Case | Feedhorns | PR | SR | Alignmenta |
Nominal | LFI: as-builtb | Photogrammetric | Interferometric | As-built |
HFI: as-builtc | ||||
Best | LFI: as-built | Perfect Ellipsoid | Interferometric | Best |
HFI: as-built | ||||
Worst | LFI: as-built | Photogrammetric + Syntheticd | Interferometric | Worst () |
HFI: measurede |
Notes. (a) The selection of the alignment cases is described in Sect. 6.1.
(b) Based on an electromagnetic model of the
as-built geometry, whose RF properties have been correlated against
measurements, and which has been corrected for cool-down effects
(Sandri et al. 2010).
(c) Based on an electromagnetic model of the as-built geometry (Maffei et al. 2010); cool down effects have a negligible impact.
(d) A set of small-scale spatial deformations was synthesized similar to those measured on the SR by interferometry.
(e) In some cases the feedhorn patterns were
significantly different from the predicted ones; for these cases a
hybrid pattern was developed which accounted for the measurements
(Maffei et al. 2010).
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