Crane construction:
Skelleton type construction of wire
type elements
Horizontal jib and elevating steel
ropes are copolarized with the ILS signal
Horizontal dimension of the vertical
supporting structure is smaller than a wavelength
Numerical Analysis/Solution:
Solution possible only by the integral
equation method (moment method MoM))
Bistatic scattering pattern is azimuthally
directive if effectively illuminated
(see graph as an example)
Illumination by the ILS-antenna
above ground
Hybrid solution with GTD/UTD superpositions
Mutual coupling with assembled cranes
Integration of the partial MoM-solution
into the system analysis (DDM)
Results:
Systematic simulations performed
for single cranes and multi-crane assemblies
(see
graph as an example)
Requires adaption to the given site
(relative positions, dimensions, rotation)
Large/long and high cranes are a
real threat for CATIII ILS
Receiver filtering has to be considered
Threat and the acceptability for
the ILS can be determined in advance
Determination of threatening jib-positions
A temporary decategorisation can
be avoided for CATIII ILS in case
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