
dc.identifier.uri http://dspace.lib.cranfield.ac.uk/handle/1826/13359
dc.description.abstract Embedded below the radome of a missile, existing RF-seekers use a mechanical rotating antenna to steer the radiating beam in the direction of a target. Latest research is looking at replacing the mechanical antenna components of the RF seeker with a novel 3D conformal antenna array that can steer the beam electronically. 3D antennas may oer signicant advantages, such as faster beamsteering and better coverage but, at the same time, introduce new challenges resulting from a much more complex radiation pattern than that of 2D antennas. Thanks to the mechanical system removal, the new RF-seeker has a wider available space for the design of a new 3D conformal antenna. To take best benets of this space, dierent array shapes are studied, hence the impact of the position, orientation and conformation of the elements is assessed on the antenna performance in terms of directivity, ellipticity and polarisation. To facilitate this study of 3D conformal arrays, a Matlab program has been developed to compute the polarisation pattern of a given array in all directions. One of the task of the RF-seeker consists in estimating the position of a given target to correct the missile trajectory accordingly. Thus, the impact of the array shape on the error between the measured direction of arrival of the target echo and its true value is addressed. The Cramer-Rao lower bound is used to evaluate the theoretical minimum error. The model assumes that each element receives independently and allows therefore to analyse the potential of active 3D conformal arrays. Finally, the phase monopulse estimator is studied for 3D conformal arrays whose quadrants do not have the same characteristics. A new estimator more adapted to non-identical quadrants is also proposed. en_UK
dc.language.iso en en_UK
dc.rights © Cranfield University, 2018. All rights reserved. No part of this publication may be reproduced without the written permission of the copyright holder.
dc.subject Conformal en_UK
dc.subject Phased arrays en_UK
dc.subject Ellipticity en_UK
dc.title 3D conformal antennas for radar applications en_UK
dc.type Thesis en_UK

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