Modeling of Cross Polarization Tracking Errors of Radome - Enclosed Monopulse Systems

Technical Report: DRDC Ottawa TR 2003-153. — Defence Research and Development Canada, 2003. — 128 pA cross-polarized signal transmitted by a jammer passes through a protective radome before reaching the aperture of a
missile antenna. As a result, the actual co-polar and cross-polar tracking response of the monopulse system changes
and varies with the relative antenna-pointing angle. This study describes a systematic EM procedure for the prediction
of the co-polar and cross-polar radiation patterns of radome-enclosed antennas. Both the measured and predicted
results show that the presence of a radome significantly affects the susceptibility of a monopulse tracking system to the
cross-polar jamming. In fact, the effectiveness of the cross-polar jamming depends on various factors such as the
incidence angle, polarization angle, the shape and material of the radome, and the type of the antenna. Results of this
study show that the cross-polar jamming in general does not have 100% of coverage angles. It is effective only in
certain incidence angles and when the polarization angle is less than 30 deg. In some incidence angles, cross-polar
jamming is deemed to be effectiveAbstract
Executive summaryComputational electromagnetics of pyramidal horns
Radome modeling
Monopulse analysis
DiscussionAnnex A: Measured radiation patterns
Annex B: Comparison of squint-beam patterns